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Title:
Laser-excited optical emission response of CdTe quantum dot/polymer nanocomposite under shock compression
Author: Xiao P(肖攀)
Source: Applied Physics Letters
Issued Date: 2016
Volume: 108, Issue:1, Pages:011908
Abstract:

Laser-driven shock compression experiments and corresponding finite element method simulations are carried out to investigate the blueshift in the optical emission spectra under continuous laser excitation of a dilute composite consisting of 0.15% CdTe quantum dots by weight embedded in polyvinyl alcohol polymer. This material is a potential candidate for use as internal stress sensors. The analyses focus on the time histories of the wavelength blue-shift for shock loading with pressures up to 7.3 GPa. The combined measurements and calculations allow a relation between the wavelength blueshift and pressure for the loading conditions to be extracted. It is found that the blueshift first increases with pressure to a maximum and subsequently decreases with pressure. This trend is different from the monotonic increase of blueshift with pressure observed under conditions of quasistatic hydrostatic compression. Additionally, the blueshift in the shock experiments is much smaller than that in hydrostatic experiments at the same pressure levels. The differences in responses are attributed to the different stress states achieved in the shock and hydrostatic experiments and the time dependence of the mechanical response of the polymer in the composite. The findings offer a potential guide for the design and development of materials for internal stress sensors for shock conditions. (C) 2016 AIP Publishing LLC.

Language: 英语
Indexed Type: SCI
DOI: 10.1063/1.4939701
WOS ID: WOS:000374313000028
Department: LNM材料的分子/细观统计力学行为
Classification: 一类
First Institution (Yes or Not): True
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60703
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Xiao P. Laser-excited optical emission response of CdTe quantum dot/polymer nanocomposite under shock compression[J]. Applied Physics Letters,2016-01-01,108(1):011908.
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