DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Il-Doo | - |
dc.contributor.advisor | 김일두 | - |
dc.contributor.author | Shin, Euichul | - |
dc.date.accessioned | 2023-06-23T19:32:05Z | - |
dc.date.available | 2023-06-23T19:32:05Z | - |
dc.date.issued | 2022 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=997704&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/308950 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2022.2,[ii, 27 p. :] | - |
dc.description.abstract | restricting the choice of support materials and ex-solutes elements to feature high thermal stability to avoid thermal degradation. Here, we report intense pulsed light-derived high temperature transient photothermal effect on tungsten oxide nanofibers support materials to induce ex-solution of a series of noble metal catalysts (Pt, Rh, and Ir) in ambient air. Since the ex-solution process ends up within an extremely short time (20 ms), the thermal degradation of the support materials could be effectively avoided. At the same time, ex-solute metals are successfully ex-solved to form uniform size distributed sub-10 nm NPs. To prove the practical utility of ex-solved catalytic NPs functionalized on WO$_3$ NFs after IPL treatment, we demonstrated outstanding gas sensing performances, i.e., excellent selectivity, and remarkable durability toward H$_2$S. Altogether, we successfully demonstrated the new class of ambient air ex-solution phenomenon using the IPL-induced optical transient annealing process to overcome the challenges of conventional ex-solution methods and to contribute to expanding the ex-solution field for various applications. | - |
dc.description.abstract | Ex-solution phenomenon has been proposed as a promising strategy for designing high performance catalysts with remarkable high durability since ex-solved metal nanoparticles (NPs) are strongly anchored on host oxide lattices. However, recent ex-solution studies suffer from critical limitations such as the synthesis process of harsh reduction conditions at high temperature to ex-solve metallic NPs | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.title | Phase transition and catalyst functionalization in metal oxide using ultra-fast photothermal treatment for superior chemiresistive sensors | - |
dc.title.alternative | 급속광열처리를 이용한 금속산화물 상변화 및 촉매 기능화를 통한 저항변화식 가스센서 개발에 관한 연구 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 신의철 | - |
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