Probing the Effect of Molecular Orientation on the Intensity of Chemical   Enhancement Using Graphene-Enhanced Raman Spectroscopy

doi:10.1002/smll.201102223

CORC > 北京大学 > 信息科学技术学院

	Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene-Enhanced Raman Spectroscopy
	Ling, Xi ; Wu, Juanxia ; Xu, Weigao ; Zhang, Jin
刊名	small
	2012
关键词	chemical enhancement graphene Langmuir-Blodgett films molecular orientation Raman spectroscopy LANGMUIR-BLODGETT-FILMS PHTHALOCYANINE THIN-FILMS COPPER PHTHALOCYANINE CHARGE-TRANSFER METAL-PHTHALOCYANINES VIBRATIONAL-SPECTRA OPTICAL-ABSORPTION SCATTERING SURFACE SERS
DOI	10.1002/smll.201102223
英文摘要	A rational approach to investigate the effect of molecular orientation on the intensity of chemical enhancement using graphene-enhanced Raman spectroscopy (GERS) is developed. A planar molecule, copper phthalocyanine (CuPc), is used as probe molecule. Annealing allows the CuPc molecule in a LangmuirBlodgett film to change orientation from upstanding to lying down. The UVvisible absorption spectra prove the change of the molecular orientation, as well as the variation of the interaction between the CuPc molecule and graphene. The Raman spectra of the molecule in the two different orientations are compared and analyzed. The results show that chemical enhancement is highly sensitive to the molecular orientation. The different molecular orientations induce different magnitudes of the interaction between the molecule and graphene. The stronger the interaction, the more the Raman signal is enhanced. Furthermore, the sensitivity of GERS to molecular orientation is promising to determine the orientation of the molecule on graphene. Based on this molecular orientation sensitive Raman enhancement, quantitative calculation of the magnitude of the chemical enhancement is implemented for a series of Pc derivatives. It shows that the magnitude of the chemical enhancement can be used to evaluate the degree of interaction between the molecules and graphene. Moreover, an understanding of the chemical enhancement in GERS is promoted and the effect of molecular orientation on the intensity of chemical enhancement is explained.; Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter; SCI(E); EI; PubMed; 24; ARTICLE; 9; 1365-1372; 8
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/149918]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Ling, Xi,Wu, Juanxia,Xu, Weigao,et al. Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene-Enhanced Raman Spectroscopy[J]. small,2012.
APA	Ling, Xi,Wu, Juanxia,Xu, Weigao,&Zhang, Jin.(2012).Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene-Enhanced Raman Spectroscopy.small.
MLA	Ling, Xi,et al."Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene-Enhanced Raman Spectroscopy".small (2012).