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首页> 外文期刊>Advanced Functional Materials >Photoluminescent Porous Si/SiO_2 Core/Shell Nanoparticles Prepared by Borate Oxidation
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Photoluminescent Porous Si/SiO_2 Core/Shell Nanoparticles Prepared by Borate Oxidation

机译：硼酸氧化制备光致发光多孔Si / SiO_2核/壳纳米粒子

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摘要

A systematic study on the activation of photoluminescence from luminescent porous silicon nanoparticles (LPSiNPs) by oxidation in aqueous media containing sodium tetraborate (borax) is presented. The treatment promotes surface oxidation of the porous silicon skeleton and consequently generates an electronically passivated material. Photoluminescence is ascribed to quantum confinement effects and to defects localized at the Si-SiO_2 interface, and the strong photoluminescence is attributed to passivation of nonradia-tive surface defects. The oxidation treatment (carried out at 20 ℃) generates a gradual blue shift of the photoluminescence peak wavelength (from 800 nm to 630 nm), while the bandwidth remains relatively constant (≈210 nm). During the treatment period, the external quantum yield (λ_(ex) = 365 nm) of photoluminescence increases to a maximum value of 23% after 200 min, and then it decreases at longer treatment times. The decrease in photoluminescence intensity at longer times is attributed to degradation and dissolution of the nanoparticles, which is inhibited at higher nanoparticle concentrations or by addition of free silicic acid.
机译：提出了在含四硼酸钠（硼砂）的水性介质中通过氧化激活发光多孔硅纳米颗粒（LPSiNPs）的光致发光的系统研究。该处理促进了多孔硅骨架的表面氧化，因此产生了电子钝化材料。光致发光归因于量子约束效应和位于Si-SiO_2界面的缺陷，而强光致发光归因于非辐射性表面缺陷的钝化。氧化处理（在20℃下进行）会产生光致发光峰波长（从800 nm到630 nm）逐渐蓝移，而带宽保持相对恒定（≈210nm）。在治疗期间，光致发光的外部量子产率（λ_（ex）= 365 nm）在200分钟后增加到最大值的23％，然后在更长的治疗时间降低。较长时间的光致发光强度降低归因于纳米颗粒的降解和溶解，这在较高的纳米颗粒浓度下或通过添加游离硅酸得到抑制。

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  • 来源
    《Advanced Functional Materials》 |2014年第36期|5688-5694|共7页
  • 作者

    Jinmyoung Joo; Jose F. Cruz; Sanahan Vijayakumar; Joel Grondek; Michael J. Sailor;

  • 作者单位

    Department of Chemistry and Biochemistry University of California San Diego 9500, La Jolla, CA 92093-0358, USA;

    Department of Chemical Engineering University of California San Diego 9500, La Jolla, CA 92093-0358, USA;

    Department of Mining and Materials Engineering McGill University Montreal, Quebec, Canada;

    Department of Chemistry and Biochemistry University of California San Diego 9500, La Jolla, CA 92093-0358, USA;

    Department of Chemistry and Biochemistry University of California San Diego 9500, La Jolla, CA 92093-0358, USA;

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