Studies on Spray Pyrolised Nanostructured SnO₂ Thin Films for H₂ Gas Sensing Application

Abstract

The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO 2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrophotometer (EDAX). The information of crystallite size, dislocation density and microstrain is obtained from the full width-at half-maximum (FWHM) of the diffraction peaks. Effect of sprayed deposition temperature on H 2 gas sensing performance and electrical properties were studied using static gas sensing system. The sensor (T pyr . = 350 °C) showed high gas response (S = 1200 at 350 °C) on exposure of 500 ppm of H 2 and high selectivity against other gases The results are discussed and interpreted.

Effect of Fluorine Doping on Structural and Optical Properties of SnO<sub>2</sub> Thin Films Prepared by Chemical Spray Pyrolysis Method

“…If β hkl cosθ is plotted with respect to 4 sinθ for all peaks, strain and crystallite size can be calculated from the slope and yintercept of the fitted line respectively as shown in Figure (2). The crystallite size of all films is also calculated for (110) direction by Scherrer's formula [10]:…”

“…Where hν is the photon energy, α o is constant, and Eu is the Urbach energy which refers to the width of the exponential absorption edge. Figure (10) shows the variation of (lnα) versus photon energy for the films. The obtained E U values are given in Table (4).…”

Role of Polyvinylpyrrolidone (PVP) on Controlling the Structural, Optical, and Electrical Properties of Vanadium Pentoxide (V2O5) Nanoparticles

“…Crystallite sizes of nanoparticles were obtained by using the Debye-Scherrer equation 1. [37][38][39]…”

Ethanol-Sensing Characteristics of Tin Oxide (SnO2) Nano-Particle Thin Films Deposited Using Ultrasonic Nebulizer

“…The excellent gas sensing properties of tin oxide thin films have been reported by different researchers for different gases like CO, NO x , H 2 S, H 2 , CH 4 , C 2 H 5 OH and CNG etc. [3][4][5]. The different techniques have been utilizes in preparation of a good SnO 2 thin films like thermal evaporation [6][7], chemical vapor deposition [8][9], RF magnetron co-sputtering [10][11], Sol gel [12], Electro deposition [13][14], laser pulse evaporation [15][16] and spray pyrolysis [17][18][19][20].…”