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首页> 外文期刊>Advanced Functional Materials >One-Step Synthesis and Optical Properties of Benzoate-and Biphenolate-Capped ZrO_2 Nanoparticles
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One-Step Synthesis and Optical Properties of Benzoate-and Biphenolate-Capped ZrO_2 Nanoparticles

机译：苯甲酸酯和双酚盐封端的ZrO_2纳米粒子的一步合成及其光学性质

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A simple one-pot approach based on the "benzyl alcohol route" is used for the preparation of benzoate- and biphenolate-capped zirconia and, benzoate-capped Eu-doped zirconia nanoparticles. Powder X-ray diffraction studies and high- resolution transmission electron microscopy (HR-TEM) showed that the nanoparticles present high crystallinity and uniform particle sizes ranging from 3 to 4 nm. FT-IR and solid state NMR (SS-NMR) studies revealed that the nanoparticles are coated with a large amount of organic species when the reaction temperature is above 300 ℃. It was found that the alcohol used as solvent is oxidized at the surface of the nanoparticles to the respective car-boxylic acid which acts as a stabilizer, controlling the nanoparticles growth. The optical properties of these hybrid nanoparticles were studied by room and low (12K) temperature photoluminescence spectroscopy, time-resolved spectroscopy and absolute emission quantum yield. The as-synthesized benzoate- and biphenolate-capped nanoparticles exhibit interesting emission properties in the UV and blue spectral regions together with values of emission quantum yields much higher than those reported for zirconia nanoparticles of similar size. The photoluminescent properties were attributed to a cooperative effect of the capping ligands and the defects associated to the ZrO_2 nanoparticles. Due to the overlapping of the various emission components involved (i.e., the emission of europium(Ⅲ) intra-4f~6 transitions, defects in the zirconia and capping ligands) a tunable emission color ranging from purplish-pink to greenish-blue could be obtained for the europium-doped zirconia nanoparticles by simply selecting different excitation wavelengths.
机译：一种简单的基于“苯甲醇路线”的一锅法可用于制备苯甲酸酯和双酚盐封端的氧化锆以及苯甲酸酯封端的Eu掺杂氧化锆纳米颗粒。粉末X射线衍射研究和高分辨率透射电子显微镜（HR-TEM）显示，纳米颗粒具有较高的结晶度和3至4 nm的均匀粒径。 FT-IR和固态NMR（SS-NMR）研究表明，当反应温度高于300℃时，纳米颗粒被大量有机物包覆。发现用作溶剂的醇在纳米颗粒的表面被氧化成相应的羧酸，羧酸作为稳定剂，控制纳米颗粒的生长。通过室温和低温（12K）光致发光光谱，时间分辨光谱和绝对发射量子产率研究了这些杂化纳米颗粒的光学性质。合成后的苯甲酸酯和双酚盐封端的纳米颗粒在紫外和蓝色光谱区域显示出令人感兴趣的发射特性，并且发射量子产率的值比报道的相似尺寸的氧化锆纳米颗粒高得多。光致发光性质归因于封端配体的协同作用以及与ZrO_2纳米粒子相关的缺陷。由于所涉及的各种发射成分的重叠（即，-4（Ⅲ）内4f〜6过渡的发射，氧化锆和封盖配体的缺陷）可能会产生从紫粉色到绿蓝色的可调发射颜色。只需选择不同的激发波长，即可获得掺-氧化锆纳米粒子。

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  • 来源
    《Advanced Functional Materials》 |2012年第20期|p.4275-4283|共9页
  • 作者

    Xue Bai; Andrea Pucci; Vania T. Freitas; Rute A. S. Ferreira; Nicola Pinna;

  • 作者单位

    Department of Chemistry, CICECO University of Aveiro 3810-193 Aveiro, Portugal;

    Department of Chemistry, CICECO University of Aveiro 3810-193 Aveiro, Portugal;

    Department of Physics, CICECO University of Aveiro 3810-193 Aveiro, Portugal;

    Department of Physics, CICECO University of Aveiro 3810-193 Aveiro, Portugal;

    Department of Chemistry, CICECO University of Aveiro 3810-193 Aveiro, Portugal,World Class University (WCU) program of Chemical Convergence for Energy & Environment (C2E2) School of Chemical and Biological Engineering College of Engineering Seoul National University (SNU) Seoul 151-744, Korea;

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