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Nano-tribology studies of reduced graphene oxide films in air and in aqueous solutions with different pH values

Published online by Cambridge University Press:  08 December 2016

Pengfei Li  and
Xianhua Cheng
Pengfei Li
Affiliation:
School of Mechanical and Power Energy Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China; and School of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, People’s Republic of China
Xianhua Cheng*
Affiliation:
School of Mechanical and Power Energy Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China; and State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: xhcheng@sjtu.edu.cn
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Abstract

In this study, three types of graphene films—hydrothermal reduced graphene oxide (GO) film, thermal reduced GO film, and GO film—on silicon substrate by using 3-aminopropyl triethoxysilane (APTES) as the interface adhesive layer were prepared for investigation. The chemical compositions of the samples were characterized by x-ray photoelectron spectroscopy (XPS). Surface morphologies, adhesive forces, and nano friction forces in air and aqueous solutions with different pH values were investigated by atomic force microscopy (AFM). Results showed that capillary force dominated the adhesive force in air condition, and adhesive force was much smaller in aqueous solution than in air due to the disappearance of the capillary force. Adhesive force and friction coefficient of the three samples slightly decreased with the increase of pH values. Hydrothermal reduced GO film exhibits the best lubricity both in air and in liquids among those three films.

Keywords

adhesionself-assemblythin film
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 2 , 27 January 2017 , pp. 323 - 333
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Copyright
Copyright © Materials Research Society 2016 

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