Wang Renhui, Li Hongtao, Pan Min, Chen Dajing
Biosensor National Special Laboratory, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:6046-9. doi: 10.1109/IEMBS.2009.5334531.
Multi-walled carbon nanotubes (MWNTs) were successfully manipulated by dielectrophoresis (DEP) to form electrical connection between interdigitated gold electrodes (IDEs) and were demonstrated to serve as gas sensor for NH(3) detection. The MWNTs were suspended in ethanol and deposited on the IDEs under the effect of DEP. After the evaporation of ethanol, the MWNTs remained between the gaps of the IDEs. The electrical conductivity of the DEP-fabricated MWNTs sensor decreased when exposed to NH(3) at room temperature. There is a good linear correlation between the decreasing amplitude of conductance and the NH(3) concentration, and the detection limit of 10 ppm NH(3) could be achieved.
多壁碳纳米管（MWNTs）通过介电泳（DEP）成功地进行了操控，以在叉指式金电极（IDEs）之间形成电连接，并被证明可作为用于检测NH₃的气体传感器。多壁碳纳米管悬浮在乙醇中，并在介电泳的作用下沉积在叉指式金电极上。乙醇蒸发后，多壁碳纳米管保留在叉指式金电极的间隙之间。在室温下，经介电泳制备的多壁碳纳米管传感器暴露于NH₃时，其电导率会降低。电导降低幅度与NH₃浓度之间存在良好的线性相关性，并且可以实现10 ppm NH₃的检测限。
