期刊
APPLIED SURFACE SCIENCE
卷 258, 期 1, 页码 212-217出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.08.033
关键词
Au/Ag bimetallic hollow nanospheres; Surface-enhanced Raman scattering; Rhodamine 6G
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]
In this paper, an Au/Ag bimetallic hollow nanostructure was obtained by using SiO2 nanospheres as sacrificial templates. The nanostructure was fabricated via a three steps method. SiO2@Au nanospheres were first synthesized by the layer-by-layer technique, and then they were coated with a layer of Ag particles, finally, the Au/Ag bimetallic hollow nanospheres were obtained by dissolution of the SiO2 core by exposure in HF solution. Several characterizations, such as transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and UV visible absorption spectroscopy were used to investigate the prepared nanostructures. The effectiveness of these Au/Ag bimetallic hollow nanospheres as substrates toward surface-enhanced Raman scattering (SERS) detection was evaluated by using rhodamine 6G (R6G) as a probe molecule. We show that such Au/Ag bimetallic hollow nanospheres structure films which consisting of larger interconnected aggregates are highly desirable as SERS substrates in terms of high Raman intensity enhancement. The Au/Ag bimetallic hollow nanostructured aggregate, interconnected nanostructured aggregate and nanoscale roughness are important factors responsible for this large SERS enhancement ability. (C) 2011 Elsevier B.V. All rights reserved.
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