期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 678, 期 -, 页码 541-548出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.261
关键词
PtNi alloys; Reduced graphene oxide; Graphene nanocomposites; Magnetic properties
资金
- CONACYT-Mexico [CB-239354]
- Universidad Autonoma de Nuevo Leon (UANL) [PAICYT IT-934-11]
- Research Center for Exotic Nanocarbons, Japan
- Excellence, JST
Nanocomposites of reduced graphene oxide (RGO) with PtNi nanoparticles were obtained by in situ thermal reduction of a physical mixture of GO and metallic precursors. RGO and PtNiRGO nano composites were studied by differential thermal analysis and thermogravimetry, Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), as well as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The method presented here is a one-step thermal reduction procedure that allows the deposition of bimetallic PtNi nanoparticles with tetragonal crystalline structure and particle size ranging from 3 nm to 30 nm on RGO. The magnetic properties of the RGO and PtNiRGO nanocomposites were measured by vibrating sample magnetometry, which revealed that the RGO exhibited diamagnetism at room temperature and paramagnetism at temperatures below 10 K. PtNiRGO nanocomposites show hysteresis and ferromagnetic ordering at room temperature with a Curie temperature of 658 K. In addition, its magnetic properties at low temperature were strongly influenced by the paramagnetic contribution of RGO and the morphology of the bimetallic nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.
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