Identification and Growth Mechanism of ZnS Nanoparticles with Mixed Cubic and Hexagonal Stacking
Identification and Growth Mechanism of ZnS Nanoparticles with Mixed Cubic and Hexagonal Stacking
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DOI：
10.1021/jp902499a
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发表时间：
2009-05
影响因子：
3.7
通讯作者：
Hengzhong Zhang;J. Banfield
中科院分区：
文献类型：
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作者：
Hengzhong Zhang;J. Banfield
以乙酸锌和硫代乙酰胺为原料，在弱酸性溶液中合成了立方相和六方相混合堆积的纳米ZnS，而在碱性溶液中合成了以闪锌矿相为主的纳米ZnS。采用X射线衍射（XRD）和透射电子显微镜对纳米粒子的结构进行了表征。通过对密堆积层的立方和六方随机堆积生成ZnS纳米粒子的方法，对混合堆积纳米ZnS的形成过程进行了数值模拟。数值模拟的堆积分布由立方堆积与六方堆积的概率比确定。采用德拜函数分析法模拟了ZnS纳米颗粒混合堆积的XRD图谱。在混合堆积的纳米ZnS中，不存在纤锌矿（102）峰，而存在纤锌矿（103）峰，这与合成ZnS的XRD结果的特征相匹配。我们得出结论，结晶的ZnS纳米粒子与混合堆叠发生通过生长机制在…
Nano-ZnS with mixed cubic and hexagonal stacking was synthesized via reaction of zinc acetate with thioacetamide in a weakly acidic solution, while nano-ZnS in primarily the sphalerite phase was synthesized in a basic solution. X-ray diffraction (XRD) and transmission electron microscopy were used to characterize the nanoparticle structures. The formation of nano-ZnS with mixed stacking was simulated numerically by generation of ZnS nanoparticles via random cubic and hexagonal stacking of the close packing layers. The numerically simulated stacking distribution is determined by the ratio of the probability of cubic vs hexagonal stacking. XRD patterns of ZnS nanoparticles with mixed stacking were simulated by using Debye function analysis. The wurtzite (102) peak is absent whereas the wurtzite (103) peak is present in nano-ZnS with mixed stacking, matching features of XRD results for synthesized ZnS. We conclude that crystallization of ZnS nanoparticles with mixed stacking occurs via a growth mechanism in ...