P1GS.10 - Improving the Gas Sensing Performance Based on Ordered Mesoporous Pd/SnO2 Sensor

17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria
P-1 - Gas Sensors
J. Zhao, L. Li, X. Yu - College of Electrical and Electronic Engineering, Changchun University of Technology, Changchun (China), G. Lu - College of Electronic Science and Engineering, Jilin University, Changchun (China), H. Chen - College of Communication Engineering, Jilin University, Changchun (China)
538 - 538


Ordered mesoporous Pd/SnO2 nanomaterials with different amounts of Pd (0.1, 0.2, 0.5 and 1 wt%) have been successfully synthesized by hard template method using the hexagonal mesoporous SBA-15 as a template. Low angle XRD patterns of pure mesoporous SnO2 and Pd/SnO2 exhibit wellresolved diffraction peaks, implying their ordered mesostructure. TEM image of 0.2% Pd/SnO2 shows a long-range periodic order mesochannel in agreement with XRD result. A study on their gas sensing properties for H2 reveals that the sensor utilizing Pd/SnO2 displays much higher sensitivity to H2 compared to those based on pure mesoporous SnO2. The maximum response of 0.2% Pd/SnO2 sensor reaches to 151 at 250℃ to 1000 ppm H2, which is 10 times larger than that of the pure SnO2 sensor (at 300 ℃). The outstanding performance of the mesoporous Pd/SnO2 sensor arises from the ordered mesostructure, large surface area and well dispersion of Pd, which lead to highly effective surface reaction between gas molecules and the chemically adsorbed oxygen on the SnO2 surface.