Ultrathin metal and semiconductor films emit multicolor light, for small, thin, flexible, and low-power optical sensing devices

https://phys.org/news/2025-08-ultrathin-metal-semiconductor-emit-multicolor.html

"sandwich gold/ semiconducting copper sulfide nanoparticle layers, then zap with near-IR laser integrated on same chip for <1 trillionth second, causing light re-emission in multiple colors controlled by shifting distance between layers... example for re-emitted light: green = healthy tissue/ blue = scar tissue... environmental sensor woven into clothing/ painted onto walls detects pollutants, gas leaks, pathogens in air/ water, where visible light absorbed by car nitrogen oxide exhaust, UV absorbed by pollutants in water"

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Mixed-dimensional nanowires/nanosheet heterojunction of GaSb/Bi2O2Se for self-powered near-infrared photodetection and photocommunication
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https://phys.org/news/2025-09-nature-nanocage-gold-nanoparticle-reactor.html