Development of catalyst functionalized metal oxides and their application for exhaled breath chemical sensor = 촉매가 결착된 금속산화물 나노구조체의 형상제어 및 날숨 화학 센서 개발에 관한 연구

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Breath analysis is getting intensive attention as the importance of early diagnosis of diseases increases. A number of diseases such as halitosis, and diabetes can be diagnosed by detection of low concentration of biomarkers such as hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and acetone in exhaled breath. As an attractive type of breath analyzing devices, a chemiresistive sensor which uses semiconductor metal oxide (SMOs) have been intensively studied. The SMOs-based sensing layers can provide tremendous advantages in terms of easy miniaturization, flexibility in production, simplicity of their use, and high connectivity with mobile devices. However, the SMOs have relatively low sensitivity and selectivity, which are challenge issues in practical use in application for exhaled sensors. The advances in nanostructures can address these issues, considering that the sensing reaction of analyte gases occur on the surface of the metal oxides. Tailoring of the SMOs nanostructures for large surface area and high porosity is a general approach for higher sensing performances. The catalytic functionalization is also inevitable process for high sensitivity and selectivity. In this thesis, to develop the diverse three-dimensional (3D) hierarchical SMO nanostructure having large surface area as well as high porosity, the electrostatic spraying approach, and spray pyrolysis approach, which are facile and versatile technique, were adopted. Their sensing performances were investigated according to their morphological change and porosity. In addition, noble metallic nanoparticles (NPs) were functionalized on the SMO sensing layers to further improve sensitive and selective properties. Therefore, a number of sensing composites were prepared to establish sensor libraries. These sensor libraries were investigated to understand the sensing performances for breath pattern recognition using principal component analysis. This thesis demonstrated high potential feasibility of SMO-based sensing layer functionalized with diverse catalysts for application in breath analysis.
Advisors
Kim, Il-Dooresearcher김일두researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2019
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2019.2,[99 p. :]

Keywords

3D hierarchical structure▼aelectrostatic spraying▼aspray pyrolysis▼aexhaled breath chemical sensor▼ametal oxide; 3차원 계층구조▼a정전분사▼a분무열분해▼a날숨화학센서▼a금속산화물

URI
http://hdl.handle.net/10203/264975
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=842483&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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