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Surface Plasmon Modulation in Cu3-P Nanocrystals
Jiyuan Yu1, Zifei Chen1, Heyou Zhang1,2
1ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia.
Nano Letters
|November 6, 2024
Summary
We demonstrate reversible modulation of surface plasmon resonance in copper phosphide (Cu3-P) nanocrystals using electrochemistry. This allows probing changes in nanocrystal structure and carrier density, with potential applications in advanced materials.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Nonstoichiometric copper phosphide (Cu3-P) nanocrystals exhibit unique optical properties.
- Surface plasmon resonance (SPR) is sensitive to the electronic and structural properties of nanomaterials.
Purpose of the Study:
- To demonstrate the modulation of SPR in Cu3-P nanocrystals.
- To investigate the effect of electrochemical potential on SPR.
- To explore the impact of postsynthetic ligand treatment on Cu3-P nanocrystals.
Main Methods:
- Spectroelectrochemical analysis of Cu3-P nanocrystals.
- Application of anodic and cathodic potentials.
- Postsynthetic ligand treatment with alkylthiols.
Main Results:
- Anodic potential caused a blue-shift and increased extinction coefficient of SPR.
- Cathodic potential induced a red-shift and decreased SPR intensity.
- Observed reversible SPR modulation over multiple potential cycles.
- Alkylthiol treatment led to nanocrystal decomposition.
Conclusions:
- SPR in Cu3-P nanocrystals can be reversibly modulated electrochemically.
- SPR serves as a sensitive probe for structural and carrier density changes.
- Ligand choice is critical for nanocrystal stability and SPR characteristics.
