(A) study on electrospinning nanofibers functionalized by nanoparticles loaded by apoferritin for the application of exhaled gas sensors날숨센서 응용을 위한 아포페리틴안의 나노입자에 의해 기능화된 전기방사 나노섬유에 대한 연구

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Exhaled breath includes many volatile organic compounds (VOCs) which is a kind of a biomarker of certain diseases. A chemo-resistive sensor using a semiconductor metal oxide (SMO) allows us to measure analyte gases concentrations which change a resistance of the sensor. SMO gas sensors have a merit such as portability and low price, and have a limitation such as sensitivity and selectivity. In order to improve the sensitivity and selectivity of SMO gas sensors, nanosize sensing materials which have a great deal of surface areas are used to form gas sensors. In this study, electrospinning method was used to fabricate one dimensional (1D) nanofibers (NFs) of SMOs easily. $SnO_2$ and $WO_3$ as N-type SMOs were used to form gas sensing materials. In order to enhance both sensitivity and selectivity, catalysts such as both Ru and Ag which were loaded by apoferritin cages, were used. Also, P-type SMOs such as both NiO and $MoO_3$ were formed in both N-type $SnO_2$ and $WO_3$ as N-type SMOs for improving both sensitivity and selectivity by generating electron depletion layers at the boundary between P-type and N-type SMOs. For the evaluation of material properties, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were used. Gas sensor analysis was carried out to various analyte gases such as acetone, hydrogen sulfide and toluene as biomarkers of diabetes, halitosis and lung cancer, respectively. Electrospun $WO_3$ NFs with Ru nanoparticles (NPs) loaded by apoferritin shows better sensitivity to acetone gas than pristine $WO_3 NFs$ . $WO_3$ with Mo NPs loaded by apoferritin represents better sensitivity to hydrogen sulfide gas than pristine WO3 NFs. Those sensing materials could be utilized to daily monitoring sensors for various diseases diagnosis.
Advisors
Kim, Il-Dooresearcher김일두researcher
Description
한국과학기술원 :신소재공학과,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2016.8 ,[xiii, 102 p. :]

Keywords

semiconductor metal oxides; electrospinning; apoferritin; nanofibers; gas sensors; 금속산화물 반도체; 전기방사; 아포페리틴; 나노섬유; 개스 센서

URI
http://hdl.handle.net/10203/222209
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=663143&flag=dissertation
Appears in Collection
MS-Theses_Ph.D.(박사논문)
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