Separation of Silver Nanocrystals for Surface-enhanced Raman Scattering Using Density Gradient Centrifugation
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第8期
论文作者：Qijin Huang Wenfeng Shen Ruiqin Tan Wei Xu Weijie Song
文章页码：834 - 839
摘 要：One-dimensional silver nanocrystals（AgNCs） have been prepared by a polyol process using sodium hydroxide and nitric acid at a constant silver source concentration.Results indicate that the aciditybasicity plays an important role in silver-nanocrystal formation.Different morphologies of AgNCs were synthesized by changing the NaOH or HNO3 amount.We demonstrate that nearly monodisperse silver nanocrystals can be separated from polydisperse samples using density gradient centrifugation separation（DGCS）.We also demonstrate that the separated AgNCs can be used as substrates for surfaceenhanced Raman scattering（SERS） spectroscopy.The separation approach provides a method of improving the nanocrystal quality produced by large-scale synthetic methods.
Qijin Huang1，Wenfeng Shen1，Ruiqin Tan2，Wei Xu1，Weijie Song1
1. Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences2. Faculty of Information Science and Engineering,Ningbo University
摘 要：One-dimensional silver nanocrystals（AgNCs） have been prepared by a polyol process using sodium hydroxide and nitric acid at a constant silver source concentration.Results indicate that the aciditybasicity plays an important role in silver-nanocrystal formation.Different morphologies of AgNCs were synthesized by changing the NaOH or HNO3 amount.We demonstrate that nearly monodisperse silver nanocrystals can be separated from polydisperse samples using density gradient centrifugation separation（DGCS）.We also demonstrate that the separated AgNCs can be used as substrates for surfaceenhanced Raman scattering（SERS） spectroscopy.The separation approach provides a method of improving the nanocrystal quality produced by large-scale synthetic methods.
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