Multifunctional Microgel Magnetic/Optical Traps for SERS Ultradetection

被引：93

作者：

Contreras-Caceres, Rafael ^{[1
,2
,3
]}

Abade-Cela, Sara ^{[1
,2
]}

Guardia-Giros, Pablo ^{[1
,2
]}

Fernandez-Barbero, Antonio ^{[3
]}

Perez-Juste, Jorge ^{[1
,2
]}

Alvarez-Puebla, Ramon A. ^{[1
,2
]}

Liz-Marzan, Luis M. ^{[1
,2
]}

机构：

[1] Univ Vigo, Dept Quim Fis, Vigo 36310, Spain

[2] Univ Vigo, Unidad Asociada CSIC, Vigo 36310, Spain

[3] Univ Almeria, Dept Fis Aplicada, Almeria, Spain

来源：

LANGMUIR | 2011年 / 27卷 / 08期

关键词：

ENHANCED RAMAN-SPECTROSCOPY; IRON-OXIDE NANOPARTICLES; AG NANOPARTICLES; SCATTERING DETECTION; SINGLE-MOLECULE; COLLOIDS; NANORODS; DITHIOCARBAMATE; SILVER; PH;

D O I：

10.1021/la200266e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on the fabrication of a SERS substrate comprising magnetic and silver particles encapsulated within a poly(N-isopropylacrylamide) (pNIPAM) thermoresponsive microgel. This colloidal substrate has the ability to adsorb analytes from Solution while it is expanded (low temperature) and reversibly generate hot spots upon collapse (high temperature or drying). Additionally, the magnetic functionality permits concentration of the composite particles into small regions, which can be exploited to decrease the amount of material the analysis while improving its SERS detection limit Proof of concept for the sequestration of uncommon molecular systems is demonstrated through the first SERS analysis of pentachlorophenol (PCP), a chlorinated ubiquitous environmental pollutant.

引用

页码：4520 / 4525

页数：6

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