Browsing by Author "Jewariya, Yogesh"

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    Design and simulation of 2450 MHz microwave cavity for resonance and off-resonance plasma diagnosis in-situ plasma irradiation facility
    (Institute of Physics, 2023-02-09T00:00:00) Swaroop, Ram; Kumar, Narender; Sabavath, Gopikishan; Choudhary, Virendra�Singh; Jewariya, Yogesh; Rodrigues, G.
    The microwave plasma diagnosis in-situ irradiation system has been developed at the Central University of Punjab, Bathinda. The final design is achieved by a combination of analytical and simulation methods using CST and Comsol Multiphysics software. Simulations outcome reveals the electric field profile at the center of the microwave plasma chamber is strong and dense. A strong electric field profile inside the microwave cavity has been verified by the confinement of the plasma in the absence of an external magnetic field. The magnetic field profile for the 2450 MHz microwave facility is simulated and confirmed experimentally. Different RF powers and working gas pressures have been used with Langmuir probes to record the plasma signal. As a second stage, we studied the practicality of using a plasma cavity to treat materials with plasma for materials science experiment in plasma environment. This work shows the results of a thorough computational analysis of a microwave plasma source that has been tested in lab. � 2023 IOP Publishing Ltd and Sissa Medialab.
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    Enhancing the electrochemical performance of TiO2 based material using microwave air plasma treatment with an ECR cavity
    (Frontiers Media S.A., 2022-11-24T00:00:00) Swaroop, Ram; Rani, Pinki; Jamwal, Gaurav; Sabavath, Gopikishan; Kumar, Haldhar; Jewariya, Yogesh
    The microwave-based plasma treatment facility at the Central University of Punjab Bathinda (CUPB) based on 2.45�GHz has been used to investigate the impact on the electrochemical performance of TiO2. This was accomplished by treating a number of pellets of TiO2 sample material with microwave plasma at an input power of 80�W. The palette is subjected to microwave plasma treatment at 30-, 60-, 80-, and 100-s intervals. Many such characterization methods, including UV-visible spectroscopy, FTIR, XRD, and FESEM, have been applied to the study of the impact of plasma treatment on other physical and chemical properties in the context of untreated pellets. In the 80-s plasma treatment, the FTIR study showed that the (O-Ti-O) vibration band at 500�900�cm?1 was wider than other bands. The UV results showed that an 80-s plasma treatment decreased the sample�s band gap by 37% and increased the amount of disordered, amorphous material in the sample that had not been treated. XRD studies show that a sample that was treated with plasma for 80�s has low crystallinity and a high disorder (amorphous) factor. The Nyquist plot showed that the electrochemical charge transfer resistance drops from 7 (not treated) to 4 after 80�s of plasma treatment. In a study of electrochemical performance, a sample that was treated with plasma for 80�s has a capacitance that is 35% higher than a sample that was not treated. Copyright � 2022 Swaroop, Rani, Jamwal, Sabavath, Kumar and Jewariya.
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    Reduced graphene oxide doped tellurium nanotubes for high performance supercapacitor
    (Frontiers Media S.A., 2022-10-20T00:00:00) Rani, Pinki; Alegaonkar, Ashwini P.; Biswas, Rathindranath; Jewariya, Yogesh; Kanta Haldar, Krishna; Alegaonkar, Prashant S.
    Supercapacitors have been achieving great interest in energy storage systems for the past couple of decades. Such devices with superior performance, mainly, depending on the material architecture of the electrodes. We report on the preparation of Tellurium nanotubes (Te-tubes diameter ?100�nm and length ?700�nm), with variable doping of conducting network reduced graphene oxide (rGO) to fabricate high-performance electrode characteristics of rGO @ Te. The prepared material was characterized using XRD, FTIR, FESEM, and Raman spectroscopy techniques, including Brunauer-Emmett-Teller, Barrett-Joyner-Halenda measurements. FTIR study revealed that 15% rGO @ Te has a wide C-O vibration band at ? 1,100�1,300�cm?1, over other compositions. FESEM study shows the Te-tubes dispersion in rGO layers. The EDX study revealed that 15% of the composition has an optimistic concentration of C and O elements. In other compositions, either at lower/higher rGO concentration, an uneven count of C and O is observed. These support efficient charge dynamics to achieve superior ultra-capacitor characteristics, thereby achieving specific capacitance Csp 170 + F/g @ 10�mV/s in a symmetric configuration. The reported values are thirty times higher than pristine Te-tubes (?5�F/g). This finding suggests that rGO @ Te is a promising candidate for supercapacitor. Copyright � 2022 Rani, Alegaonkar, Biswas, Jewariya, Kanta Haldar and Alegaonkar.
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    Synergistic photophysical and electrochemical response of Te @ PANI for energy harvesting
    (Springer, 2023-01-07T00:00:00) Rani, Pinki; Jewariya, Yogesh; Haldar, Krishna Kanta; Biswas, Rathindranath; Alegaonkar, Prashant S.
    Materials with synergistic functionality are of great importance in consumer electronics. We report on the preparation and assessments of Te @ PANI composite for energy conversion and storage application. Initially, (5�15%) Te @ PANI composites were synthesized by the facile, room temperature, time and cost-effective solid-state synthesis technique followed by characterizations using Fourier transform infra-red, UV-Visible, energy dispersive spectroscopic including X-ray diffractometry and field electron scanning microscopy. Te exfoliates polymeric segments of PANI by bonding benzenoid rings through sulphonated impurity sites which have a profound impact on symmetry molecular bond vibrations. Its analysis is presented. In photophysical application, both dark and luminescent I-V measurements have been performed that showed a linear variation with minimum photo-resistance offered by 10% composite and reaching current > 10�mA under 1.5�V biased conditions. In storage response, Te @ PANI supercapacitor devices are dominating in inductive coupling over capacitive coupling by ten times. Corresponding shunt impedance is seen to be favourably lower for 10% composition, and respective charge transfer impedance has also followed identical behaviour over other classes of samples. The quality factor of the device for 10% is found to be almost twelve times better. However, at a low scan rate (10�mV/s), the presence of Te has changed the tendency of ion migration, thereby, reducing the magnitude of ion current by about three times with an increase in Te from 5 to 15%. Thus, fabricated composite demonstrated synergistic aspects of energy. � 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.