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Solvothermal Synthesized In2O3 Nanoparticles for ppb Level H2S Detection

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In2O3 nanoparticles were prepared by solvothermal method. The structural properties and morphologies of the as-prepared product were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the obtained product was indexed to cubic structure In2O3 with an average crystallite size of 28.06 nm. The UV-light property was studied, which showed that the current of the sensor increased at least 5 orders of magnitude when the sensor was placed in the presence of the maximum UV irradiation (365 nm, 0.531 mW/cm2 ). The optimal operating temperature of the sensor was determined to 250 °C, the sensor's detection limit towards H2S was as low as 5 ppb at 250 °C. The response time and the recovery time was 2.7 min and 3.8 min at the concentration of 5 ppb, respectively. Moreover, the In2O3 nanoparticles showed a certain selective detection to H2S compared with the other gases, such as NO2, H2, NH3, CO and C2H6O. Finally, the sensing mechanism of the sensor towards H2S was also discussed.
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Document Type: Short Communication

Publication date: June 1, 2015

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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