Phase Transformation of GeO2 Glass to Nanocrystals under Ambient Conditions
| Autor: | Yizhong Huang, Bowei Zhang, Xiuying Li, Zhuohao Xiao, Xiang Lin Li, Zhiqiang Wang, Ling Bing Kong, Xin-Yuan Sun, Yongqing Wang, Zexiang Shen |
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| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Materials science Mechanical Engineering Bioengineering 02 engineering and technology General Chemistry Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Chemical reaction 0104 chemical sciences law.invention Amorphous solid Nanocrystal Chemical engineering law Transmission electron microscopy Phase (matter) General Materials Science Crystallization 0210 nano-technology |
| Zdroj: | Nano Letters. 18:3290-3296 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.8b01142 |
| Popis: | Theoretically, the accomplishment of phase transformation requires sufficient energy to overcome the barriers of structure rearrangements. The transition of an amorphous structure to a crystalline structure is implemented traditionally by heating at high temperatures. However, phase transformation under ambient condition without involving external energy has not been reported. Here, we demonstrate that the phase transformation of GeO2 glass to nanocrystals can be triggered at ambient conditions when subjected to aqueous environments. In this case, continuous chemical reactions between amorphous GeO2 and water are responsible for the amorphous-to-crystalline transition. The dynamic evolution process is monitored by using in situ liquid-cell transmission electron microscopy, clearly revealing this phase transformation. It is the hydrolysis of amorphous GeO2 that leads to the formation of clusters with a size of ∼0.4 nm, followed by the development of dense liquid clusters, which subsequently aggregate to fa... |
| Databáze: | OpenAIRE |
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