Synthesis of perovskite nanotubes via galvanic replacement reaction for gas sensing갈바닉 치환 반응을 적용한 페로브스카이트 나노튜브 기반 가스센서에 관한 연구

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Designing gas sensors with a lower detection limit is necessary to exhaled breath analysis for early diagnosis, which is a critical issue in health status. In addition, acetylene gas can be used as a specific marker for smoking status and air pollution. Here, a synthesis of SnO$_2$/LaFeO$_3$ nanotubes (NTs) is suggested through an electrospinning technique with galvanic replacement reaction (GRR), which dramatically improves acetylene sensing behavior. The controlled GRR process provides SnO$_2$/LaFeO$_3$ NTs with a high surface area (146.6 m$^2$g$^{-1}$) by generation of SnO$_2$ nanograins (< 10 nm) and catalytic p-n heterojunctions by controlled reaction time with Sn precursor solution. Owing to the advantage of these features, the GRR treated SnO$_2$/LaFeO$_3$ NTs exhibited 31.2-fold higher acetylene response with fast response speed (16 s) compared to pristine LaFeO$_3$ NTs (64 s). These results demonstrate that GRR can be used to enhance the gas sensing performance with controllable morphology and compositions of 1D metal oxides.
Advisors
Kim, Il-Dooresearcher김일두researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2022
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 신소재공학과, 2022.2,[iii, 23 p. :]

URI
http://hdl.handle.net/10203/308949
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=997701&flag=dissertation
Appears in Collection
MS-Theses_Master(석사논문)
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