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碳化物纳米晶体的压力诱导组装和凝结

Lingyao Meng¹, Sakun Duwal², J Matthew D Lane²

¹Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, New Mexico 87131, United States.

Journal of the American Chemical Society

|February 12, 2021

概括

高压将甲纳米晶阵列转化为1D和2D纳米结构. 这种压力诱导的凝聚为工程半导体纳米晶体材料和设备提供了一种新方法.

科学领域:

材料科学
纳米技术
固态物理

背景情况:

甲基纳米晶是先进电子和光电子设备的关键组件.
了解它们在压力等外部刺激下的行为对于材料设计至关重要.

研究的目的:

研究硫化 (PbS) 和化 (PbSe) 纳米晶体阵列中的压力诱导的结构和形态变化.
探索压力作为新型纳米结构工程工具的潜力.

主要方法:

在现场同步X射线散射 (广角和小角) 监测原子和中等尺度变化.
传输电子显微镜 (TEM) 以可视化生成的纳米结构.

主要成果:

在高压下观察到PbS和PbSe纳米晶体的可逆立方到正相过渡.
PbS纳米晶体阵列显示了从面中心立方体到板状结构的中等尺度超级格子转变.
TEM揭示了球形纳米晶体的压力诱导凝聚成1D纳米棒和2D纳米板.

结论:

压力是操纵粒子间距和诱导纳米晶体阵列凝聚的有效方法.
这项研究提供了半导体纳米晶体结构在高压下设计和运行的见解.

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