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대한화학회 제105회 학술발표회 및 총회 Surface-Enhanced Raman Scattering of Graphene: Dependence on Excitation Wavelength and Comparison of Single-Layer and Few-Layer Graphene

2010년 2월 17일 09시 43분 26초
39P198포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 <발표Ⅳ>
저자 및
이지숙, 심상덕1, 김봉수2, 신현석
울산과학기술대학교 에너지공학부, Korea
1삼성전기(주) 중앙연구소 분석그룹, Korea
2KAIST 화학과, Korea
Surface-enhanced Raman scattering (SERS) of graphene has been studied by depositing Au nanoparticles on graphene using thermal evaporation. An optimum condition for SERS measurement of graphene was first investigated by changing density of evaporated Au nanoparticles and excitation wavelength. When aggregated Au nanoparticles were formed on single-layer graphene and 633 nm was used as an excitation wavelength, SERS enhancement factor was maximum 120. While no band was observed in normal Raman spectrum before evaporation of Au using 785 nm, unlike 532 and 633 nm, only G band was significantly enhanced in SERS spectrum after evaporation of Au. Thus, SERS enhancement factor has not been determined when 785 nm was used as an excitation wavelength. Also, differences between single-layer and few-layer graphene were investigated by comparing their SERS images and spectra. The SERS enhancement factor in single-layer graphene was much larger than that in few-layer graphene and in single-layer graphene the SERS enhancement factor for the G band was larger than that for the 2D band. Moreover, the D band was observed in the SERS spectrum which has not appeared in a normal Raman spectrum before evaporation of Au. Appearance of the D band is not due to Au-induced defect but due to large enhancement of the D band from very small amount of defects on graphene.