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首页> 外文期刊>Physica status solidi, B. Basic research >The structural transition behavior of CdSe/ZnS core/shell quantum dots under high pressure
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The structural transition behavior of CdSe/ZnS core/shell quantum dots under high pressure

机译：CdSe / ZnS核/壳量子点在高压下的结构转变行为

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摘要

The structural phase transition of CdSe/ZnS core/shell quantum dots (QDs) has been studied by in situ angle-dispersive X-ray diffraction under high pressure up to 53.6 GPa. The CdSe core transforms from wurtzite to rock-salt structure near 6.3 GPa and then to Cmcm or distorted Cmcm structure probably occurs at 45.1 GPa which has not been observed in CdSe nanomaterials before. The critical pressure from wurtzite to rock-salt and the bulk modulus of rock-salt phase are much higher than those for bulky and uncapped nanoparticle CdSe. The released sample can be kept in rock-salt phase for a certain time, verified by photoluminescence (PL) spectra, quite different from the reversible transition for pure CdSe. A reasonable interpretation of the experimental phenomena is given by comparing the bulk modulus of the core and shell and studying the stress sate of the core after decompression. Our study suggests that capping a hard shell is an effective approach to quench the high pressure phase of nanomaterial with a reversible phase transition.
机译：CdSe / ZnS核/壳量子点（QDs）的结构相变已通过在高达53.6 GPa的高压下原位角分散X射线衍射进行了研究。 CdSe核从纤锌矿转变为6.3 GPa附近的岩盐结构，然后转变为Cmcm或扭曲的Cmcm结构，可能在45.1 GPa时发生，这在以前的CdSe纳米材料中还没有观察到。从纤锌矿到岩盐的临界压力和岩盐相的体积模量比大体积和无盖的纳米CdSe的临界压力高得多。释放的样品可以在岩盐相中保留一定的时间，通过光致发光（PL）光谱验证，与纯CdSe的可逆转变有很大不同。通过比较核和壳的体积模量并研究减压后核的应力状态，可以合理地解释实验现象。我们的研究表明，加盖硬壳是一种有效的方法，可逆性转变具有可逆相变的纳米材料的高压相。

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