DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Jung, Yeon Sik | - |
dc.contributor.advisor | 정연식 | - |
dc.contributor.author | Kim, Minjoon | - |
dc.date.accessioned | 2023-06-23T19:32:23Z | - |
dc.date.available | 2023-06-23T19:32:23Z | - |
dc.date.issued | 2021 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=1007042&flag=dissertation | en_US |
dc.identifier.uri | http://hdl.handle.net/10203/309001 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 신소재공학과, 2021.2,[iii, 41 p. :] | - |
dc.description.abstract | Detection of trace amount analytes is essential for the inspection of environmental contaminants in water systems. Various chromatographic and spectroscopic methods have been used for detecting pollutants, but surface-enhanced Raman spectroscopy (SERS) stands out for the obtainment of molecular-specific signals through rapid and non-destructive processes. Diverse nanostructures and fabrication methods have been reported for detection up to attomolar concentration. Yet, trace-amount detection remains problematic because the delivery of sufficient amounts of analytes to the proximity of “hot spots” is required for sufficient enhancement effects. That is, a lack of molecules near a given dense region of “hot spots” may hinder the identification of weak Raman signals within spectra of low signal-to-noise ratios. Therefore, a platform that gathers analytes dispersed over a large area to a specific target region is in need to obtain signals from a greater number of molecules near the same group of “hot spots.” Here, we introduce an area-selective hydrophobicity-modified SERS substrate for focusing analyte molecules towards a small-area hydrophilic pinning point during evaporation of water-based solvents. An Ag nanowire (AgNW) substrate of cross-stacked parallel arrays of sub-20 nm spaced nanowires is functionalized with 1H,1H,2H,2H-perfluorodecanethiol for increased hydrophobicity while the substrate center is coated with SiO$_2$ for hydrophilicity. Raman measurements at the hydrophilic center show peaks of molecules at extremely low concentrations that are difficult to detect on bare AgNW substrates with up to ten-fold increase in peak intensities. | - |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Surface-enhanced Raman spectroscopy▼aTrace-amount detection▼aHot spots▼aHydrophobicity▼a1H,1H,2H,2H-perfluorodecanethiol▼aArea-selective modification▼aNanowires | - |
dc.subject | 표면 증강 라만 산란▼a미량 검출▼a소수성▼a영역별 선택적 변화▼a나노선 | - |
dc.title | Area-selective hydrophobicity modification of plasmonic surfaces for enriched SERS analysis | - |
dc.title.alternative | 플라즈모닉 표면의 선택적 소수성 변화를 통한 미량 물질의 SERS 신호 증폭 극대화 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 325007 | - |
dc.description.department | 한국과학기술원 :신소재공학과, | - |
dc.contributor.alternativeauthor | 김민준 | - |
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