Parts per Billion-Level H2S Detection at Room Temperature Based on Self-Assembled In2O3 Nanoparticles

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• 作者：Kun Yao ; Daniela Caruntu ; Zhongming Zeng ; Jiajun Chen ; Charles J. O’ ; Connor ; Weilie Zhou
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 20, 2009
• 年：2009
• 卷：113
• 期：33
• 页码：14812-14817
• 全文大小：346K
• 年卷期：v.113,no.33(August 20, 2009)
• ISSN：1932-7455

文摘

Homogenous In₂O₃ nanoparticles (NPs) with diameters in the range of 6−10 nm were synthesized via a chemical solution method, and nanoparticles were assembled on Si substrate for H₂S detection. The sensor demonstrates ultrahigh sensitivity to H₂S to part per billion (ppb) levels at room temperature. Different sensor parameters were then investigated in terms of electrode gap, In₂O₃ NP film thickness, and surface modification by noble metals. It was found that sensitivity was slightly improved by reducing the electrode gap or increasing NP film thickness. However, sensitivity was dramatically enhanced (from 20 ppm to 20 ppb) after surface modification with 0.3 nm Au deposition. In addition, the sensor also shows a certain selective detection to H₂S in comparison with other gases such as CO and NO₂.