Atomic-scale control of friction by actuation of nanometer-sized contacts
Atomic-scale control of friction by actuation of nanometer-sized contacts
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DOI：
10.1126/science.1125874
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发表时间：
2006-07-14
期刊：
影响因子：
56.9
通讯作者：
Meyer, Ernst
中科院分区：
文献类型：
--
作者：
Socoliuc, Anisoara;Gnecco, Enrico;Meyer, Ernst
由于纳米机电器件具有较大的表面体积比和传统液体润滑剂的不适用性，因此粘滞和磨损是纳米机电器件中非常棘手的问题。通过激发垂直于接触平面的滑动系统的机械共振，实现了在原子尺度上开启和关闭摩擦的有效方法。在有限的激励和载荷范围内，由此产生的相互作用能的变化将摩擦降低到10皮牛顿以下，而没有任何明显的磨损。在没有驱动的情况下，在相同的范围内观察到原子粘滑运动导致耗散。即使正常的振荡需要能量来驱动，我们的技术也代表了一种有价值的方法来最小化纳米接触中的能量耗散。
Stiction and wear are demanding problems in nanoelectromechanical devices, because of their large surface-to-volume ratios and the inapplicability of traditional liquid lubricants. An efficient way to switch friction on and off at the atomic scale is achieved by exciting the mechanical resonances of the sliding system perpendicular to the contact plane. The resulting variations of the interaction energy reduce friction below 10 piconewtons in a finite range of excitation and load, without any noticeable wear. Without actuation, atomic stick-slip motion, which leads to dissipation, is observed in the same range. Even if the normal oscillations require energy to actuate, our technique represents a valuable way to minimize energy dissipation in nanocontacts.