SnO2 nanoslab as NO2 sensor: identification of the NO2 sensing mechanism on a SnO2 surface.

Among the various metal oxides, SnO2 has been most widely exploited as a semiconductor gas sensor for its excellent functionalities. Models illustrating the sensing mechanism of SnO2 have been proposed and tested to explain experimentally derived "power laws". The models, however, are often based on somewhat simplistic assumptions; for instance, the net charge transfer from an adsorbate to a sensor surface site is assumed to occur only by integer values independent of the crystallographic planes. In this work, we use layer-shaped SnO2 crystallites with one nanodimension (1ND-crystallites) as NO2 gas sensing elements under flat band conditions, and derive appropriate "power laws" by combining the dynamics of gas molecules on the sensor surface with a depletion theory of semiconductor. Our experimentally measured sensor response as a function of NO2 concentration when compared with the theoretically derived power law indicates that sensing occurs primarily through the chemisorption of single NO2 molecules at oxygen vacancy sites on the sensor surface.

[1]  Sang‐Woo Kim,et al.  General Route to Single-Crystalline SnO Nanosheets on Arbitrary Substrates , 2010 .

[2]  W. Milne,et al.  Low power consumption and high sensitivity carbon monoxide gas sensor using indium oxide nanowire. , 2010, Journal of nanoscience and nanotechnology.

[3]  S. Mathur,et al.  Plasma-Modified SnO2 Nanowires for Enhanced Gas Sensing , 2010 .

[4]  Qing Wang,et al.  Gas Sensors Based on Semiconducting Metal Oxide One-Dimensional Nanostructures , 2009, Sensors.

[5]  Pietro Siciliano,et al.  The Role of Surface Oxygen Vacancies in the NO2 Sensing Properties of SnO2 Nanocrystals , 2008 .

[6]  John Drennan,et al.  Highly sensitive and fast responding CO sensor using SnO2 nanosheets , 2008 .

[7]  Guowei Yang,et al.  Fabrication of a SnO2 Nanowire Gas Sensor and Sensor Performance for Hydrogen , 2008 .

[8]  Young-Jin Choi,et al.  Novel fabrication of an SnO2 nanowire gas sensor with high sensitivity , 2008, Nanotechnology.

[9]  Kengo Shimanoe,et al.  Theory of power laws for semiconductor gas sensors , 2008 .

[10]  Jordi Arbiol,et al.  High response and stability in CO and humidity measures using a single SnO2 nanowire , 2007 .

[11]  M. Batzill,et al.  Surface Science Studies of Gas Sensing Materials: SnO2 , 2006, Sensors (Basel, Switzerland).

[12]  P. Siciliano,et al.  Nanocrystalline Metal Oxides from the Injection of Metal Oxide Sols in Coordinating Solutions: Synthesis, Characterization, Thermal Stabilization, Device Processing, and Gas‐Sensing Properties , 2006 .

[13]  Meilin Liu,et al.  A highly sensitive and fast-responding SnO2 sensor fabricated by combustion chemical vapor deposition , 2005 .

[14]  Chongwu Zhou,et al.  Detection of NO2 down to ppb levels using individual and multiple In2O3 nanowire devices , 2004 .

[15]  Chenglu Lin,et al.  Fabrication and ethanol sensing characteristics of ZnO nanowire gas sensors , 2004 .

[16]  Vincenzo Guidi,et al.  Electrical Properties of Tin Dioxide Two-Dimensional Nanostructures , 2004 .

[17]  Younan Xia,et al.  A solution-phase, precursor route to polycrystalline SnO2 nanowires that can be used for gas sensing under ambient conditions. , 2003, Journal of the American Chemical Society.

[18]  Peidong Yang,et al.  SnO2 Nanoribbons as NO2 Sensors: Insights from First Principles Calculations , 2003 .

[19]  Martin Moskovits,et al.  Detection of CO and O2 Using Tin Oxide Nanowire Sensors , 2003 .

[20]  H. Xiong,et al.  Elucidating the conductivity enhancement effect of nano-sized SnO2 fillers in the hybrid polymer electrolyte PEO–SnO2–LiClO4 , 2003 .

[21]  Giorgio Sberveglieri,et al.  Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts , 2002 .

[22]  Peidong Yang,et al.  Photochemical sensing of NO(2) with SnO(2) nanoribbon nanosensors at room temperature. , 2002, Angewandte Chemie.

[23]  Zhong Lin Wang,et al.  Growth and structure evolution of novel tin oxide diskettes. , 2002, Journal of the American Chemical Society.

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

[25]  A. Zaban,et al.  Controlling the Particle Size of Calcined SnO2 Nanocrystals , 2001 .

[26]  E. Longo,et al.  Sintering of tin oxide and its applications in electronics and processing of high purity optical glasses , 2001 .

[27]  Y. Liu,et al.  Nanosized tin oxide as the novel material with simultaneous detection towards CO, H2 and CH4 , 2000 .

[28]  N. Barsan,et al.  Fundamental and practical aspects in the design of nanoscaled SnO2 gas sensors: a status report , 1999 .

[29]  T. Becker,et al.  Gas-kinetic interactions of nitrous oxides with SnO2 surfaces , 1998 .

[30]  V. Lantto,et al.  Computational approaches to the chemical sensitivity of semiconducting tin dioxide , 1998 .

[31]  X. Yao,et al.  Structural and gas-sensing properties of nanometre tin oxide prepared by PECVD , 1996 .

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

[33]  H. V. Shurmer,et al.  Integrated tin oxide sensors of low power consumption for use in gas and odour sensing , 1993 .

[34]  Norio Miura,et al.  Tungsten Oxide-Based Semiconductor Sensor Highly Sensitive to NO and NO2 , 1991 .

[35]  M. Haradome,et al.  Temperature dependence of Rresistivities of SnO2-based gas sensors exposed to Co, H2, and C3H8 gases , 1980 .

[36]  D J Fabian,et al.  The Chemical Physics of Surfaces , 1978 .

[37]  J. P. Marton,et al.  Physical Properties of SnO2 Materials II . Electrical Properties , 1976 .

[38]  Ying Liu,et al.  Growth of Aligned Square‐Shaped SnO2 Tube Arrays , 2005 .

[39]  Z. Gergintschew,et al.  Two-dimensional numerical simulation of semiconductor gas sensors , 1995 .