<br>Cu2O/PVP球晶的生长机制和微观结构,RSC Advances

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Cu2O/PVP球晶的生长机制和微观结构
RSC Advances ( IF 3.9 ) Pub Date : 2022-07-11 , DOI: 10.1039/d2ra03302j
Weihao Sun ₁ , Wuzong Zhou ₁

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Cu ₂ O球晶是通过使用Cu(NO ₃ ) ₂作为起始材料和聚乙烯吡咯烷酮(PVP)作为多功能生长剂通过溶剂热法制备的。利用X射线衍射、电子显微镜、能量色散X射线光谱、软X射线发射光谱和红外光谱对不同生长阶段的标本进行了研究。据此提出了Cu ₂ O球晶的形成机理。从层次上看，球晶由沿径向排列的针状亚微米棒组成。亚微米棒是由小的 Cu ₂ O/PVP 球体堆积而成。嵌入的Cu ₂ O纳米晶可以沿[100]方向产生偶极场。它们沉积在带负电的含有 PVP 的球形核的表面，并沿径向自取向。因此，所有 Cu ₂ O 纳米微晶的带正电 (100) 面均面向核心，带负电 (

00）小面转向球晶表面，导致球晶表面带负电。与嵌入聚合物微球中的随机取向的纳米微晶不同，球晶不会经历表面重结晶成单晶壳，因为来自核心的库仑力限制了纳米微晶的局部移动和旋转的潜力。这项工作为球晶的形成及其结构特性提供了新的视角。

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Growth mechanism and microstructures of Cu2O/PVP spherulites

Cu₂O spherulites are solvothermaly fabricated by using Cu(NO₃)₂ as the starting material and polyvinylpyrrolidone (PVP) as a multifunctional growth agent. The specimens at different growth stages are investigated by using X-ray diffraction, electron microscopy, energy dispersive X-ray spectroscopy, soft X-ray emission spectroscopy and infrared spectroscopy. The formation mechanism of Cu₂O spherulites is proposed accordingly. Hierarchically, the spherulites are composed of needle-like submicron-rods lying along the radial orientations. The submicron-rods are constructed by piling up of small Cu₂O/PVP spheres. The embedded Cu₂O nanocrystallites can generate a dipolar field in each along the [100] direction. They deposit at the surface of a negatively charged PVP-containing spherical core, and self-oriented along the radial directions. Therefore, all the Cu₂O nanocrystallites would have their positively charged (100) facet facing to the core and their negatively charged ( [1 with combining macron]

00) facet turning towards to the spherulite surface, leading to a negatively charged surface of spherulites. Unlike randomly oriented nanocrystallites embedded in polymer microspheres, the spherulites would not undergo surface recrystallisation into a single crystal shell due to the restricted potential of local shift and rotation of the nanocrystallites by the Coulomb force from the core. This work provides new perspective towards the formation of spherulites and their structural properties.

更新日期：2022-07-11

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