Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7147274 | Sensors and Actuators B: Chemical | 2014 | 7 Pages |
Abstract
This paper describes the fabrication of a Au@SnO2 core-shell structure using the sol gel method to manufacture the sensing materials. The properties of the sensing material were analyzed with UV-vis spectra, Fourier transform infrared spectroscopy, and transmission electron microscopy. The SnO2 material showed no response, whereas 1Â wt% Au/SnO2 exhibited a 2.4 sensor response. The response t90 (for a result equaling 90% of the equilibrium signal) and recovery tr90 (to adjust the signal to 90% background signal) times of the 1Â wt% Au/SnO2 material measured 240Â s and 210Â s, respectively. Au@SnO2 further enhanced the sensor response to 2.9 while reducing the response and recovery times to 80Â s and 62Â s. This study also demonstrates a formaldehyde gas-sensing mechanism involving HCHO adsorption and surface reaction and product desorption.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Feng-Chao Chung, Ren-Jang Wu, Fu-Chou Cheng,