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首页> 外文期刊>Journal of Materials Research >Photocatalytic growth and plasmonic properties of Ag nanoparticles on TiO_2 films
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Photocatalytic growth and plasmonic properties of Ag nanoparticles on TiO_2 films

机译：TiO_2薄膜上Ag纳米粒子的光催化生长及其等离子体性能。

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摘要

Using nanoparticulate TiO_2 films, the photocatalytic growth of Ag nanoparticles (NPs) in the AgNO_3 aqueous solution has been studied in terms of reduction, nucleation, and coalescence. It was proved that Ag primary particles were formed in a growth time of ＜ 1 s after the photocatalysis started. The growth dynamics was found to be critical for isotropic and anisotropic growth of Ag NPs, depending on the AgNO_3 concentration and surface properties of TiO_2 films. In the AgNO_3 solutions of ≤300 mg/L, the isotropic growth dominates the growth dynamic behavior, producing irregularly spherical Ag NPs. In the AgNO_3 solutions of ≥400 mg/L, the increased reduction rate promotes the formation of Ag nanoplates in the product. Ostwald ripening and oriented attachment were suggested to be the mechanisms dominating the isotropic and anisotropic growth, respectively. A photocatalytic growth model of Ag NPs was proposed by taking Ag atom and Ag~+ ion diffusion into consideration. The plasmonic properties of the Ag-TiO_2 films were studied in terms of extinction, surface enhanced Raman scattering, and fluorescence enhancement.
机译：利用纳米颗粒TiO_2薄膜，从还原，成核和聚结方面研究了Ag纳米颗粒（NPs）在AgNO_3水溶液中的光催化生长。事实证明，光催化开始后，在小于1 s的生长时间内就形成了Ag初级颗粒。发现生长动力学对于Ag NPs的各向同性和各向异性生长至关重要，这取决于AgNO_3的浓度和TiO_2薄膜的表面性质。在≤300mg / L的AgNO_3溶液中，各向同性生长控制着生长动力学行为，产生不规则球形的Ag NP。在≥400mg / L的AgNO_3溶液中，增加的还原速率会促进产物中Ag纳米板的形成。奥斯特瓦尔德成熟和定向附着被认为是分别控制各向同性和各向异性生长的机制。考虑到Ag原子和Ag〜+离子的扩散，提出了Ag NPs的光催化生长模型。从消光，表面增强拉曼散射和荧光增强等方面研究了Ag-TiO_2薄膜的等离子体特性。

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  • 来源
    《Journal of Materials Research》 |2015年第2期|304-314|共11页
  • 作者

    Shuai Li; Qiang Tao; Da-Wei Li; Kun Liu; Qing-Yu Zhang;

  • 作者单位

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China;

    Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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