Silver-Based Nanodisk Codes

Silver-Based Nanodisk Codes
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DOI:
10.1021/nn101231u
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发表时间:
2010-09-01
期刊:
影响因子:
17.1
通讯作者:
Mirkin, Chad A.
Mirkin, Chad A.
中科院分区:
材料科学1区
文献类型:
--
作者:
Banholzer, Matthew J.;Osberg, Kyle D.;Mirkin, Chad A.

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我们报道了一种使用在线光刻来合成银基纳米盘码(NDC)结构的新方法,其中我们使用了比用于合成类似金结构的合成和刻蚀条件更温和的条件。在633和532 nm激发下,银结构表现出比金结构更强的表面增强拉曼散射信号,因此,在基于DNA的检测分析中使用时,导致了更低的检测下限。最后,在一个盘代码中使用两种增强纳米结构材料显著提高了编码的信息存储密度。例如,由5个黄金磁盘对组成的磁盘码具有13个唯一的增强图案组合,而具有5个可以是黄金或白银的磁盘对的磁盘码具有98个唯一组合。
We report a novel method for synthesizing silver-based nanodisk code (NDC) structures using on-wire lithography, where we employ milder synthetic and etching conditions than those used to synthesize the analogous gold structures. The silver structures exhibit stronger surface-enhanced Raman scattering signals than their Au counterparts at 633 and 532 nm excitation and, therefore, lead to lower limits of detection when used in the context of DNA-based detection assays. Finally, use of two enhancing nanostructured materials in one disk code dramatically increases the information storage density for encoding. For example, a disk code consisting of 5 gold disk pairs has 13 unique combinations of enhancing patterns, while one with 5 disk pairs that can be either gold or silver has 98.