Plasmon Enhanced Direct Bandgap Emissions in Cu7S4@Au2S@Au Nanorings

Nanostructured copper sulfides, promising earth‐abundant p‐type semiconductors, have found applications in a wide range of fields due to their versatility, tunable low bandgap, and environmental sustainability. The synthesis of hexagonal Cu7S4@Au2S@Au nanorings exhibiting plasmon enhanced emissions at the direct bandgap is reported. The synthesized Cu7S4@Au2S@Au nanorings show greatly enhanced absorption and emission by local plasmons compared to pure copper sulfide nanoparticles. Hexagonal Cu7S4@Au2S@Au nanorings are synthesized and plasmonically enhanced emission is demonstrated at the direct bandgap in copper sulfides. Plasmon enhanced direct band transitions of hexagonal Cu7S4@Au2S@Au nanorings exhibit enhanced absorption, scattering, and photoluminescence.