A Metastable Crystalline Phase in Two-Dimensional Metallic Oxide Nanoplates

被引：31

作者：

Liu, Cong ^{[1
,2
]}

Zheng, Lirong ^{[3
]}

Song, Qian ^{[1
,2
]}

Xue, Zhenjie ^{[1
,2
]}

Huang, Chuanhui ^{[1
]}

Liu, Lu ^{[1
]}

Qiao, Xuezhi ^{[1
,2
]}

Li, Xiao ^{[1
,2
]}

Liu, Keyan ^{[1
,2
]}

Wang, Tie ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Key Lab Analyt Chem Living Biosyst, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2019年 / 58卷 / 07期

基金：

美国国家科学基金会;

关键词：

metal oxide nanoparticles; metastable phases; surface unsaturated coordination ratio; thickness; ultrathin nanoplates; NANOCRYSTALS; TRANSFORMATIONS; STRESS;

D O I：

10.1002/anie.201812911

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A simple method was adopted in which ultrathin cerium oxide nanoplates (<1.4nm) were synthesized to increase the surface atomic content, allowing transformation from a face-centered cubic (fcc) phase to a body-centered tetragonal (bct) phase. Three types of cerium oxide nanoparticles of different thicknesses (1.2nm ultrathin nanoplates, 2.2nm nanoplates, and 5.4nm nanocubes) were examined using transmission electron microscopy and X-ray diffraction. The metastable bct phase was observed only in ultrathin nanoplates. Thermodynamic energy analysis confirmed that the surface energy of the ultrathin nanoplates is the cause of the remarkable stabilization of the metastable bct phase. The mechanism of surface energy regulation can be expanded to other metallic oxides, thus providing a new means for manipulating and stabilizing novel materials under ambient conditions that otherwise would not be recovered.

引用

页码：2055 / 2059

页数：5

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