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Nanoscale optical imaging in chemistry.

Andrew J Wilson1, Dinumol Devasia1, Prashant K Jain2

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Optical imaging techniques beyond fluorescence microscopy offer new ways to study chemical reactions at the single-molecule level. These methods reveal hidden molecular dynamics and reaction heterogeneity, advancing chemical and biochemical process understanding.

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Area of Science:

  • Chemical Physics
  • Nanotechnology
  • Spectroscopy

Background:

  • Single-molecule measurements revolutionize chemical and biochemical process understanding by overcoming limitations of ensemble-averaged techniques.
  • Conventional methods mask crucial molecular-level dynamics and reactivity fluctuations.
  • Sub-diffraction-limited fluorescence imaging has provided mechanistic insights but is limited to reactions involving fluorophores.

Purpose of the Study:

  • To review alternative optical imaging modalities for probing chemical processes with nanoscale or single-molecule resolution.
  • To expand the range of chemical reactions accessible to detailed mechanistic study.
  • To highlight advancements in understanding molecular mechanisms and heterogeneity in chemical activity.

Main Methods:

  • Review of optical imaging techniques beyond fluorescence, including photoluminescence (PL), localized surface plasmon resonance (LSPR) scattering, and surface- and tip-enhanced Raman scattering (SERS/TERS).
  • Demonstration of PL for probing single-nanoparticle chemical transformations.
  • Application of LSPR scattering for tracking nanoscale chemical reactions.
  • Exploration of SERS/TERS for monitoring individual bond-dissociation and bond-formation events.

Main Results:

  • Photoluminescence (PL) properties (luminosity, wavelength, intermittency) can monitor single-nanoparticle chemical transformations.
  • Localized surface plasmon resonance (LSPR) scattering enables tracking of solid-state, interfacial, and near-field-driven reactions at the nanoscale.
  • Surface- and tip-enhanced Raman scattering (SERS/TERS) allows monitoring of individual bond events in surface chemical reactions.
  • Each method provides novel insights into molecular mechanisms and spatial heterogeneity.

Conclusions:

  • Alternative optical imaging modalities significantly broaden the scope of chemical processes studied at the single-molecule or nanoscale level.
  • These techniques provide unprecedented mechanistic insights into complex chemical transformations.
  • Future complementary tools will further enhance nanometer-scale resolution chemical imaging capabilities.