[1] [1] Zhang Y, Liu J H, Liu W H, et al. Study of gas sensor with carbon nanotube film on the substrate of porous silicon[C]//14th Intl Vac Microelectron Conf, 2001: 13-14.

[2] [2] Zhang Y, Liu J H, Li X, et al. Study of improving identification accuracy of carbon nanotube film cathode gas sensor[J]. Sens Actuators, A, 2005, 125(15): 15-24.

[3] [3] Kermany A R, Mohamed N M, Singh B S M. Characterization of aligned MWCNT′s array as the sensing element for ionization gas sensor[J]. J Appl Sci, 2011, 11: 1243-1248.

[4] [4] Cai S B, Zhe M D, Zhang Y. Flammable and noxious gas sensing using a microtripolar electrode sensor with diameter and chirality sorted single-walled carbon nanotubes[J]. J Micromech Microeng, 2013, 23: 085022.

[5] [5] Zhang Y, Li S T, Zhang J Y, et al. High-performance gas sensors with temperature measurement[J]. Scientific Reports, 2013, 3: 1267-1273.

[6] [6] Zhang Y, Wang J, Wang Y H, et al. A Carbon nanotube film gas sensor and fabrication method: China, 201110037965.4[P]. 2012.

[7] [7] Zhang Y, Zhang J Y, Song X H, et al. Carbon nanotube film triple-electrode sensor array and detection method of gas mixture, China: 201110039018.9[P]. 2012.

[8] [8] Li X, Liu J H, Dou J Y, et al. Improvement of purity and field emission character of carbon nanotubes film by optimizing the density of the catalyst solution[J]. Journal of Xi′an Jiaotong Univ, 2002, 36: 1041-1044.

[9] [9] Stone M. Cross-validatory choice and assessment of statistical predictions[J]. J Royal Stat Soc Series B (Methodological), 1974, 36: 111-147.

[10] [10] Kennedy J, Eberhart R C. Particle swarm optimization[C]// IEEE International Conference on Neural Networks, 1995: 1942-1948.