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Nanocomposite Route to Ultra-sensitive Surface Enhanced Raman Scattering Substrates

Published online by Cambridge University Press:  01 February 2011

Abhijit Biswas ,
Ilker Bayer  and
Alexandru S. Biris
Abhijit Biswas
Affiliation:
[email protected], University of Notre Dame, Electrical Engineering, Center for Nanoscience and Technology, Notre Dame, Indiana, United States
Ilker Bayer
Affiliation:
[email protected], University of Illinois at Urbana-Champaign, Aerospace Engineering, Urbana, Illinois, United States
Alexandru S. Biris
Affiliation:
[email protected], University of Arkansas at Little Rock, Applied Science, Nanotechnology Center, Little Rock, Arkansas, United States
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Abstract

We show a novel route to prepare SERS substrates, which is based on polymer–metal nanocomposites with a specific structure and composition just below the percolation threshold. The neighboring nanoparticles are still quite densely packed, but remain separated by narrow polymer gaps (<1 nm). Such a nanostructure allows the creation of densely packed hot spots where electromagnetic energy can be confined. The polymer–metal nanocomposites are fabricated by a simple and single-step method of electron-beam-assisted vapor-phase co-deposition. The preparation of the SERS substrates is based on a simple plasma-etching process, which removes the polymer structures that allow the formation of metal nanoparticle SERS nano-aggregates with very uniform and controllable inter-particle gaps. The method results in “ideal SERS hot spots” throughout the matrix. These hot spots can be created over very large areas. The prepared SERS substrates are promising candidates for the direct detection (label-free) and analysis of various biological and chemical samples.

Keywords

biomedicalnanoscalephysical vapor deposition (PVD)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1253: Symposium K – Functional Materials and Nanostructures for Chemical and Bochemical Sensing , 2010 , 1253-K10-27
Copyright
Copyright © Materials Research Society 2010

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