Shivaji University

About: Shivaji University is a education organization based out in Kolhāpur, Maharashtra, India. It is known for research contribution in the topics: Thin film & Scanning electron microscope. The organization has 3078 authors who have published 5295 publications receiving 115397 citations.

Facile synthesis of hierarchical mesoporous weirds-like morphological MnO2 thin films on carbon cloth for high performance supercapacitor application.

Abstract: The mesoporous nanostructured metal oxides have a lot of capabilities to upsurge the energy storing capacity of the supercapacitor. In present work, different nanostructured morphologies of MnO2 have been successfully fabricated on flexible carbon cloth by simple but capable hydrothermal method at different deposition temperatures. The deposition temperature has strong influence on reaction kinetics, which subsequently alters the morphology and electrochemical performance. Among different nanostructured MnO2 thin films, the mesoporous weirds composed thin film obtained at temperature of 453 K exhibits excellent physical and electrochemical features for supercapacitor application. The weirds composed MnO2 thin film exhibits specific surface area of 109 m2 g−1, high specific capacitance of 595 F g−1 with areal capacitance of 4.16 F cm−2 at a scan rate of 5 mV s−1 and high specific energy of 56.32 W h kg−1. In addition to this, MnO2 weirds attain capacity retention of 87 % over 2000 CV cycles, representing better cycling stability. The enhanced electrochemical performance could be ascribed to direct growth of highly porous MnO2 weirds on carbon cloth which provide more pathways for easy diffusion of electrolyte into the interior of electroactive material. The as-fabricated electrode with improved performance could be ascribed as a potential electrode material for energy storage devices.

The synthesis of multifunctional porous honey comb-like La2O3 thin film for supercapacitor and gas sensor applications.

Abstract: The porous honey comb-like La 2 O 3 thin films have been synthesized using one step spray pyrolysis method. The influence of sprayed solution quantity on properties of La 2 O 3 thin films is studied using X-ray diffraction, Fourier transform spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, optical absorption and Brunauer-Emmett-Teller techniques. Morphology of La 2 O 3 electrode is controlled with sprayed solution quantity. The supercapacitive properties of La 2 O 3 thin film electrode are investigated using cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance techniques. The La 2 O 3 film electrode exhibited the specific capacitance of the 166 F g −1 with 85% stability for the 3000 cycles. The La 2 O 3 film electrode exhibited sensitivity of 68 at 523 K for 500 ppm CO 2 gas concentration. The possible CO 2 sensing mechanism is discussed.

Cu2ZnSnS4 (CZTS)-based room temperature liquefied petroleum gas (LPG) sensor

Abstract: In the present manuscript, we report for the first time Cu 2 ZnSnS 4 (CZTS)-based heterojunction (p-CZTS/n-ZnO) used for room temperature liquefied petroleum gas (LPG) sensing. Specifically, the nanostructured ZnO has been grown chemically onto the sputtered CZTS thin films. The formations of phase pure CZTS and ZnO are confirmed by X-ray diffraction studies. The high quality heterojunction between compact CZTS and nanosized ZnO is obtained. At room temperature, the CZTS-based heterojunction exhibited gas response of 19.3% upon exposure to 1200 ppm of LPG with faster response and recovery time of 70 and 40 s.

Synthesis, structural and magnetic properties of different metal ion substituted nanocrystalline zinc ferrite

Abstract: The nanocrystalline ZnMFeO4 (M = Fe, Mn, Cr and Ti) ferrites were synthesized by sol–gel autocombustion route. XRD studies on these compositions revealed the formation of cubic phase for Cr and Ti substituted zinc ferrite, while tetragonal for phase for Mn substituted samples. The FT-IR data revealed two absorption bands in the range 400–800 cm−1 arising due to tetrahedral (A) and octahedral (B) stretching vibrations. Surface morphology of all the samples studied by scanning electron microscopy technique revealed nearly spherical particles and agglomerates. The elemental analysis as obtained from EDAX is in close agreement with the starting composition used for the synthesis. The ferromagnetic properties studied by VSM indicate a significant role on the magnetic properties of the samples. The detailed results of XRD, infrared spectroscopy, SEM and magnetic properties indicating the role of substitution of different metal ions on the structural and magnetic properties of zinc ferrites are presented in the manuscript.