Low-Temperature Growth of C60 Monolayers on Au(111): Island Orientation Control with Site-Selective Nucleation
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- 作者：Xin Zhang ; Lin Tang ; Quanmin Guo
- 刊名：Journal of Physical Chemistry C
- 出版年：2010
- 出版时间：April 15, 2010
- 年：2010
- 卷：114
- 期：14
- 页码：6433-6439
- 全文大小：358K
- 年卷期：v.114,no.14(April 15, 2010)
- ISSN：1932-7455
文摘
We report a low-temperature scanning tunnelling microscopy (STM) study of the adsorption of C60 molecules on the (111) surface of gold. At 46 K, occupation of the elbow sites on Au(111) by individual C60 molecules as well as small molecular clusters is observed at a coverage of 0.01monolayer (ML). The molecular clusters are mostly found in the FCC regions adjacent to the bulged elbows while most of the pinched elbows remain decorated by single molecules. At a higher coverage of 0.05 ML, the islands nucleated at the bulged elbow sites increase in size, and at the same time, a delayed nucleation process starts around the pinched elbow sites. The C60 islands show different azimuthal orientations similar to that found for larger islands formed at room temperature. The islands in the FCC region near the bulged elbows grow with coverage, but are confined by the discommensuration lines. At 180−190 K, C60 molecules are found to preferentially attach to the bulged elbow site and island nucleation occurs exclusively on the bulged site. This single-site-nucleation phenomenon leads to the formation of C60 islands with a single orientation.