structural stability and performance of noble metal-free sno2-based gas sensors高贵的结构稳定性和性能的非金属sno2-based气体传感器.pdfVIP

Biosensors 2012, 2, 221-233; doi:10.3390/bios2020221 OPEN ACCESS biosensors ISSN 2079-6374 /journal/biosensors/ Article Structural Stability and Performance of Noble Metal-Free SnO -Based Gas Sensors 2 Antonio Tricoli Department of Mechanical and Process Engineering, ETH Zurich, CH-8092 Zurich, Switzerland; E-Mail: atricoli@ethz.ch; Tel.: +41-44-632-8503; Fax: +41-44-632-1276 Received: 22 April 2012; in revised form: 18 May 2012 / Accepted: 25 May 2012 / Published: 29 May 2012 Abstract: The structural stability of pure SnO nanoparticles and highly sensitive SnO -SiO 2 2 2 nanocomposites (0–15 SiO2 wt%) has been investigated for conditions relevant to their utilization as chemoresistive gas sensors. Thermal stabilization by SiO2 co-synthesis has been investigated at up to 600 °C determining regimes of crystal size stability as a function of SiO -content. For operation up to 400 °C, thermally stable crystal sizes of ca. 24 and 2 11 nm were identified for SnO nanoparticles and 1.4 wt% SnO -SiO nanocomposites, 2 2 2 respectively. The effect of crystal growth during operation (TO = 320 °C) on the sensor response to ethanol has been reported, revealing possible long-term destabilization