Comparison of Gas Sensors Based on Oxygen Plasma-Treated Carbon Nanotube Network Films with Different Semiconducting Contents
- Authors
- Ham, Seung Woo; Hong, Hyun Pyo; Kim, Jin Woong; Kim, Jong Hyun; Kim, Ki Bum; Park, Chan Won; Min, Nam Ki
- Issue Date
- 5월-2015
- Publisher
- SPRINGER
- Keywords
- Gas sensor; semiconductor SWCNT; oxygen plasma treatment; sensitivity
- Citation
- JOURNAL OF ELECTRONIC MATERIALS, v.44, no.5, pp.1344 - 1350
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF ELECTRONIC MATERIALS
- Volume
- 44
- Number
- 5
- Start Page
- 1344
- End Page
- 1350
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93734
- DOI
- 10.1007/s11664-014-3586-3
- ISSN
- 0361-5235
- Abstract
- We report on the effect of oxygen plasma treatment on the performance of single-wall carbon nanotube (SWCNT) NH3 gas sensors with different semiconducting contents (66% and 90% semiconducting SWCNTs). The performance of chemical sensors based on SWCNT networks depends on the concentration of semiconducting SWCNTs (s-SWCNTs), whose conductance can be significantly modulated by the absorbed molecules and the surface functionalization. After oxygen plasma treatment, the 66% s-SWCNT sample showed an increase in sensitivity from 0.0275%/ppm to 0.1525%/ppm (5.5 times), while the 90% s-SWCNT device demonstrated an increase in sensitivity from 0.1184%/ppm to 1.5707%/ppm (13 times). These results correspond to improvements in sensitivity of 57 times and 10 times compared with pristine and plasma-treated 66% s-SWCNT samples, respectively. In addition, the plasma-treated sensors exhibited much faster response and recovery times than the pristine one. The large improvement in performance was explained by the presence of oxygen-containing functional groups and the sp(2)-sp(3) structure change of SWCNTs, which changes the binding energy while increasing the uptake of polar molecules such as NH3.
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Collections - College of Science and Technology > Department of Electro-Mechanical Systems Engineering > 1. Journal Articles
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