Phys.org May 7, 2024
Underwater adhesion processes have faced challenges to uniformly transfer nanoparticles into a monolayer, particularly those below 100 nm in size, over large areas. Researchers in South Korea have developed a scalable “one-shot” self-limiting nanoparticle transfer technique, enabling the efficient transport of nanoparticles from water in microscopic volumes to an entire 2-inch wafer in a remarkably short time of 10 seconds to reach near-maximal surface coverage in a 2D mono-layered fashion. They used proton engineering in electrostatic assembly which accelerated the diffusion of nanoparticles resulting in a hundredfold faster coating speed than the previously reported results in the literature. This process further enabled “pick-and-place” nanoparticle patterning at the wafer scale, with large flexibility in surface materials, including flexible metal oxides and 3D-printed polymers. They demonstrated the fabrication of wafer-scale disordered plasmonic metasurfaces in seconds. The metasurfaces exhibited consistent resonating colors across diverse material and geometrical platforms. According to the researchers their process has the potential for application in full-color painting and optical encryption devices… read more. Open Access TECHNICAL ARTICLE
none. Crédit: Advanced Materials, 24 January 2024