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Plasmon-driven photocatalytic reaction based on gold microsphere array.

Yiyuan Zhang1, Xueyan Wang1, Shipeng Sun1

  • 1The Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Department of Physics, Capital Normal University, Beijing 100048, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 31, 2022
PubMed
Summary

Researchers developed gold microsphere arrays (Au MA) for enhanced plasma-driven photocatalysis. Smaller Au MA exhibited higher catalytic activity due to surface plasmon "hot spots," improving signal reproducibility for quantitative analysis.

Keywords:
Au microsphere arrayCatalytic reactionLocalized surface plasmon resonanceRaman

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Plasma-driven photocatalytic reactions are vital for energy, environmental, and encryption applications.
  • Disordered substrates limit signal reproducibility and quantitative analysis in photocatalysis.
  • Developing ordered micro-nano catalytic substrates is crucial for advancing these fields.

Purpose of the Study:

  • To prepare gold microsphere arrays (Au MA) with controlled particle size and regular arrangement.
  • To investigate the photocatalytic reaction of p-Aminothiophenol (PATP) on Au MA.
  • To explore the influence of Au MA particle size on photocatalytic activity.

Main Methods:

  • Utilized polystyrene (PS) microspheres of two different sizes as templates.
  • Fabricated gold microsphere arrays (Au MA) with homogeneous particle size and regular arrangement.
  • Systematically studied the photocatalytic reaction using p-Aminothiophenol (PATP) as a probe molecule.

Main Results:

  • Smaller Au MA demonstrated significantly higher photocatalytic activity compared to larger ones.
  • Au MA exhibited photocatalytic activity, unlike conventional gold films under identical conditions.
  • Enhanced activity is attributed to strong surface plasmon "hot spots" in the interparticle interstices of Au MA.

Conclusions:

  • Ordered gold microsphere arrays provide a superior platform for plasma-driven photocatalysis.
  • Particle size is a critical factor influencing catalytic activity in Au MA.
  • The findings offer theoretical and practical insights for micro-nano array catalytic substrate development.