期刊
CARBON
卷 61, 期 -, 页码 543-550出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.05.032
关键词
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资金
- CNPq
- CAPES
- Brazilian Network on CNT Research
- NENNAM (PRONEX Fundacao Araucaria/CNPq)
- National Institute of Science and Technology of Carbon Nanomaterials (INCT-Nanocarbono)
We describe a route to graphene/silver nanoparticles composites based on the targeted chemical thiolation of graphene oxide (GO), followed by a chemical reduction in the presence of Ag+ cations. The carboxylic groups on the GO surface were selectively modified with cysteamine (CA) through amide bonds, and the free thiol groups remaining in CA were further used as capping agent for silver nanoparticles, preventing particle aggregation in the preparation of graphene/silver nanoparticles composites. Characterizations were carried out by infrared and Raman spectroscopy, thermogravimetric analysis, X-ray diffraction and transmission electron microscopy, confirming both the targeted chemical modification and the composite formation. Results show that increasing functionalization of GO with CA give smaller and more homogenous silver nanoparticles, with mean diameter of similar to 5 nm. Therefore, the modified GO has potential in size controlling the silver nanoparticles, essential for the design of novel composites with promising applications in catalysis, surface enhanced Raman scattering and bactericide activity. (C) 2013 Elsevier Ltd. All rights reserved.
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