Carbon Nanotube Sensors for Gas and Organic Vapor Detection

• DOI: 10.1021/nl034220x
• Publication Date: 2003-07-09T05:15:58Z
• Authors: Jing Li; Yijiang Lu; Qi Ye; Martin Cinke; Jie Han; M. Meyyappan
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

A gas sensor, fabricated by the simple casting of single-walled carbon nanotubes (SWNTs) on an interdigitated electrode (IDE), is presented for and organic vapor detection at room temperature. The sensor responses are linear concentrations sub ppm to hundreds with limits 44 ppb NO2 262 nitrotoluene. time order seconds response minutes recovery. variation sensitivity less than 6% all tested devices, comparable commercial metal oxide or polymer microfilm sensors while retaining room-temperature high SWNT transistor manufacturability sensors. extended capability from vapors attributed direct charge transfer individual semiconducting conductivity additional electron hopping effects intertube through physically adsorbed molecules between SWNTs.