Bandgap engineering of TiO2 nanotube photonic crystals for enhancement of photocatalytic capability,CrystEngComm

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Bandgap engineering of TiO2 nanotube photonic crystals for enhancement of photocatalytic capability
CrystEngComm ( IF 2.6 ) Pub Date : 2020/01/07 , DOI: 10.1039/c9ce01828j
Jian-Feng Li _{1,

2,

3,

4,

5} , Jian Wang _{1,

2,

3,

4,

5} , Xiao-Tian Wang _{1,

2,

3,

4,

5} , Xiao-Gang Wang _{1,

2,

3,

4,

5} , Yan Li _{1,

2,

3,

4,

5} , Cheng-Wei Wang _{1,

2,

3,

4,

5}

Affiliation

The slow photon effect can significantly increase the effective optical path length of light and thereby enhance the interaction of light with matter, which would be realized by light propagating at the edges of the photonic band gap (PBG) in photonic crystals (PCs). In this paper, a novel anodic oxidation method with effective voltage-pulse compensation was developed to prepare one-dimensional titania nanotube photonic crystals (1D TiO₂ NT PCs) with a high quality of PBG, which could be continuously adjusted and precisely tailored just by modulating the anodization parameters. With the increase of low voltage (L_v) duration, the precise blue shift of the PBG of 1D TiO₂ NT PCs was recorded. Through the precise tailoring of PBG in bandgap engineering, the edges of the PBG could be designed and purposely tuned to overlap with the electronic band gap range of the TiO₂ material, and the as-prepared 1D TiO₂ NT PCs were used as a photocatalyst to degrade methyl orange (MO) molecules due to the enhanced slow photon effect and scattering effect in their highly ordered channel structures. Meanwhile, strategies to enhance the slow photon effect at the edge of the PBG were discussed and evaluated in detail according to our experimental and simulated results. This study would provide a new guide to taking advantage of the slow photon effect to enhance the photocatalytic activities, photoluminescence, and performances of other optoelectronic devices.

中文翻译：

TiO2纳米管光子晶体的带隙工程用于增强光催化能力

缓慢的光子效应可以显着增加光的有效光程长度，从而增强光与物质的相互作用，这可以通过在光子晶体（PC）中的光子带隙（PBG）边缘传播的光来实现。本文开发了一种具有有效电压脉冲补偿的新型阳极氧化方法，以制备高质量的PBG的一维二氧化钛纳米管光子晶体（一维TiO ₂ NT PCs），该晶体可以通过连续调整和精确定制来实现。调整阳极氧化参数。随着低压（L _v）持续时间的增加，一维TiO ₂的PBG的精确蓝移记录了NT PC。通过带隙工程中PBG的精确剪裁，可以设计PBG的边缘并进行有针对性的调整，使其与TiO ₂材料的电子带隙范围重叠，并且将所制备的一维TiO ₂ NT PC用作光催化剂。由于其高度有序的通道结构中增强的慢速光子效应和散射效应，可降解甲基橙（MO）分子。同时，根据我们的实验和模拟结果，对增强PBG边缘的慢光子效应的策略进行了讨论和评估。这项研究将为利用慢光子效应增强其他光电子器件的光催化活性，光致发光和性能提供新的指导。

更新日期：2020-03-16

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