Structural color printings have broad applications due to their advantages of long-term sustainability,eco-friendly manufacturing,and ultra-high resolution.However,most of them require costly and time-consuming fabrication processes from nanolithography to vacuum deposition and etching.Here,we demonstrate a new color printing technology based on polymer-assisted photochemical metal deposition(PPD),a room temperature,ambient,and additive manufacturing process without requiring heating,vacuum deposition or etching.The PPD-printed silver films comprise densely aggregated silver nanoparticles filled with a small amount(estimated＜20％volume)of polymers,producing a smooth surface(roughness 2.5 nm)even better than vacuum-deposited silver films(roughness 2.8 nm)at～4nm thickness.Further,the printed composite films have a much larger effective refractive index n(～1.90)and a smaller extinction coefficient k(～0.92)than PVD ones in the visible wavelength range(400 to 800 nm),therefore modulating the surface reflection and the phase accumulation.The capability of PPD in printing both ultra-thin(～5 nm)composite films and highly reflective thicker film greatly benefit the design and construction of multilayered Fabry-Perot(FP)cavity structures to exhibit vivid and saturated colors.We demonstrated programmed printing of complex pictures of different color schemes at a high spatial resolution of～6.5 μm by three-dimensionally modulating the top composite film geometries and dielectric spacer thicknesses(75 to 200 nm).Finally,PPD-based color picture printing is demonstrated on a wide range of substrates,including glass,PDMS,and plastic,proving its broad potential in future applications from security labeling to color displays.

Shinhyuk Choi;Zhi Zhao;Jiawei Zuo;Hossain Mansur Resalat Faruque;Yu Yao;Chao Wang

School of Electrical,Computer and Energy Engineering,Arizona State University,Tempe,AZ 85287,USA;Biodesign Center for Molecular Design and Biomimetics,Arizona State University,Tempe,AZ 85287,USA;College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,Beijing 100124,China

光：科学与应用（英文版）

[1]Shinhyuk Choi;Zhi Zhao;Jiawei Zuo;Hossain Mansur Resalat Faruque;Yu Yao;Chao Wang-.Structural color printing via polymer-assisted photochemical deposition)[J].光：科学与应用（英文版）,2022(05):796-807

printings

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