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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Re-examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots
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Re-examination of the Size-Dependent Absorption Properties of CdSe Quantum Dots

机译：CdSe量子点的尺寸依赖性吸收特性的重新检查

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摘要

We investigate the size-dependent optical absorption coefficients of CdSe nanocrystals at both the band-edge and high within the absorption profile. The absorption properties in both of these regions must be self-consistent to ensure accuracy of the measured coefficients. By combining transmission electron microscopy and inductively coupled plasma-optical emission spectroscopy, we map out the optical absorption properties and establish reliable size-dependent band-edge calibration curves. The measured absorption properties are compared to a simple 0D confinement model, to classical theory based on light absorption by small particles in a dielectric medium and to state-of-the-art atomistic semiempirical pseudopotential modeling. The applicability of these newly established calibration curves is demonstrated by analyzing the nucleation and growth kinetics of CdSe nanocrystals in solution.
机译：我们研究了在吸收带内和带边和高处CdSe纳米晶体的尺寸依赖性光吸收系数。这两个区域中的吸收特性必须是自洽的，以确保测量系数的准确性。通过结合透射电子显微镜和电感耦合等离子体发射光谱，我们绘制了光吸收特性并建立了可靠的尺寸依赖性带边校准曲线。将测得的吸收特性与简单的0D限制模型，基于介电介质中小颗粒的光吸收的经典理论以及最新的原子半原子伪势模型进行了比较。通过分析溶液中CdSe纳米晶体的成核和生长动力学，证明了这些新建立的校准曲线的适用性。

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