Gas sensing application of nanocrystalline zinc oxide thin films prepared by spray pyrolysis

Abstract

Nanocrystalline oxygen-deficient ZnO thinfilm sensors were prepared by spray pyrolysis technique using zinc acetate dissolved in propanol and water as precursor. Response of the sensor to target gases NO 2 and H 2 S is studied. At optimum temperature of 200 • C, the sensors have a response of 3.32 to 7 ppm NO 2 and 1.4 to 18 ppm of H 2 S gas. The analytical characterizations of the prepared sensors were performed using X-ray diffraction measurement, scanning electron microscopy, energy-dispersive X-ray spectroscopy and Raman spectroscopy. Dynamic response of sensors to different concentrations of NO 2 and H 2 S gas was tested at optimum temperature. Experimental data revealed the sensors to be more selective to NO 2 gas with satisfactory response and recovery time.

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

“…Figure 16 shows the sensor array which mainly consists of a target gas, a multi-component gas mixer, a mass flow controller unit, a testing chamber, a power supplier and heaters, and an electrometer for resistance measurement [121, 135–138]. LabVIEW-based software is mainly used to control all testing parameters and measurements during the experiment.…”

Doping‐induced diffused phase transition triggers gas‐sensing performance of Sn‐doped BaTiO3 nanostructures

“…DOS results were studied as a function of energy levels. To do the computational study, the super cell of the pristine and Sn-doped BaTiO 3 was created using the NiO nanosheet Hydrothermal 0.8 at 20 250 [32] WO 3 nanowires Vapor transport 7.8 at 5 200 [33] WO 3 nanowires Thermal evaporation 146 at 10 250 [34] ZnO nanocrystalline Spray pyrolysis 3.32 at 7 200 [35] ZnO nanoneedles Chemical 0.89 at 200 200 [36] SnO 2 thin film Sol-gel spin coating 0.019 at 200 [37] SnO 2 nanoribbons Thermal deposition 1.16 at 3 Room temperature [38] Monodispersed Nb 2 O 5 Solvothermal 2 at 5 450 [39] In 2 O 3 /SnS 2 composite High-stability triboelectric nanogenerator 15 at 50 Room temperature [40] XCRYSDEN and BURAI suite. The super cell was created using BURAI 1.3 (GUI for Quantum Espresso) with scaling 2 Â 2 Â 2, which is further modified as a slab system along (100) direction of miller index per angstrom on 10 units.…”