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Ultrafast Charge Injection in Silver-Modified Graphitic Carbon Nitride.

Emma K Orcutt1, Shelton J Varapragasam1, Zöe C Peterson1

  • 1Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana 59717, United States.

ACS Applied Materials & Interfaces
|March 17, 2023
PubMed
Summary
This summary is machine-generated.

Silver nanoparticles enhance graphitic carbon nitride (gCN) photocatalysis by facilitating electron transfer, improving excited-state lifetimes and mitigating efficiency losses from defects.

Keywords:
co-catalystelectron transfergraphitic carbon nitridesilversurface plasmon resonancetime-resolved photoluminescencetransient absorption spectroscopy

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Spectroscopy

Background:

  • Graphitic carbon nitride (gCN) is a promising organic photocatalyst.
  • Its efficiency is limited by short excited-state lifetimes due to defects.
  • The role of metal co-catalysts in gCN reactivity is not fully understood.

Purpose of the Study:

  • To investigate the excited-state dynamics of gCN and silver-modified gCN.
  • To elucidate the mechanism of enhancement by silver co-catalysts.
  • To provide spectral evidence of electron transfer.

Main Methods:

  • Ultrafast transient absorption spectroscopy.
  • Time-resolved photoluminescence spectroscopy.
  • Comparison of pristine gCN and silver-modified gCN.

Main Results:

  • Direct spectral evidence of ultrafast electron transfer from gCN to silver nanoparticles was observed.
  • Electron transfer rates were found to be competitive with non-radiative decay pathways.
  • Electron transfer yields approached 50% in silver-modified gCN.

Conclusions:

  • Silver nanoparticles effectively enhance gCN photocatalysis by facilitating electron transfer.
  • This electron transfer mitigates excited-state decay caused by trap and defect sites.
  • Silver modification offers a viable strategy to improve gCN photocatalytic efficiency.