Abdul Khayum Mohammed

@cusat.ac.in

Postdoc
Cochin University of Science and Technology

https://researchid.co/abdulkhayummohammed

EDUCATION

Ph D in Chemical Science, CSIR-NCL Pune, India, 2019

M Sc Applied Chemistry, CUSAT, Cochin, India, 2014

B Sc Chemistry, St Thomas' College, Trichur, India, 2012.

RESEARCH, TEACHING, or OTHER INTERESTS

Materials Science, Renewable Energy, Sustainability and the Environment

Scopus Publications

2192

Scholar Citations

Scholar h-index

Scholar i10-index

Scopus Publications

Modulating Core Polarity in Metal-free Covalent Organic Frameworks for Selective Electrocatalytic Hydrogen Peroxide Production
Shivangi Mehta, Nada Elmerhi, Sukhjot Kaur, Abdul Khayum Mohammed, Tharamani C. Nagaiah, and Dinesh Shetty
Wiley
AbstractTuning the charge density at the active site to balance the adsorption ability and reactivity of oxygen is extremely significant for driving a two‐electron oxygen reduction reaction (ORR) to produce hydrogen peroxide (H2O2). Herein, we have highlighted the influence of intermolecular polarity in covalent organic frameworks (COFs) on the efficiency and selectivity of electrochemical H2O2 production. Different C3 symmetric building blocks have been utilized to regulate the charge density at the active sites. The benzene‐cored COF, which exhibits reduced polarity than the triazine‐cored COF, displayed enhanced performance in H2O2 production, achieving 93.1 % selectivity for H2O2 at 0.4 V with almost two‐electron transfer and a faradaic efficiency of 90.5 %. In‐situ electrochemical Raman spectroscopy and scanning electrochemical microscopy (SECM) were employed to confirm H2O2 generation and analyze spatial reactivity patterns. These techniques provided detailed insights into localized catalytic behavior, emphasizing the influence of core polarity.

Energy Efficient Memristor Based on Green-Synthesized 2D Carbonyl-Decorated Organic Polymer and Application in Image Denoising and Edge Detection: Toward Sustainable AI
Pratibha Pal, Hanrui Li, Ruba Al‐Ajeil, Abdul Khayum Mohammed, Ayman Rezk, Georgian Melinte, Ammar Nayfeh, Dinesh Shetty, and Nazek El‐Atab
Wiley
AbstractAccording to the United Nations, around 53 million metric tons of electronic waste is produced every year, worldwide, the big majority of which goes unprocessed. With the rapid advances in AI technologies and adoption of smart gadgets, the demand for powerful logic and memory chips is expected to boom. Therefore, the development of green electronics is crucial to minimizing the impact of the alarmingly increasing e‐waste. Here, it is shown the application of a green synthesized, chemically stable, carbonyl‐decorated 2D organic, and biocompatible polymer as an active layer in a memristor device, sandwiched between potentially fully recyclable electrodes. The 2D polymer's ultramicro channels, decorated with C═O and O─H groups, efficiently promote the formation of copper nanofilaments. As a result, the device shows excellent bipolar resistive switching behavior with the potential to mimic synaptic plasticity. A large resistive switching window (103), low SET/RESET voltage of ≈0.5/−1.5 V), excellent device‐to‐device stability and synaptic features are demonstrated. Leveraging the device's synaptic characteristics, its applications in image denoising and edge detection is examined. The results show a reduction in power consumption by a factor of 103 compared to a traditional Tesla P40 graphics processing unit, indicating great promise for future sustainable AI‐based applications.

MOFite: A High-Density Lithiophilic and Scalable Metal–Organic Framework Anode for Rechargeable Lithium-Ion Battery
Safa Gaber, Abdul Khayum Mohammed, Bharathkumar H. Javaregowda, José Ignacio Martínez, Pilar Pena Sánchez, Felipe Gándara, Kothandam Krishnamoorthy, and Dinesh Shetty
Wiley
AbstractDeveloping an anode material that has better performance efficiency than commercial graphite while keeping the features of economic scalability and environmental safety is highly desirable yet challenging. MOFs are a promising addition to the ongoing efforts, however, the relatively poor performance, chemical instability, and large‐scale economic production of efficiency‐proven pristine MOFs restrict their utility in real‐life energy storage applications. Furthermore, hierarchical porosity for lucid mass diffusion, high‐density lithiophilic sites are some of the structural parameters for improving the electrode performance. Herein, we have demonstrated the potential of economically scalable salicylaldehydate 3D‐conjugated‐MOF (Fe−Tp) as a high‐performance anode in Li‐ion batteries: the anode‐specific capacity achieved up to 1447 mAh g−1 at 0.1 A g−1 and 89 % of cyclic stability after 500 cycles at 1.0 A g−1 for pristine MOF. More importantly, incorporating 10 % Fe−Tp doping in commercial graphite (MOFite) significantly enhanced lithium storage, doubling capacity after 400 cycles. It signifies the potential practical utility of Fe−Tp as a performance booster for commercial anode material.

Iron salicylaldehydate conjugated metal–organic framework for quasi solid-state supercapacitor
Abdul Khayum Mohammed, Ajmal Pandikassala, Pilar Pena Sánchez, Safa Abdullah Gaber, Stefano Canossa, Maria Kurian, Gigi Xavier, Yao He, Felipe Gándara, Sreekumar Kurungot,et al.
Elsevier BV

A carbonyl-decorated two-dimensional polymer as a charge-trapping layer for non-volatile memory storage devices with a high endurance and wide memory window
Ruba Al-Ajeil, Abdul Khayum Mohammed, Pratibha Pal, Matthew A. Addicoat, Surabhi Suresh Nair, Dayanand Kumar, Abdul Momin Syed, Ayman Rezk, Nirpendra Singh, Ammar Nayfeh,et al.
Royal Society of Chemistry (RSC)
Novel carbonyl-decorated 2D-polymer synthesized via mechanomixing exhibits high-density packing of charge trapping sites and shows a wide memory window in a nonvolatile capacitive memory device.

An In situ Proton Filter Covalent Organic Framework Catalyst for Highly Efficient Aqueous Electrochemical Ammonia Production
Kayaramkodath C. Ranjeesh, Sukhjot Kaur, Abdul K. Mohammed, Safa Gaber, Divyani Gupta, Khaled Badawy, Mohamed Aslam, Nirpendra Singh, Tina Skorjanc, Matjaž Finšgar,et al.
Wiley
AbstractThe electrocatalytic nitrogen reduction reaction (NRR) driven by renewable electricity provides a green synthesis route for ammonia (NH3) production under ambient conditions but suffers from a low conversion yield and poor Faradaic efficiency (F.E.) because of strong competition from hydrogen evolution reaction (HER) and the poor solubility of N2 in aqueous systems. Herein, an in situ proton filter covalent organic framework catalyst (Ru‐Tta‐Dfp) is reported with inherent Ruthenium (Ru) sites where the framework controls reactant diffusion by suppressing proton supply and enhancing N2 flux, causing highly selective and efficient catalysis. The smart catalyst design results in a remarkable ammonia production yield rate of 2.03 mg h−1 mgcat−1 with an excellent F.E. of ≈52.9%. The findings are further endorsed with the help of molecular dynamics simulations and control COF systems without in situ proton filter feasibility. The results point to a paradigm shift in engineering high‐performance NRR electrocatalysts for more feasible green NH3 production.

Crystallizing covalent organic frameworks from metal organic framework through chemical induced-phase engineering
Abdul Khayum Mohammed, Safa Gaber, Jésus Raya, Tina Skorjanc, Nada Elmerhi, Sasi Stephen, Pilar Pena Sánchez, Felipe Gándara, Steven J. Hinder, Mark A. Baker,et al.
Springer Science and Business Media LLC
AbstractThe ordered porous frameworks like MOFs and COFs are generally constructed using the monomers through distinctive metal-coordinated and covalent linkages. Meanwhile, the inter-structural transition between each class of these porous materials is an under-explored research area. However, such altered frameworks are expected to have exciting features compared to their pristine versions. Herein, we have demonstrated a chemical-induction phase-engineering strategy to transform a two-dimensional conjugated Cu-based SA-MOF (Cu-Tp) into 2D-COFs (Cu-TpCOFs). The structural phase transition offered in-situ pore size engineering from 1.1 nm to 1.5–2.0 nm. Moreover, the Cu-TpCOFs showed uniform and low percentage-doped (~ 1–1.5%) metal distribution and improved crystallinity, porosity, and stability compared to the parent Cu-Tp MOF. The construction of a framework from another framework with new linkages opens interesting opportunities for phase-engineering.

Hypes and hopes on the materials development strategies to produce ammonia at mild conditions
Swati Singh, Abdul Khayum Mohammed, Ali Abdulkareem AlHammadi, Dinesh Shetty, and Kyriaki Polychronopoulou
Elsevier BV

Enzyme-immobilized hierarchically porous covalent organic framework biocomposite for catalytic degradation of broad-range emerging pollutants in water
Nada Elmerhi, Khadega Al-Maqdi, Khawlah Athamneh, Abdul Khayum Mohammed, Tina Skorjanc, Felipe Gándara, Jesus Raya, Simon Pascal, Olivier Siri, Ali Trabolsi,et al.
Elsevier BV

Chemically Gradient Hydrogen-Bonded Organic Framework Crystal Film
Abdul Khayum Mohammed, Jésus Raya, Ajmal Pandikassala, Matthew A. Addicoat, Safa Gaber, Mohamed Aslam, Liaqat Ali, Sreekumar Kurungot, and Dinesh Shetty
Wiley
AbstractHydrogen‐bonded organic frameworks (HOFs) are ordered supramolecular solid structures, however, nothing much explored as centimetre‐scale self‐standing films. The fabrication of such crystals comprising self‐supported films is challenging due to the limited flexibility and interaction of the crystals, and therefore studies on two‐dimensional macrostructures of HOFs are limited to external supports. Herein, we introduce a novel chemical gradient strategy to fabricate a crystal‐deposited HOF film on an in situ‐formed covalent organic polymer film (Tam‐Bdca‐CGHOF). The fabricated film showed versatility in chemical bonding along its thickness from covalent to hydrogen‐bonded network. The kinetic‐controlled Tam‐Bdca‐CGHOF showed enhanced proton conductivity (8.3×10−5 S cm−1) compared to its rapid kinetic analogue, Tam‐Bdca‐COP (2.1×10−5 S cm−1), which signifies the advantage of bonding‐engineering in the same system.

The fragmented 3D-covalent organic framework in cellulose acetate membrane for efficient phenol removal
Abdul Khayum Mohammed, Jisha Kuttiani Ali, Mahira Bashri Selman Kuzhimully, Matthew A. Addicoat, Sabu Varghese, Maria Baias, Emad Alhseinat, and Dinesh Shetty
Elsevier BV

Salicylaldehydate coordinated two-dimensional-conjugated metal-organic frameworks
Abdul Khayum Mohammed, Pilar Pena-Sánchez, Ajmal Pandikassala, Safa Gaber, Ayesha A. AlKhoori, Tina Skorjanc, Kyriaki Polychronopoulou, Sreekumar Kurungot, Felipe Gándara, and Dinesh Shetty
Royal Society of Chemistry (RSC)
We have demonstrated a facile, scalable, and green synthetic route to produce a novel class of semiconductive 2D-c-MOFs (SA-MOFs). This novel MOF chemistry opens rich opportunities for the exploration of functionally diverse open frameworks.

Covalent Organic Framework Based on Azacalix[4]arene for the Efficient Capture of Dialysis Waste Products
Tina Skorjanc, Dinesh Shetty, Felipe Gándara, Simon Pascal, Nawavi Naleem, Salma Abubakar, Liaqat Ali, Abdul Khayum Mohammed, Jesus Raya, Serdal Kirmizialtin,et al.
American Chemical Society (ACS)
Azacalix[n]arenes (ACAs) are lesser-known cousins of calix[n]arenes that contain amine bridges instead of methylene bridges, so they generally have higher flexibility due to enlarged cavities. Herein, we report a highly substituted cationic azacalix[4]arene-based covalent organic framework (ACA-COF) synthesized by the Zincke reaction under microwave irradiation. The current work is a rare example of a synthetic strategy that utilizes the chemical functionalization of an organic macrocycle to constrain its conformational flexibility and, thereby, produce an ordered material. Considering the ACA cavity dimensions, and the density and diversity of the polar groups in ACA-COF, we used it for adsorption of uric acid and creatinine, two major waste products generated during hemodialysis treatment in patients with renal failure. This type of application, which has the potential to save ∼400 L of water per patient per week, has only been recognized in the last decade, but could effectively address the problem of water scarcity in arid areas of the world. Rapid adsorption rates (up to k = 2191 g mg–1 min–1) were observed in our COF, exceeding reported values by several orders of magnitude.

Polythiacalixarene-Embedded Gold Nanoparticles for Visible-Light-Driven Photocatalytic CO<inf>2</inf>Reduction
Tina Skorjanc, Khaja Mohaideen Kamal, Ayesha Alkhoori, Gregor Mali, Abdul Khayum Mohammed, Zouhair Asfari, Kyriaki Polychronopoulou, Blaž Likozar, Ali Trabolsi, and Dinesh Shetty
American Chemical Society (ACS)
Metal nanoparticles are potent reaction catalysts, but they tend to aggregate, thereby limiting their catalytic efficiency. Their coordination with specific functional groups within a porous structure prevents their aggregation and facilitates the mass flow of catalytic starting materials and products. Herein, we use a thiacalix[4]arene-based polymer as a porous support with abundant docking sites for Au nanoparticles. The sulfur atoms bridging the phenolic subunits of thiacalix[4]arene serve as Lewis basic sites that coordinate Au atoms. Therefore, this approach takes advantage of the functional groups inherent in the monomer and avoids laborious postsynthetic modifications of the polymer. The presented system was tested for visible-light-driven photocatalytic CO2 reduction, where it showed adequate ability to generate 6.74 μmol g–1 CO over the course of 4 h, while producing small amounts of the CH4 product. This study aims to stimulate interest in the design and development of synthetically simpler porous polymer supports for various metal nanoparticles in catalytic and other applications.

Solvent-Influenced Fragmentations in Free-Standing Three-Dimensional Covalent Organic Framework Membranes for Hydrophobicity Switching
Abdul Khayum Mohammed, Ayesha A. Al Khoori, Matthew A. Addicoat, Sabu Varghese, Israa Othman, Maguy Abi Jaoude, Kyriaki Polychronopoulou, Maria Baias, Mohammad Abu Haija, and Dinesh Shetty
Wiley
AbstractThe ordered open organic frameworks membranes are attractive candidates for flow‐assisted molecular separations. The physicochemical properties of such membranes mostly depend on their selectively chosen functional building blocks. In this work, we have introduced a novel concept of functional switchability of three‐dimensional covalent organic framework (3D‐COF) membranes through a simple solvent‐influenced fragmentation method. This room‐temperature interfacial synthesis provides free‐standing 3D‐COF membranes with distinct physicochemical properties from the same building monomers. Notably, the change of solvent from chloroform to ethyl acetate switches the membrane property from hydrophilic (water contact angle 60°) to hydrophobic (water contact angle 142°) nature. The hydrophobic 3D‐COF membrane selectively passes oil molecules from an oil–water emulsion with a gravitational flux of 1536 L m−2 h−1.

Metallated Isoindigo-Porphyrin Covalent Organic Framework Photocatalyst with a Narrow Band Gap for Efficient CO<inf>2</inf>Conversion
Tina Skorjanc, Dinesh Shetty, Mahmoud Elcheikh Mahmoud, Felipe Gándara, Jose Ignacio Martinez, Abdul Khayum Mohammed, Sandra Boutros, Areej Merhi, Elissa O. Shehayeb, Christa A. Sharabati,et al.
American Chemical Society (ACS)
Photocatalytic CO2 reduction into formate (HCOO-) has been widely studied with semiconductor and molecule-based systems, but it is rarely investigated with covalent organic frameworks (COFs). Herein, we report a novel donor-acceptor COF named Co-PI-COF composed of isoindigo and metallated porphyrin subunits that exhibits high catalytic efficiency (∼50 μmol formate g-1 h-1) at low-power visible-light irradiation and in the absence of rare metal cocatalysts. Density functional theory calculations and experimental diffuse-reflectance measurements are used to explain the origin of catalytic efficiency and the particularly low band gap (0.56 eV) in this material. The mechanism of photocatalysis is also studied experimentally and is found to involve electron transfer from the sacrificial agent to the excited Co-PI-COF. The observed high-efficiency conversion could be ascribed to the enhanced CO2 adsorption on the coordinatively unsaturated cobalt centers, the narrow band gap, and the efficient transfer of the charge originating from the postsynthetic metallation. It is anticipated that this study will pave the way toward the design of new simple and efficient catalysts for photocatalytic CO2 reduction into useful products.

Erratum: Macroscopic covalent organic framework architectures for water remediation (Environmental Science: Water Research and Technology (2021) DOI: 10.1039/d1ew00408e)
Abdul Khayum Mohammed and Dinesh Shetty
Royal Society of Chemistry (RSC)
Correction for ‘Macroscopic covalent organic framework architectures for water remediation’ by Abdul Khayum Mohammed et al., Environ. Sci.: Water Res. Technol., 2021, DOI: 10.1039/d1ew00408e.

Macroscopic covalent organic framework architectures for water remediation
Abdul Khayum Mohammed and Dinesh Shetty
Royal Society of Chemistry (RSC)
This article has critically reviewed the story of macroscopic developments of COFs for water remediation. The various macroscopic COFs for removing toxic organic and inorganic pollutants have been systematically surveyed.

Connecting Microscopic Structures, Mesoscale Assemblies, and Macroscopic Architectures in 3D-Printed Hierarchical Porous Covalent Organic Framework Foams
Abdul Khayum Mohammed, Saurabh Usgaonkar, Fayis Kanheerampockil, Suvendu Karak, Arjun Halder, Minakshi Tharkar, Matthew Addicoat, Thalasseril G. Ajithkumar, and Rahul Banerjee
American Chemical Society (ACS)
The induction of macro and mesopores into two-dimensional porous covalent organic frameworks (COFs) could enhance the exposure of the intrinsic micropores toward the pollutant environment, thereby, improving the performance. However, the challenge is to build a continuous hierarchically porous macro-architecture of crystalline organic materials in the bulk scale. In this regard, we have strategized a novel synthetic method to create hierarchically porous COF foams consisting of ordered micropores (2-2.2 nm), disordered meso and macropores (50 nm to 200 µm) as well as ordered macropores (1.5 mm to 2 cm). Herein, graphene oxide was used for creating disordered macro and meso pores in COF-GO foams. Consider-ing the rheological features of the precursor hydrogel, we could integrate crystalline and porous COF-GO foams into self-supported 3D-printed objects with the desired shapes and sizes. Therefore, we have engineered the 3D macro-architecture of COF-GO foams into complex geometries keeping their structural order and continuous porosity intact over a range of more than a million (10-9 m to 10-3 m). The interconnected 3D openings in these COF-GO foams further enhance the rapid and efficient uptake of organic and inorganic pollutants from water (>95% removal within 30 s). The abundant distribution of interconnected macroporous volume (55%) throughout the COF-GO foam matrix enhances the flow of water (1.13 × 10-3 m.s-1) which results in efficient mass transport and adsorption.

Weak Intermolecular Interactions in Covalent Organic Framework-Carbon Nanofiber Based Crystalline yet Flexible Devices
Abdul Khayum Mohammed, Vidyanand Vijayakumar, Arjun Halder, Meena Ghosh, Matthew Addicoat, Umesh Bansode, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
The redox-active and porous structural backbone of covalent organic frameworks (COFs) can facilitate high-performance electrochemical energy storage devices. However, the utilities of such 2D-materials as supercapacitor electrodes in advanced self power-pack systems have been obstructed due to the poor electrical conductivity and subsequent indigent performance. Herein, we report an effective strategy to enhance the electrical conductivity of COF thin sheets through the in situ solid-state inclusion of carbon nanofiber (CNF) into the COF precursor matrix. The obtained COF-CNF hybrids possess a significant intermolecular •••interaction between COF and the graphene layers of the CNF. As a result, these COF-CNF hybrids (DqTp-CNF and DqDaTp-CNF) exhibit good electrical conductivity (0.25×10-3 Scm-1), as well as high performance in electrochemical energy storage (DqTp-CNF: 464 mFcm-2at 0.25 mAcm-2). Also, the fabricated, mechanically strong quasi-solid-state supercapacitor (DqDaTp-CNF SC) delivered an ultra-high device capacitance of 167 mFcm-2 at 0.5 mAcm-2. Furthermore, we integrated a monolithic photovoltaic self-charging power-pack by assembling DqDaTp-CNF SC with a perovskite solar cell. The fabricated self power-pack delivered excellent performance in the areal capacitance (42 mFcm-2) at 0.25 mAcm-2 after photo charging for 300 seconds.

Zinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery
Abdul Khayum M, Meena Ghosh, Vidyanand Vijayakumar, Arjun Halder, Maryam Nurhuda, Sushil Kumar, Matthew Addicoat, Sreekumar Kurungot, and Rahul Banerjee
Royal Society of Chemistry (RSC)
We have demonstrated a hydroquinone stitched β-ketoenamine COF acting as an efficient organic cathode in an aqueous rechargeable zinc ion battery.

Interlayer Hydrogen-Bonded Covalent Organic Frameworks as High-Performance Supercapacitors
Arjun Halder, Meena Ghosh, Abdul Khayum M, Saibal Bera, Matthew Addicoat, Himadri Sekhar Sasmal, Suvendu Karak, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
Covalent organic frameworks (COFs) have emerged as promising electrode materials in supercapacitors (SCs). However, their insoluble powder-like nature, poor capacitive performance in pristine form, integrated with inferior electrochemical stability is a primary concern for their long-term use in electrochemical devices. Keeping this in perspective, herein we report a redox active and hydrogen bonded COF with ultrahigh stability in conc. H2SO4 (18 M), conc. HCl (12 M) and NaOH (9 M). The as-synthesized COF fabricated as thin sheets were efficiently employed as a free-standing supercapacitor electrode material using 3 M aq. H2SO4 as an electrolyte. Moreover, the pristine COF sheet showcased outstanding areal capacitance 1600 mF cm-2 (gravimetric 169 F g-1) and excellent cyclic stability (>100 000) without compromising its capacitive performance or Coulombic efficiency. Moreover, as a proof-of-concept, a solid-state supercapacitor device was also assembled and subsequently tested.

Convergent Covalent Organic Framework Thin Sheets as Flexible Supercapacitor Electrodes
Abdul Khayum M, Vidyanand Vijayakumar, Suvendu Karak, Sharath Kandambeth, Mohitosh Bhadra, Karthika Suresh, Nikhil Acharambath, Sreekumar Kurungot, and Rahul Banerjee
American Chemical Society (ACS)
Flexible supercapacitors in modern electronic equipment require light-weight electrodes, which have a high surface area, precisely integrated redox moieties, and mechanically strong flexible free-standing nature. However, the incorporation of the aforementioned properties into a single electrode remains a great task. Herein, we could overcome these challenges by a facile and scalable synthesis of the convergent covalent organic framework (COF) free-standing flexible thin sheets through solid-state molecular baking strategy. Here, redox-active anthraquinone (Dq) and π-electron-rich anthracene (Da) are judiciously selected as two different linkers in a β-ketoenamine-linked two-dimensional (2D) COF. As a result of precisely integrated anthraquinone moieties, COF thin sheet exhibits redox activity. Meanwhile, π-electron-rich anthracene linker assists to improve the mechanical property of the free-standing thin sheet through the enhancement of noncovalent interaction between crystallites. This binder-free strategy offers the togetherness of crystallinity and flexibility in 2D COF thin sheets. Also, the synthesized porous crystalline convergent COF thin sheets are benefited with crack-free uniform surface and light-weight nature. Further, to demonstrate the practical utility of the material as an electrode in energy-storage systems, we fabricated a solid-state symmetrical flexible COF supercapacitor device using a GRAFOIL peeled carbon tape as the current collector.

Supramolecular Reassembly of Self-Exfoliated Ionic Covalent Organic Nanosheets for Label-Free Detection of Double-Stranded DNA
Arindam Mal, Rakesh K. Mishra, Vakayil K. Praveen, M. Abdul Khayum, Rahul Banerjee, and Ayyappanpillai Ajayaghosh
Wiley
AbstractIonic covalent organic nanosheets (iCONs), a member of the two‐dimensional (2D) nanomaterials family, offer a unique functional platform for a wide range of applications. Herein, we explore the potential of an ethidium bromide (EB)‐based covalent organic framework (EB‐TFP) that self‐exfoliates in water resulting in 2D ionic covalent organic nanosheets (EB‐TFP‐iCONs) for the selective detection of double‐stranded DNA (dsDNA). In an aqueous medium, the self‐exfoliated EB‐TFP‐iCONs reassemble in the presence of dsDNA resulting in hybrid EB‐TFP‐iCONs‐DNA crystalline nanosheets with enhanced fluorescence at 600 nm. Detailed steady‐state and time‐resolved emission studies revealed that the reassembly phenomenon was highly selective for dsDNA when compared to single‐stranded DNA (ssDNA), which allowed us to use the EB‐TFP‐iCONs as a 2D fluorescent platform for the label‐free detection of complementary DNA strands.

Chemically Delaminated Free-Standing Ultrathin Covalent Organic Nanosheets
M. Abdul Khayum, Sharath Kandambeth, Shouvik Mitra, Sanoop B. Nair, Anuja Das, Samadhan S. Nagane, Rabibrata Mukherjee, and Rahul Banerjee
Wiley
AbstractCovalent organic nanosheets (CONs) are a new class of porous thin two‐dimensional (2D) nanostructures that can be easily designed and functionalized and could be useful for separation applications. Poor dispersion, layer restacking, and difficult postsynthetic modifications are the major hurdles that need to be overcome to fabricate scalable CON thin films. Herein, we present a unique approach for the chemical exfoliation of an anthracene‐based covalent organic framework (COF) to N‐hexylmaleimide‐functionalized CONs, to yield centimeter‐sized free‐standing thin films through layer‐by‐layer CON assembly at the air–water interface. The thin‐layer fabrication technique presented here is simple, scalable, and does not require any surfactants or stabilizing agents.

RECENT SCHOLAR PUBLICATIONS

Modulating Core Polarity in Metal‐free Covalent Organic Frameworks for Selective Electrocatalytic Hydrogen Peroxide Production
S Mehta, N Elmerhi, S Kaur, AK Mohammed, TC Nagaiah, D Shetty
Angewandte Chemie 137 (5), e202417403 2025

Energy Efficient Memristor Based on Green‐Synthesized 2D Carbonyl‐Decorated Organic Polymer and Application in Image Denoising and Edge Detection: Toward Sustainable AI (Adv
P Pal, H Li, R Al‐Ajeil, AK Mohammed, A Rezk, G Melinte, A Nayfeh, ...
Advanced Science 11 (45), 2470279 2024

Energy Efficient Memristor Based on Green‐Synthesized 2D Carbonyl‐Decorated Organic Polymer and Application in Image Denoising and Edge Detection: Toward Sustainable AI
P Pal, H Li, R Al‐Ajeil, AK Mohammed, A Rezk, G Melinte, A Nayfeh, ...
Advanced Science 11 (45), 2408648 2024

MOFite: A High‐Density Lithiophilic and Scalable Metal–Organic Framework Anode for Rechargeable Lithium‐Ion Battery
S Gaber, AK Mohammed, BH Javaregowda, JI Martnez, PP Snchez, ...
Angewandte Chemie International Edition 63 (44), e202409256 2024

Iron salicylaldehydate conjugated metal–organic framework for quasi solid-state supercapacitor
AK Mohammed, A Pandikassala, PP Snchez, SA Gaber, S Canossa, ...
Chemical Engineering Journal 496, 153589 2024

Green Synthesis of Salicylaldehydate-Metal-Organic Frameworks and Applications Thereof
D Shetty, AK Mohammed
US Patent App. 18/243,310 2024

An In situ Proton Filter Covalent Organic Framework Catalyst for Highly Efficient Aqueous Electrochemical Ammonia Production (Adv. Energy Mater. 5/2024)
KC Ranjeesh, S Kaur, AK Mohammed, S Gaber, D Gupta, K Badawy, ...
Advanced Energy Materials 14 (5), 2470020 2024

An in situ proton filter covalent organic framework catalyst for highly efficient aqueous electrochemical ammonia production
KC Ranjeesh, S Kaur, AK Mohammed, S Gaber, D Gupta, K Badawy, ...
Advanced Energy Materials 14 (5), 2303068 2024

A carbonyl-decorated two-dimensional polymer as a charge-trapping layer for non-volatile memory storage devices with a high endurance and wide memory window
R Al-Ajeil, AK Mohammed, P Pal, MA Addicoat, SS Nair, D Kumar, ...
Materials Horizons 11 (16), 3878-3884 2024

Crystallizing covalent organic frameworks from metal organic framework through chemical induced-phase engineering
AK Mohammed, S Gaber, J Raya, T Skorjanc, N Elmerhi, S Stephen, ...
Scientific reports 13 (1), 19443 2023

Hypes and hopes on the materials development strategies to produce ammonia at mild conditions
S Singh, AK Mohammed, AA AlHammadi, D Shetty, K Polychronopoulou
International journal of hydrogen energy 48 (89), 34700-34739 2023

Enzyme-immobilized hierarchically porous covalent organic framework biocomposite for catalytic degradation of broad-range emerging pollutants in water
N Elmerhi, K Al-Maqdi, K Athamneh, AK Mohammed, T Skorjanc, ...
Journal of hazardous materials 459, 132261 2023

Chemically Gradient Hydrogen‐Bonded Organic Framework Crystal Film
AK Mohammed, J Raya, A Pandikassala, MA Addicoat, S Gaber, M Aslam, ...
Angewandte Chemie International Edition 62 (29), e202304313 2023

The fragmented 3D-covalent organic framework in cellulose acetate membrane for efficient phenol removal
AK Mohammed, JK Ali, MBS Kuzhimully, MA Addicoat, S Varghese, ...
Chemical Engineering Journal 466, 143234 2023

Salicylaldehydate coordinated two-dimensional-conjugated metal–organic frameworks
AK Mohammed, P Pena-Snchez, A Pandikassala, S Gaber, AA AlKhoori, ...
Chemical Communications 59 (18), 2608-2611 2023

Covalent organic framework based on azacalix [4] arene for the efficient capture of dialysis waste products
T Skorjanc, D Shetty, F Gndara, S Pascal, N Naleem, S Abubakar, L Ali, ...
ACS applied materials & interfaces 14 (34), 39293-39298 2022

Polythiacalixarene-Embedded Gold Nanoparticles for Visible-Light-Driven Photocatalytic CO₂ Reduction
T Skorjanc, KM Kamal, A Alkhoori, G Mali, AK Mohammed, Z Asfari, ...
ACS applied materials & interfaces 14 (27), 30796-30801 2022

Cover Picture: Solvent‐Influenced Fragmentations in Free‐Standing Three‐Dimensional Covalent Organic Framework Membranes for Hydrophobicity Switching (Angew. Chem. Int. Ed. 13
AK Mohammed, AA Al Khoori, MA Addicoat, S Varghese, I Othman, ...
Angewandte Chemie International Edition 61 (13), e202202622 2022

Solvent‐influenced fragmentations in free‐standing three‐dimensional covalent organic framework membranes for hydrophobicity switching
AK Mohammed, AA Al Khoori, MA Addicoat, S Varghese, I Othman, ...
Angewandte Chemie 134 (13), e202200905 2022

Metallated Isoindigo–Porphyrin Covalent Organic Framework Photocatalyst with a Narrow Band Gap for Efficient CO₂ Conversion
T Skorjanc, D Shetty, ME Mahmoud, F Gndara, JI Martinez, ...
ACS applied materials & interfaces 14 (1), 2015-2022 2021

MOST CITED SCHOLAR PUBLICATIONS

Self-exfoliated guanidinium-based ionic covalent organic nanosheets (iCONs)
S Mitra, S Kandambeth, BP Biswal, A Khayum M, CK Choudhury, ...
Journal of the American Chemical Society 138 (8), 2823-2828 2016
Citations: 467

Interlayer Hydrogen-Bonded Covalent Organic Frameworks as High-Performance Supercapacitors
RB Arjun Halder, Meena Ghosh, Abdul Khayum M.Saibal Bera, Matthew Addicoat ...
Journal of the American Chemical Society 2018
Citations: 391

Chemically delaminated free‐standing ultrathin covalent organic nanosheets
MA Khayum, S Kandambeth, S Mitra, SB Nair, A Das, SS Nagane, ...
Angewandte Chemie International Edition 55 (50), 15604-15608 2016
Citations: 303

Zinc ion interactions in a two-dimensional covalent organic framework based aqueous zinc ion battery
A Khayum, M Ghosh, V Vijayakumar, A Halder, M Nurhuda, S Kumar, ...
Chemical science 10 (38), 8889-8894 2019
Citations: 244

Convergent covalent organic framework thin sheets as flexible supercapacitor electrodes
A Khayum M, V Vijayakumar, S Karak, S Kandambeth, M Bhadra, ...
ACS applied materials & interfaces 10 (33), 28139-28146 2018
Citations: 158

Connecting microscopic structures, mesoscale assemblies, and macroscopic architectures in 3D-printed hierarchical porous covalent organic framework foams
AK Mohammed, S Usgaonkar, F Kanheerampockil, S Karak, A Halder, ...
Journal of the American Chemical Society 142 (18), 8252-8261 2020
Citations: 149

Supramolecular reassembly of self‐exfoliated ionic covalent organic nanosheets for label‐free detection of double‐stranded DNA
A Mal, RK Mishra, VK Praveen, MA Khayum, R Banerjee, A Ajayaghosh
Angewandte Chemie 130 (28), 8579-8583 2018
Citations: 149

Weak intermolecular interactions in covalent organic framework-carbon nanofiber based crystalline yet flexible devices
AK Mohammed, V Vijayakumar, A Halder, M Ghosh, M Addicoat, ...
ACS Applied Materials & Interfaces 11 (34), 30828-30837 2019
Citations: 63

Macroscopic covalent organic framework architectures for water remediation
AK Mohammed, D Shetty
Environmental science: water research & technology 7 (11), 1895-1927 2021
Citations: 41