通过射频氧等离子体辐照提高银纳米颗粒的光催化活性。
Improvement of photocatalytic activity of silver nanoparticles by radio frequency oxygen plasma irradiation.
作者信息
Fang Yingcui, Zhang Bing, Hong Liu, Yao Damao, Xie Zhiqiang, Jiang Yang
机构信息
Department of Vacuum Science and Technology, Hefei University of Technology, Hefei, Anhui, 230009, People's Republic of China.
出版信息
Nanotechnology. 2015 Jul 24;26(29):295204. doi: 10.1088/0957-4484/26/29/295204. Epub 2015 Jul 2.
Photocatalytic activity (PA) of silver nanoparticles (AgNPs) induced by radio frequency (RF) oxygen plasma irradiation (OPI) is investigated in this paper. An improvement in PA by 365% and 181% has been achieved when 15 nm AgNPs irradiated by oxygen plasma for 2 s were used to degrade 10(-5) M Rhodamine 6 G (R6G) under ultraviolet (UV) and visible lights, respectively. The PA caused by OPI is better than that induced by the localized surface plasma resonance (LSPR) of AgNPs. The mechanism for the improvement was explored by scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and UV-vis absorption spectra. The OPI-induced formation of AgO/AgNP and Ag2O/AgNP-heterogeneous photocatalysts and electrophilic oxygen are considered to be responsible for the PA improvement. This investigation deepens our understanding of oxygen-assisted photocatalysis of AgNPs and provides a practical approach using solar light for broad spectra photocatalysis with high efficiency.
本文研究了射频（RF）氧等离子体辐照（OPI）诱导的银纳米颗粒（AgNPs）的光催化活性（PA）。当用氧等离子体辐照2 s的15 nm AgNPs分别在紫外（UV）光和可见光下用于降解10⁻⁵ M罗丹明6G（R6G）时，PA分别提高了365%和181%。OPI引起的PA优于AgNPs的局域表面等离子体共振（LSPR）诱导的PA。通过扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和紫外可见吸收光谱探索了其改善机制。OPI诱导形成的AgO/AgNP和Ag₂O/AgNP异质光催化剂以及亲电氧被认为是PA提高的原因。这项研究加深了我们对AgNPs氧辅助光催化的理解，并提供了一种利用太阳光进行高效广谱光催化的实用方法。
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