Instant Interfacial Self-Assembly for Homogeneous Nanoparticle Monolayer Enabled Conformal ‘lift on’ Thin Film Technology

Song, Liping, Xu, Bin, Cheng, Qian, Wang, Xiaoyuan, Luo, Xiaoning, Chen, Sherry, Chen, Tao and Huang, Youju (2021) Instant Interfacial Self-Assembly for Homogeneous Nanoparticle Monolayer Enabled Conformal ‘lift on’ Thin Film Technology. Science Advances, 7 (52). ISSN 2375-2548

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Abstract

Thin film fabrication is of great importance in the modern engineering. Here, we propose a universal and conformal thin film technique enabled by the wetting empowered interfacial self-assembly. By tailoring the contact angle of nanoparticle (NP), a NP monolayer can be assembled instantly (within 5 seconds) with an excellent harvesting efficiency (up to 97.5 wt). This self-assembly strategy presents a universal applicability on various materials, e.g. non-metal, metal and core-shell structures, and can achieve a monolayer with same in-plane area as 4-inch wafer in a single process, indicating great potential for scale-up manufacturing. Through a template transfer, we coat the surface of different substrates (plastic, paper, etc.) with the assembled film in a conformal and non-destructive ‘lift-on’ manner and subsequently demonstrate fluorescent micropatterns. This self-assembly strategy has great implications in advancing thin film technology with a user-friendly and cost-effective fashion, for the applications in anti-counterfeiting, actuators, and wearable/flexible electronics

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