Au-Ag core-shell nanoparticles with controllable shell thicknesses for the detection of adenosine by surface enhanced Raman scattering

被引：56

作者：

Ko, Fu-Hsiang ^{[1
]}

Tai, Ming-Rou ^{[1
]}

Liu, Fu-Ken ^{[2
]}

Chang, Yu-Cheng ^{[3
]}

机构：

[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[2] Natl Univ Kaohsiung, Dept Appl Chem, Kaohsiung 81148, Taiwan

[3] Feng Chia Univ, Dept Mat Sci & Engn, Taichung 40724, Taiwan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2015年 / 211卷

关键词：

Nanoparticles; Seeding growth; Aptamer; Surface enhanced Raman scattering; Adenosine; SWITCHING SIGNALING APTAMERS; HIGHLY SENSITIVE DETECTION; GOLD NANOPARTICLES; PLASMON RESONANCE; SPECTROSCOPY; NANOSHELLS; SUSPENSIONS; MONOLAYERS; PARTICLES; MOLECULES;

D O I：

10.1016/j.snb.2015.01.047

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this study, we report a feasible aqueous chemical method to synthesize Au core-Ag shell nanoparticles (NPs) by seeding growth approach. The concentration of Au NPs plays an important role in growing the different thicknesses of Ag shells. The design of signaling aptamer utilizes the target-induced switching between an aptamer/DNA duplex and an aptamer/target complex. The surface enhanced Raman scattering (SERS) signal was enhanced upon the hybridization of the Raman reporter-labeled DNA released from the target-induced displacement with the captured DNA immobilized on the silicon substrate with Au-Ag core-shell NPs. This substrate with 12.4 nm Ag shell shows high reproducibility, strong enhancement, and a low detection limit (1 nM). The enhancement in DNA-based adenosine detection properties shall be advantageous in applications for other aptamer sensing systems. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：283 / 289

页数：7

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