Nucleation Kinetics and Structure Evolution of Quasi-Two-Dimensional ZnO at the Air–Water Interface: An In Situ Time-Resolved Grazing Incidence X-ray Scattering Study
Nucleation Kinetics and Structure Evolution of Quasi-Two-Dimensional ZnO at the Air–Water Interface: An In Situ Time-Resolved Grazing Incidence X-ray Scattering Study
复制标题
空气-水界面处准二维 ZnO 的成核动力学和结构演化：原位时间分辨掠入射 X 射线散射研究
DOI：
10.1021/acs.nanolett.2c00300
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Wang, Xudong
中科院分区：
文献类型：
--
作者：
Zhang, Ziyi;Carlos, Corey;Wang, Yizhan;Dong, Yutao;Yin, Xin;German, Lazarus;Berg, Kelvin Jordan;Bu, Wei;Wang, Xudong
设计和合成具有理想形态的高质量二维（2D）材料对于性能控制至关重要。阻碍理解和控制二维晶体成核和生长的一个关键挑战是无法以足够高的时间分辨率直接观察纳米晶体的演化过程。在这里，我们展示了一种原位x射线散射方法，直接揭示了二维纤锌矿ZnO纳米片在空气-水界面的生长。时间分辨掠入射x射线衍射（GID）和掠入射x射线非镜面散射（GIXOS）结果揭示了ZnO纳米片生长过程中的横向和垂直生长动力学切换现象。这种转换代表了二维到三维（3D）晶体结构的演变，这分别决定了纳米片的尺寸和厚度。这种现象可以指导合理控制尺寸和厚度的二维纳米晶体的合成。我们的工作为理解基于时间分辨液体表面掠入射x射线技术的二维纳米材料生长动力学开辟了新的途径。
The design and synthesis of high-quality two-dimensional (2D) materials with desired morphology are essential for property control. One critical challenge that impedes the understanding and control of 2D crystal nucleation and growth is the inability of direct observation of the nanocrystal evolution process with high enough time resolution. Here, we demonstrated anin situX-ray scattering approach that directly reveals 2D wurtzite ZnO nanosheet growth at the air–water interface. The time-resolved grazing incidence X-ray diffraction (GID) and grazing incidence X-ray off-specular scattering (GIXOS) results uncovered a lateral to vertical growth kinetics switch phenomenon in the ZnO nanosheet growth. This switch represents the 2D to three-dimensional (3D) crystal structure evolution, which governs the size and thickness of nanosheets, respectively. This phenomenon can guide 2D nanocrystal synthesis with rationally controlled size and thickness. Our work opens a new pathway toward the understanding of 2D nanomaterial growth kinetics based on time-resolved liquid surface grazing incidence X-ray techniques.