期刊
NANO LETTERS
卷 14, 期 9, 页码 5212-5217出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl502147t
关键词
Fluorinated graphene; functionalization; friction; atomic stick-slip friction; energy corrugation
类别
资金
- U.S. National Science Foundation [CMMI-1068741, CMMI-1401164]
- Nano/Bio Interface Center through National Science Foundation under NSEC [DMR08-32802]
- NSF Major Research Instrumentation Grant [DMR-0923245]
- Extreme Science and Engineering Discovery Environment (XSEDE) - National Science Foundation [DMR-090098, MSS-130003]
- Korea Institute of Machinery and Materials through KIMM-Brown International Cooperative Research Program
- NSF [CMMI1308396]
- Base Programs via Office of Naval Research
- Direct For Mathematical & Physical Scien
- Division Of Mathematical Sciences [1216801] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1308396, 1362565, 1401164] Funding Source: National Science Foundation
The addition of a single sheet of carbon atoms in the form of graphene can drastically alter friction between a nanoscale probe tip and a surface. Here, for the first time we show that friction can be altered over a wide range by fluorination. Specifically, the friction force between silicon atomic force microscopy tips and monolayer fluorinated graphene can range from 5-9 times higher than for graphene. While consistent with previous reports, the combined interpretation from our experiments and molecular dynamics simulations allows us to propose a novel mechanism: that the dramatic friction enhancement results from increased corrugation of the interfacial potential due to the strong local charge concentrated at fluorine sites, consistent with the Prandtl-Tomlinson model. The monotonic increase of friction with fluorination in experiments also demonstrates that friction force measurements provide a sensitive local probe of the degree of fluorination. Additionally, we found a transition from ordered to disordered atomic stick-slip upon fluorination, suggesting that fluorination proceeds in a spatially random manner.
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