DNA-assembled bimetallic plasmonic nanosensors

Na Li; Andreas Tittl; Song Yue; Harald Giessen; Chen Song; Baoquan Ding; Na Liu

doi:10.1038/lsa.2014.107

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DNA-assembled bimetallic plasmonic nanosensors

Original Articles

- DNA-assembled bimetallic plasmonic nanosensors
- Light: Science & Applications Vol. 3, Issue 4, (2014)
- Affiliations：
  
  1.National Center for Nanoscience and Technology, Beijing 100190, China
  2.4th Physics Institute and Research Center Scope, University of Stuttgart, D-70569 Stuttgart, Germany
  3.Max Planck Institute for Intelligent Systems, D-70569 Stuttgart, Germany
- Author bio：
  
  Professor BQ Ding, National Center for Nanoscience and Technology, No. 11 ZhongGuanCun BeiYiTiao, Beijing 100190, China Email: dingbq@nanoctr.cn
  Dr N Liu, Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germany Email: laura.liu@is.mpg.de
- Funds：
- DOI：10.1038/lsa.2014.107
  CLC：
- Published：2014-12，
  
  Published Online：19 December 2014，
  
  Received：17 June 2014，
  
  Revised：20 September 2014，
  
  Accepted：20 September 2014
- Accepted：
Scan QR Code
Li, N. et al. DNA-assembled bimetallic plasmonic nanosensors. Light: Science & Applications, 3, e226 (2014).
DOI：

Li, N. et al. DNA-assembled bimetallic plasmonic nanosensors. Light: Science & Applications, 3, e226 (2014). DOI： 10.1038/lsa.2014.107.

摘要

Abstract

Plasmonic hybrid nanomaterials are highly desirable in advanced sensing applications. Different components in these materials undertake distinct roles and work collectively. One material component may act as an efficient light concentrator and optical probe

whereas another provides specific chemical or biological functionality. In this work

we present DNA-assembled bimetallic plasmonic nanostructures and demonstrate their application for the all-optical detection of hydrogen. Gold (Au) nanorods are functionalized with DNA strands

which serve both as linkers and seeding sites for the growth of palladium (Pd) nanocrystals and facilitate reliable positioning of Pd satellites around an Au nanorod at an ultrashort spacing in the nanometer range. Dark-field scattering spectra of single Au–DNA–Pd nanorods were recorded during controlled cycles of hydrogen gas exposure

and an unambiguous concentration-dependent optical response was observed. Our method enables

for the first time

the all-optical detection of hydrogen-induced phase-change processes in sub-5-nm Pd nanocrystals at the single-antenna level. By substituting the Pd satellites with other functional materials

our sensor platform can be extended to plasmonic sensing of a multitude of chemical and biological reagents

both in liquid and gaseous phases.

关键词

Keywords

DNA self-assemblyhydrogen sensingpalladiumplasmonics

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