The Effect of Density and Surface Area on Carbon Nanotube Capacitive Sensors for Dimethyl Methylphosphonate Detection
Capacitive sensors for dimethyl methylphosphonate (DMMP) detection were prepared on interdigitated electrodes by airbrush process.Multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) were used as the chemically sensitive materials,respectively.Different airbrush carbon nanotube thin films were observed and compared by field-emission scanning electron microscope.It indicated that the capacitance of airbrush MWNT sensor decreased immediately when exposed to DMMP and recovered rapidly when removed DMMP in the range of 12-60 mg/m3 (2.4-12 ppm).The sensitivity of airbrush MWNT sensor was about -1.39% at the concentration of 12 mg/m3 (2.4 ppm).It was obvious that the capacitance sensitivity was higher when the MWNTs were more and the film was denser by airbrush.It was also found that the capacitance sensitivity of airbrush SWNT sensor was higher than the corresponding airbrush MWNT sensor.
Carbon nanotubes Dimethyl methylphosphonate Capacitance Density Surface area Airbrush
Hong Jun Jing Ya Dong Jiang Xiao Song Du
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China(UESTC), Chengdu 610054,Peoples Republic of China
国际会议
广州
英文
519-522
2012-11-16（万方平台首次上网日期，不代表论文的发表时间）