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표면증강 라만 분광 기반 고감도 가스분석 연구 동향 및 전망

Review of Gas Detection by Surface-enhanced Raman Spectroscopy and the Prospect

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키워드

주제분류물리학

초록

금속 나노구조체에서 표면 플라즈몬(surface plasmon) 효과에 의한 라만 신호의 거대한 증강 현상은 간편한 분광 장치만으로도 나노구조 표면에 흡착된 여러 종류의 분자들을 고감도로 일시 식별할 수 있는 기회를 제공한다. 표면증강 라만 분광 기술(surface-enhanced Raman spectroscopy, SERS)은 바이오 및 화학물질 등을 고감도로 정량분석하는 데에 광범위하게 사용할 수 있으며, 가스 분자 분석에도 매우 유용 함이 선행 연구를 통해 입증되었다. 본 논문에서는 표면증강 효율(enhancement factor)이 우수한 나노물질 개발, 금속 표면 기능성 코팅, 소형 SERS 센서 시스템 개발의 세 가지 주제로 나누어 주요 기술적 과제와 선행 연구 성과들을 소개하고, 현 시장에서 요구하는 다양한 분야의 가스 분석 기술과 비교하여 현 시점의 SERS 가스 센서 기술 한계와 향후 전망 및 과제를 제시하였다.

Abstract

The huge enhancement of the Raman signal on the surface of metal nanostructures by surface plasmon effect provides great opportunities to detectvarious molecules absorbed on the surfaces simultaneously with high sensitivity. Surface-enhanced Raman spectroscopy (SERS) proved to be very promising for the highly sensitive detection of gases as well as biomaterials and chemicals in a large number of previous studies. In this paper, the main technical issues and their related achievements are introduced in view of three categories: fabrication of novel nanostructures with high enhancement factors, functionalization of metal surfaces, and development of compact SERS spectrometers. The limits of current SERS gas sensortechnology and the prospects are also discussed, compared with practical technical needs in various application fields.

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