Facile preparation of Au/Ag bimetallic hollow nanospheres and its application in surface-enhanced Raman scattering |
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Authors: | Zao Yi Xibin Xu Xibo LiJiangshan Luo Weidong WuYongjian Tang Yougen Yi |
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Institution: | a College of Physical Science and Technology, Central South University, Changsha 410083, China b Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China |
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Abstract: | 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. |
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Keywords: | Au/Ag bimetallic hollow nanospheres Surface-enhanced Raman scattering Rhodamine 6G |
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