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HomeMaterials Science ForumMaterials Science Forum Vol. 1026Synthesis of Alloyed Au-Ag Nanospheres with...

Synthesis of Alloyed Au-Ag Nanospheres with Tunable Compositions and SERS Enhancement Effects

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Abstract:

Surface-enhanced Raman scattering (SERS) has unique properties including highsensitivity, simple operation and non-destructiveness in trace detection; and the substrate will cast adirect impact upon the SERS signal. An everlasting topic has been focused on the preparation ofSERS substrates with controllable morphologies and hotspots. Herein, we reported a SERS substratewith alloyed Au-Ag nanospheres prepared via a reduction method of two-step seed growth method inliquid phase. TEM, SEM, Raman and UV-vis characterization have been employed to investigatemicro-morphology, composition, and SERS effects. Moreover, a quantitative detection model isestablished, and the R2 of fitting reaches as high as 0.982. Finally, the effect of different nAu/nAg molarratios on the SERS effect is investigated, with results showing that Raman enhancement has a goodrise at the very first beginning, but a drop later appears along with the decreasing nAu/nAg. The limit ofdetection (LOD) of R6G on Au-Ag nanosphere substrates has an initial increase, and a decreasefollows with the decreasing nAu/nAg ratios; the mechanism is also fully investigated. The preparationof particle-sized controllable Au-Ag nanomaterials helps provide a new highly enhanced SERSsubstrate.

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Materials for Modern Technologies VII

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Periodical:

Materials Science Forum (Volume 1026)

Pages:

197-207

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.1026.197

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Online since:

April 2021

Authors:

Bi Jie Xu, Ming Yong Jiang, Xiang Ning Chen, Feng Zhao, Shu Han Du, Hui Yi

Keywords:

Au-Ag Nanosphere, High Sensitivity, Hydrothermal Reduction, Rhodamine 6G (R6G), Surface Enhanced Raman Scattering (SERS)

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