Effect of chemical oxidation on the gas sensing properties of multi-walled carbon nanotubes

Author

Xu, M. ; Sun, Z. ; Chen, Q. ; Tay, B.K.

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore

fYear

2008

fDate

24-27 March 2008

Firstpage

130

Lastpage

133

Abstract

The effect of chemical oxidation on the gas sensing properties of multi-walled carbon nanotubes (MWNT) is presented in this paper. The MWNT was chemically oxidized in a mixture of concentrated sulfuric and nitric acids. The oxidation time was varied from 4 to 12 hours. X-ray photoelectron spectroscopy (XPS) was used to study effect on the chemical composition of the nanotube surface. The MWNT was deposited onto gas sensor substrate by drop coating method. The gas sensing properties of samples with different oxidation time for NO₂ and NH₃ were investigated at room temperature. Comparing with the as-obtained MWNT, the gas sensitivity of functionalized MWNT was greatly increased for both NO₂ and NH₃.

Keywords

X-ray photoelectron spectra; X-ray spectroscopy; carbon nanotubes; gas sensors; C; X-ray photoelectron spectroscopy; chemical composition; chemical oxidation time; drop coating; gas sensing property; gas sensitivity; gas sensor substrate; multiwalled carbon nanotubes; nanotube surface; Carbon nanotubes; Chemicals; Nanoelectronics; Oxidation;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanoelectronics Conference, 2008. INEC 2008. 2nd IEEE International

Conference_Location

Shanghai

Print_ISBN

978-1-4244-1572-4

Electronic_ISBN

978-1-4244-1573-1

Type

conf

DOI

10.1109/INEC.2008.4585453

Filename

4585453