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首页> 外文期刊>Applied Surface Science >Photoemission and energy gap of MgWO_4 particles connecting as nanofibers synthesized by electrospinning-calcination combinations
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Photoemission and energy gap of MgWO_4 particles connecting as nanofibers synthesized by electrospinning-calcination combinations

机译：通过电纺丝-煅烧组合合成的纳米纤维连接的MgWO_4粒子的光发射和能隙

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摘要

Mixtures of magnesium acetate tetrahydrate ((CH_3COO)_2Mg-4H_2O), ammonium tungstate tetrahydrate ((NH_4)_6W_7O_(24)-4H_2O), and poly(vinyl alcohol) with the molecular weight of 72,000 were electrospun through a +15kV direct voltage to form fibers on ground flat aluminum foils. The electrospun fibers of 1.5,3.0, and 4.5 mmol of each starting material containing 1.3 g poly( vinyl alcohol) were further calcined at 500-700 ℃ for 3 h constant length of time. At 500 and 600 ℃ calcination, both monoclinic and anorthic phases of MgWO_4 particles with different sizes connecting as fibrous assemblies were detected. Upon increasing the calcination temperature to 700 ℃, only monoclinic phase of facet nanoparticles interconnecting along the fibrous axes with 4.19 eV indirect band gap and 461 nm photoemission was synthesized. In the present research, formation of MgWZO_4 molecules as well as nucleation and growth of nanoparticles was also proposed.
机译：醋酸镁四水合物（（CH_3COO）_2Mg-4H_2O），钨酸铵四水合物（（NH_4）_6W_7O_（24）-4H_2O）和分子量为72,000的聚乙烯醇的混合物经+ 15kV直流电纺丝至在磨碎的扁平铝箔上形成纤维。将每种含1.3 g聚乙烯醇的原料1.5、3.0和4.5 mmol的电纺丝进一步在500-700℃下煅烧3小时，持续一定的时间。在500和600℃的煅烧下，检测到不同尺寸的MgWO_4颗粒的单斜相和正斜相作为纤维组件连接。在将煅烧温度提高到700℃时，仅合成了沿纤维轴互连的小面纳米颗粒的单斜晶相，其间接带隙为4.19 eV，光发射为461 nm。在本研究中，还提出了MgWZO_4分子的形成以及纳米颗粒的成核和生长。

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  • 来源
    《Applied Surface Science》 |2012年第11期|p.4971-4976|共6页
  • 作者

    Surangkana Wannapop; Titipun Thongtem; Somchai Thongtem;

  • 作者单位

    Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;

    Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand,Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;

    Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand,Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;

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  • 正文语种 eng
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  • 关键词

    MgWO_4 nanofibers; electrospinning; indirect band gap;

    机译：MgWO_4纳米纤维;电纺;间接带隙;

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