Structure, Stability, and Electronic Interactions of Polyoxometalates on Functionalized Graphene Sheets

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• 作者：Jean-Philippe Tessonnier ; Stephanie Goubert-Renaudin ; Shaun Alia ; Yushan Yan ; Mark A. Barteau
• 刊名：Langmuir
• 出版年：2013
• 出版时间：January 8, 2013
• 年：2013
• 卷：29
• 期：1
• 页码：393-402
• 全文大小：551K
• 年卷期：v.29,no.1(January 8, 2013)
• ISSN：1520-5827

文摘

Polyoxometalates (H₃PMo₁₂O₄₀, H₃PW₁₂O₄₀, H₄PMo₁₁VO₄₀) supported on oxygen- and alkyl-functionalized graphene sheets were investigated. Discrete molecular species were directly observed by electron microscopy at loadings below 20 wt.%. The interaction between the polyoxometalates and the graphene surface was found to significantly impact their vibrational spectra and a linear correlation between the frequency of the M-O_c-M vibration and the dispersion was evidenced by FTIR. While bulk-like electronic properties were observed for small aggregates (2鈥? nm), UV鈥搗is spectroscopy and cyclic voltammetry revealed changes in the electronic structure of isolated molecular species as a result of their interaction with graphene. Because of the ability to disperse alkyl-functionalized graphene in a variety of polar and nonpolar solvents, the materials synthesized in this work provide an opportunity to disperse polyoxometalates in media in which they would not dissolve if unsupported.