Receptor function of small semiconductor crystals with clean and electron-traps dispersed surfaces

Abstract Theoretical exploration has been conducted to formulate the receptor function and response of a semiconductor gas sensor using thin plate-like crystals. The receptor function can be formulated over a wide range of depletion from conventional one (regional depletion) to new type one (volume depletion) by focusing attention on how the surface density of adsorbed oxygen ions (O − ) is related with chemical moiety outside the crystals and physical moiety inside. The responses to gases thus derived are inversely proportional to the thickness of the plates used in the range of volume depletion. Electron-traps, if dispersed on the crystals, are shown to exert drastic effects in promoting sensitivity to gases.

[1]  Masahiro Nishikawa,et al.  Hall measurement studies and an electrical conduction model of tin oxide ultrafine particle films , 1982 .

[2]  Noboru Yamazoe,et al.  Effects of additives on semiconductor gas sensors , 1983 .

[3]  Koji Moriya,et al.  Indium oxide-based gas sensor for selective detection of CO , 1996 .

[4]  Th. Wolkenstein,et al.  The Electron Theory of Catalysis on Semiconductors , 1960 .

[5]  Yigal Komem,et al.  The effect of grain size on the sensitivity of nanocrystalline metal-oxide gas sensors , 2004 .

[6]  Noboru Yamazoe,et al.  Toward innovations of gas sensor technology , 2005 .

[7]  Kengo Shimanoe,et al.  Theory of gas-diffusion controlled sensitivity for thin film semiconductor gas sensor , 2001 .

[8]  W. Jost,et al.  Physical Chemistry, An Advanced Treatise , 1974 .

[9]  Norio Miura,et al.  Sensing behavior of CuO-loaded snO2 element for H2S detection , 1991 .

[10]  N. Bârsan,et al.  Conduction Model of Metal Oxide Gas Sensors , 2001 .

[11]  A. Rothschild,et al.  On the Relationship Between the Grain Size and Gas-Sensitivity of Chemo-Resistive Metal-Oxide Gas Sensors with Nanosized Grains , 2004 .

[12]  Norio Miura,et al.  Gold-Loaded Tungsten Oxide Sensor for Detection of Ammonia in Air. , 1992 .

[13]  Norio Miura,et al.  Role of Additives on Alcohol Sensing by Semiconductor Gas Sensor , 1989 .

[14]  M. Madou,et al.  Chemical Sensing With Solid State Devices , 1989 .

[15]  Tadashi Takada,et al.  Highly sensitive ozone sensor , 1993 .

[16]  N. Bârsan,et al.  Conduction models in gas-sensing SnO2 layers: grain-size effects and ambient atmosphere influence , 1994 .

[17]  Chao-Nan Xu,et al.  Grain size effects on gas sensitivity of porous SnO2-based elements , 1991 .

[18]  Kengo Shimanoe,et al.  Roles of Shape and Size of Component Crystals in Semiconductor Gas Sensors I. Response to Oxygen , 2008 .

[19]  Kengo Shimanoe,et al.  Roles of Shape and Size of Component Crystals in Semiconductor Gas Sensors , 2008 .

[20]  Joachim Maier,et al.  Chemical diffusion of oxygen in tin dioxide , 2001 .

[21]  P. B. Weisz,et al.  Effects of Electronic Charge Transfer between Adsorbate and Solid on Chemisorption and Catalysis , 1953 .

[22]  T. Doll,et al.  A rate equation approach to the gas sensitivity of thin film metal oxide materials , 2005 .

[23]  Kengo Shimanoe,et al.  Contribution of electron tunneling transport in semiconductor gas sensor , 2007 .

[24]  G. Korotcenkov.  The role of morphology and crystallographic structure of metal oxides in response of conductometric-type gas sensors , 2008 .

[25]  Cox,et al.  Oxygen vacancies and defect electronic states on the SnO2(110)-1 x 1 surface. , 1988, Physical review. B, Condensed matter.