Wu Qingmen, Si Mengting, Zhang Bing, Zhang Kang, Li Huanhuan, Mi Longfei, Jiang Yang, Rong Yan, Chen Junling, Fang Yingcui
Department of Vacuum Science and Technology, Hefei University of Technology, Hefei, 230009, People's Republic of China.
Nanotechnology. 2018 Jul 20;29(29):295702. doi: 10.1088/1361-6528/aac031. Epub 2018 Apr 26.
By studying oxidation of AgNPs (Ag nanoparticles) and decomposition of the produced silver oxide, we demonstrate that the localized surface plasmon resonance (LSPR) of AgNPs was damped by AgO produced during oxygen plasma irradiation (OPI). The AgNPs were fabricated by evaporation of high pure silver under high vacuum. The oxidation was conducted in oxygen plasma generated by radio frequency glow discharging in vacuum, and the decomposition was performed by annealing the silver oxide in nitrogen ambient at temperatures ranging from room temperature to 450 °C. Samples were characterized by color, absorption spectra, surface enhanced Raman scattering, x-ray photoelectron spectroscopy, and field emission scanning electron microscopy. The bandgap of the silver oxide was calculated. We propose that AgNPs are only partially oxidized into silver oxide during OPI, and the LSPR of the AgNPs left without being oxidation is strongly damped by the produced silver oxide. This LSPR damping is responsible for the transparency of the sample after OPI for 2 s.
通过研究银纳米颗粒（AgNPs）的氧化以及所生成氧化银的分解，我们证明了在氧等离子体辐照（OPI）过程中产生的氧化银会使AgNPs的局域表面等离子体共振（LSPR）受到阻尼。AgNPs是通过在高真空下蒸发高纯银制备的。氧化过程在真空射频辉光放电产生的氧等离子体中进行，分解过程则是在氮气环境中于室温至450°C的温度范围内对氧化银进行退火处理。通过颜色、吸收光谱、表面增强拉曼散射、X射线光电子能谱和场发射扫描电子显微镜对样品进行表征。计算了氧化银的带隙。我们提出，在OPI过程中AgNPs仅部分被氧化为氧化银，未被氧化而剩余的AgNPs的LSPR会被所生成的氧化银强烈阻尼。这种LSPR阻尼导致了样品在OPI 2秒后的透明度。
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