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Gold nanofingers for molecule trapping and detection.

Authors
  • Hu, Min1
  • Ou, Fung Suong
  • Wu, Wei
  • Naumov, Ivan
  • Li, Xuema
  • Bratkovsky, Alexander M
  • Williams, R Stanley
  • Li, Zhiyong
  • 1 Information & Quantum Systems Laboratory, Hewlett-Packard Laboratories, 1501 Page Mill Road, MS1123, Palo Alto, California 94304, USA.
Type
Published Article
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Publication Date
Sep 22, 2010
Volume
132
Issue
37
Pages
12820–12822
Identifiers
DOI: 10.1021/ja105248h
PMID: 20795668
Source
Medline
License
Unknown

Abstract

Here we demonstrate a molecular trap structure that can be formed to capture analyte molecules in solution for detection and identification. The structure is based on gold-coated nanoscale polymer fingers made by nanoimprinting technique. The nanofingers are flexible and their tips can be brought together to trap molecules, while at the same time the gold-coated fingertips form a reliable Raman hot spot for molecule detection and identification based on surface enhanced Raman spectroscopy (SERS). The molecule self-limiting gap size control between fingertips ensures ultimate SERS enhancement for sensitive molecule detection. Furthermore, these type of structures, resulting from top-down meeting self-assembly, can be generalized for other applications, such as plasmonics, meta-materials, and other nanophotonic systems.

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