在现场构建八面体纳米晶体组件的动力路线图
Xin Huang1, Jinlong Zhu2, Binghui Ge3
1Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York 14853, United States.
Journal of the American Chemical Society
|March 9, 2021
概括
研究人员实时观察了纳米晶体 (NC) 组装和相变,揭示了创建有序超级网的新途径. 这项工作使得具有可控超晶体结构的功能材料的可扩展制造成为可能.
科学领域:
- 材料科学
- 纳米技术
- 晶体学
背景情况:
- 控制异型纳米晶体 (NC) 组装成有序的超级晶格对于制造先进的功能材料至关重要.
- 了解NC超级网格形成过程中的实时动力学和相变机制对于可扩展的生产至关重要.
研究的目的:
- 调查异型PbSNCs的实时结晶和生长动态到不同的超级网格.
- 阐明功能性NC材料的动力细节和确定设计参数.
- 从面中心立方 (fcc) 到体中心立方 (bcc) 超格的固体-固体相变的机制.
主要方法:
- 实时观察PbSNC结晶和超级网格的形成.
- 涉及Pb(OA) 2分子和溶剂表面动态的NC组合的分析.
- 从fcc到bcc超格的相变的特征,包括中间状态.
主要成果:
- 在NC组装之前发现了Pb(OA) 2分子的初级片状排序.
- 通过化再结晶机制观察到一个方向失序的fcc超级格子自发转化为一个方向有序的bcc超级格子.
- 对于 fcc (1.23 μm/min) 和 bcc (0.74 μm/min) 阶段的 bcc 阶段形成和生长速度的量化能量减少 (1.16 kBT).
- 实现了大/单个BCC超级晶体的可扩展制造,并控制了转换和定向排序.
结论:
- 这项研究提供了对多个长度尺度的NC组装,核化,生长和相变机制的关键见解.
- 确定了关键参数和可控制,可扩展的功能超级晶体制造的新途径.
- 这项工作为设计和制造各种应用的先进材料和定制的上层结构铺平了道路.
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