Citation: DU Xiao-Qing, LI Hui-Qin, ZHU Qi-Rong, ZOU Zhi-Qiang, LIANG Qi. Growth and Nanotribological Properties of C₆₀ Multilayer Films on Si(111)-7×7 Surface[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2457-2461. doi: 10.3866/PKU.WHXB20111010 shu

Growth and Nanotribological Properties of C₆₀ Multilayer Films on Si(111)-7×7 Surface

DU Xiao-Qing ^1,2 ,
LI Hui-Qin ² ,
ZHU Qi-Rong ² ,
ZOU Zhi-Qiang ² ,
LIANG Qi ^1,2,

1.
1. Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, P. R. China;
2. Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Received Date: 27 June 2011
Available Online: 17 August 2011
Fund Project: 国家自然科学基金(10974134)资助项目 (10974134)

C₆₀ layer by layer films without clusters were obtained on Si(111)-7×7 reconstructed surface by controlling parameters such as the evaporation speed and the temperature of substrate during the growth process. The experiments were carried out under ultra-high vacuum (UHV) using molecular beam epitaxy (MBE). These films were observed by ultra-high vacuum scanning tunneling microscopy (UHV-STM) and the mechanism of this phenomenon was analyzed. The adhesion and frictional force curves of these C₆₀ films with different layers were measured. Their frictional properties were found to be affected by the number of layers. The frictional force decreased obviously with the increase in layers and the frictional coefficient also showed a downward tendency. Our simulation showed that adhesion was not the main effect that led to a decrease in the frictional force. Since the increase of layers leads to a higher level of rotation for C₆₀ molecules, we conclude that the decrease in the frictional force is caused by the rotation of the C₆₀ molecules. C₆₀ molecule acts as"nano rolling bearing"here. That is, the rotation of the C₆₀ molecules provides a channel for energy dissipation in the microstructure. These kinds of multilayer films make it possible for us to study the relationship between the rotation of C₆₀ molecule and its other properties.
- Fullerene,
- Molecular beam epitaxy,
- Film growth,
- Nanotribological property,
- Scanning tunneling microscopy
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Growth and Nanotribological Properties of C₆₀ Multilayer Films on Si(111)-7×7 Surface