title: A carbon monoxide gas sensor using oxygen plasma modified carbon nanotubes.
abstract: Carbon monoxide (CO) is a highly toxic gas that can be commonly found in many places. However, it is not easily detected by human olfaction due to its colorless and odorless nature. Therefore, highly sensitive sensors need to be developed for this purpose. Carbon nanotubes (CNTs) have an immense potential in gas sensing. However, CNT-based gas sensors for sensing CO are seldom reported due to the lack of reactivity between CO and CNTs. In this work, O(2) plasma modified CNT was used to fabricate a CNT gas sensor. The plasma treated CNTs showed selectively towards CO, with the capability of sensing low concentrations of CO (5 ppm) at room temperature, while the pristine CNTs showed no response. UV spectra and oxygen reduction reaction provided evidence that the difference in sensing property was due to the elimination of metallic CNTs and enhancement of the oxygen reduction property.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore.
authors.forename: Weiyun
authors.initials: W
authors.lastname: Zhao
authors.forename: Derrick Wen Hui
authors.initials: DW
authors.lastname: Fam
authors.forename: Zongyou
authors.initials: Z
authors.lastname: Yin
authors.forename: Ting
authors.initials: T
authors.lastname: Sun
authors.forename: Hui Teng
authors.initials: HT
authors.lastname: Tan
authors.forename: Weiling
authors.initials: W
authors.lastname: Liu
authors.forename: Alfred Iing Yoong
authors.initials: AI
authors.lastname: Tok
authors.forename: Yin Chiang Freddy
authors.initials: YC
authors.lastname: Boey
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Huey Hoon
authors.initials: HH
authors.lastname: Hng
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Yan
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods*; D002248:Carbon Monoxide / Q000032:analysis*; D006801:Humans; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010100:Oxygen / Q000737:chemistry*; D058626:Plasma Gases / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
chemical_list: D037742:Nanotubes, Carbon; D058626:Plasma Gases; D002248:Carbon Monoxide; D010100:Oxygen