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Growth mechanism of SnC2H4O2 nanowires prepared by the polyol process as SnO2 precursor nanowires

机译：多元醇过程作为SnO2前体纳米线制备的SNC2H4O2纳米线的生长机理

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摘要

Tin oxide (SnO2) nanowires are produced by the calcination of tin glycolate (SnC2H4O2) nanowires, which are synthesized with tin oxalate (SnC2O4) and ethylene glycol via the so-called polyol process. In this study, the growth mechanism of SnC2H4O2 nanowires was investigated by monitoring the synthesis using scanning and transmission electron microscopy. The length and diameter of the nanowires were 9.25 mm and 0.37 mu m, respectively; the former increased at a rate of 1.85 mu m h(-1) but the latter did not increase over time. Fourier-transform IR spectroscopy showed that the nanowires were composed of SnC2H4O2 instead of SnC2O4. Changes in the components of the reaction solution were also confirmed by H-1 NMR, C-13 NMR, and high-performance liquid chromatography. SnC2H4O2 was formed by the substitution of the oxalate coordinated to tin by ethylene glycolate, which was produced by the deprotonation of ethylene glycol. In this reaction, oxalate gradually changed to formic acid and carbon dioxide, and SnC2H4O2 grew as a nanowire through O-Sn-O bond formation. In addition, when ethylene glycol was mixed with 1,2-propanediol, branched SnC2H4O2 nanowires were formed. The branching was due to the interference of the methyl group of 1,2-propanediol with the growth of bundle-type nanowires. The branched nanowires had a higher surface area-to-mass ratio than the bundled ones based on dispersion measurements. Knowledge of the growth mechanism and reaction conditions that affect morphology would be valuable in modifying the physical and electrical properties of metal oxide nanowires.
机译：通过氧化锡（SNC2H4O2）纳米线制备氧化锡（SNO2）纳米线，其通过所谓的多元醇工艺用锡酸盐（SNC2O4）和乙二醇合成。在该研究中，通过使用扫描和透射电子显微镜监测合成来研究SNC2H4O2纳米线的生长机理。纳米线的长度和直径分别为9.25mm和0.37μm;前者以1.85 mu m h（-1）的速率增加，但后者随着时间的推移没有增加。傅立叶变换的IR光谱显示纳米线由SNC2H4O2而不是SNC2O4组成。还通过H-1 NMR，C-13 NMR和高效液相色谱法确认反应溶液组分的变化。通过将与乙二醇的乙二醇配位的草酸酯取代，通过乙二醇的去质子制备，通过乙二醇的去质子来形成SNC2H4O2。在该反应中，草酸盐逐渐变为甲酸和二氧化碳，并且SNC2H4O2通过O-SN-O键形成纳米线。另外，当将乙二醇与1,2-丙二醇混合时，形成支链SNC2H4O2纳米线。支化是由于1,2-丙二醇的甲基与束型纳米线的生长的干涉。基于分散测量的分支纳米线具有比捆扎的束形式更高。了解影响形态学的生长机制和反应条件对于改变金属氧化物纳米线的物理和电性能来说是有价值的。

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  • 来源
    《RSC Advances》 |2019年第6期|共5页
  • 作者

    Park DongKook; Lee Man Sig;

  • 作者单位

    Korea Inst Ind Technol KITECH Green Mat &

    Proc Grp 55 Jongga Ro Ulsan South Korea;

    Korea Inst Ind Technol KITECH Green Mat &

    Proc Grp 55 Jongga Ro Ulsan South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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