Multi-walled carbon nanotube (MWCNT) film has been fabricated onto Pt-patterned alumina substrates using the chemical vapor deposition method for NH 3 gas sensing applications. The MWCNT-based sensor is sensitive to NH 3 gas at room temperature. Nanoclusters of Co catalysts have been sputtered on the surface of the MWCNT film to enhance gas sensitivity with respect to unfunctionalized CNT films. The gas sensitivity of Co-functionalized MWCNT-based gas sensors is thus significantly improved. The sensor exhibits good repeatability and high selectivity towards NH 3, compared with alcohol and LPG.
References
[1]
Devi, G.S.; Subrahmanyam, V.B.; Gadkari, S.C.; Gupta, S.K. NH3 gas sensing properties of nanocrystalline ZnO based thick films. Anal. Chem. Acta 2006, 568, 41–46.
[2]
Thong, L.V.; Loan, L.T.N.; Hieu, N.V. Comparative study of gas sensor performance of SnO2 nanowires and their hierarchical nanostructures. Sens. Actuators B 2010, 150, 112–119.
[3]
Huang, J.R.; Wang, J.H.; Gu, C.P.; Yu, K.; Meng, F.L.; Liu, J.H. A novel highly sensitive gas ionization sensor for ammonia detection. Sens. Actuators A 2009, 150, 218–223.
[4]
Chen, Y.; Menga, F.L.; Li, M.Q.; Liu, J.H. Novel capacitive sensor: Fabrication from carbon nanotube arrays and sensing property characterization. Sens. Actuators B 2009, 140, 396–401.
[5]
Suehiro1, J.; Zhou, G.; Hara, M. Fabrication of a carbon nanotube-based gas sensor using dielectrophoresis and its application for ammonia detection by impedance spectroscopy. J. Phys. D Appl. Phys. 2003, 36, L109–L114.
[6]
Paolo, B.; Pierre, L.; Didier, P. Carbon nanotubes based transistors as gas sensors: State of the art and critical review. Sens. Actuators B 2009, 140, 304–318.
Radouane, L.; Roman, P.; Alexandre, F.; Alexey, V.; Carles, C.; Isabel, G.; Jean-Jacques, P.; Eduard, L. Gas sensors based on multiwall carbon nanotubes decorated with tin oxide nanoclusters. Sens. Actuators B 2010, 145, 411–416.
[9]
Sharma, S.K.; Sengupta, S.; Islam, S. Deposition of Pristine and functionalized MWCNTs in alumina matrix by sol-gel technique and investigation of their ammonia sensing properties. Nanomater. Nanotechnol. 2012, 2, 1–6.
[10]
Kaneto, K.; Tsuruta, M.; Sakai, G.; Cho, W.Y.; Ando, Y. Electrical conductivities of multi-wall carbon nanotubes. Synth. Met. 1999, 103, 2543–2546.
[11]
Varghese, O.K.; Kichambre, P.D.; Gong, D.; Ong, K.G.; Dickey, E.C.; Grimes, C.A. Gas sensing characteristics of multi-wall carbon nanotubes. Sens. Actuators B 2001, 81, 32–41.
[12]
Nguyen, V.H.; Luong, T.B.T.; Nguyen, D.C. Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite. Sens. Actuators B 2008, 129, 888–895.
[13]
Arab, M.; Berger, F.; Picaud, F.; Ramseyer, C.; Glory, J.; Mayne-L'Hermite, M. Direct growth of the multi-walled carbon nanotubes as a tool to detect ammonia at room temperature. Chem. Phys. Lett. 2006, 433, 175–181.
Faizah, M.Y.; Fakhru'l-Razi, A.; Sidek, R.M.; Liew, A.A.G. Gas sensor application of carbon nanotubes. Int. J. Eng. Technol. 2007, 4, 106–113.
[18]
Kong, J.; Chapline, M.G.; Dai, H. Functionalized carbon nanotubes for molecular hydrogen sensors. Adv. Mater. 2001, 13, 1384–1386.
[19]
Star, A.; Joshi, V.; Skarupo, S.; Thomas, D.; Gabriel, J.C.P. Gas sensor array based on metal-decorated carbon nanotubes. J. Phys. Chem. B 2006, 110, 21014–21020.
[20]
Gelamo, R.V.; Rouxinol, F.P.; Verissimo, C.; Vaz, A.R.; de Moraes, M.A.; Moshkalev, B.S.A. Low-temperature gas and pressure sensor based on multi-wall carbon nanotubes decorated with Ti nanoparticles. Chem. Phys. Lett. 2009, 482, 302–306.
[21]
Ionescu, R.; Espinosa, E.H.; Sotter, E.; Llobet, E.; Vilanova, X.; Correig, X.; Felten, A.; Bittencourt, C.; Van Lier, G.; Charlier, J.-C.; et al. Oxygen functionalisation of MWCNT and their use as gas sensitive thick-film layers. Sens. Actuators B 2006, 113, 36–46.
