Abstract
Self-assembly of nanocrystals yields wide diversified high-order structures and promises new opportunity for various technological applications. Herein, we developed a facile dip-coating process to fabricate desired patterns of silica nanoparticles with neat edge and high regularity. A micro-pattern of self-assembled monolayer of octadecyltriethoxysilane (OTE) was used as a solution mold for nanoparticle deposition. As a result, self-assembled patterning of nanoparticles could be obtained over wafer-scale areas by using this kind of easy way. Moreover, uniformed mono-layer silica assembly with micro-scale area could be deposited on silicon substrate by tuning the withdrawal speed and concentration of nanoparticle solution. A pre-treatment of vacuum ultraviolet (VUV) irradiation benefits for the orderly arrangement of silica assembly with few cracks. After dip-coating process, super-hydrophilic surface of silica films (<1° of water contact angle) could be also obtained by VUV post-treatment. Furthermore, we directly grew flower-like multi-needle titania on the silica assembly to fabricate SiO2-TiO2 composite bilayer films. Their optical and morphological properties were accessed by UV–vis spectroscopy, X-ray diffraction, and scanning electron microscopy. The composite films have the potential application as enhanced light reflector films.
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