Micro/Nano‐Pores and Anti‐Fingerprint Coating by Vacancy‐Capture and Interface Intelligent Control

Abstract

Cu dewetting-masking seems limited for large-scale fabrication.The second method is the amphiphobic coating strategy since fingerprint smudging are mainly composed of water and skin oil (sebum). [15] Although the crystal structure of inorganic coatings is conducive to transparency, the chemical stability for current inorganic coatings limited their application. Thus, anti-fingerprint researches mainly focus on organic amphiphobic coatings. A thin film of polyaniline (PANI) nanofibers on the stainless steels with fluoro-thiol modification was prepared through an optimal polymerization time of aniline using HClO 4 as a dopant, showing transparent and anti-fingerprint properties. [16] Sun et al deposited silicon dioxide (SiO 2 ) onto polycarbonate (PC) substrates via the pulse laser deposition, followed by grafted trichloro(1H,1H,2H,2H-perfluorooctyl) silane (PFTS) on the silica surface. [17] Wang et al adopted vapor phase deposition technology to graft 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFDTS) onto glass surfaces modified with chitin nanofibers (ChNFs), achieving water contact angles at 156°and oil contact angles at 97°, respectively. [18] The above research shows that using fluoropolymer to reduce surface energy and controlling surface roughness could simultaneously achieve the hydrophobicity and transparency of organic coatings, which are with potential conflict recognized as one of the most challenging issues for anti-fingerprint coating's designing. [19][20][21][22][23][24] Furthermore, fabricating micro/nano-structure is typically one of the strategies for regulating surface roughness. Cao et al fabricated porous Si films by a convenient gold-assisted electroless etching process, which possess a hierarchical porous structure consisting of micrometer-sized asperities superimposed onto a network of nanometer-sized pores. [25] Bellanger et al synthesized an original series of fluorinated EDOP derivatives as monomers for the elaboration of superoleophobic surfaces by electrochemical polymerization. The authors proposed that the introduction of methylene unit between the EDOP heterocycle and the fluorinated chain turn on/off micro-to nanostructuration. [26] Caruso et al prepared porous silica films with thicknesses of 60≈130 µm and with meso-and macro-scale pores by using both porous membrane templates and amphiphilic supramolecular aggregates as pore-forming agents. [27] Kusakabe et al fabricated porous silica membranes by a sol-gel technique on a γ-aluminacoated α-alumina tube using sols from tetraethoxysilane (TEOS) and octyl-, dodecyl-or octadecyltriethoxysilane. [28] In addition,this work, a simple anti-fingerprint strategy (reduced ≈40-60%) to rearrange fingerprint droplets by patterned micro/nano-pore/spoons texture, air cushion and low surface energy is reported. Superior to previous precise and complex preparation methods, the micro/nano-texture are fabricated through conventional process of spray and dip. The pore and spoon can be freely switched by changing the process. The number (N) and size (r...