Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 7, Pages 2231-2236Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2011.09.011
Keywords
Graphene sheets; Layer-by-layer self-assembly technique; Tribological property
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Funding
- National Natural Science Foundation of China [20823008, 51075384]
- Chinese Academy of Sciences
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A series of graphene sheets (GS)-based multilayer films was constructed in virtue of layer-by-layer electrostatic self-assembly technique based on the negatively charged poly(sodium 4-styrenesulfonate) (PSS) mediated GS (PSS-GS) and the positively charged polyethyleneimine (PEI). High-resolution transmission electron microscope, atomic force microscope and micro-Raman spectrum characterizations demonstrated that the PSS-GS has been synthesized and could be assembled on the single-crystal silicon substrate. Ellipsometric thickness measurement and ultraviolet-visible absorption spectroscope confirmed the successive assemblies of GS. Finally, the macrotribological behaviors of different multilayer films were evaluated on a ball-on-plate macrotribometer and the results indicated that the prepared three- and five-layer films had high load affording ability and long anti-wear life, which could be highly dependent upon the high coverage and excellent self-lubricant properties that the GS owns intrinsically. (C) 2011 Elsevier B. V. All rights reserved.
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