Si(111)-7×7表面上C<sub>60</sub>多层膜的生长及其纳米摩擦学性质

引用本文: 杜晓清, 李慧琴, 朱齐荣, 邹志强, 梁齐. Si(111)-7×7表面上C₆₀多层膜的生长及其纳米摩擦学性质[J]. 物理化学学报, 2011, 27(10): 2457-2461. doi: 10.3866/PKU.WHXB20111010 shu

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

Si(111)-7×7表面上C₆₀多层膜的生长及其纳米摩擦学性质

基金项目:
国家自然科学基金(10974134)资助项目 (10974134)

摘要: 在超高真空(UHV)条件下, 用分子束外延(MBE)方法, 通过对生长过程中蒸发速率和衬底温度等参数的控制, 可以避免C₆₀分子在Si(111)-7×7重构表面多层生长时团聚岛的形成, 得到了逐层生长的C₆₀多层膜. 同时利用超高真空扫描隧道显微镜(UHV-STM)对这种多层膜结构进行了观察并对这种现象产生的机理做了分析.测定了不同层数C₆₀薄膜的黏附力和摩擦力曲线, 发现分子层数对薄膜的摩擦性质有显著影响, 随着沉积层数的增加, 样品的摩擦力明显降低, 摩擦系数也有降低的趋势. 由于分子层数的增加导致C₆₀分子转动程度增强,本文得出结论, 摩擦力的降低是由C₆₀分子的转动引起的, C₆₀分子在这里充当了"纳米滚动轴承", 即C₆₀分子的转动为微观结构提供了能量耗散通道.

关键词:

English

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

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: 27 September 2011
Fund Project:
国家自然科学基金(10974134)资助项目

Abstract: 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.

Key words:

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Si(111)-7×7表面上C₆₀多层膜的生长及其纳米摩擦学性质

English

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

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Si(111)-7×7表面上C60多层膜的生长及其纳米摩擦学性质

English

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CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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