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Published on: December 21, 2015
Pressure-induced structural transition in WO3 nanowires.
Jian Chen1, Shanghui Chen, Dongyu Lu
1Instrumental Analysis & Research Center, Sun Yat-sen University, Guangzhou 510275, China. puscj@mail.sysu.edu.cn
Summary
Tungsten oxide (WO(3)) nanowires were studied under high pressure using Raman spectroscopy. Four phase transitions were observed at lower pressures than bulk WO(3), with a new, irreversible high-pressure phase appearing.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Tungsten oxide (WO(3)) is a versatile material with applications in catalysis, sensors, and electrochromic devices.
- Understanding the high-pressure behavior of WO(3) is crucial for predicting its stability and potential applications under extreme conditions.
- Nanostructured materials often exhibit different properties compared to their bulk counterparts due to surface and quantum confinement effects.
Purpose of the Study:
- To investigate the high-pressure phase transitions of WO(3) nanowires using Raman spectroscopy.
- To compare the high-pressure behavior of WO(3) nanowires with that of bulk WO(3).
- To identify and characterize any new high-pressure phases in WO(3) nanowires.
Main Methods:
- Raman spectroscopic analysis was conducted on WO(3) nanowires at room temperature.
- High pressures were applied ranging from ambient conditions up to 45 GPa.
- The pressure dependence of the first-order Raman signal was analyzed.
Main Results:
- A linear dependence of the first-order Raman signal on pressure was observed.
- Four distinct phase transitions occurred in WO(3) nanowires at approximately 1.7, 4.6, 21.5, and 26.2 GPa.
- These transition pressures are lower than those reported for bulk WO(3).
- A novel high-pressure phase (HP5) was observed at 42.5 GPa, which was not reversible upon pressure release.
Conclusions:
- WO(3) nanowires exhibit distinct high-pressure phase transitions compared to bulk WO(3).
- The observed phase transitions are influenced by the nanostructure of WO(3).
- A new, irreversible high-pressure phase (HP5) in WO(3) nanowires has been identified, expanding the understanding of its high-pressure behavior.
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