Rapid-Heating-Triggered in Situ Solid-State Transformation of Amorphous TiO2 Nanotubes into Well-Defined Anatase Nanocrystals
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Accepted Manuscript (AM)
Author(s)
Gao, Zhonghui
Zhao, Ying
Wang, Haifeng
Wang, Yun
Jiang, Lixue
Xu, Yiming
Xu, Baixiang
Zheng, Lirong
Jin, Chuanhong
Liu, Porun
Yang, Huagui
Zhao, Huijun
Yang, Xianjin
Huang, Yunhui
Year published
2019
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Show full item recordAbstract
Fabrication of nanocrystals from their disordered solid-state precursors represents a new synthetic strategy. Compared to the widely used chemical vapor deposition and wet-chemistry based methods employing gas and liquid phased precursors, the solid-state transformation of disordered solid precursors to highly ordered crystals is a great challenge due to the severely restricted mass transport and inadequate structural directing mechanism. Herein, we report a rapid-heating-triggered in situ solid-state crystal growth method capable of transforming amorphous TiO2 nanotubes into anatase nanocrystals with well-defined facets and ...
View more >Fabrication of nanocrystals from their disordered solid-state precursors represents a new synthetic strategy. Compared to the widely used chemical vapor deposition and wet-chemistry based methods employing gas and liquid phased precursors, the solid-state transformation of disordered solid precursors to highly ordered crystals is a great challenge due to the severely restricted mass transport and inadequate structural directing mechanism. Herein, we report a rapid-heating-triggered in situ solid-state crystal growth method capable of transforming amorphous TiO2 nanotubes into anatase nanocrystals with well-defined facets and uniform sizes within a minute. The results obtained from in situ transmission electron microscopy and three-dimensional phase-field simulation indicate that the basic building blocks are formed through mechanical rupture of an amorphous TiO2 nanotube precursor, followed by an enhanced diffusion and concomitant oriented attachment onto TiO2 crystal nuclei mediated by the fluorine species evolved from the rapid heating. The unique crystal growth demonstrated in this work provides an alternative synthetic means for fabrication of other nanocrystals from solid-state precursors.
View less >
View more >Fabrication of nanocrystals from their disordered solid-state precursors represents a new synthetic strategy. Compared to the widely used chemical vapor deposition and wet-chemistry based methods employing gas and liquid phased precursors, the solid-state transformation of disordered solid precursors to highly ordered crystals is a great challenge due to the severely restricted mass transport and inadequate structural directing mechanism. Herein, we report a rapid-heating-triggered in situ solid-state crystal growth method capable of transforming amorphous TiO2 nanotubes into anatase nanocrystals with well-defined facets and uniform sizes within a minute. The results obtained from in situ transmission electron microscopy and three-dimensional phase-field simulation indicate that the basic building blocks are formed through mechanical rupture of an amorphous TiO2 nanotube precursor, followed by an enhanced diffusion and concomitant oriented attachment onto TiO2 crystal nuclei mediated by the fluorine species evolved from the rapid heating. The unique crystal growth demonstrated in this work provides an alternative synthetic means for fabrication of other nanocrystals from solid-state precursors.
View less >
Journal Title
CRYSTAL GROWTH & DESIGN
Volume
19
Issue
2
Copyright Statement
This document is the Postprint: Accepted Manuscript version of a Published Work that appeared in final form in Crystal Growth & Design, © 2019 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see 10.1021/acs.cgd.8b01604
Subject
Inorganic chemistry
Physical chemistry
Materials engineering