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Published on: August 23, 2012
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Black Gold for Broadband Solar Harvesting
Gunjan Sharma1, Vivek Polshettiwar1
1Department of Chemical Sciences, Tata Institute of Fundamental Research (TIFR), Mumbai 40005, India.
Nano Letters
|October 30, 2025
Summary
Black gold, a nanostructure of gold nanoparticles, enhances light absorption for solar energy and catalysis. Its unique design enables efficient light-driven chemical reactions, offering a versatile platform for sustainable transformations.
Area of Science:
- Materials Science
- Nanotechnology
- Photocatalysis
Background:
- Plasmonic coupling in metallic nanoparticles enhances light absorption and light-matter interactions.
- Conventional systems have narrow absorption resonances, limiting efficiency.
- Black gold, gold nanoparticles on nanosilica, offers broadband absorption.
Purpose of the Study:
- To review the design principles, synthesis, and applications of black gold.
- To highlight black gold's potential as a plasmonic platform for sustainable chemical transformations.
- To discuss mechanistic insights into light-driven reactions facilitated by black gold.
Main Methods:
- Synthesis of black gold via cycle-by-cycle or one-pot methods.
- Characterization of tunable nanogaps and particle-size heterogeneity.
- Fabrication of antenna-reactor hybrids (e.g., black gold-Ni, black gold-RuPt).
Main Results:
- Black gold achieves broadband visible-to-near-infrared absorption.
- Dense electromagnetic hotspots are generated, driving efficient light-to-chemical conversion.
- Synergistic effects in hybrids enhance hot-carrier lifetimes and catalytic selectivity.
Conclusions:
- Black gold is a versatile plasmonic platform for sustainable, light-driven chemical transformations.
- Its broadband optical response and adaptability are key advantages.
- Further potential exists for optimizing light-driven chemical processes.
