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Potential-Scanning Localized Surface Plasmon Resonance Sensor.

Hiroyasu Nishi1, Sayaka Hiroya1, Tetsu Tatsuma1

  • 1Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.

ACS Nano
|June 2, 2015
PubMed
Summary

This study introduces potential-scanning localized surface plasmon resonance (LSPR) sensors. These novel plasmonic nanoparticle sensors offer miniaturization and cost reduction for chemical and biosensing applications.

Keywords:
LSPR sensorgold nanoparticlepotential scanningrefractive indexsingle-wavelength measurements

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Electrochemistry

Background:

  • Localized surface plasmon resonance (LSPR) sensors utilize plasmonic nanoparticles for sensing.
  • Conventional LSPR sensors often require wavelength scanning, limiting miniaturization and increasing costs.

Purpose of the Study:

  • To propose and demonstrate a novel potential-scanning LSPR sensor.
  • To enable sensing applications without mechanical wavelength scanning devices.
  • To explore miniaturization and cost reduction in LSPR sensor technology.

Main Methods:

  • Developing a potential-scanning LSPR sensor where electron density is controlled via potential scanning.
  • Utilizing gold nanospheres (13 or 40 nm) and nanorods on an ITO electrode.
  • Demonstrating refractometry by observing resonance peak shifts with changing local refractive index.

Main Results:

  • The potential-scanning LSPR sensor exhibits a resonance peak that shifts with local refractive index.
  • Smaller nanospheres offer a wider dynamic range, while larger nanospheres provide higher sensitivity.
  • Gold nanorods further enhance sensor sensitivity and figure of merit.

Conclusions:

  • Potential-scanning LSPR sensors provide a viable alternative to wavelength-scanning sensors.
  • The proposed sensor design is advantageous for miniaturization and cost-effective sensor development.
  • This technology opens new avenues for advanced affinity biosensors and chemical sensors.