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Liquid-activated quantum emission from pristine hexagonal boron nitride for nanofluidic sensing.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Liquids at the atomic scale exhibit unique properties.
  • Studying these properties requires advanced imaging techniques beyond indirect measurements.
  • Existing methods struggle with direct molecular-level observation in extreme confinement.

Purpose of the Study:

  • To develop a novel optical approach for direct molecular imaging and sensing in nanometrically confined liquids.
  • To utilize single-photon emitters on hexagonal boron nitride (hBN) surfaces for this purpose.
  • To investigate molecular dynamics and dielectric properties at the nanoscale interface.

Main Methods:

  • Harnessing fluorescence from single-photon emitters on hexagonal boron nitride (hBN) surfaces.
  • Observing chemisorption of organic solvent molecules onto native hBN surface defects.
  • Analyzing spatially correlated activation of neighboring defects for single-molecule dynamics.
  • Using emitter spectra to determine local dielectric properties.

Main Results:

  • Direct molecular imaging and sensing in nanoconfined liquids achieved using hBN emitters.
  • Single-molecule dynamics at the liquid-solid interface visualized through defect activation.
  • Spectra revealed increasing dielectric order with nanometre-scale confinement.
  • Demonstrated hBN defects as a bridge between nanophotonics and nanofluidics.

Conclusions:

  • Liquid-activated hBN defects enable direct observation of molecular behavior in confined environments.
  • This method provides insights into nanoscale dielectric properties and molecular dynamics.
  • Opens new possibilities for nanoscale sensing and optofluidic applications.