کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5369882 | 1388460 | 2007 | 5 صفحه PDF | دانلود رایگان |
Scanning tunneling microscopy (STM) and spectroscopy (STS) were used to study the electronic structure of Au(1Â 1Â 1) surface in the range of 2-5.5Â eV above the Fermi level. In this paper, we concentrate firstly on the position of the upper band gap edge (BE) existing in [1Â 1Â 1] direction in Au(1Â 1Â 1) and secondly on the position of the resonant image potential surface state (RIS) located in the bulk states approximately 1.1Â eV above BE. The experiment was carried out in UHV at two temperatures 294Â K and 580Â K. Our high temperature STS (HT-STS) results clearly show the presence of RIS and BE local maxima at both temperatures. What is more, a slight shift towards the Fermi level of BE and RIS was observed. Those shifts were the consequence of the change of [1Â 1Â 1] band gap and lowering gold work function due to the thermal extension of interatomic distances. Finally, estimation of the work function was given at 294Â K and 580Â K.
Journal: Applied Surface Science - Volume 253, Issue 8, 15 February 2007, Pages 4036-4040