贵金属纳米晶的可控制备及其在SERS中的应用
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- 英文论文题名：Controlled Synthesis of Noble Metal Nanocrystals for SERS Applications
- 论文作者：刘红坡 ; 张蕾 ; 刘侠侠 ; 刘凯 ; 高传博
- 英文论文作者：Hongpo Liu ; Lei Zhang ; Xiaxia Liu ; Kai Liu ; Chuanbo Gao ; Frontier Institute of Science and Technology ; Xi'an Jiaotong University
- 年：2016
- 作者机构：西安交通大学前沿科学技术技术研究院;
- 论文关键词：贵金属纳米材料 ; 设计合成 ; 置换反应的抑制 ; 表面增强拉曼光谱 ; 纳米间隙结构
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十六分会：纳米材料合成与组装
- 语种：中文
- 分类号：TB383.1;O657.37
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十六分会 ; 纳米材料合成与组装
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：169k
- 原文格式：D
- 会议级别：全国
摘要
传统贵金属纳米材料的合成方法较难实现简便、大批量和严格可控的材料制备,成为制约该类材料应用的重要因素。针对这一问题,我们发展了一类独特的"基于配位作用的种晶生长体系",通过在贵金属纳米材料合成体系中引入适当的配体,显著降低了贵金属盐的还原电位,抑制了晶体生长过程中自成核现象的发生,从而实现了贵金属纳米晶严格可控的生长。基于这一方法,实现了形貌可控、尺寸连续可调的金、银纳米球和纳米片的一步法合成。在双金属纳米晶的合成中,抑制了置换反应的发生,实现了一系列以相对活泼的金属为核、贵金属为壳的新型纳米结构的可控制备(Fig.1a)。另外,针对这些材料在表面增强拉曼光谱(SERS)中的应用,我们设计了多种纳米间隙结构,如金纳米框架和多孔金纳米球等,显著提高了分子检测的灵敏度(Fig.1b);通过合金化等策略,制备了兼具稳定性和优异的光学活性的金银合金纳米球胶体,实现了较高的检测灵敏度和可靠性(Fig.1c)。
A perfect synthesis of noble metal nanoparticles should be simple, scalable, and able to generate uniform products with widely-tunable sizes and shapes, which however has been a challenge in conventional synthesis, impeding them from many practical applications. In our effort to solve this problem, we developed a unique coordination-based seeded growth system. By introducing proper ligands, the reduction potential of noble metal salts can be significantly reduced, which suppresses self-nucleation events and thus enables strictly-controlled growth of the noble metal nanocrystals. Based on this method, we have achieved a one-pot synthesis of Au/Ag nanocrystals with continuously-tunable sizes, and a novel class of bimetallic nanocrystals with a noble metal as the shell and a less-stable metal as the core without involving galvanic replacement. For surface-enhanced Raman scattering(SERS) applications, nanostructures have been designed such as noble metal nanogap structures(e.g., Au nanoframes and porous nanospheres) for improved sensitivity of the analysis, and Au-Ag alloy nanospheres for combined sensitivity and reliability.
A perfect synthesis of noble metal nanoparticles should be simple, scalable, and able to generate uniform products with widely-tunable sizes and shapes, which however has been a challenge in conventional synthesis, impeding them from many practical applications. In our effort to solve this problem, we developed a unique coordination-based seeded growth system. By introducing proper ligands, the reduction potential of noble metal salts can be significantly reduced, which suppresses self-nucleation events and thus enables strictly-controlled growth of the noble metal nanocrystals. Based on this method, we have achieved a one-pot synthesis of Au/Ag nanocrystals with continuously-tunable sizes, and a novel class of bimetallic nanocrystals with a noble metal as the shell and a less-stable metal as the core without involving galvanic replacement. For surface-enhanced Raman scattering(SERS) applications, nanostructures have been designed such as noble metal nanogap structures(e.g., Au nanoframes and porous nanospheres) for improved sensitivity of the analysis, and Au-Ag alloy nanospheres for combined sensitivity and reliability.
引文
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[2]Liu,H.;Liu,T.;Zhang,L.;Han,L.;Gao,C.;Yin,Y.Adv.Funct.Mater.2015,25:5435.
[3]Zhang.L.;Liu,T.;Liu,K.;Han,L.;Yin,Y.;Gao,C.Nano Lett.2015,15:4448.
[2]Liu,H.;Liu,T.;Zhang,L.;Han,L.;Gao,C.;Yin,Y.Adv.Funct.Mater.2015,25:5435.
[3]Zhang.L.;Liu,T.;Liu,K.;Han,L.;Yin,Y.;Gao,C.Nano Lett.2015,15:4448.