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Nanoparticle-Film Plasmon Ruler Interrogated with Transmission Visible Spectroscopy.

Ryan T Hill1, Klaudia M Kozek1, Angus Hucknall1

  • 1Department of Biomedical Engineering, Department of Electrical and Computer Engineering, Center for Metamaterials and Integrated Plasmonics, and Center for Biologically Inspired Materials and Material Systems, Duke University , Durham, North Carolina 27708, United States.

ACS Photonics
|December 27, 2014
PubMed
Summary
This summary is machine-generated.

Plasmonic nanorulers (PNRs) are now compatible with aqueous sensing. This advancement allows for user-friendly, high-throughput characterization of angstrom-scale distance changes using standard spectrophotometers.

Keywords:
3D printinglocalized surface plasmon resonanceplasmon couplingplasmon rulerplasmonicssensor

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Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Materials Science

Background:

  • Plasmonic nanorulers (PNRs) offer powerful sensing capabilities but face challenges in fabrication and high-throughput characterization.
  • Existing PNR platforms often require expensive microscopy, limiting their widespread adoption.
  • Previous work demonstrated nanoparticle-film (NP-film) PNRs for high-yield fabrication and ensemble characterization.

Purpose of the Study:

  • To adapt NP-film PNRs for aqueous sensing applications using transmission localized surface plasmon resonance (LSPR) spectroscopy.
  • To enable high-throughput, user-friendly characterization of nanoscale distance changes in aqueous environments.
  • To demonstrate the PNR's capability in measuring angstrom-scale changes in polyelectrolyte layers and self-assembled monolayers.

Main Methods:

  • Developed cuvette-compatible slide holders for NP-film PNRs to enable transmission LSPR measurements.
  • Utilized standard spectrophotometers for extinction measurements to probe coupled NP-film resonance.
  • Calibrated NP-film PNRs in aqueous solution to measure dynamic, angstrom-scale distance variations.

Main Results:

  • Successfully adapted NP-film PNRs for aqueous sensing using transmission LSPR spectroscopy.
  • Demonstrated angstrom-scale distance change measurements in polyelectrolyte layers as thin as one layer.
  • Characterized pH-induced swelling of polyelectrolyte layers and self-assembled monolayers.

Conclusions:

  • NP-film PNRs are now compatible with aqueous sensing studies via transmission LSPR spectroscopy.
  • This adaptation simplifies PNR use, making them more accessible for various sensing applications.
  • The developed method facilitates user-friendly, high-throughput nanoscale metrology in solution.