Raman enhancement of biosynthesized Au-Ag bimetallic nanomaterials

doi:10.11949/j.issn.0438-1157.20160484

Abstract

Abstract:

“Green” synthesis of bimetallic nanomaterials has drawn considerable attention in the field of nanotechnology. Au-Ag bimetallic nanomaterials were synthesized using extract of Artocarpus heterophyllus Lam leaves as reducing and capping agent. As a result of greater influence of temperature on nucleation and growth of Ag nanoparticles than the Au nanoparticles, Au-Ag alloys with a ratio of Au to Ag in 3:1 were obtained at 333 K, while alloys with a lower ratio of Au to Ag (1:1) were obtained at 363 K. This influence was illustrated by determining the nucleation and growth of Au and Ag nanoparticles using UV-Vis spectrophotometry method respectively, and it was also confirmed by FTIR analysis that only partial biomolecules were oxidized in the synthesis of Au-Ag (3:1) alloys. Au-Ag bimetallic nanoparticle with a ratio of Au to Ag in 1:1 generated a significant Raman enhancement in probing of Rhodamine 6G.

Key words: nanomaterials, synthesis, kinetic modeling, alloy, bio-reduction

摘要：

以菠萝蜜叶提取液作为保护剂和还原剂制备金银合金纳米颗粒，在333 K和363 K时制备的合金纳米颗粒的金与银的组成比分别约为3：1和1：1。采用紫外-可见分光光度法分别测定金与银纳米颗粒的成核生长动力学，温度对银的成核生长影响更加明显，在363 K时两者成核生长速度相差不到2倍，容易形成比例相当的合金纳米颗粒。对提取液中植物分子反应前后红外分析，得出333 K时有部分银离子没有完全还原而使得合金中相应含量比例较低。而组成约为1：1的合金纳米颗粒在罗丹明的检测中显示出较强的拉曼增强效应。

关键词: 纳米材料, 合成, 动力学模型, 合金, 植物还原法

CLC Number:

TB383

JIANG Xinde, WANG Zhenxi, JIANG Guixian, PENG Yong. Raman enhancement of biosynthesized Au-Ag bimetallic nanomaterials[J]. CIESC Journal, 2016, 67(11): 4906-4911.

江新德, 王振希, 江桂仙, 彭勇. 植物还原法制备Au-Ag合金纳米材料及其拉曼应用[J]. 化工学报, 2016, 67(11): 4906-4911.

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