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A review on plasmonic metal-TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

机译：等离子体金属-TiO2复合材料用于光催化系统中光生电子在肖特基结上的产生，捕获，存储和动态矢量转移的综述

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The titania based nanomaterials are an attractive candidates for energy and environmental applications. TiO2 is one of the most important photocatalyst for its special multiple characteristics like high reactivity, low toxicity, low cost, high flexibility, long term stability especially in aqueous medium, shows relatively high energy conversion efficiency, easy to prepare several modifications with various morphologies, with good recycle ability, favorable band edge positions and superior physicochemical and optoelectronic properties. However, large band gap of titania and massive charge carrier recombination impairs its wide photocatalytic applications. As an alternative to various strategies reported extensively in literature, noble metal deposition on the titania surface seems to be effective and reliable method for increasing the life time of excitonic pairs and to extend the band gap absorption to visible range of the solar spectrum. In this focused review, we discuss the fundamental and critical issues in the photocatalytic activity of metal deposited titania taking into consideration the influence of various parameters like preparation methods, metal dispersion on titania, formation of heterojunctions and optimum metal loadings on the interfacial charge carrier dynamics. The metal deposition onto the varied hierarchical morphology, crystal structure, defective surface of titania along with extended modification like simultaneous doping and heterostructure coupling with other semiconductors is also highlighted. It was revealed that deposited metal is involved in multiple crucial roles like; (i) it serves as passive electron sink with high capacity to store electrons to suppress photogenerated charge carrier recombination; (ii) it facilitates rapid dioxygen reduction to generate reactive free radicals; (iii) visible light response for titania can be achieved through surface plasmon resonance effect; (iv) direct excitation of metal nanoparticles especially under visible light and vectorial electron transfer to the TiO2 CB. This review attempts to provide a comprehensive update of design and fabrication of metallization on the surface of TiO2 semiconductor particles highlighting some of the advancements made in the energy and environment applications. © 2015 Elsevier B.V. All rights reserved.
机译：基于二氧化钛的纳米材料是能源和环境应用的有吸引力的候选材料。 TiO2以其高反应性，低毒性，低成本，高柔韧性，长期稳定性等多种特殊特性而成为最重要的光催化剂之一，尤其是在水性介质中，具有相对较高的能量转换效率，易于制备多种形态的改性，具有良好的回收能力，良好的带边缘位置以及优异的理化和光电性能。然而，二氧化钛的大带隙和大量的载流子重组损害了其广泛的光催化应用。作为在文献中广泛报道的各种策略的替代方法，在二氧化钛表面上沉积贵金属似乎是增加激子对寿命和将带隙吸收扩展到太阳光谱可见范围的有效且可靠的方法。在此重点综述中，我们讨论了金属沉积的二氧化钛的光催化活性中的基本和关键问题，并考虑了各种参数的影响，例如制备方法，金属对二氧化钛的分散，异质结的形成以及最佳金属负载对界面电荷载流子动力学的影响。还强调了金属沉积到变化的分层形态，晶体结构，二氧化钛有缺陷的表面以及诸如与其他半导体同时掺杂和异质结构耦合等扩展修饰的情况。据揭示，沉积金属参与多种关键作用，如； （i）它用作高能存储电子以抑制光生电荷载流子复合的无源电子沉； （ii）促进快速的双氧还原以产生反应性自由基； （iii）二氧化钛的可见光响应可通过表面等离子体激元共振效应实现； （iv）直接激发金属纳米粒子，特别是在可见光和矢量电子转移到TiO2 CB的直接激发下。这篇综述试图提供有关TiO2半导体颗粒表面金属化设计和制造的全面更新，重点介绍了在能源和环境应用中取得的一些进步。 ©2015 Elsevier B.V.保留所有权利。

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    Devi, L.G.; Kavitha, R.;

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  • 年度 2016
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