Assistant Professor, Department of Electrical and Electronics Engineering National Institute of Technical Teachers’ Training and Research (NITTTR), Bhopal
Impact of Triple Roll Milling Processing Parameters on Fluidic/Rheological and Electrical Properties of Aqueous Graphene Ink Sandeep Kumar, Pramod Kumar, Kapil Bhatt, Shilpi Shrivastva, Amit Kumar, Ravinder Singh, Rajesh Punia, Chandra Charu Tripathi Advanced Engineering Materials, 2020 Graphene ink is a potential candidate for the printing of electronic devices. Rheological studies of graphene inks are necessary to estimate and tune the behavior of ink during and after printing. Ink constituents and their fundamental properties play an important role in modifying the rheological behavior of ink. During the processing of ink, modification of these properties takes place. So, it is quite important to investigate the role of processing equipment on the ink constituents and correspondingly on the rheological behavior of ink and printed functional devices. Herein, graphene ink formulation through a triple roll mill (TRM) is presented. The particle size of graphene ink reduces substantially with both the speed of rollers and number of passes. Approximately 52% reduction in particle size is observed after five passes at the highest roller speed, and it further reduces up to 72% with an increase in the number of passes. Correspondingly, solvent loss, density, and viscosity of the inks are observed in respect of roller speed and number of passes. The impact of TRM parameters on ink constituents, rheology, and electrical properties of screen‐printed resistors is discussed and explained in terms of simple analytical models.
Alternative transparent conducting electrode materials for flexible optoelectronic devices S. Sharma, S. Shriwastava, S. Kumar, K. Bhatt, C. Charu Tripathi Opto Electronics Review, 2018 Transparent Conductive Electrode (TCE) is an essential part of the optoelectronic and display devices such as Liquid Crystal Displays (LCDs), Solar Cells, Light Emitting Diodes (LEDs), Organic Light Emitting Diodes (OLEDs) and touch screens. Indium Tin Oxide (ITO) is a commonly used TCE in these devices because of its high transparency and low sheet resistance. However, scarcity of indium and brittle nature of ITO limit its use in future flexible electronics. In order to develop flexible optoelectronic devices with improved performance, there is a requirement of replacing the ITO with a better alternate TCE. In this work, several alternative TCEs including transparent conductive oxides, carbon nanotubes, conducting polymers, metal nanowires, graphene and composites of these materials are studied with their properties such as sheet resistance, transparency and flexibility. The advantage and current challenges of these materials are also presented in this work.
A facile approach to fabricate graphene based piezoresistive strain sensor on paper substrate Indian Journal of Pure and Applied Physics, 2018
Investigating PMMA as a potential insulator material for Metal-Insulator-Metal diode Shilpi Shriwastava, Kapil Bhatt, Sandeep Sharma, Sandeep Kumar, C.C. Tripathi International Journal of Nanoparticles, 2018 The metal-insulator-metal (MIM) diodes are considered very promising for high frequency applications because of its tunnelling-based ultrafast charge transport mechanism. A wide variety of materials are being explored in quest of developing these thin film devices. Recently, organic insulator-based MIM diodes have attracted significant attention to the researchers due to its several advantages and have become a promising alternative of conventional inorganic insulators. In the present work the feasibility of an organic polymer polymethyl methacrylate (PMMA) is investigated for insulating material of MIM junction. It is a transparent resin which is able to produce uniform and thin insulating layer with low defect density. In this work, an Al/PMMA/Cr structure is fabricated by optimising different process parameters in order to develop high performance, reproducible organic MIM diodes. The as fabricated device exhibited fairly asymmetric and nonlinear current-voltage characteristics, which reveals the viability of PMMA as candidate material for insulator layer in MIM diodes.
A study on design aspects of MIM diodes for high frequency applications Shilpi, Kapil Bhatt, Sandeep Kumar, Sandeep, C.C. Tripathi 2017 2nd International Conference for Convergence in Technology I2ct 2017, 2017 Structurally, an MIM diode is a very thin layer of insulator sandwiched between two metal electrodes. Owing to the tunneling based conduction mechanism it facilitates ultra-fast switching speed, desirable for many of the high frequency applications. However, due to thin insulator design considerations and underneath conduction mechanism, they normally do not exhibit diode like behavior. Therefore, the successful implementation of the diode in these applications demands highly non-linear and asymmetric current-voltage characteristics. This necessitates the consideration of design aspects of diode prior to its actual fabrication. In this paper the various design aspects of MIM diode is studied and their influence on the diode's figures of merit is investigated.
Investigation of voltage-dependent luminance of flexible FLG, rGO/PEDOT: PSS TCEs based organic light emitting diode S Sharma, K Singh, B Singh, S Shriwastava, Y Dwivedi, CC Tripathi Journal of Optics 54 (4), 2309-2313 , 2025 2025 Citations: 1
Significance of nano-materials, designs consideration and fabrication techniques on performances of strain sensors-A review K Singh, S Sharma, S Shriwastava, P Singla, M Gupta, CC Tripathi Materials Science in Semiconductor Processing 123, 105581 , 2021 2021 Citations: 76
A laser patterned zero bias Au/Al2O3/Mo metal-insulator-metal diode rectifier for RF detection S Shriwastava, DS Arya, S Sharma, K Singh, P Singh, CC Tripathi Solid-State Electronics 171, 107870 , 2020 2020 Citations: 2
Impact of triple roll milling processing parameters on fluidic/rheological and electrical properties of aqueous graphene ink S Kumar, P Kumar, K Bhatt, S Shrivastva, A Kumar, R Singh, R Punia, ... Advanced Engineering Materials 22 (4), 1901187 , 2020 2020 Citations: 15
Metal–Insulator–Metal Diodes: A Potential High Frequency Rectifier for Rectenna Application S Shriwastava, CC Tripathi Journal of Electronic Materials 48 (5), 2635-2652 , 2019 2019 Citations: 44
Alternative transparent conducting electrode materials for flexible optoelectronic devices S Sharma, S Shriwastava, S Kumar, K Bhatt, CC Tripathi Opto-Electronics Review 26 (3), 223-235 , 2018 2018 Citations: 165
A facile approach to fabricate graphene based piezoresistive strain sensor on paper substrate CCT Monika, Kapil Bhatt, Cheenu Rani, Ankit Kapoor, Pramod Kumar, Shilpi ... Indian Journal of Pure & Applied Physics (IJPAP) 56 (5), 361-366 , 2018 2018 Citations: 11
A comparative study of graphene and graphite-based field effect transistor on flexible substrate K Bhatt, C Rani, M Vaid, A Kapoor, P Kumar, S Kumar, S Shriwastawa, ... Pramana 90 (6), 75 , 2018 2018 Citations: 20
Flexible devices in the horizon of graphene PK C. C. Tripathi, Sandeep Kumar, Sandeep Sharma, Randhir Singh, Shilpi ... Emerging Trends In Applied Materials Science And Surface Engineering held at … , 2018 2018
Reaching the Unreached Through Science and Technology Shilpi, CC Tripathi 11th Science Communicators’ Meet in Indian Science Congress – 2018, Manipur … , 2018 2018
Fabrication and Characterization of Al/AlOx/Ni Metal Insulator Metal diode Shilpi, CC Tripathi 105th Indian Science Congress, Manipur , 2018 2018
Investigating PMMA as a potential insulator material for metal-insulator-metal diode S Shriwastava, K Bhatt, S Sharma, S Kumar, CC Tripathi International Journal of Nanoparticles 10 (3), 207-216 , 2018 2018 Citations: 1
A study on design aspects of MIM diodes for high frequency applications Shilpi, CC Tripathi 2017 2nd International Conference for Convergence in Technology (I2CT), 738-741 , 2017 2017 Citations: 3
Fabrication and characterization of Al/PMMA/Cr metal-insulator-metal diode Shilpi, CC Tripathi 2017 Devices for Integrated Circuit (DevIC), 17-19 , 2017 2017 Citations: 2
Terahertz Detectors (THzDs): Bridging the Gap for Energy Harvesting CCT Kapil Bhatt, Shilpi Shriwastava, Sandeep Kumar, Sandeep Terahertz Spectroscopy: A Cutting Edge Technology, 83-100 , 2017 2017 Citations: 110
Potential challenges and issues in implementation of MIM diodes for rectenna application Shilpi, CC Tripathi 2017 International Conference on Inventive Communication and Computational … , 2017 2017 Citations: 16
Fabrication and Characterization of Ni/NiO/Al Metal-Insulator-Metal Tunnel Junction Shilpi, K Bhatt, Sandeep, S Kumar, CC Tripathi 6th International symposium on Integrated Functionalities (ISIF-2017), at … , 2017 2017
A study on role of compression speed in LB based graphene film formation using ethanol spreading solvent CCT Shilpi, Kapil Bhatt, Sandeep, Sandeep Kumar International Conference on Nanomaterials and Nanotechnology, 01-03 March … , 2017 2017
Synthesis of Graphene Ink for Flexible Electronic Applications Using Vibroshaker SC Sandeep Kumar, Sandeep, Shilpi, Randhir Bhoria, C. C. Tripathi, Dinesh ... International Conference on Material Science & Technology, 01st-04th March … , 2016 2016
Novel Organic Light Emitting Diode Materials, Their Fabrication and Characterization for High Performance Applications CCT Sandeep, Sandeep Kumar, Shilpi, Randhir Bhoria International Conference on Material Science & Technology, 01st-04th March … , 2016 2016
MOST CITED SCHOLAR PUBLICATIONS
Alternative transparent conducting electrode materials for flexible optoelectronic devices S Sharma, S Shriwastava, S Kumar, K Bhatt, CC Tripathi Opto-Electronics Review 26 (3), 223-235 , 2018 2018 Citations: 165
Terahertz Detectors (THzDs): Bridging the Gap for Energy Harvesting CCT Kapil Bhatt, Shilpi Shriwastava, Sandeep Kumar, Sandeep Terahertz Spectroscopy: A Cutting Edge Technology, 83-100 , 2017 2017 Citations: 110
Significance of nano-materials, designs consideration and fabrication techniques on performances of strain sensors-A review K Singh, S Sharma, S Shriwastava, P Singla, M Gupta, CC Tripathi Materials Science in Semiconductor Processing 123, 105581 , 2021 2021 Citations: 76
Metal–Insulator–Metal Diodes: A Potential High Frequency Rectifier for Rectenna Application S Shriwastava, CC Tripathi Journal of Electronic Materials 48 (5), 2635-2652 , 2019 2019 Citations: 44
A comparative study of graphene and graphite-based field effect transistor on flexible substrate K Bhatt, C Rani, M Vaid, A Kapoor, P Kumar, S Kumar, S Shriwastawa, ... Pramana 90 (6), 75 , 2018 2018 Citations: 20
Potential challenges and issues in implementation of MIM diodes for rectenna application Shilpi, CC Tripathi 2017 International Conference on Inventive Communication and Computational … , 2017 2017 Citations: 16
Impact of triple roll milling processing parameters on fluidic/rheological and electrical properties of aqueous graphene ink S Kumar, P Kumar, K Bhatt, S Shrivastva, A Kumar, R Singh, R Punia, ... Advanced Engineering Materials 22 (4), 1901187 , 2020 2020 Citations: 15
A facile approach to fabricate graphene based piezoresistive strain sensor on paper substrate CCT Monika, Kapil Bhatt, Cheenu Rani, Ankit Kapoor, Pramod Kumar, Shilpi ... Indian Journal of Pure & Applied Physics (IJPAP) 56 (5), 361-366 , 2018 2018 Citations: 11
A study on design aspects of MIM diodes for high frequency applications Shilpi, CC Tripathi 2017 2nd International Conference for Convergence in Technology (I2CT), 738-741 , 2017 2017 Citations: 3
A laser patterned zero bias Au/Al2O3/Mo metal-insulator-metal diode rectifier for RF detection S Shriwastava, DS Arya, S Sharma, K Singh, P Singh, CC Tripathi Solid-State Electronics 171, 107870 , 2020 2020 Citations: 2
Fabrication and characterization of Al/PMMA/Cr metal-insulator-metal diode Shilpi, CC Tripathi 2017 Devices for Integrated Circuit (DevIC), 17-19 , 2017 2017 Citations: 2
Comparative Study of the Models Used for Calculation of Transport Characteristics in Metal-Insulator-Metal/MIIM Diodes K Bhatt, Shilpi, CC Tripathi Advanced Science Letters 21 (8), 2570-2573 , 2015 2015 Citations: 2
Investigation of voltage-dependent luminance of flexible FLG, rGO/PEDOT: PSS TCEs based organic light emitting diode S Sharma, K Singh, B Singh, S Shriwastava, Y Dwivedi, CC Tripathi Journal of Optics 54 (4), 2309-2313 , 2025 2025 Citations: 1
Investigating PMMA as a potential insulator material for metal-insulator-metal diode S Shriwastava, K Bhatt, S Sharma, S Kumar, CC Tripathi International Journal of Nanoparticles 10 (3), 207-216 , 2018 2018 Citations: 1
Flexible devices in the horizon of graphene PK C. C. Tripathi, Sandeep Kumar, Sandeep Sharma, Randhir Singh, Shilpi ... Emerging Trends In Applied Materials Science And Surface Engineering held at … , 2018 2018
Reaching the Unreached Through Science and Technology Shilpi, CC Tripathi 11th Science Communicators’ Meet in Indian Science Congress – 2018, Manipur … , 2018 2018
Fabrication and Characterization of Al/AlOx/Ni Metal Insulator Metal diode Shilpi, CC Tripathi 105th Indian Science Congress, Manipur , 2018 2018
Fabrication and Characterization of Ni/NiO/Al Metal-Insulator-Metal Tunnel Junction Shilpi, K Bhatt, Sandeep, S Kumar, CC Tripathi 6th International symposium on Integrated Functionalities (ISIF-2017), at … , 2017 2017
A study on role of compression speed in LB based graphene film formation using ethanol spreading solvent CCT Shilpi, Kapil Bhatt, Sandeep, Sandeep Kumar International Conference on Nanomaterials and Nanotechnology, 01-03 March … , 2017 2017
Synthesis of Graphene Ink for Flexible Electronic Applications Using Vibroshaker SC Sandeep Kumar, Sandeep, Shilpi, Randhir Bhoria, C. C. Tripathi, Dinesh ... International Conference on Material Science & Technology, 01st-04th March … , 2016 2016