Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 304, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.127352
Keywords
Square disks-based crossed architectures; SnO2; Hydrothermal; Ethanol gas; Sensor; DFT
Funding
- Ministry of Education, Kingdom of Saudi Arabia under Promising Centre for Sensors and Electronic Devices (PCSED) at Najran University, Kingdom of Saudi Arabia [PCSED-09-18]
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A facile synthesis and characterization of square disks-based crossed architectures of SnO2 are reported in this paper. The prepared crossed architectures of SnO2 were analyzed by different techniques to study their structural, morphological, crystalline, optical, vibrational and scattering properties. From FESEM analysis an average length of the side and width of the square disks shaped structures were similar to 4-5 mu m and 1.0 +/- 0.2 mu m, respectively. Pure tetragonal rutile phase and crystallite size of 38.26 nm were confirmed by XRD studies. A single welldefined exciton peak at 373 nm corresponding to the energy band gap of 3.33 eV was observed from UV-vis spectrum. SnO2 square disks-based crossed architecture based gas sensor showed gas responses of 70.5, 107.5 and 110.9 at operating temperatures of 350, 400 and 450 degrees C, respectively. The response time of 2 s and recovery time of 2018 s, 1081 s, and 708 s were observed for ethanol gas at 350, 400 and 450 degrees C, respectively. Herein, the interaction between ethanol and SnO2 is simulated by Density functional theory (DFT) calculations. B3LYP/LanL2dz level of theory was employed in this study. It was found that the sensitivity of SnO2 sensor to ethanol molecule may be attributed to the depositing of an oxygen atom from the media to the SnO2 surface.
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