Plasmonic DNA-Origami Nanoantennas for Surface-Enhanced Raman Spectroscopy

被引：189

作者：

Kuehler, Paul ^{[1
,2
]}

Roller, Eva-Maria ^{[3
,4
]}

Schreiber, Robert ^{[3
,4
]}

Liedl, Tim ^{[3
,4
]}

Lohmueller, Theobald ^{[1
,2
]}

Feldmann, Jochen ^{[1
,2
]}

机构：

[1] LMU Munchen, Dept Phys, Photon & Optoelect Grp, D-80799 Munich, Germany

[2] LMU Munchen, CeNS, D-80799 Munich, Germany

[3] LMU Munchen, Dept Phys, D-80539 Munich, Germany

[4] LMU Munchen, CeNS, D-80539 Munich, Germany

来源：

NANO LETTERS | 2014年 / 14卷 / 05期

关键词：

DNA origami; plasmonic nanoantennas; SERS; nanoparticles; HOT-SPOTS; FLUORESCENCE ENHANCEMENT; NANOPARTICLE ARRAYS; SCATTERING; NANOSTRUCTURES; MOLECULE; RESONANCES; ANTENNAS; SHAPES;

D O I：

10.1021/nl5009635

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report that plasmonic nanoantennas made by DNA origami can be used as reliable and efficient probes for surface-enhanced Raman spectroscopy (SERS). The nanoantenna is built up by two gold nanoparticles that are linked together by a three-layered DNA origami block at a separation distance of 6 nm in order to achieve plasmonic coupling and the formation of a plasmonic "hot spot". The plasmonic properties of the hybrid structure are optically characterized by dark-field imaging and polarization-dependent spectroscopy. SERS measurements on molecules that are embedded in the DNA origami that bridges the nanoantenna gap were performed in order to demonstrate the excellent performance of these structures for enhancing spectroscopic signals. A strong enhancement of the Raman signal was recorded from measurements on single hot spots compared to measurements in bulk. Finally, we show that the laser polarization with respect to the dimer orientation has a strong impact on the SEAS performance.

引用

页码：2914 / 2919

页数：6

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