Electronic Structure of Diamond Surfaces Functionalized by Ru(tpy)2
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- 作者：Ioannis Zegkinoglou ; Peter L. Cook ; Phillip S. Johnson ; Wanli Yang ; Jinghua Guo ; David Pickup ; Rub茅n Gonz谩lez-Moreno ; Celia Rogero ; Rose E. Ruther ; Matthew L. Rigsby ; J. Enrique Ortega ; Robert J. Hamers ; F. J. Himpsel
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：July 5, 2012
- 年：2012
- 卷：116
- 期：26
- 页码：13877-13883
- 全文大小：381K
- 年卷期：v.116,no.26(July 5, 2012)
- ISSN：1932-7455
文摘
Highly doped diamond films are new candidates for electrodes in reactive environments, such as electrocatalytic interfaces. Here the electronic structure of such films is investigated by X-ray absorption spectroscopy at the C 1s and B 1s edges, combined with X-ray and ultraviolet photoelectron spectroscopy, as well as optical measurements. A diamond surface functionalized covalently with Ru(tpy)2, a model complex similar to ruthenium-based molecules used in photocatalysis and photovoltaics, is compared to a hydrogen-terminated diamond surface as a reference. Bulk-sensitive absorption spectra with photon detection reveal diamond gap states, while surface-sensitive spectra with electron detection reveal the adsorbate states and 蟺-bonding at the diamond surface. The positions of the frontier orbitals of the dye relative to the band edges of diamond are inferred from the spectroscopic data. The implications of using diamond films as inert electron donors in photocatalysis and dye-sensitized solar cells are discussed.