Nanocrystals with metastable high-pressure phases under ambient conditions

被引：36

作者：

Xiao, Tianyuan ^{[1
]}

Nagaoka, Yasutaka ^{[1
,3
]}

Wang, Xirui ^{[1
]}

Jiang, Tian ^{[1
]}

LaMontagne, Derek ^{[1
]}

Zhang, Qiang ^{[1
]}

Cao, Can ^{[1
,4
]}

Diao, Xizheng ^{[1
]}

Qiu, Jiahua ^{[1
]}

Lu, Yiruo ^{[1
]}

Wang, Zhongwu ^{[2
]}

Cao, Y. Charles ^{[1
]}

机构：

[1] Univ Florida, Dept Chem, Gainesville, FL 32611 USA

[2] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

[3] Brown Univ, Dept Chem, Providence, RI 02912 USA

[4] Brown Univ, Warren Albert Med Sch, Providence, RI 02903 USA

来源：

SCIENCE | 2022年 / 377卷 / 6608期

基金：

美国国家科学基金会;

关键词：

STRUCTURAL TRANSFORMATIONS; SIZE DEPENDENCE; TRANSITION; STABILITY; MECHANISM; WURTZITE; FUSION;

D O I：

10.1126/science.abq7684

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The ambient metastability of the rock-salt phase in well-defined model systems comprising nanospheres or nanorods of cadmium selenide, cadmium sulfide, or both was investigated as a function of composition, initial crystal phase, particle structure, shape, surface functionalization, and ordering level of their assemblies. Our experiments show that these nanocrystal systems exhibit ligand-tailorable reversibility in the rock salt-tozinc blende solid-phase transformation. Interparticle sintering was used to engineer kinetic barriers in the phase transformation to produce ambient-pressure metastable rock-salt structures in a controllable manner. Interconnected nanocrystal networks were identified as an essential structure that hosted metastable high-energy phases at ambient conditions. These findings suggest general rules for transformation-barrier engineering that are useful in the rational design of next-generation materials.

引用

页码：870 / 874

页数：5

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