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Coarsening kinetics of Mn-doped CdSe nanocrystals

机译:锰掺杂CdSe纳米晶的粗化动力学

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CdSe and Mn-doped CdSe nanocrystals were synthesized by the inverse micelle technique using paraffin oil and oleic acid, and they were found to be highly crystalline with the zinc blende structure. The coarsening behavior of the nanocrystals was monitored using the red-shift in UV-visible light absorption peaks, and their size variation was estimated using the quantum confinement theory. The size values were used for the Lifshitz-Slyozov-Wagner (LSW) analyses for the coarsening kinetics. By determining the activation energy (Q) and reaction rate constant (K-o), the coarsening mechanism was identified as surface diffusion of atoms, and the kinetics equation could be completed for both nanocrystals. The Mn-doped CdSe nanocrystals showed faster coarsening kinetics due to the low activation energy barrier for the diffusion.
机译:利用石蜡油和油酸通过反胶束技术合成了CdSe和Mn掺杂的CdSe纳米晶体,发现它们是具有锌共混物结构的高度结晶。使用紫外可见光吸收峰中的红移来监测纳米晶体的粗化行为,并使用量子限制理论估算其尺寸变化。尺寸值用于Lifshitz-Slyozov-Wagner(LSW)分析的粗化动力学。通过确定活化能(Q)和反应速率常数(K-o),可以将粗化机理确定为原子的表面扩散,并且可以完成两个纳米晶体的动力学方程。 Mn掺杂的CdSe纳米晶体由于扩散的活化能垒低而显示出更快的粗化动力学。

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