Lodge M S, Tang C, Blue B T, Hubbard W A, Martini A, Dawson B D, Ishigami M
Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA.
School of Engineering, University of California Merced, Merced, CA 95343, USA.
Sci Rep. 2016 Aug 24;6:31837. doi: 10.1038/srep31837.
In order to test recently predicted ballistic nanofriction (ultra-low drag and enhanced lubricity) of gold nanocrystals on graphite at high surface speeds, we use the quartz microbalance technique to measure the impact of deposition of gold nanocrystals on graphene. We analyze our measurements of changes in frequency and dissipation induced by nanocrystals using a framework developed for friction of adatoms on various surfaces. We find the lubricity of gold nanocrystals on graphene to be even higher than that predicted for the ballistic nanofriction, confirming the enhanced lubricity predicted at high surface speeds. Our complementary molecular dynamics simulations indicate that such high lubricity is due to the interaction strength between gold nanocrystals and graphene being lower than previously assumed for gold nanocrystals and graphite.
为了测试最近预测的金纳米晶体在石墨上以高表面速度时的弹道式纳米摩擦（超低阻力和增强的润滑性），我们使用石英微量天平技术来测量金纳米晶体沉积在石墨烯上的影响。我们使用为吸附原子在各种表面上的摩擦而开发的框架，分析了由纳米晶体引起的频率和耗散变化的测量结果。我们发现金纳米晶体在石墨烯上的润滑性甚至高于弹道式纳米摩擦所预测的润滑性，证实了在高表面速度下预测的增强润滑性。我们互补的分子动力学模拟表明，这种高润滑性是由于金纳米晶体与石墨烯之间的相互作用强度低于先前对金纳米晶体与石墨所假设的强度。
