Synthesis and characterization of Gd-doped SnO2 nanostructures and their enhanced gas sensing properties
Source abstract
Abstract
Abstract In the present work, we report the influence of Gd-doping on structural, optical and gas sensing properties of SnO 2 nanoparticles. X-ray diffraction (XRD) and Raman spectroscopy studies confirmed formation of tetragonal rutile type structure of both undoped and Gd-doped SnO 2 nanoparticles. The crystallite size has been found to decrease with increase in dopant concentration which was confirmed from XRD and TEM techniques. It has been observed that Raman surface modes are directly related to the surface area of nanoparticles. Photoluminescence (PL) spectroscopy confirmed large number of oxygen vacancies in 3% Gd-doped SnO 2 nanoparticles. It has been observed that 3% doped sensor displayed exceptionally large sensor response towards ethanol which is about 27 times larger than that of undoped sensor. The optimum operating temperature of doped sensors has reduced as compared to undoped sensor. The enhanced sensor response of Gd-doped nanoparticles has been attributed to small crystallite size, large number of oxygen vacancies, high surface basicity and increased contribution of Raman surface modes. Moreover, it has been observed that 3% Gd doped SnO 2 nanoparticle sensor is highly selective towards ethanol.
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Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Advanced Chemical Sensor Technologies · ZnO doping and properties
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