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[求助]
帮忙翻译一下这篇文献的前言部分，本人不是搞纳米的，翻译的怕词不达意。
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However, besides the tedious assembly procedures, the sizes of metal nanoparticles in the hollow nanospheres are often limited by these presynthesized metal colloids methods, as a result of the difficulty to prepare and assemble metal nanoparticles smaller than 10 nm. The challenge of fabricating metal nanoparticles with tunable size by a simple and controllable method in hollow nanostructures remains. An alternative strategy for the nanorattles is thepreshell/postcore method, using hollow nanostructures themselves as nanoreactors. One such example is described by Hah and coworkers, Cu@silica rattle type nanostructures were prepared by reducing Cu2+ with hydrazine monohydrate inside the template-synthesized hollow silica nanospheres. For most preshell/postcore methods reported before, the formation of cores usually needs two types of reactants diffusing into the cavity to react. Hence, it is noticeable that these approaches have inherent diffi culty to ensure that the reaction takes place exclusively inside the shells, resulting in a procedure with low efficiency. One unique preshell/postcore methods by Cheng and coworkers reported an easy photoreduction to prepare silver nanoparticles in polypyrrole-chitosan hollow nanospheres. Under ultraviolet photolysis of chitosan, the hydroxymethyl radicals were generated and utilized to reduce the silver ions to metallic silver in the hollow nanospheres. However, the grafting of chitosan in polymer nanoshperes is complicate and ultraviolet irradiation has a diffi culty to scale up. Although some progress on the synthesis of hollow nanospheres with mesoporous shell and metal core has been achieved, most of the methods mentioned above are complex and low efficient.Therefore, in order to make a practical application and ultimate commercialization of these kinds of nanostructure, precise size control of both hollow sphere and metal core via a facile, high efficient and scalable way is still a great challenge. |
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