Nanotribological Properties of Composite Molecular Films: C60 Anchored to a Self-Assembled Monolayer
Nanotribological Properties of Composite Molecular Films: C60 Anchored to a Self-Assembled Monolayer
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DOI：
10.1021/la960160h
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发表时间：
1996-08
期刊：
影响因子：
3.9
通讯作者：
V. Tsukruk;M. Everson;L. M. Lander;W. Brittain
中科院分区：
文献类型：
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作者：
V. Tsukruk;M. Everson;L. M. Lander;W. Brittain
用摩擦力显微镜研究了富勒烯单分子层与自组装单分子层（C60−SAM）功能表面化学连接形成的分子膜的摩擦学性能。我们观察到非常高的复合富勒烯薄膜的磨损稳定性。这些薄膜的摩擦系数（μ）在很宽的范围内变化，从高载荷下的0.04 ± 0.02和最高测试速度（<1000 μm/s）下的0.06 ± 0.02到中等速度和低载荷下的0.15 ± 0.03。与烷基硅烷单层（CH 3 −SAM）的摩擦力稳定上升相比，这种非单调的速度行为是富勒烯薄膜的一个显著特征，可能与富勒烯分子结构重排过程中的能量耗散有关。C60−SAM薄膜在各种速度和载荷下的摩擦系数为0.04−0.15，远低于硅表面的μ（0.1−0.6），与CH 3 −SAM（0.02−0.05）和叠氮化物终止的单层N3−SAM（0.04− 0.05）的摩擦系数相当。
Tribological properties of molecular films composed of a fullerene monolayer chemically attached to the functional surface of self-assembled monolayers (C60−SAM) were studied by friction force microscopy. We observed very high wear stability of composite fullerene films. The friction coefficient (μ) for these films varies in a wide range from 0.04 ± 0.02 at high loads and 0.06 ± 0.02 at the highest velocities tested (<1000 μm/s) to 0.15 ± 0.03 at intermediate velocities and low loads. This non-monotonic velocity behavior is a striking feature of fullerene films as compared to steadily rising friction forces for alkylsilane monolayers (CH3−SAM) and may be related to exceeding dissipation of energy during structural rearrangement of fullerene molecules. The friction coefficient of C60−SAM films of 0.04−0.15 at various velocities and loads is much lower than μ for silicon surfaces (0.1−0.6) and is comparable to the friction coefficient of CH3−SAM (0.02−0.05) and an azide-terminated monolayer, N3−SAM (0.04−0....