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Strong interactions between Au nanoparticles and TiO2 mesocrystal: highly selective photocatalytic reduction of nitroarenes

机译：Au纳米颗粒与TiO2介晶之间的强相互作用：硝基芳烃的高选择性光催化还原

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摘要

Au/TiO2 mesocrystals (Au/TMCs) were synthesized via a template-free solvothermal approach, followed with in situ photoreduction of gold chloride tetrahydrate for deposition of Au nanoparticles (AuNPs). The microstructure and components of the photocatalysts were characterized with various techniques. The results indicated that the AuNPs selectively anchored on the (101) facet of TiO2 mesocrystals (TMCs). More interestingly, the strong interactions occurred between AuNP and TMC support, due to the formation of a close Schottky heterointerface, combined with Ti-O-Au chemical bonds partially formed. Unexpectedly, it was found that the AuNPs typically aligned with their [111] direction, parallelling to the [101] direction of TMC in many cases. Au/TMCs exhibited high selectivity and activity for the transformation of nitroarenes to corresponding azoxyarenes, which could be attributed to not only the plasmonic effect of AuNPs and the unique superstructure of TMC, but also the highly strong interaction between AuNPs and TMCs through the close Schottky heterointerface.
机译：通过无模板溶剂热方法合成Au / TiO2中间晶体（Au / TMCs），然后原位光还原四水合氯化金以沉积Au纳米颗粒（AuNPs）。用各种技术表征了光催化剂的微观结构和组分。结果表明，AuNPs选择性地锚固在TiO2中间晶体（TMCs）的（101）晶面上。更有趣的是，由于紧密的肖特基异质界面的形成以及部分形成的Ti-O-Au化学键的结合，AuNP与TMC载体之间发生了强烈的相互作用。出乎意料的是，发现在许多情况下，AuNP通常与[111]方向对齐，与TMC的[101]方向平行。 Au / TMCs具有很高的选择性和活性，可以将硝基芳烃转化为相应的氮杂芳烃，这不仅可以归因于AuNPs的等离激元效应和TMC独特的上层结构，还可以归因于AuNPs和TMC之间通过紧密的肖特基基团之间的高度强相互作用。异质接口。

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