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Updated: Jun 22, 2026
10:54
Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
Published on: July 8, 2013
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Manipulating Plasmon-Generated Hot Carriers for Photocatalysis.
Yue Hu1, Namodhi Wijerathne1, Md Yeasin Pabel1
1Department of Chemistry and Center for Catalysis, University of Florida, Gainesville, Florida 32611, United States.
Accounts of Chemical Research
|August 1, 2025
Summary
This study enhances solar-to-chemical energy conversion by controlling hot carriers in plasmonic nanocrystals. Strategies like heterojunctions and molecular decoration extend hot carrier lifetimes, boosting photocatalytic efficiency.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Localized surface plasmon resonance (LSPR) in plasmonic nanocrystals offers tunable light absorption for photocatalysis.
- Hot carriers generated by LSPR can drive chemical reactions but often lose energy as heat.
- Efficient solar-to-chemical conversion is challenged by rapid hot carrier relaxation.
Purpose of the Study:
- To develop strategies for controlling plasmon-generated hot carriers in gold (Au) nanocrystals.
- To enhance the lifetime, energy level, and spatial distribution of hot carriers for improved photocatalysis.
- To advance the efficiency of solar energy utilization in chemical reactions.
Main Methods:
- Forming heterojunctions by attaching Au nanocrystals to n-type semiconductors to prolong hot electron lifetimes.
- Decorating Au nanocrystals with redox-active molecules to extend hot hole lifetimes.
- Correlating nanocrystal size and incident light wavelength with reaction activity to tune hot carrier energy levels.
- Utilizing facet-selective adsorption of charged molecules to control hot electron spatial distribution.
Main Results:
- Heterojunctions prolonged hot electron lifetimes via Schottky barrier-induced charge separation.
- Redox-active molecules stabilized hot holes, enabling their participation in reactions.
- Hot carrier energy levels were successfully manipulated by tuning nanocrystal size and light wavelength.
- Control over hot carrier distribution enhanced photocatalytic reactions like oxygen and hydrogen evolution.
Conclusions:
- Strategies for manipulating plasmon-generated hot carriers significantly enhance photocatalytic activity.
- Controlling hot carrier properties opens new reaction pathways and improves solar-to-chemical energy conversion efficiency.
- This work provides a foundation for designing advanced plasmonic photocatalysts.
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