Research Article

Nano Research

, Volume 2, Issue 3, pp 192-200

Open Access This content is freely available online to anyone, anywhere at any time.

Facile, noncovalent decoration of graphene oxide sheets with nanocrystals

  • Ganhua LuAffiliated withDepartment of Mechanical Engineering, University of Wisconsin-Milwaukee
  • , Shun MaoAffiliated withDepartment of Mechanical Engineering, University of Wisconsin-Milwaukee
  • , Sungjin ParkAffiliated withDepartment of Mechanical Engineering and the Texas Materials Institute, University of Texas at Austin
  • , Rodney S. RuoffAffiliated withDepartment of Mechanical Engineering and the Texas Materials Institute, University of Texas at Austin
  • , Junhong ChenAffiliated withDepartment of Mechanical Engineering, University of Wisconsin-Milwaukee Email author 

Abstract

Facile dry decoration of graphene oxide sheets with aerosol Ag nanocrystals synthesized from an arc plasma source has been demonstrated using an electrostatic force directed assembly technique at room temperature. The Ag nanocrystal-graphene oxide hybrid structure was characterized by transmission electron microscopy (TEM) and selected area diffraction. The ripening of Ag nanocrystals on a graphene oxide sheet was studied by consecutive TEM imaging of the same region on a sample after heating in Ar at elevated temperatures of 100 °C, 200 °C, and 300 °C. The average size of Ag nanocrystals increased and the number density decreased after the annealing process. In particular, migration and coalescence of Ag nanocrystals were observed at a temperature as low as 100 °C, suggesting a van der Waals interaction between the Ag nanocrystal and the graphene oxide sheet. The availability of affordable graphene-nanocrystal structures and their fundamental properties will open up new opportunities for nanoscience and nanotechnology and accelerate their applications.

http://static-content.springer.com/image/art%3A10.1007%2Fs12274-009-9017-8/MediaObjects/12274_2009_9017_Fig1_HTML.gif

Keywords

Graphene oxide silver nanocrystals hybrid nanostructures nanocrystal ripening