期刊
RSC ADVANCES
卷 4, 期 86, 页码 45856-45861出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra07971j
关键词
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资金
- National Natural Science Foundation of China [51271135]
- program for New Century Excellent Talents in university [NCET-12-0455]
- Fundamental Research Funds for the Central Universities
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2012BAE06B08]
- Innovative Team of Shaanxi Province [2013KCT-05]
Caterpillar-like (CL) Au/Ag nanotubes (NTs) with high surface roughness were synthesized by a simple, rapid route using silver nanowires as sacrificial template and 3,4-dihydroxyphenylalanine (DOPA) as reducing and capping agent. Further experiments revealed that, by simply varying the ratios of the chlorauric acid and DOPA, the surface roughness of the CL Au/Ag NTs could be well controlled. The scanning electron microscope and transmission electron microscopy characterizations confirmed that the main NTs were polycrystalline, whereas the spines on their surface were single crystals. The hollow interior of the NTs was ascribed to the occurrence of the Kirkendall effect during the galvanic reaction between the metallic silver and AuCl4-. The formation of the spines results from the AgCl induced anisotropic growth of gold species. Because of their unique structures, such as a prickly surface and hollow internal tube, the as-prepared CL Au/Ag NTs exhibited a sensitive and reproducible performance in surface enhanced Raman scattering.
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