کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
701910 1460777 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanoscale friction properties of graphene and graphene oxide
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
پیش نمایش صفحه اول مقاله
Nanoscale friction properties of graphene and graphene oxide
چکیده انگلیسی


• AFM lateral force measurements of different graphene materials were performed
• The friction force for multi layer CVD graphene (7–9 layers) shows the values lowed than for HOPG.
• Oxidation results in dramatic increase of multilayer graphene friction.
• Strong adhesion to silicon dioxide substrate results in ultra low friction of single layer graphene.

Achieving superlow friction and wear at the micro/nano-scales through the uses of solid and liquid lubricants may allow superior performance and long-lasting operations in a range of micromechanical system including micro-electro mechanical systems (MEMS). Previous studies have indicated that conventional solid lubricants such as highly ordered pyrolitic graphite (HOPG) can only afford low friction in humid environments at micro/macro scales; however, HOPG is not suitable for practical micro-scale applications. In this study, we explored the nano-scale frictional properties of multi-layered graphene films as a potential solid lubricant for such applications. Atomic force microscopy (AFM) measurements have revealed that for high-purity multilayered graphene (7–9 layers), the friction force is significantly lower than what can be achieved by the use of HOPG, regardless of the counterpart AFM tip material. We have demonstrated that the quality and purity of multilayered graphene plays an important role in reducing lateral forces, while oxidation of graphene results in dramatically increased friction values. Also, for the first time, we demonstrated the possibility of achieving ultralow friction for CVD grown single layer graphene on silicon dioxide. This confirms that the deposition process insures a stronger adhesion to substrate and hence enables superior tribological performance than the previously reported mechanical exfoliation processes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Diamond and Related Materials - Volume 54, April 2015, Pages 91–96
نویسندگان
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