Periodically Modulated Electronic Properties of the Epitaxial Monolayer Graphene on Ru(0001)

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• 作者：Wei Feng ; Shulai Lei ; Qunxiang Li ; Aidi Zhao
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：December 22, 2011
• 年：2011
• 卷：115
• 期：50
• 页码：24858-24864
• 全文大小：917K
• 年卷期：v.115,no.50(December 22, 2011)
• ISSN：1932-7455

文摘

The local structural and electronic properties of the epitaxial monolayer graphene (MG) on Ru(0001) surface were investigated by using scanning tunneling microscopy/spectroscopy (STM/STS) and first-principles calculations. High resolution STM images and STS spectra measured in a large bias voltage range indicated both geometric and electronic corrugation of the MG. The local work function (LWF) of the MG/Ru(0001) surface was obtained to be around 3.5 eV by two separate methods based on the experimental dz/dV and I鈥?i>z curves respectively. We also found a considerable LWF difference (about 100 to 200 meV) between different sites within a unit cell of the moir茅 pattern of MG/Ru(0001). Furthermore, noticeable bias-polarity-dependence of the local barrier height (LBH) of MG on Ru(0001) surface was observed, supporting the existence of the Smoluchowski smoothing effect due to the presence of surface dipole moment in consequence of strong MG鈥揜u interactions. These findings indicate that MG/Ru(0001) can be used as an ideal template for periodic nanostructures with various applications.