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SnO2 thin-film gas sensors were easily created using the ion sputtering technique. The as-deposited SnO2 thin films consist of a tetragonal SnO2 phase and densely packed nanosized grains with diameters of approximately 20−80 nm, which are separated by microcracks. The as-deposited SnO2 thin film is well crystallized, with a dense columnar nanostructure grown directly onto the alumina material and the Pt electrodes. The grain size and thickness of SnO2 thin films are easily controlled by varying the sputtering time of the ion coater. The responses of the SnO2 thin-film sensors decrease as the SnO2 film thickness is increased, indicating that a negative association exists between the sensor response and the SnO2 film thickness due to gas diffusion from the surface. The SnO2 thin-film sensor, which was created by ion sputtering for 10 min, shows an excellent sensor response (Ra/Rg where Ra is the electric resistance under air and Rg is the electric resistance under the test gas) for detecting 1 ppm H2S at 350°C.

In this work, electrochemically active polydiphenylamine-silica reinforced graphene nanocomposite was prepared via an interfacial chemical oxidative polymerization method for energy storage application. The morphological views of synthesized nanocomposite were captured through scanning electron microscope (SEM). The supercapacitance behaviour of fabricated modified electrode was investigated by electrochemical analyses such as galvanostatic charge–discharge (GCD) and bode plot experiments. These results found that the chemically modified nanocomposite provides a high conductivity and also an afforded specific capacitance of ∼433 F/g with good cycling retention of 91% upto 500 cycles. Furthermore, the attained data will help in the profound study and further developments in energy storage device applications.

This reveals the synthesis, characterization and electrochemical studies of copper oxide (CuO) dispersed in polydiphenylamine (PDPA) matrix modified indium tin oxide (ITO/PDPA/CuO) nanohybrid electrode was fabricated using electrochemical deposition method. The structural morphology was captured through Field emission scanning electron microscopy (FESEM) and the confirmation of nanocomposites material of PDPA/CuO was achieved by Energy-dispersive X-ray spectroscopy (EDX). The electrochemical performance of (ITO/PDPA/CuO) modified nanohybrid electrode was investigated by Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS). The enhanced electrocatalytic activity of (ITO/PDPA/CuO) was due to the synergistic interaction of diphenoquinone diamine (DPDI2+) and CuO. Nyquist plot received from EIS ensures the enrichment of a fast electron transfer rate and can be used for various applications.

In this paper, KIT: Korea Advanced Institute of Science and Technology No. 6 (KIT-6) and MCM: Mobil Composition of Matter No. 48 (MCM-48) mesoporous silica templates were prepared by wrapping Pluronic (P123) and Cetyl trimethyl ammonium bromide (CTAB). Mesoporous Co3O4 geometry tailored KIT-6 and MCM-48 with different porosity were synthesized via reflux technique. Crystal geometry, morphology, molecular vibrations and pore structure were analyzed by X-Ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and Brunauer-Emmett-Teller (BET) method based N2 adsorption–desorption for the modified materials. As expected, MCM-48 micropore-dominated electrode exhibited higher specific capacitance (442.5 F/g) which is much superior to that of KIT-6 (88.9 F/g). Outstanding electrochemical execution is due to the mesoporous tailored architecture (average pore diameter of 6.1 nm) and synergistic contribution of MCM-48 architectured with a Co3O4 core. This promising electrode material opens up a new platform for high-performance supercapacitors.

The preparation and characterization results of a new nanocomposite, polyaniline (PANI) grafted multiwalled carbon nanotube (MWNT) loaded Nafion-silica, (designated as Nafion-silica/MWNT-g-PANI), are reported in this paper. The preparation involves the formation of a silica network in a Nafion membrane and the subsequent loading of polyaniline-grafted multiwalled carbon nanotubes (MWNT-g-PANI) onto the Nafion-silica nanocomposite. The new nanocomposite, Nafion-silica/ MWNT-g-PANI, was characterized as to its morphology, structure and properties. The conductivity and methanol permeability of the nanocomposite membranes were evaluated.