Carbon Dot-Functionalized Colloidal Particles for Patterning and Controllable Layer-Structured Photonic Crystals Construction AITranslate

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DOI：https://doi.org/10.1021/acsapm.1c00984

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The cracked morphology and iridescent properties of photonic crystal (PC) films have greatly limited their applications in the field of color pigments and optical instruments. Herein, we fabricated crack-free PC films with a controllable microscopic ordered structure by functionalizing carbon dots (CDs) onto poly(styrene-methyl methacylate-acrylic acid) (P(S-MMA-AA)) particles, enhancing the structural color contrast and saturation. Using the third-generation polyamidoamine (G3-PAMAM) dendrimer as a bridge, the CDs are coupled onto the P(S-MMA-AA) particles through the terminal amino groups of G3-PAMAM. The hydrogen bonds, derived from the grafted G3-PAMAM and CDs, effectively counteract the tensile stress of particle shrinkage during evaporation self-assembly, thereby enabling the formation of high-performance PC films. Moreover, due to the light absorption capacity and nanoscale effect of CDs, the CDs/P(S-MMA-AA) particles could be constructed to form robust PC films without the iridescence effect and effectively suppress the coffee-ring effect, which are developed to the colloidal PC ink for direct writing and patterning. Eventually, based on the Langmuir–Blodgett (LB) method, the CDs/P(S-MMA-AA) PC films with a controllable layer-structure are constructed, achieving the structural color regulation, which is expected to be applied to the design of smart windows.