Helium plasma implantation on metals: Nanostructure formation and visible-light photocatalytic response
Helium plasma implantation on metals: Nanostructure formation and visible-light photocatalytic response
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DOI：
10.1063/1.4798597
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发表时间：
2013-04-07
影响因子：
3.2
通讯作者：
Terao, Yoshitaka
中科院分区：
文献类型：
--
作者：
Kajita, Shin;Yoshida, Tomoko;Terao, Yoshitaka
最近发现，低能氦（He）等离子体照射钨（W）会导致钨纳米结构在表面生长。纳米结构的生长过程被认为是氦气泡的自生长过程，有可能开辟一种新的等离子体处理方法。在这里，我们证明了通过暴露于氦等离子体而形成金属纳米结构的过程可以发生在各种金属中，例如钛、镍、铁等。当照射条件改变时，表面会形成内部含有纳米气泡的金属锥体阵列。与W情况不同，在辐照过程中，除了纤维状结构生长之外的其他过程，即物理溅射和大He气泡的生长，可以在其他金属上占主导地位；可能会发生各种表面形态变化。部分被氧化的纳米结构W在可见光（波长> 700 nm）下在没有任何助催化剂的亚甲基蓝脱色中表现出显着的光催化活性。 (C) 2013 年美国物理研究所。 [http://dx.doi.org/10.1063/1.4798597]
It has been found recently that low-energy helium (He) plasma irradiation to tungsten (W) leads to the growth of W nanostructures on the surface. The process to grow the nanostructure is identified as a self-growth process of He bubbles and has a potential to open up a new plasma processing method. Here, we show that the metallic nanostructure formation process by the exposure to He plasma can occur in various metals such as, titanium, nickel, iron, and so on. When the irradiation conditions alter, the metallic cone arrays including nanobubbles inside are formed on the surface. Different from W cases, other processes than growth of fiberform structure, i.e., physical sputtering and the growth of large He bubbles, can be dominant on other metals during irradiation; various surface morphology changes can occur. The nanostructured W, part of which was oxidized, has revealed a significant photocatalytic activity under visible light (wavelength > 700 nm) in decolorization of methylene blue without any co-catalyst. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798597]