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Enhanced CO sensitivity and selectivity of gold nanoparticles-doped SnO2 sensor in presence of propane and methane

Bahrami, B ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1016/j.snb.2008.02.034
  3. Publisher: 2008
  4. Abstract:
  5. We report the effect of gold nanoparticles on the sensitivity and selectivity of SnO2-based sensors for detection of CO in the presence of methane and C3H8, a model compound representing liquid petroleum gas (LPG). 1.0 wt% Au/SnO2 powder was prepared by a co-precipitation method. The powder formed was washed, dried at 150 °C, and calcined at 300 °C for 3 h. The BET surface area of SnO2 and Au/SnO2 was measured to be 210 and 110 m2/g, corresponding to 4 and 7.5 nm loose spherical particles, respectively. Responses of the Au/SnO2 and SnO2 sensors to 40-1000 ppm CO, 0.2-1.0% C3H8 and 1.0-3.0% CH4 were studied at 170-300 °C in an automated gas sensing system. In this temperature range, the Au/SnO2 sensor is about 4-17 and 7-20 times more selective to 0.1% CO in the presence of 1.0% propane and 3.0% methane, respectively. Highly dispersed gold nanoparticles may be responsible for the enhanced sensitivity and selectivity of the Au/SnO2 sensor to CO. © 2008 Elsevier B.V. All rights reserved
  6. Keywords:
  7. Gold ; Nanoparticles ; Nanostructures ; CO sensitivity ; Gold nanoparticles (nano-Au) ; Nanostructured materials
  8. Source: Sensors and Actuators, B: Chemical ; Volume 133, Issue 1 , 26 July , 2008 , Pages 352-356 ; 09254005 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0925400508001573