Laser printing with structural colors arising from nanostructure-light interaction is emerging as a promising technology to address the problem of toxic compounds in conventional coloration methods. Up to date, the best-performing laser coloration techniques rely on ultrafast pulsed lasers. In this work, we introduce an approach for low-power, wide-gamut laser coloration on a pre-processed metamaterial of self-assembled nanoparticles. The metamaterial, with aluminum-coated polystyrene nanospheres, changes color through oxidation layer and deformation shape control, achieved using a focused CW laser with an average power of 10 mW. This approach achieves a 33k DPI resolution on a flexible substrate with the broadest color gamut reported.
KEYWORDS: Water splitting, Alloys, Solar energy, Oxidation, X-ray photoelectron spectroscopy, Scanning transmission electron microscopy, Sustainability, Solar processes, Nitrogen, Nanofilms
We report a light-induced oxyhydroxides-alloy heterostructure reconfigured from a nickel-iron alloy film as a highly catalytic and protective layer on photoanodes for solar water oxidation. The optimized photoanodes exhibit a high applied bias photon-to-current efficiency of 4.24% and long-term stability beyond 250 hours, outperforming the closest competitors by 330% in efficiency and 408% in stability, respectively. This self-generated catalytic-protective oxyhydroxides-alloy layer coating strategy opens the way to implementing large scalable photoelectrochemical devices for solar fuel production with high efficiency and device lifetime.
This work proposed a universal platform for ultra-sensitive detection, which integrates sensory data acquisition and spectral feature extraction into a single machine learning (ML) hardware.We fabricated and tested the sensing platform in glucose detection tasks, reaching 5 orders of magnitude higher sensitivity compared to the state-of-the-art. This technology requires no bulky spectral measuring devices such as a spectrum analyzer but a standard off-the-shelf camera to achieve real-time detection of the glucose concentration.
While current nanofabrication techniques for manipulating light at the nanoscale focus on specific geometrical patterns using nanopatterning, nanomanufacturing, and lithography, exploring phase-changing media for these purposes remains limited. Our study presents a nanostructuring platform that utilizes nonlinear light-matter interactions to achieve controllable alterations in material geometry and phase. The base material for the platform is an oxide-polymer heterostructure. Laser-induced passivation and reshaping of 2D monolayers of such structures enable gradual phase transitions with resonant optical behavior. This platform shows promise in low-power inkless laser color printing, achieving high-resolution printing with a broad color gamut.
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