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Fung66

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[资源] AFM最新一期文章用桥连技术制备enhanced photocatalytic纳米Au/TiO2结构

Au/TiO2这种结构在很多期刊发表过，但是很少对Au/TiO2的结构进行改进，改变的只是Au/TiO2制备方法而已，该文章通过lipoic acid–dopamine bridging linker- 1桥连方法，提高了TiO2的光催化活性.这也许是这文章能被Advanced Functional Materials 接收的原因（一家之言，有不对之处请批评指正）。
文章题目是：Enhanced Photocatalytic Activity of Au/TiO2 Nanocomposite Prepared Using Bifunctional Bridging Linker，全文9页，引文32条。

In the last decade, a number of studies have shown that noble metal NPs enable size dependent storage of electrons, which can then be released to the suitable acceptors. When coupled to semiconducting materials such as TiO2 , noble metal NPs can facilitate the shuttling of the photoexcited conduction band electrons to the species in the solution and so improve the photocatalytic performance as the charge carriers escape the recombination and can be involved in other processes at the nanomaterial interface.
In the presented study we have examined the use of rationally designed bridging linker to enable controlled attachment of Au onto TiO2 NP or in situ synthesis of Au/TiO2 nanocomposite. Further on, we have demonstrated that such a simple synthetic rout allows a production of Au/TiO2 hybrids with well controlled Au loadings. As we are particularly interested in use of this material for bio-activation, we studied the catalytic properties employing the ROS production and enzyme activation to assess the activity enhancement both under UV and visible light irradiation. Moreover, we have shown that the use of Au/TiO2 can enable temporal control over the enzymatic activation under visible light, which could lead to the development of novel bio-catalytic platforms. The synthetic method is simple and allows a good control of both Au NPs size distribution and Au loading range (0.1 to 50%). Although UV light is often used to activate TiO2 based catalysts, the presence of Au NPs enables the use of visible light (lower energy) for activation, which is of particular interest for biological applications. Contrary to previous reports
we have observed that in some hybrids the higher content of Au NPs leads to the increase of the catalytic activity of prepared material when 365 nm light source is used. On the other hand, irradiation with visible light (470 nm) the photocatalytic activity of the hybrids increases with the Au loading. We believe that this type of material would find applications in catalysis, in particular light triggered enzyme activation or waste product removal and our efforts are currently focused on the use of reported and new bi-functional linkers to design hybrid materials with different metallic and oxide NPs for environmental applications.

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