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Electronically coupled gold nanoclusters (AuNCs) in silica offer enhanced deep-red emission. This unique electronic coupling in AuNC aggregates boosts optical properties, differing from typical aggregation-enhanced emission.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photochemistry

Background:

  • Electronic coupling is key to tuning luminophore electronic states and optical properties.
  • Electronically coupled systems offer unique properties beyond individual components.

Purpose of the Study:

  • To prepare electronically coupled gold nanoclusters (AuNCs) within a porous silica matrix.
  • To investigate the photophysical properties and emission mechanisms of these coupled AuNCs.

Main Methods:

  • Organosilane grafting and sol-gel processing to create a porous silica template.
  • Incorporation and controlled drying of gold nanoclusters within the silica template.
  • Spectroscopic analysis to characterize electronic coupling and emission properties.

Main Results:

  • AuNCs@silica composites showed red-shifted, line-width-narrowed, deep-red emission with high quantum yields (~66%).
  • Electronic coupling enhanced radiative rates and covalent bonding suppressed nonradiative relaxation.
  • A large Stokes shift was observed due to a slight blue shift in absorption maximum.
  • Formation of electronically coupled AuNC aggregates within nanopores, bonded to the silica matrix.

Conclusions:

  • The study demonstrates a novel mechanism for enhanced luminescence in gold nanoclusters through electronic coupling.
  • This approach differs significantly from conventional aggregation-enhanced emission strategies.
  • Controlling packing modes of AuNCs offers potential for engineering advanced photophysical properties.