Self-cleaning, broadband and quasi-omnidirectional antireflective structures based on mesocrystalline rutile TiO2 nanorod arrays

被引:120
作者
Cai, Jinguang [1 ]
Ye, Jianfeng [1 ]
Chen, Suyue [1 ]
Zhao, Xiaowei [1 ]
Zhang, Dayong [1 ]
Chen, Shuai [1 ]
Ma, Yurong [1 ]
Jin, Song [2 ]
Qi, Limin [1 ]
机构
[1] Peking Univ, Beijing Natl Lab Mol Sci, State Key Lab Struct Chem Unstable & Stable Speci, Coll Chem, Beijing 100871, Peoples R China
[2] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
基金
美国国家科学基金会;
关键词
NANOWIRE ARRAYS; SILICON; COATINGS; ANATASE; GROWTH; POLYCRYSTALLINE; NANOSTRUCTURES; NANOMATERIALS; SUBSTRATE; SURFACES;
D O I
10.1039/c2ee03573a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report excellent broadband and quasi-omnidirectional antireflective (AR) structures based on highly stable, self-cleaning, mesocrystalline rutile TiO2 nanorod arrays, which were grown by a facile hydrothermal synthesis directly on Ti foils. Typically, each hierarchical nanorod is a single-crystal-like rutile TiO2 mesocrystal comprising many [001]-oriented nanotips about 10-30 nm in diameter grown on the top of a [001]-oriented stem nanorod about 100-400 nm in diameter. These novel hierarchical mesostructures exhibit efficient suppression of reflection towards wavelengths ranging from visible to near infrared (NIR) region, with reflection <0.5% in the visible region and <2% in the NIR region, at a wide range of incident angles ranging from nearly normal to 45 degrees. These excellent antireflection properties could be attributed to an optimized graded refractive index profile resulting from the hierarchical tips-on-rod structure of the mesocrystalline nanorods. The chemical and thermal stability of rutile TiO2 endows the prepared mesocrystalline TiO2 AR structures with high stability. Moreover, the AR structures exhibit useful self-cleaning properties either under UV irradiation or through fluorosilane-modification.
引用
收藏
页码:7575 / 7581
页数:7
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