Investigation of n-Layer Graphenes as Substrates for Raman Enhancement of Crystal Violet

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• 作者：Caiyu Qiu ; Haiqing Zhou ; Huaichao Yang ; Minjiang Chen ; Yanjun Guo ; Lianfeng Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 26, 2011
• 年：2011
• 卷：115
• 期：20
• 页码：10019-10025
• 全文大小：927K
• 年卷期：v.115,no.20(May 26, 2011)
• ISSN：1932-7455

文摘

In this work, Raman signals from crystal violet (CV) molecules on n-layer graphenes are clearly observed while these signals are invisible on SiO₂/Si substrate under the same deposition condition with the same concentration of CV solution. This indicates that n-layer graphenes can be used as substrates for enhancing Raman signals of adsorbed CV molecules. The enhanced efficiency is found to be closely related to the layer number n. These conclusions can be further confirmed by Raman spectra of CV molecules on gold-decorated n-layer graphenes. The Raman enhancement effect of n-layer graphenes is attributed to chemical mechanism (CM) while electromagnetic mechanism (EM) dominates the enhancement effect of gold. Thus, graphene provides a convenient way to study CM exclusively. The morphology and density of gold nanostructures on n-layer graphenes play a significant role in the EM related Raman enhancement effect.