A novel gas sensor based on field ionization from ZnO nanowires: moderate working voltage and high stability

We report a kind of gas sensor using ZnO nanowires as the field ionization anode. The sharp tips of nanowires generate very high electric fields at relatively low voltages. The sensors show good sensitivity and selectivity. Moreover, the detection limitation of the field ionization based ZnO nanowire gas sensors is about 5%. More importantly, a sensor with ZnO nanowires as the anode exhibits an impressive performance with respect to stability and anti-oxidation behavior, which are significantly better than those of carbon nanotubes (CNTs) as electrodes. Therefore, the simple, low-cost, sensors described here could be deployed for a variety of applications.

[1]  Cheol Jin Lee,et al.  Organic vapour sensing by current response of porous silicon layer , 2001 .

[2]  Kong,et al.  Nanotube molecular wires as chemical sensors , 2000, Science.

[3]  H. Schulten.  Biochemical, medical, and environmental applications of field-ionization and field-desorption mass spectrometry , 1979 .

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

[5]  A. Castleman,et al.  Reverse field technique to study delayed ionization in time-of-flight mass spectrometry , 2002 .

[6]  Craig A. Grimes,et al.  A wireless, passive carbon nanotube-based gas sensor , 2002 .

[7]  X. Bai,et al.  Multiwall boron carbonitride/carbon nanotube junction and its rectification behavior. , 2007, Journal of the American Chemical Society.

[8]  Dejun Fu,et al.  The sensitivity of gas sensor based on single ZnO nanowire modulated by helium ion radiation , 2007 .

[9]  Q. Chen,et al.  Electron field emission characteristics and field evaporation of a single carbon nanotube. , 2005, The journal of physical chemistry. B.

[10]  Zhong Lin Wang,et al.  In situ imaging of field emission from individual carbon nanotubes and their structural damage , 2002 .

[11]  Xingzhong Zhao,et al.  Structural, photoluminescence, and field emission properties of vertically well-aligned ZnO nanorod arrays , 2007 .

[12]  J. C. Li,et al.  Investigation of the temperature dependence of the field emission of ZnO nanorods , 2007 .

[13]  Bingqing Wei,et al.  Miniaturized gas ionization sensors using carbon nanotubes , 2003, Nature.

[14]  Hailong Lu,et al.  Size Dependence of Gas Sensitivity of ZnO Nanorods , 2007 .

[15]  Zettl,et al.  Extreme oxygen sensitivity of electronic properties of carbon nanotubes , 2000, Science.

[16]  Q. Fu,et al.  Self-assembly of aligned ZnO nanoscrews: Growth, configuration, and field emission , 2005 .

[17]  Niraj Sinha,et al.  Carbon nanotube-based sensors. , 2006, Journal of nanoscience and nanotechnology.

[18]  J. Meek,et al.  Electrical breakdown of gases , 1953 .

[19]  J. C. Li,et al.  Field emission property improvement of ZnO nanowires coated with amorphous carbon and carbon nitride films , 2005 .

[20]  Yiying Wu,et al.  Room-Temperature Ultraviolet Nanowire Nanolasers , 2001, Science.

[21]  S. J. Kim,et al.  Gas sensors based on Paschen's law using carbon nanotubes as electron emitters , 2006 .