Rajkumar C (Rajkumar Chinnasamy)

Scopus Publications

Enhanced photoconductive response of ZnO thin films with the impact of annealing temperatures on structural and optical properties
Rajkumar C, Arunachalam Arulraj
Scientific Reports, 2025
Zinc oxide (ZnO) is a versatile material widely used in optoelectronic devices due to its broad bandgap (3.37 eV), high electron mobility, and significant exciton binding energy (60 meV). In this study, ZnO thin films were fabricated on SiO₂/Si substrates via thermal evaporation, followed by annealing at 400 °C and 600 °C to investigate the effect of thermal treatment on their structural, optical, and photoconductive properties. X-ray diffraction (XRD) analysis confirmed the formation of the hexagonal wurtzite ZnO structure, with improved crystallinity observed at higher annealing temperatures. The photoconductivity of the films demonstrated enhanced response times and self-powered behavior, particularly in the sample annealed at 600 °C. These findings highlight the potential of ZnO thin films for fast-response photodetection applications and show that controlled annealing significantly influences photosensitivity.
Growth of epitaxial 2D Zn NDs and transform to 3D ZnO nanostructures for UV photodetector
P.V. Chandrasekar, Rajesh Dagupati, Charan Kuchi, M. Chandrasekar, K.V. Sreenivasulu, Rajkumar Chinnasamy, Pratap Kollu, Thanikaikarasan Sethuramachandran
Inorganic Chemistry Communications, 2025
One-step synthesis of needle-like lanthanum-doped TiO2 nanomaterials and their photoconductivity activity in air medium
Rajkumar C, Arunachalam Arulraj
Materials Letters, 2025
Influence of Sn4+ substitution on the ZnO crystal structure and their enhanced fibre optic gas sensing and photocatalytic degradation performance
Rajkumar C, Balamurugan K.S, Chinmaya Kumar Pradhan, Arulraj A, Kalaiselvan M, Arokia Doss S, Ramesh Babu A. C, Vasudeva Reddy Minnam Reddy, Woo Kyoung Kim, Aslam Khan
Physica B Condensed Matter, 2023
A sustainable energy transition to build a safer future: An introduction
A Arulraj, C Rajkumar, Chan Siew Hwa, R V Mangalaraja
Materials Technology for the Energy and Environmental Nexus, 2023
In this chapter the significance of sustainable energy systems, the recent generation of energy conversion (thin-film solar cells), hydrogen production with advanced functional materials, CO2 capture, energy storage systems (supercapacitors and batteries), and environmental remediation are outlined.
Nanoarchitectonics of Layered Metal Chalcogenides-Based Ternary Electrocatalyst for Water Splitting
Arunachalam Arulraj, Praveen Kumar Murugesan, Rajkumar C., Alejandra Tello Zamorano, Ramalinga Viswanathan Mangalaraja
Energies, 2023
The research on renewable energy is actively looking into electrocatalysts based on transition metal chalcogenides because nanostructured electrocatalysts support the higher intrinsic activity for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). A major technique for facilitating the conversion of renewable and sustainable energy is electrochemical water splitting. The aim of the review is to discuss the revelations made when trying to alter the internal and external nanoarchitectures of chalcogenides-based electrocatalysts to enhance their performance. To begin, a general explanation of the water-splitting reaction is given to clarify the key factors in determining the catalytic performance of nanostructured chalcogenides-based electrocatalysts. To delve into the many ways being employed to improve the HER’s electrocatalytic performance, the general fabrication processes utilized to generate the chalcogenides-based materials are described. Similarly, to enhance the OER performance of chalcogenides-based electrocatalysts, the applied complementary techniques and the strategies involved in designing the bifunctional water-splitting electrocatalysts (HER and OER) are explained. As a conclusive remark, the challenges and future perspectives of chalcogenide-based electrocatalysts in the context of water splitting are summarized.
Effect of annealing temperature on response time of ZnO photoconductor fabricated using thermal evaporation technique
Rajkumar C
Physica Scripta, 2022
ZnO has been deposited on SiO 2 /Si substrate using thermal evaporation technique. Further, the deposited ZnO thin film has been annealed at 400 °C, 600 °C, and 800 °C separately. The deposited ZnO thin films have been characterized using Ultraviolet-visible Diffuse Reflectance Spectroscopy (UV–vis DRS), Atomic force microscopy (AFM), x-ray diffraction (XRD) technique, and Scanning electron microscopy (SEM). The deposited ZnO thin films have multiphase structures of ZnO such as hexagonal, unknown and cubic. UV-visible spectra of deposited films show absorbance edges in UV and visible regions. The average particle size of non-annealed ZnO is ∼60 nm, whereas annealed ZnO (at 800 °C) is ∼124 nm. The average surface roughness of ZnO sample annealed at 800 °C is lower than that of non-annealed ZnO sample and ZnO samples annealed at 400 °C and 600 °C. Sputtering technique has been used to make gold contact on ZnO film for testing the photoconductivity property. The rise time of ZnO photoconductor annealed at 800 °C (T r = 0.04 s) is very fast as compared to that of all other ZnO photoconductors prepared using non-annealed ZnO sample and ZnO samples annealed at 400 °C and 600 °C.
Engineering 2D chalcogenides for energy and environmental remediation
A Arulraj, N Thachnatharen, C Rajkumar, R V Mangalaraja
Nanostructured Materials for Sustainable Energy and Environmental Remediation, 2022
Halide perovskite for photodetector applications
C. Rajkumar, P. Vengatesh, T.S. Shyju, A. Arulraj, R.V. Mangalaraja
Low Dimensional Halide Perovskites Structure Synthesis and Applications, 2022
Annealing temperature mediated enhanced photosensitivity in bicone-like and flower-like structures of ZnO synthesized using Co-precipitation method
C. Rajkumar, Rajneesh Kumar Srivastava
Optical Materials, 2020
UV–visible photoresponse properties of self-seeded and polymer mediated ZnO flower-like and biconical nanostructures
C Rajkumar, Rajneesh Kumar Srivastava
Results in Physics, 2019
Light scattering materials as photoanodes
Rajkumar C, A. Arulraj
Interfacial Engineering in Functional Materials for Dye Sensitized Solar Cells, 2019
Structural, optical and photoconductivity studies of ZnO bicones synthesized by seed-mediated method
C. Rajkumar
Vacuum, 2019
Time dependent rise and decay of photocurrent in zinc oxide nanoparticles in ambient and vacuum medium
Rajkumar C, Rajneesh K Srivastava
Materials Research Express, 2018
Seed mediated synthesis of nanosized zinc oxide and its electron transporting activity in dye-sensitized solar cells
C Rajkumar, Arunachalam Arulraj
Materials Research Express, 2018

RECENT SCHOLAR PUBLICATIONS

Growth of epitaxial 2D Zn NDs and transform to 3D ZnO nanostructures for UV photodetector
PV Chandrasekar, R Dagupati, C Kuchi, M Chandrasekar, ...
Inorganic Chemistry Communications 180, 114928 , 2025
2025
Encapsulation of Essential Oil by Nanoemulsion
K Sangeetha, S Prem Prakash, R C
Essential Oil Extraction from Food By-Products, 319 , 2025
2025
Enhanced photoconductive response of ZnO thin films with the impact of annealing temperatures on structural and optical properties
A Arulraj
Scientific Reports 15 (1), 1-10 , 2025
2025
Citations: 26
One-step synthesis of needle-like lanthanum-doped TiO2 nanomaterials and their photoconductivity activity in air medium
C Rajkumar, A Arulraj
Materials Letters 380, 137733 , 2025
2025
Citations: 2
Influence of Sn4+ substitution on the ZnO crystal structure and their enhanced fibre optic gas sensing and photocatalytic degradation performance
C Rajkumar, KS Balamurugan, A Arulraj, M Kalaiselvan, S Arokia Doss, ...
Physica B: Condensed Matter 667, 415139 , 2023
2023
Citations: 3
A sustainable energy transition to build a safer future: an introduction
A Arulraj, C Rajkumar, CS Hwa, RV Mangalaraja
Materials Technology for the Energy and Environmental Nexus, Volume 1 1, 1-1 … , 2023
2023
Citations: 25
Photosensitivity and structural properties of vanadium-doped ZnO and ZnO nanoparticle at various calcined temperature
G Mustafa, S Srivastava, MK Aziz, R Kanaoujiya, C Rajkumar
Materials Today: Proceedings , 2023
2023
Citations: 11
Nanoarchitectonics of Layered Metal Chalcogenides-Based Ternary Electrocatalyst for Water Splitting
A Arulraj, PK Murugesan, C Rajkumar, AT Zamorano, RV Mangalaraja
energies 16 (4), 1669 , 2023
2023
Citations: 40
Recent trends and materials used for environmental monitoring and applications
C Rajkumar, KH Rahman, PV Chandrasekar, KC Chen
Materials Technology for the Energy and Environmental Nexus, Volume 2 2, 26 , 2023
2023
Citations: 1
Halide perovskite for photodetector applications
C Rajkumar, V Panneerselvam, TS Shyju, A Arunachalam, ...
2023
Citations: 2
Studies on damage assessment of target materials using Ultrashort Pulse Laser
S Veerabuthiran, C Rajkumar, lahiri Bidisha, G Priya, G Chirantan, ...
National Laser Symposium (NLS-31), IIT Kharagpur, Kharagpur, 03-06 Dec, 2022 … , 2022
2022
Engineering 2D chalcogenides for energy and environmental remediation
A Arulraj, N Thachnatharen, C Rajkumar, RV Mangalaraja
Nanostructured Materials for Sustainable Energy and Environmental … , 2022
2022
Citations: 32
Effect of annealing temperature on response time of ZnO photoconductor fabricated using thermal evaporation technique
C Rajkumar
Physica Scripta 97 (11), 115806 , 2022
2022
Citations: 4
Trends in Metal Oxides Based Counter Electrode in Dye-Sensitized Solar Cells
C Rajkumar, A Arulraj
Counter Electrode for Dye‐Sensitized Solar Cells, 21-62 , 2021
2021
Annealing temperature mediated enhanced photosensitivity in bicone-like and flower-like structures of ZnO synthesized using Co-precipitation method
C Rajkumar, RK Srivastava
Optical Materials 109, 110367 , 2020
2020
Citations: 8
Light scattering materials as photoanodes
C Rajkumar, A Arulraj
Interfacial Engineering in Functional Materials for Dye‐Sensitized Solar … , 2019
2019
Citations: 8
UV–visible photoresponse properties of self-seeded and polymer mediated ZnO flower-like and biconical nanostructures
C Rajkumar, RK Srivastava
Results in Physics 15, 102647 , 2019
2019
Citations: 27
Structural, optical and photoconductivity studies of ZnO bicones synthesized by seed-mediated method
C Rajkumar
Vacuum 168, 108856 , 2019
2019
Citations: 7
Time dependent rise and decay of photocurrent in zinc oxide nanoparticles in ambient and vacuum medium
C Rajkumar, RK Srivastava
Materials Research Express 5 (5), 055002 , 2018
2018
Citations: 10
Anomalous photoconductivity behaviour of nanocubic shaped SrTiO3 materials for energy conversion applications
UM Usmaniya, LJ Berchman, A Arulraj, G Senguttuvan, C Rajkumar
Proceedings of the materials and technologies for energy conversion and … , 2018
2018

MOST CITED SCHOLAR PUBLICATIONS

Nanoarchitectonics of Layered Metal Chalcogenides-Based Ternary Electrocatalyst for Water Splitting
A Arulraj, PK Murugesan, C Rajkumar, AT Zamorano, RV Mangalaraja
energies 16 (4), 1669 , 2023
2023
Citations: 40
Engineering 2D chalcogenides for energy and environmental remediation
A Arulraj, N Thachnatharen, C Rajkumar, RV Mangalaraja
Nanostructured Materials for Sustainable Energy and Environmental … , 2022
2022
Citations: 32
Seed mediated synthesis of nanosized zinc oxide and its electron transporting activity in dye-sensitized solar cells
C Rajkumar, A Arulraj
Materials Research Express 5 (1), 015029 , 2018
2018
Citations: 29
UV–visible photoresponse properties of self-seeded and polymer mediated ZnO flower-like and biconical nanostructures
C Rajkumar, RK Srivastava
Results in Physics 15, 102647 , 2019
2019
Citations: 27
Enhanced photoconductive response of ZnO thin films with the impact of annealing temperatures on structural and optical properties
A Arulraj
Scientific Reports 15 (1), 1-10 , 2025
2025
Citations: 26
A sustainable energy transition to build a safer future: an introduction
A Arulraj, C Rajkumar, CS Hwa, RV Mangalaraja
Materials Technology for the Energy and Environmental Nexus, Volume 1 1, 1-1 … , 2023
2023
Citations: 25
Photosensitivity and structural properties of vanadium-doped ZnO and ZnO nanoparticle at various calcined temperature
G Mustafa, S Srivastava, MK Aziz, R Kanaoujiya, C Rajkumar
Materials Today: Proceedings , 2023
2023
Citations: 11
Time dependent rise and decay of photocurrent in zinc oxide nanoparticles in ambient and vacuum medium
C Rajkumar, RK Srivastava
Materials Research Express 5 (5), 055002 , 2018
2018
Citations: 10
Annealing temperature mediated enhanced photosensitivity in bicone-like and flower-like structures of ZnO synthesized using Co-precipitation method
C Rajkumar, RK Srivastava
Optical Materials 109, 110367 , 2020
2020
Citations: 8
Light scattering materials as photoanodes
C Rajkumar, A Arulraj
Interfacial Engineering in Functional Materials for Dye‐Sensitized Solar … , 2019
2019
Citations: 8
Structural, optical and photoconductivity studies of ZnO bicones synthesized by seed-mediated method
C Rajkumar
Vacuum 168, 108856 , 2019
2019
Citations: 7
Effect of annealing temperature on response time of ZnO photoconductor fabricated using thermal evaporation technique
C Rajkumar
Physica Scripta 97 (11), 115806 , 2022
2022
Citations: 4
Influence of Sn4+ substitution on the ZnO crystal structure and their enhanced fibre optic gas sensing and photocatalytic degradation performance
C Rajkumar, KS Balamurugan, A Arulraj, M Kalaiselvan, S Arokia Doss, ...
Physica B: Condensed Matter 667, 415139 , 2023
2023
Citations: 3
One-step synthesis of needle-like lanthanum-doped TiO2 nanomaterials and their photoconductivity activity in air medium
C Rajkumar, A Arulraj
Materials Letters 380, 137733 , 2025
2025
Citations: 2
Halide perovskite for photodetector applications
C Rajkumar, V Panneerselvam, TS Shyju, A Arunachalam, ...
2023
Citations: 2
Recent trends and materials used for environmental monitoring and applications
C Rajkumar, KH Rahman, PV Chandrasekar, KC Chen
Materials Technology for the Energy and Environmental Nexus, Volume 2 2, 26 , 2023
2023
Citations: 1
Growth of epitaxial 2D Zn NDs and transform to 3D ZnO nanostructures for UV photodetector
PV Chandrasekar, R Dagupati, C Kuchi, M Chandrasekar, ...
Inorganic Chemistry Communications 180, 114928 , 2025
2025
Encapsulation of Essential Oil by Nanoemulsion
K Sangeetha, S Prem Prakash, R C
Essential Oil Extraction from Food By-Products, 319 , 2025
2025
Studies on damage assessment of target materials using Ultrashort Pulse Laser
S Veerabuthiran, C Rajkumar, lahiri Bidisha, G Priya, G Chirantan, ...
National Laser Symposium (NLS-31), IIT Kharagpur, Kharagpur, 03-06 Dec, 2022 … , 2022
2022
Trends in Metal Oxides Based Counter Electrode in Dye-Sensitized Solar Cells
C Rajkumar, A Arulraj
Counter Electrode for Dye‐Sensitized Solar Cells, 21-62 , 2021
2021

Rajkumar C (Rajkumar Chinnasamy)

RESEARCH, TEACHING, or OTHER INTERESTS

Scopus Publications

RECENT SCHOLAR PUBLICATIONS

MOST CITED SCHOLAR PUBLICATIONS