期刊
THIN SOLID FILMS
卷 520, 期 7, 页码 2701-2707出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.11.042
关键词
Ag/Au bimetallic dendrites; Surface enhanced Raman scattering; Copper foil
类别
资金
- National Natural Science Foundation of China [10804101]
- State Key Development Program for Basic Research of China [2007CB815102]
- Science and Technology Development Foundation of Chinese Academy of Engineering Physics [2007B08007]
Dendritic Ag/Au bimetallic nanostructures have been synthesized via a multi-stage galvanic replacement reaction of Ag dendrites in a chlorauric acid (HAuCl4) solution at room temperature. After five stages of replacement reaction, one obtains structures with protruding nanocubes; these will mature into many porous structures with a few Ag atoms that are left over dendrites. The morphological and compositional changes which evolved with reaction stages were analyzed by using scanning electron microscopy, transmission electron microscopy, UV-visible spectroscopy, selected area electron diffraction and energy-dispersive X-ray spectrometry. The replacement of Ag with Au was confirmed. A formation mechanism involving the original development of Ag dendrites into porous structures with the growth of Au nanocubes on this underlying structure as the number of reaction stages is proposed. This was confirmed by surface-enhanced Raman scattering (SERS). The dendritic Ag/Au bimetallic nanostructures could be used as efficient SERS active substrates. It was found that the SERS enhancement ability was dependent on the stage of galvanic replacement reaction. (C) 2011 Elsevier B.V. All rights reserved.
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