Controllable-density nanojunctions as SERS substrates for highly sensitive detection

Controllable-density nanojunctions as SERS substrates for highly sensitive detection
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可控密度纳米结作为 SERS 基底,用于高灵敏度检测

DOI:
10.1016/j.apsusc.2015.02.023
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发表时间:
2015-04
影响因子:
6.7
通讯作者:
Weiyue Zhu
Weiyue Zhu
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhiliang Zhang;Weiyue Zhu

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设计了一种简便有效的方法,用于利用喷墨打印技术制造基于可控密度纳米结的高灵敏度和可重复的SERS活性基底。在该系统中,聚乙烯吡咯烷酮封端的银纳米颗粒(AgNP)被喷墨印刷在基材上,然后浸入氯化钠溶液中。 AgNPs 表面上的封端分子随着氯化物的竞争性吸收而分离,并自发触发在 AgNPs 聚集体之间形成可控密度的纳米结。这些形成的 AgNP 纳米结表现出优异的可控性、重现性,以及罗丹明 6G 探针分子的 1 × 10−11M 水平的检测限。该策略有望构建多种 SERS 传感器,用于化学和生物领域的高灵敏度检测。
A facile and efficient approach was designed to fabricate highly sensitive and reproducible SERS-active substrates based on the controllable-density nanojunctions with ink-jet printing technique. In this system, polyvinylpyrrolidone-capped silver nanoparticles (AgNPs) were ink-jet printed on substrates and subsequently dipped into sodium chloride solution. The capped molecules on the AgNPs surfaces were detached with the competitive absorption of chloride, and spontaneously triggered to form the controllable-density nanojunctions among the AgNPs aggregates. These formed AgNPs nanojunctions demonstrated excellent controllability, reproducibility, and a detection limit of 1 × 10−11M level for Rhodamine 6G probe molecules. This strategy could be expected to construct multifarious SERS sensors for highly sensitive detection in chemical and biological fields.
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