Preparation of mesoporous and/or macroporous SnO2-based powders and their gas-sensing properties as thick film sensors.
Mesoporous and/or macroporous SnO(2)-based powders have been prepared and their gas-sensing properties as thick film sensors towards H(2) and NO(2) have been investigated. The mesopores and macropores of various SnO(2)-based powders were controlled by self-assembly of sodium bis(2-ethylhexyl)sulfosuccinate and polymethyl-methacrylate (PMMA) microspheres (ca. 800 nm in diameter), respectively. The introduction of mesopores and macropores into SnO(2)-based sensors increased their sensor resistance in air significantly. The additions of SiO(2) and Sb(2)O(5) into mesoporous and/or macroporous SnO(2) were found to improve the sensing properties of the sensors. The addition of SiO(2) into mesoporous and/or macroporous SnO(2) was found to increase the sensor resistance in air, whereas doping of Sb(2)O(5) into mesoporous and/or macroporous SnO(2) was found to markedly reduce the sensor resistance in air, and to increase the response to 1,000 ppm H(2) as well as 1 ppm NO(2) in air. Among all the sensors tested, meso-macroporous SnO(2) added with 1 wt% SiO(2) and 5 wt% Sb(2)O(5), which were prepared with the above two templates simultaneously, exhibited the largest H(2) and NO(2) responses.
Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan. d708057c@cc.nagasaki-u.ac.jp
Luyang
L
Yuan
Takeo
T
Hyodo
Yasuhiro
Y
Shimizu
Makoto
M
Egashira
D000965:Antimony / Q000032:analysis; D003460:Crystallization; D005740:Gases / Q000032:analysis*; D006859:Hydrogen / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000295:instrumentation* / Q000379:methods*; D009585:Nitrogen Dioxide / Q000032:analysis; D010087:Oxides / Q000032:analysis; D016062:Porosity; D011208:Powders; D013499:Surface Properties; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
D005740:Gases; D010087:Oxides; D011208:Powders; D017971:Tin Compounds; C091696:antimony oxide; D006859:Hydrogen; D000965:Antimony; C045358:stannic oxide; D009585:Nitrogen Dioxide