Crystal-face-selective adsorption of an nanoparticles onto polycrystalline diamond surfaces
Crystal-face-selective adsorption of an nanoparticles onto polycrystalline diamond surfaces
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DOI：
10.1021/la800782r
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发表时间：
2008-07-15
期刊：
影响因子：
3.9
通讯作者：
Kawait, Takeshi
中科院分区：
文献类型：
--
作者：
Kondo, Takeshi;Aoshima, Shinsuke;Kawait, Takeshi
通过自组装结合UV/臭氧处理，在多晶掺硼金刚石（BDD）表面实现了金纳米粒子（AuNPs）的晶面选择性吸附。据我们所知，这是第一个关于晶体表面选择性吸附在无机固体表面的报道。经氢等离子体处理的BDD样品和经过UV/臭氧处理2分钟或更长时间的样品，在柠檬酸还原法制备的AuNP溶液中浸泡后，几乎不吸附AuNP。而经UV/臭氧处理10 s后，样品的（111）面选择性吸附AuNP。紫外/臭氧处理40 ~ 60 s后，样品表面对AuNP均有吸附。这些结果表明，紫外/臭氧处理时间可以控制AuNP的吸附行为。这种现象具有很高的重现性，并应用于两步吸附法，其中不同批次的AuNPs按此顺序吸附在（111）和（100）表面。我们的发现可能对通过简单的宏观程序自下而上的方法制造先进的纳米颗粒基功能材料具有重要价值。
Crystal-face-selective adsorption of Au nanoparticles (AuNPs) was achieved on polycrystalline boron-doped diamond (BDD) surface via the self-assembly method combined with a UV/ozone treatment. To the best of our knowledge, this is the first report of crystal-face-selective adsorption on an inorganic solid surface. Hydrogen-plasma-treated BDD samples and those followed by UV/ozone treatment for 2 min or longer showed almost no adsorption of AuNP after immersion in the AuNP solution prepared by the citrate reduction method. However, the samples treated by UV/ozone for 10 s showed AuNP adsorption on their (111) facets selectively after the immersion. Moreover, the sample treated with UV/ozone for 40-60 s showed AuNP adsorption on the whole surface. These results indicate that the AuNP adsorption behavior can be controlled by UV/ozone treatment time. This phenomenon was highly reproducible and was applied to a two-step adsorption method, where AuNPs from different batches were adsorbed on the (111) and (100) surface in this order. Our findings may be of great value for the fabrication of advanced nanoparticle-based functional materials via bottom-up approaches with simple macroscale procedures.