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The Surface Enhancement Effects of Substituent Groups on Aniline Derivatives in Raman Spectroscopy
Poster Title: The Surface Enhancement Effects of Substituent Groups on Aniline Derivatives in Raman Spectroscopy
Submitted on 13 Mar 2015
Author(s): Maryam Aldoghaim, Ngee-Sing Chong and Beng Guat Ooi
Affiliations: Graduate Student
This poster was presented at Pittcon 2015
Poster Views: 1,018
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Poster Information
Abstract: Surface enhanced Raman spectroscopy (SERS) can greatly enhance the signal from the Raman-active molecules that have been adsorbed onto specially prepared metal surfaces. The selectivity and the high sensitivity of SERS make it a superior method to Raman spectroscopy. The advantage of SERS technique is that it greatly enhances the signal from the Raman-active molecules, which have been adsorbed onto specially prepared metal surfaces. Normally the factor by which the signal is enhanced is 104-106. In certain cases, it may be as high as 1014. Nanostructures based on gold and silver are widely used for analyte adsorption in SERS method. In this study, the SERS analysis of ortho-anilines and para-anilines using silver colloids are compared. The dependence of SERS signal intensity on aniline substituents including halogens, nitro, methoxy, methyl, isopropyl, and tert-butyl groups are elucidated by SERS analysis of these compounds in silver colloid with a Raman spectrometer having an excitation wavelength of 785 nm. Both the steric requirements of chemisorption and the inductive effects of electron-withdrawal due to the substituent groups affect the signal intensities. The colloidal nanoparticles were also deposited onto copper surface for surface-enhanced analysis of the aniline derivatives. The characteristics of their adsorption onto metal surfaces and enhancement factors of SERS are discussed in terms of the computational modeling of the aniline structures. Summary: Studying the Surface Enhancement effects of substituent groups on aniline derivatives in Raman Spectroscopy
References: N. Leopold and B. Lendl, “A New Method for fast Preparation of Highly Surface-Enhanced Raman Scattering (SERS) Active Silver Colloids at Room Temperature by Reduction of Silver Nitrate with Hydroxylamine Hydrochloride,” Journal of Physical Chemistry B, Vol. 107, No. 24, 2003, pp. 5723-5727.
R. A. Davies, N. S. Chong, B. G. Ooi, “Chemical Enhancement of the Surface Enhanced Raman Scattering Signals of Anilines via Their Ortho-Substituents,” Optics and Photonics Journal 2013, Vol. 3, pp.13-23..
T. Tanaka, A. Nakajim, A. Watanabe, T. Ohno and Y. Ozaki, “Surface-Enhanced Raman Scattering Spectros- copy and Density Functional Theory Calculation Studies on Adsorption of o-, m-, and p-Nitroaniline on Silver Colloid,” Journal of Molecular Structure, 2003, Vol. 661- 662, pp. 437-449.
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