A carbon nanotube gas sensor fabricated by dielectrophoresis and its application for NH3 detection

Author

Wang, Renhui ; Li, Hongtao ; Pan, Min ; Chen, Dajing

Author_Institution

Dept. of Biomed. Eng., Zhejiang Univ., Hangzhou, China

fYear

2009

fDate

3-6 Sept. 2009

Firstpage

6046

Lastpage

6049

Abstract

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 NH₃ 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 NH₃ at room temperature. There is a good linear correlation between the decreasing amplitude of conductance and the NH₃ concentration, and the detection limit of 10 ppm NH₃ could be achieved.

Keywords

ammonia; electrical conductivity; electrochemical electrodes; electrochemical sensors; electrophoresis; gas sensors; nanofabrication; nanosensors; nanotube devices; Au; C; MWNT sensor; NH₃; ammonia detection; carbon nanotube gas sensor fabrication; dielectrophoresis; electrical conductivity; ethanol evaporation; interdigitated gold electrodes; linear correlation; multiwalled carbon nanotubes; temperature 293 K to 298 K; Ammonia; Electrodes; Electrophoresis; Equipment Design; Equipment Failure Analysis; Gases; Microfluidics; Nanotechnology; Nanotubes, Carbon; Sensitivity and Specificity; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2009. EMBC 2009. Annual International Conference of the IEEE

Conference_Location

Minneapolis, MN

ISSN

1557-170X

Print_ISBN

978-1-4244-3296-7

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2009.5334531

Filename

5334531