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Effect of defects and film thickness on the optical properties of ZnO-Au hybrid films

机译：缺陷和膜厚度对ZnO-Au杂交膜的光学性质的影响

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摘要

Electronic structure and optical properties of ZnO(y nm)-Au(10 nm) hybrid films, with y = 20, 50 and 150, have been investigated for effective coupling of surface plasmon resonance (SPR) of Au nanoparticles (NPs) with ZnO band structure to enhance their optical properties. The films have been synthesized by a pulsed laser deposition method and studied by UV-Visible absorption, Raman, Photoluminescence, and X-ray absorption near-edge structural analyses. The effect of defects on coupling of SPR with ZnO band structure has been discussed based on optical and electronic structural studies. The local electronic structure analysis at the O K-edge reveals that, in the thinnest film more unoccupied states are introduced in ZnO due to hybridization of O 2p-Au 5d/6s orbitals. The increased density of states causes the enhanced optical properties of ZnO-Au hybrid films via increasing the population at the conduction band of ZnO. Our experimental findings demonstrate that in the thickest film, the exponential decay of SPR induced local field and defects are the main factors affecting the coupling of SPR with the ZnO band structure.
机译：电子结构和ZnO（Y纳米）-Au（10nm）的杂化膜，其中Y = 20，在50和150，光学特性已被研究用于含ZnO的Au纳米颗粒（NP）的表面等离子共振（SPR）的有效耦合带结构，以提高它们的光学性质。该膜已经通过脉冲激光沉积方法合成，并通过紫外 - 可见吸收，拉曼光谱，光致发光的研究，和X射线吸收近边结构分析。的缺陷与氧化锌的能带结构的SPR耦合效应已经基于光学和电子结构的研究进行了讨论。在将O K边缘局部电子结构分析表明，在最薄的膜更未占用状态在氧化锌由于引入至O 2P-5D的Au / 6S轨道的杂交。状态的密度增加经由ZnO的导带增加的人口使ZnO系混合的Au膜的增强的光学性质。我们的实验研究结果表明，在最厚的膜，SPR的指数衰减引起的局部场和缺陷是影响SPR与氧化锌的能带结构的耦合的主要因素。

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  • 来源
    《RSC Advances》 |2015年第51期|共7页
  • 作者

    Saravanan K.; Krishnan R.; Hsieh S. H.; Wang H. T.; Wang Y. F.; Pong W. F.; Asokan K.; Avasthi D. K.; Kanjilal D.;

  • 作者单位

    Tamkang Univ Dept Phys Tamsui 251 Taiwan;

    Indira Gandhi Ctr Atom Res Mat Sci Grp Kalpakkam 603102 India;

    Tamkang Univ Dept Phys Tamsui 251 Taiwan;

    Natl Tsing Hua Univ Dept Phys Hsinchu 30013 Taiwan;

    Tamkang Univ Dept Phys Tamsui 251 Taiwan;

    Tamkang Univ Dept Phys Tamsui 251 Taiwan;

    Inter Univ Accelerator Ctr Mat Sci Grp New Delhi 110067 India;

    Inter Univ Accelerator Ctr Mat Sci Grp New Delhi 110067 India;

    Inter Univ Accelerator Ctr Mat Sci Grp New Delhi 110067 India;

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  • 正文语种 eng
  • 中图分类 化学;
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