Facile, Noncovalent Decoration of Graphene Oxide Sheets with Nanocrystals

被引：149

作者：

Lu, Ganhua ^{[1
]}

Mao, Shun ^{[1
]}

Park, Sungjin ^{[2
,3
]}

Ruoff, Rodney S. ^{[2
,3
]}

Chen, Junhong ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Mech Engn, Milwaukee, WI 53211 USA

[2] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA

[3] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

来源：

NANO RESEARCH | 2009年 / 2卷 / 03期

基金：

美国国家科学基金会;

关键词：

Graphene oxide; silver nanocrystals; hybrid nanostructures; nanocrystal ripening; GRAPHITE OXIDE; FILMS; NANOPARTICLES; CONDUCTIVITY; REDUCTION; CATALYSTS; ISLANDS; GROWTH; MODEL;

D O I：

10.1007/s12274-009-9017-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 degrees C, 200 degrees C, and 300 degrees 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 degrees 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.

引用

页码：192 / 200

页数：9

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