SHAKTI SINGH
@bbau.ac.in
Research scholar
Babasaheb Bhimrao Ambedkar University , Lucknow, India
RESEARCH INTERESTS
Self-healing
Nanogenerator
Sensors
Self-powered sensors
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ajeet Singh, Shakti Singh, and Bal Chandra Yadav
Elsevier BV
Abhisikta Bhaduri, Shakti Singh, and Manoj Kumar Gupta
American Chemical Society (ACS)
Ajeet Singh, Shakti Singh, and B.C. Yadav
Elsevier BV
Shakti Singh, Prabhakar Yadav, Manoj Kumar Gupta, Gulzhian I. Dzhardimalieva, Jinhwan Yoon, Chiranjit Maiti, and Bal Chandra Yadav
Elsevier BV
Abhisikta Bhaduri, Shakti Singh, Khem B. Thapa, and B.C. Yadav
Elsevier BV
Abhisikta Bhaduri, Shakti Singh, Khem B. Thapa, and B.C. Yadav
Elsevier BV
Shakti Singh, Ravi Kant Tripathi, Manoj Kumar Gupta, Gulzhian I. Dzhardimalieva, Igor E. Uflyand, and BalChandra Yadav
Elsevier BV
This work demonstrates an easy and cost-effective synthesis of PANI-PPY conducting nanoflakes (NFs) with a self-healing capability. Scanning electron microscopic (SEM) analysis shows the minimum width of NFs as 30 nm, while HRTEM analysis confirms the shape, size, and semi-crystalline nature of the polymer. These PANI-PPY NFs were used to fabricate a contact separation mode triboelectric nanogenerator (TENG) based self-powered photosensor which gave the maximum output voltage (149 V), maximum output current (16 µA), current density 0.56 µAcm-2, and power density 83.56 µWcm-2. Detailed literature survey shows the comparative study of PANI-PPY NF's with other photo-sensing materials. This literature review highlights the tremendous ability of PANI-PPY to self-restore and ultra-fast self-powering nature. This work also demonstrates a very easy and cost-effective method to develop polymeric nanomaterials via temperature-assisted polymerization, which need only a stirrer with a hot plate. Theoretical analysis (DFT calculations using Gaussian 09 and Gauss view 05) shows a consistent increase in stability when the number of molecules in the polymer chains analyzed was increased. The developed self-healing triboelectric nanogenerators exhibited stable performance before and after healing.
Abhisikta Bhaduri, Shakti Singh, Ravi Kant Tripathi, Utkarsh Kumar, Khem B. Thapa, and B.C. Yadav
Elsevier BV
Abstract In this study, dual-layered self-healable LPG sensor which can successfully re-establish both of its structural and sensing properties after an external deformation occurred, has been reported. Here Ni0.4Zn0.6Fe2O4 (NZF) works as a highly sensitive LPG sensor which can detect LPG well below the lowest explosion limit (LEL) efficiently. The self-healing phenomenon has been achieved by urea-formaldehyde (U-F) microcapsules encapsulating NZF and linseed oil. The dual-layered self-healable sensing film is prepared by forming a lower layer using urea-formaldehyde (U-F) microcapsules capturing linseed oil and NZF, serving as healing layer, and an upper layer using NZF aiding sensing phenomenon. LPG sensing parameters like sensitivity, sensor response, recovery time and response time were investigated in case of both uncracked sample and healed sample to get a clear idea of how much sensing properties were recovered after healing took place. The minimum response and recovery times of the uncracked film corresponding to 0.5 vol.% LPG concentrations were found to be 28.08 s and 52.46 s respectively, whereas, the same after healing were as 34.39 s and 45.17 s respectively. After healing, ∼ 86.4 % sensitivity was restored. This is the first dual-layered microcapsule-based LPG sensor, which has healing property.
Gulzhian I. Dzhardimalieva, Bal C. Yadav, Shakti Singh, and Igor E. Uflyand
Royal Society of Chemistry (RSC)
Recent achievements and problems associated with the use of metallopolymers as self-healing and shape memory materials are presented and evaluated.
Shakti Singh, Abhisikta Bhaduri, Ravi Kant Tripathi, Khem Bahadur Thapa, Rajeev Kumar, and Bal Chandra Yadav
Elsevier BV
Abstract In this work, a bilayered ultra responsive self-healable photodetector that can restore both its structure as well as sensing property after deformation has been reported. This photodetector is based on ferrite with ultrafast sensing ability along with restoration property. In this dual-layered structure, the upper layer is Ni0.2Zn0.8Fe2O4 (NZF) prepared by citrate gel method and acts as sensing layer, whereas, the lower layer is Urea-Formaldehyde (U-F) microcapsules with flaxseed oil and NZF core. Here bottom layer acts as a healing layer, which can successfully restore film sensing property after deformation. Flaxseed oil acts as a medium to transport NZF from lower layer to the upper sensing area, which was deformed manually. The evaluated photoresponse and recovery time of NZF before deformation are 1.74 sec and 3.28 sec at 100 mW/cm2 respectively, whereas, response and recovery after healing were 1.75 sec and 2.84 sec respectively. The solar light photodetector based on microcapsule that can restore its sensing property ∼98.5%. The purpose of this work is to develop a method by which anyone can fabricate the different types of self-healable solar light photodetector.
Samiksha Sikarwar, Satyendra, Shakti Singh, and Bal Chandra Yadav
Springer Science and Business Media LLC
This paper reports the state of art in a variety of pressure and the detailed study of various matrix based pressure sensors. The performances of the bridges, buildings, etc. are threatened by earthquakes, material degradations, and other environmental effects. Structural health monitoring (SHM) is crucial to protect the people and also for assets planning. This study is a contribution in developing the knowledge about self-sensing smart materials and structures for the construction industry. It deals with the study of self-sensing as well as mechanical and electrical properties of different matrices based on pressure sensors. The relationships among the compression, tensile strain, and crack length with electrical resistance change are also reviewed.
Samiksha Sikarwar, Shakti Singh, Satyendra, Richa Srivastava, B C Yadav, and V V Tyagi
IOP Publishing
This work deals with fibre optic pressure sensors for Structural Health Monitoring (SHM) based on the piezo-optic principle. Various samples were prepared and investigated under room ambient conditions. In one of the samples, periodic microbends of 1 cm spatial periodicity were introduced in the PCS600 optical fibre, which was then embedded in an Araldite matrix with the composition of 60% hardener and 40% resin. This sample was marked as S1. In another sample, the same fibre without microbending was embedded in the same Araldite matrix, and was marked as S2. In another sample, the fibre without microbending was embedded in a cement matrix composite, and was marked as S3. Sample S3 was an effort to develop a pressure sensor for real working environment. Here conventional portland cement was used for the fabrication of the sample. High pressure up to 60 KPa was applied to the sample under cyclic loading and unloading, and the corresponding output power noted. Sensitivities of fibre optic pressure sensor for samples S1, S2 and S3 are 2.304, 0.906 and 2.218 nW KPa–1, with reproducibilities 96.61%, 97.95% and 87.24% respectively. The sensitivities obtained indicate that the sensor has excellent potential to replace existing bulky electrical sensors.