Carbon nanotube-based gas sensors

Zhang, T., Mubeen, S., Bekyarova, E., Yoo, B. Y, Haddon, R. C., Myung, N. V. and Deshusses, M. A. (2007), Poly(m-aminobenzene sulfonic acid) functionalized single-waUed carbon nanotubes based gas sensor , Nanotechnology, 18, 165504.1-165504.1. 

Wang, Y. and Yeow, J. T. W. (2009) A Review of Carbon Nanotubes-Based Gas Sensors. Journal of Sensors, 1-24. 

Chang YW, Oh JS, Yoo SH, Choi HH, Yoo K-H (2007) Electrically refreshable carbon nanotube-based gas sensors. Nanotechnology 18 435504... 

Wang Y, Yeow JTW (2009) A review of carbon nanotubes-based gas sensors. J Sens 2009 1-24... 

Wongchoosuk, C., Wisitsoraat, A.,Tuantranont, A. and Kerdcharoen,T. (2010) Portable electronic nose based on carbon nanotube-Sn02 gas sensors and its application for detection of methanol contamination in whiskeys , Sens. Actuat. B, 147,392-9. 

Gas sensors based on field ionization from multiwall carbon nanotube arrays grown on PSi templates have been developed (Nikfaijam et al., 2010). Such sensors showed good sensitivity, selectivity and short response times, as well as higher discharge current and good mechanical stability in comparison with those which were fabricated on polished silicon substrates. Validation of the compatibility between PSi-based gas sensor technology and standard microelectronic processes has been demonstrated (Barillaro etal.,2010). 

Bondavalli P, Legagneux P, Pribat D (2009) Carbon nanotubes based transistors as gas sensors state of the art and critical review. Sens Actuators B 140 304—318... 

With some reservations, CNTs-based FET sensors with bottom-gate configuration can also be attributed to TFT sensors. Carbon nanotubes (CNTs) are one-dimensional molecular structures, which demonstrate very high carrier mobility in field-effect transistors (Avouris et al. 2007). Carbon-based gas sensors will be discussed in detail in Chap. 1 (Vol. 2). In this chapter we will briefly analyze the prospects for CNTs in TFT-based gas sensor design. 

The following optimization of CNT-based gas sensors can be achieved through functionalization of carbon nanotubes (Qi et al. 2003 Bondavalli et al. 2009). For example. Shim et al. (2001) have shown that CNTFET functionalization by polyethyleneimine (PEI) considerably increases sensitivity to NO. The PEI coated CNTFETs showed a much higher sensitivity to NO compared to bare CNTFETs the CNTEET sensors could detect a concentration of 100 ppt and saturated at 3 ppb. This value of 100 ppt constitutes up to now the lowest gas concentration ever detected by a CNTFET gas sensor. This behavior is linked to the doping effect of high-density amines from the PEI molecules on carbon nanotubes. Information related to CNTs functionalization may also be found in Chap. 25 (Vol. 2) of this book. 

Bobacka J, Ivaska A (2010) Chemical sensors based on conducting polymers. In Cosnier S, Karyakin A (eds) Electropolymerization concepts, materials and applications. Wiley-VCH, Weinheim, pp 173-187 BondavaUi P, Legagneux P, Pribat D (2009) Carbon nanotubes based transistors as gas sensors state of the art and critical review. Sens Actuators B 140 304-318... 

There are very few papers on a sol—gel Al203-based gas sensor. Saha et al. [15] developed a capacitive himiidity sensor based on a porous AI2O3 membrane obtained from alumimun sec-butoxide, with a detection Umit of 3 ppm. The same research group developed an ammonia conductometric sensor based on nanocomposites made of AI2O3 and carbon nanotubes [16]. 

Valentini, L. Armentano, I. Kenny, J. M. Cantalini, C. Lozzi, L. Santucci, S. 2003. Sensors for sub-ppm N02 gas detection based on carbon nanotube thin films. Appl. Phys. Lett. 82 961-963. 

Star, A., Joshi, V., Skarupo, S., Thomas, D., Gabriel, J. C. P. 2006. Gas sensor array based on metal-decorated carbon nanotubes. J. Phys. Chem. B 110 21014-21020. 

Abstract This chapter focuses on the performances of gas sensors based on single-walled carbon nanotubes (SWCNTs).The chapter first reviews chemiresistor and field-effect transistor sensor architectures. Theoretical models based on doping effect and Schottky barrier modulation are correlated to the percolation of metallic carbon nanotubes. The functionalisation strategies of carbon nanotubes, used to acquire a gas selectivity, are discussed and offer promising application for the monitoring of air quality, or military and medical applications. 

Gas sensor based on single-walled carbon nanotube networks... 

Battle, Y., Ducloux, O., Thobois, E, Dorval, N., Lauret, J. S., Attal-Tretout, B. and Loiseau, A. (2011a), Gas sensors based on thick films of semi-conducting single walled carbon nanotubes . Carbon, 49,3544-52. 

Peng, N., Zhang, Q., Lee, Y. C.,Tan, O. K. and Marzari,N. (2008), Gate modulation in carbon nanotube field effect transistors-based NH3 gas sensors . Sensors And Actuators B, 132,191-5. 

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