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Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Versatile solution phase triangular silver nanoplates for highly sensitive plasmon resonance sensing.

Denise E Charles1, Damian Aherne, Matthew Gara

  • 1School of Physics, Trinity College Dublin, Ireland .

ACS Nano
|December 25, 2009
PubMed
Summary

Triangular silver nanoplates (TSNP) function as sensitive refractive index sensors. Their sensitivity increases with size and aspect ratio, showing promise for biological sample detection.

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Area of Science:

  • Nanotechnology
  • Plasmonics
  • Sensing

Background:

  • Localized Surface Plasmon Resonance (LSPR) in nanomaterials offers sensing capabilities.
  • Triangular Silver Nanoplates (TSNP) exhibit tunable optical properties.
  • Refractive index sensing is crucial for various scientific applications.

Purpose of the Study:

  • To investigate the sensitivity of TSNP as localized surface plasmon refractive index sensors.
  • To determine the relationship between TSNP structure and LSPR sensitivity.
  • To explore the potential of TSNP for sensing applications in the visible-NIR spectrum.

Main Methods:

  • Fabrication and characterization of 20 TSNP solutions with varying sizes and aspect ratios.
  • Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM), and UV-vis-NIR spectroscopy for structural and optical analysis.
  • Sucrose concentration method to systematically alter the surrounding refractive index.

Main Results:

  • TSNP exhibit tunable LSPR across visible-NIR wavelengths.
  • LSPR sensitivity demonstrated a linear increase with peak wavelength up to 800 nm.
  • Nonlinear sensitivity increase observed in the NIR region, reaching 1096 nm/RIU at 1093 nm.
  • Experimental results confirmed by theoretical calculations (aspect ratio approximation and discrete dipole approximation).

Conclusions:

  • TSNP are highly sensitive refractive index sensors with tunable properties.
  • Nanoplate aspect ratio is a critical parameter for achieving high LSPR sensitivity.
  • TSNP sols are promising for biological sensing applications at specific wavelengths.