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首页> 外文期刊>Chemistry: A European journal >Synthesis, characterization, and photoactivity of Ta_2O _5-Grafted SiO_2 nanoparticles
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Synthesis, characterization, and photoactivity of Ta_2O _5-Grafted SiO_2 nanoparticles

机译：Ta_2O _5-接枝的SiO_2纳米粒子的合成，表征和光活性

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Herein, we discuss the synthesis as well as material and photochemical characterization of nanometer-sized Ta_2O_5 decorated, in a controlled fashion, on top of 20 nm diameter SiO_2 particles to yield a composite oxide with a tunable band-gap width. Particular emphasis is paid to control of particle size, and control of the distribution of the overlying oxide. The nanoscale dimension imparts a high surface area and introduces quantum confinement effects that displace the conduction band more negatively and the valence band more positively on the electrochemical scale of potentials. This band shift results in an increase of the number of possible participants in photocatalytic reactions. The band shift is shown to result in an increase in driving force for thermodynamically feasible reactions. By decorating SiO _2 with smaller-sized Ta_2O_5, the interplay of the Lewis acidity of SiO_2 and the contact area between Ta _2O_5 and SiO_2 is utilized to develop a photocatalyst with higher photoactivity than pure Ta_2O_5.
机译：在本文中，我们讨论了以可控的方式在直径为20 nm的SiO_2颗粒上装饰的纳米级Ta_2O_5的合成以及材料和光化学表征，以产生带隙宽度可调的复合氧化物。特别强调控制粒度和控制上层氧化物的分布。纳米级尺寸赋予高表面积，并引入量子限制效应，该效应在电势的电化学尺度上更负地取代了导带，而价态带更正地移位。该带位移导致光催化反应的可能参与者的数量增加。所示的带移导致热力学可行反应的驱动力增加。通过用较小尺寸的Ta_2O_5装饰SiO_2，SiO_2的路易斯酸度与Ta_2O_5和SiO_2之间的接触面积之间的相互作用被用来开发光活性比纯Ta_2O_5高的光催化剂。

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