期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 143, 期 1, 页码 333-340出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.09.029
关键词
Ammonia gas sensor; Plasma funtionalization; MWCNT; Polyaniline; MWCNT/polymer composite
资金
- Korea Research Foundation
- Korean government, Ministry of Education, Science and Technology (MEST) [2009-0085863]
- National Research Foundation of Korea [2009-0085863] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The effects of radio frequency oxygen plasma treatment on the NH3 gas sensing characteristics of multiwall carbon nanotube (MWCNT)/polyaniline (PANI) composite films are investigated using sensor devices fabricated onto a MEMS micro-hotplate. The Raman and XPS spectra of O-2 plasma-treated MWCNTs indicate that oxygenated groups are created on the surface of CNTs after the plasma treatment. These oxygen-containing defects at the Surface of plasma-functionalized multiwall carbon nanotubes (pf-MWCNTs) provide a binding site for the PANI. facilitate the CNT-PANI bond. and promote conduction between the MWCNTs and the PAN]. The pf-MWCNT/PANI films are found to have a much better linear response and a sensitivity about three times higher than that of a corresponding pristine MWCNT for ammonia concentrations ranging from 0 to 100ppm. This dramatic improvement in sensing performance may be attributed to the resistance change of the PANI due to deprotonation and the resistance increase of the MWCNTs due to electron transfer from the PANI to the MWCNTs. The pf-MWCNT/PANI films also exhibit a much lower sensitivity to humidity compared with MWCNTs alone. This may be partially due to the reduction of defects on the pf-MWCNT surface available for binding with water molecules. and partially due to opposite sign slope cancellation. (C) 2009 Elsevier B.V. All rights reserved.
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