Preparation of Mesoporous and Meso-macroporous SnO2 Powders and Application to H-2 Gas Sensors

作者：Yuan Luyang; Hyodo Takeo; Shimizu Yasuhiro^*; Egashira Makoto

来源：Sensors and Materials, 2009, 21(5): 241-250.

DOI：10.18494/sam.2009.614

• tin dioxide
• mesopore
• macropore
• gas sensor

Mesoporous SnO2 (mp-SnO2) and meso-macroporous SnO2 (m center dot mp-SnO2) pellet-type gas sensors were fabricated by the sol-gel method employing SnCl4 center dot 5H(2)O as a Sn source. The mesoporous structure was controlled by C20H37O7SNa, while the macroporous structure was controlled by polymethylmethacrylate (PMMA) microspheres. The introduction of macropores by the addition of PMMA microspheres into mp-SnO2 tends to increase the pore diameter and crystallite size. The large amount of macropores introduced into mp-SnO2 sensors by the addition of PMMA microspheres in the preparation process significantly increased the resistance of all the sensors. Among all those tested, the mp-SnO2 sensor with only 5 wt% Sb2O5 added exhibited the largest response at 400 degrees C. The 70% response and recovery times could be reduced by the introduction of macropores.

• 出版日期2009