Preparation and gas-sensing properties of thermally stable mesoporous SnO2

Preparation of porous tin dioxide powder by ultrasonic spray pyrolysis and their application to sensor materials

“…These specimens showed relatively smaller SSA than that of mesoporous SnO 2 powder prepared from Na 2 SnO 3 as a tin source and cetyltrimethylchloride as a mesopore template (ca. 300 m 2 g -1 after calcination at 600°C for 5 h) [3,4] Fig. 5(a)), formation of macropores at the surface of SnO 2 powder was obscure due to formation of many SnO 2 nanoparticles, which have already been observed around pr-SnO 2 (d)1100 powder in Fig.…”

“…Therefore, we have so far demonstrated the optimization of nanoand micro-structure of the sensors by utilizing various techniques. For example, the introduction of ordered mesoporous structure into SnO 2 powder was found to be very effective for controlling the gas diffusivity and reactivity [3][4][5][6]. Chemical surface modification of SnO 2 powder with some kinds of alkoxysilanes was also found to be very promising as a technique for getting high performance sensors, because the gas diffusivity and potential barrier height among SnO 2 grains could be controlled precisely [7][8][9][10].…”

Effects of microstructure of mesoporous SnO2 powders on their H2 sensing properties

“…They showed much larger specific surface areas (>300 m 2 g -1 even after calcination at 600ºC) than a conventional SnO 2 powder [9][10][11].…”

Material Design for Metal Oxide Chemiresistive Gas Sensors

“…Unfortunately, every material used for mesoporous, macroporous and hollow staructures fabrication requires specific approach to resolving. For example, Shimizu and co-workers [82] found that the most important key to the drastic improvement of thermal stability of mesoporous (m-) SnO 2 powders is to immerse them in a phosphoric acid aqueous solution before calcination and consequently loading of phosphorous-components on the surface of m-SnO 2 crystallites. Such treatment enabled to prepare the m-SnO 2 powders with small crystallite size (2~3 nm in diameter) and large specific surface area (>300 m 2 /g) even after calcination at 600ºC.…”