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Study of nanotribological properties of multilayer graphene by calibrated atomic force microscopy

机译:校准原子力显微镜研究多层石墨烯的纳米摩擦学性能

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摘要

The nanotribological properties of multilayer graphene oxide (MGO), multilayer reduced graphene oxide (MRGO), and mechanically exfoliated multilayer graphene (MEMG) deposited on SiO_2 substrate were comparatively investigated via calibrated atomic force microscopy in ambient conditions. Friction as a function of the applied normal load and sliding velocity was studied. Results show that all three types of multilayer graphene films exhibit good adhesion and friction reduction properties. MEMG exhibits the lowest friction and adhesive force because of its perfect planar lattice. A logarithmic increase in friction was observed at low sliding velocities for all measured graphene films. Friction decreases on MGO and bare SiO_2 substrate, whereas it remains approximately constant on MEMG and MRGO, when the sliding velocity exceeds their critical velocities. The possible mechanisms for the experimental results were discussed. Our studies provide a good opportunity to use different types of multilayer graphene films for promising lubricant applications in nanodevices.
机译:通过在环境条件下通过校准的原子力显微镜对沉积在SiO_2衬底上的多层氧化石墨烯(MGO),多层还原氧化石墨烯(MRGO)和机械剥离的多层石墨烯(MEMG)的纳米摩擦性能进行了比较研究。研究了摩擦力与所施加的法向载荷和滑动速度的关系。结果表明,所有三种类型的多层石墨烯薄膜均具有良好的附着力和降低摩擦的性能。 MEMG由于具有完美的平面晶格,因此具有最低的摩擦力和粘合力。对于所有测得的石墨烯薄膜,在低滑动速度下观察到摩擦的对数增加。当滑动速度超过其临界速度时,MGO和裸露的SiO_2基底上的摩擦减小,而MEMG和MRGO上的摩擦保持近似恒定。讨论了实验结果的可能机制。我们的研究提供了一个很好的机会,可以将不同类型的多层石墨烯薄膜用于纳米器件中有希望的润滑剂应用。

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