KLI

금 나노 입자를 활용한 표면증강라만산란 : 기초와 응용

Metadata Downloads
Abstract
Discovered from pyridine adsorbed on the roughened silver, surface-enhanced Raman scattering (SERS) has been a useful technique to overcome the main disadvantage of Raman spectroscopy that the signals are weak. SERS has little limitations in sample and enable to analyze very small amounts with high sensitivity or solution sample. Also, this technique is a non-destructive method and advantageous for biological sample analysis. Numerous studies have studied widely to understand this phenomenon, extending Raman spectroscopy and applying for various fields such as plasmonic and chemical sensing in nanoscale.

Herein, basic, mechanism and application research on SERS with gold nanoparticles were conducted. On basic study, we optimized the SERS effect and figured out several factors with gold nanourchins (AuNUs) that had sharp tips and the rhodamine 6G (R6G) as the probe molecules, controlling the parameters individually that were binding time, metal-to-molecule ratio, centrifugation, and stirring that decided the SERS enhancement. Second, the mechanism of SERS, especially chemical enhancement, has been studied with the assumption that electron withdrawing group (EWG) promoted a charge-transfer. Gold nanorods (AuNRs) and thiophenol derivatives substituted with electrophilicity on para-position were used, proving the assumption on EWG but more complicated approaches such as intermolecular interaction and solvent effect were needed on electron donating group (EDG) study. Finally, cucurbit[n]urils (CB[n]), one of useful supramolecular materials, were used to overcome the limitation of SERS that the adsorbed molecules had to interact with metal surface. By encapsulation of the probe molecules in cucurbit[7]urils (CB[7]) with host-guest interaction and adsorbing CB[7] on surface of AuNRs, the enhanced signal showed a long-term stability for 20 days. These results are helpful to understand deeply SERS, providing information about its principle, mechanism, the factors affecting its enhancement and suggest the potential to utilize SERS on various fields by introducing supramolecular CB[n].
Author(s)
서민정
Issued Date
2018
Awarded Date
2019-02
Type
Dissertation
Keyword
SERSRamanGold nanoparticlesChemical enhancementRhodamine 6GCucurbit[7]urils
URI
https://oak.ulsan.ac.kr/handle/2021.oak/6563
http://ulsan.dcollection.net/common/orgView/200000171593
Alternative Author(s)
Min Jung Seo
Affiliation
울산대학교
Department
일반대학원 화학과
Advisor
하지원
Degree
Master
Publisher
울산대학교 일반대학원 화학과
Language
eng
Rights
울산대학교 논문은 저작권에 의해 보호받습니다.
Appears in Collections:
Chemistry > 1. Theses (Master)
Authorize & License
  • Authorize공개
Files in This Item:

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.