Fractal growth of ZrO2 nanoparticles induced by synthesis conditions

Fractal growth of ZrO2 nanoparticles induced by synthesis conditions
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合成条件诱导 ZrO2 纳米粒子的分形生长

DOI:
10.1039/c6ce01916a
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发表时间:
2016
期刊:
影响因子:
3.1
通讯作者:
G. Garnweitner
G. Garnweitner
中科院分区:
化学3区
文献类型:
--
作者:
P. Stolzenburg;A. Freytag;N. C. Bigall;G. Garnweitner

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通过改变纳米颗粒合成过程中的生长条件,可以引起氧化锆纳米颗粒形态和相组成的强烈变化。在这里,我们证明通过改变温度和前体浓度,可以在非水合成中获得具有高比表面积的分形 ZrO2 纳米晶体。详细研究了生长过程,揭示了尺寸从 2.7 纳米增加到 7 纳米,以及多晶型氧化锆从四方到单斜氧化锆的变化。对合成过程中取出的样品进行 TEM 测量表明,颗粒在相变过程中从圆形生长到树枝状。与相变由热力学控制的常见假设相反,我们的数据表明相变实际上是由动力学控制的。
Strong changes in morphology and phase composition of zirconia nanoparticles can be induced by altering the growth conditions during nanoparticle synthesis. Here, we demonstrate that fractal ZrO2 nanocrystals showing high specific surface area can be obtained in the nonaqueous synthesis by variation of temperature and precursor concentration. The growth process was studied in detail revealing a size increase from 2.7 to 7 nm as well as a change in the polymorphic composition from tetragonal to monoclinic zirconia. TEM measurements of samples withdrawn over the course of the synthesis showed that particles grow from roundish to dendritic shapes during the phase transformation. In contrast to the common assumption that the phase transition is controlled by thermodynamics, our data shows that the transition is rather governed by kinetics.
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