Photo-grade plasmonic colour printing: back to silver

September 05, 2018 // By Julien Happich
Researchers at the Hong Kong Polytechnic University have revived the use of silver-ion solutions on glass plates and light exposure of old-day black and white photography with a modern twist, revealing silver nanoparticles to form plasmonic colours at microscale patterns.

In a paper titled "Ultrafast Light-Controlled Growth of Silver Nanoparticles for Direct Plasmonic Color Printing" published in the ACS Nano journal, the researchers detail the fabrication of plasmonic structures at large scale. The actual substrate consisted of a titanium dioxide (TiO2 photocatalyst) layered quartz plate, put in contact with a solution of silver nitrate.


Plasmonic colour printing setup for the multiscale
engineering of silver nanoparticles on a TiO2-capped
quartz substrate.

In order to "reveal" specific plasmonic colours, the researchers used a 1920×1080 pixels digital micromirror device and specially-made projection optics to dynamically project predefined UV patterns on the photocatalyst layer, which initiated and regulated the reduction of silver salts into silver nanoparticles of predetermined sizes.

Because each pixel of the UV pattern can be individually controlled (both in the time and spatial domains), the researchers were able to create user-defined micrometer-scale patterns of precisely size-controlled silver nanoparticles, with each specific size distribution yielding a specific plasmonic colour.


s

Vous êtes certain ?

Si vous désactivez les cookies, vous ne pouvez plus naviguer sur le site.

Vous allez être rediriger vers Google.