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Fabrication of polydimethylsiloxane (PDMS)-Based Flexible Surface-Enhanced Raman Scattering (SERS) Substrate for Ultrasensitive Detection
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Dithiocarbamate-coated SERS substrates: sensitivity gain by partial surface passivation.

Yan Zhao1, James N Newton, Jie Liu

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 19, 2009
PubMed
Summary
This summary is machine-generated.

Controlled surface passivation of nanoporous gold (NPG) enhances surface-enhanced Raman scattering (SERS) activity. Partial passivation boosts sensitivity to analytes like 2-mercaptopyridine (2-MP) by tenfold, enabling selective detection.

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Area of Science:

  • Nanomaterials Science
  • Surface Chemistry
  • Spectroscopy

Background:

  • Nanoporous gold (NPG) exhibits significant surface-enhanced Raman scattering (SERS) potential.
  • Optimizing NPG for SERS requires careful control over surface properties and analyte interactions.
  • Surface passivation strategies can modulate SERS activity and selectivity.

Purpose of the Study:

  • To investigate the effect of controlled surface passivation on the SERS activity of NPG.
  • To enhance analyte sensitivity and enable chemoselective SERS detection.
  • To functionalize passivated NPG for the detection of specific analytes, such as metal ions.

Main Methods:

  • Optimization of unfunctionalized NPG SERS activity using triiodide etching and 2-mercaptopyridine (2-MP) as a probe.
  • Controlled surface passivation of NPG using dimethyldithiocarbamate (Me(2)DTC).
  • Functionalization of passivated NPG with a terpyridine receptor for metal ion detection.

Main Results:

  • Partial surface passivation of NPG with Me(2)DTC increased SERS sensitivity to 2-MP by an order of magnitude.
  • Complete surface saturation with Me(2)DTC decreased SERS sensitivity.
  • DTC-anchored terpyridine functionalization enabled trace-level detection of divalent metal ions via SERS.

Conclusions:

  • Controlled partial surface passivation is a viable strategy to significantly enhance NPG-based SERS sensitivity.
  • This approach allows for the development of chemoselective SERS sensors.
  • Passivated NPG platforms can be tailored for sensitive detection of various analytes, including metal ions.