Spray rate effects on the NO₂gas sensor properties of Ni-doped SnO₂nanoflakes

Abstract

Nickel-doped Tin dioxide (NSO) nanostructured thin films were deposited using chemical spray pyrolysis at 450°C at various spray rates. The structural, morphological, and optical properties of the prepared nanostructured thin films were investigated to determine the effect of these parameters on the sensing properties of NSO film. X-ray diffraction revealed a polycrystalline structure with an increasing crystallite size as the deposition rate increased, which resulted in a gradual decrease in the bandgap. The FE-SEM images demonstrate that the deposition rate significantly influences the surface morphology and gas sensitivity performance. The sensitivity of the NO2 gas sensor fabricated employing NSO thin films increased as the deposition rate, and NO2 concentration was increased. At an optimal sensing temperature of 373 K, the maximum sensitivity was 120%, with a response and recovery time of 17 and 19 seconds, respectively.

A review on tin dioxide gas sensor: The role of the metal oxide doping, nanoparticles, and operating temperatures

“…Tin (IV) Oxide (SnO2) is an n-type transparent semiconductor with a wide bandgap of 3.6 eV at 300 K [12,13]. SnO2 is used in a wide variety of applications, including photovoltaic devices [14][15][16][17][18], biological applications [19][20][21][22][23], solar cells [24][25][26][27][28], electrochemical applications [29][30][31], and gas sensors [32][33][34][35][36][37]. Due to its high sensitivity to reducing and oxidizing gases such as CO, H2, and NO, tin oxide is commonly employed in gas sensor applications.…”

Enhancing Structural Integrity, Optical Properties, and Room Temperature Formaldehyde Sensing Through Optimized Spray Deposition Rates

“…Gaikwad et al, 22 nanocrystalline ZnO films were deposited using spray pyrolysis and studied the effect of gas flow rate ranging from 3 litres per minute (lpm) to 7 lpm. Qutaiba A. Abduljabbar et al, 23 Ni-doped SnO 2 films were prepared via chemical spray method at 450 °C with varying spray rates of 0.8, 1, 1.33, and 2 ml min −1 for the detection of NO 2 at operating temperature 100 °C. Hence, this study focuses on thoroughly analysing the structural, morphological, optical, and gas sensing characteristics of TiO 2 films with varying deposition rates 1 to 2.5 ml min −1 .…”