N-Acetylalanine Monolayers at the Silver Surface Investigated by Surface Enhanced Raman Scattering Spectroscopy and X-ray Photoelectron Spectroscopy: Effect of Metallic Ions

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• 作者：Haifeng Yang ; Xuan Zhu ; Wei Song ; Yiping Sun ; Guoping Duan ; Xia Zhao ; Zongrang Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：September 25, 2008
• 年：2008
• 卷：112
• 期：38
• 页码：15022-15027
• 全文大小：163K
• 年卷期：v.112,no.38(September 25, 2008)
• ISSN：1932-7455

文摘

Surface-enhanced Raman scattering (SERS) spectroscopy was applied to observe the process and structure of N-acetylalanine molecules self-assembled at the silver surface. SERS data show that the N-acetylalanine molecules adsorb at the silver surface through the amino group and the entire carboxyl group in a perpendicular way after a self-reorganization. Results of SERS and X-ray photoelectron spectroscopic experiments indicate that the Ce³⁺ affects the structure of monolayers because of the binding reaction between the Ce³⁺ and the carbonyl along with the amino groups in N-acetylalanine. The Ce³⁺ capped by N-acetylalanine monolayers can be removed by adding EDTA solution and the original structure of monolayers is recovered. However, the impact of K⁺ on the structure of N-acetylalanine monolayers is slight and can be ignored.