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No_x sensing characteristics of single wall carbon nanotube gas sensor prepared by pulsed laser ablation
by M.M.H. Bhuiyan, F. Mitsugi, T. Ueda, T. Ikegami
International Journal of Nanomanufacturing (IJNM), Vol. 4, No. 1/2/3/4, 2009
Abstract: A single-walled carbon nanotube (SWCNT) gas sensor was prepared by pulsed laser ablation. A graphite composite target rod containing nickel (Ni) and cobalt (Co) was used. The repetition rate and wavelength of the laser were 10 Hz and 532 nm, respectively. Laser fluence at the target surface was approximately 2.3 J/cm². The quartz tube was heated to 1273K by an electric furnace and filled with pure argon or nitrogen gas. The pressure and gas flow rate inside the quartz furnace were 500 Torr to 760 Torr and 100 sccm, respectively. The prepared CNTs were collected as bundled SWCNTs and were dispersed in the dimethylformamide solution. The prepared CNTs were characterised by scanning and transmission electron microscope and Raman spectroscopy. The CNTs were dispersed on an Al₂O₃ substrate to prepare the sensor. The prepared SWCNT sensors were used to detect NO and NO₂ gases using two terminal resistance methods based on the change in electrical resistance due to exposure to these gases. The sensor responded to a minimum concentration of 100 ppb NO₂ gas. The resistance gradient was calculated by the polynomial curve fitting of raw data and a relationship was found between resistance gradient and gas concentration.

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