Nanotube Molecular Wires as Chemical Sensors
Jing KongDepartment of Chemistry,Nathan R. FranklinDepartment of Chemistry,Chongwu ZhouDepartment of Chemistry,Michael G. ChaplineDepartment of Chemistry,Shu PengDepartment of Mechanical Engineering, Stanford University, Stanford, CA 94305, USAKyeongjae ChoDepartment of Mechanical Engineering, Stanford University, Stanford, CA 94305, USAHongjie DaiDepartment of Chemistry,
2000en
ABI
Annotatsiya
Chemical sensors based on individual single-walled carbon nanotubes (SWNTs) are demonstrated. Upon exposure to gaseous molecules such as NO(2) or NH(3), the electrical resistance of a semiconducting SWNT is found to dramatically increase or decrease. This serves as the basis for nanotube molecular sensors. The nanotube sensors exhibit a fast response and a substantially higher sensitivity than that of existing solid-state sensors at room temperature. Sensor reversibility is achieved by slow recovery under ambient conditions or by heating to high temperatures. The interactions between molecular species and SWNTs and the mechanisms of molecular sensing with nanotube molecular wires are investigated.
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