Quantum dots in a polymer composite: A convenient particle-in-a-box laboratory experiment
Quantum dots in a polymer composite: A convenient particle-in-a-box laboratory experiment
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DOI：
10.1021/ed085p842
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发表时间：
2008-06-01
影响因子：
3
通讯作者：
Giffin, Guinevere A.
中科院分区：
文献类型：
--
作者：
Rice, Charles V.;Giffin, Guinevere A.
半导体量子点处于材料科学化学的前沿，在生物成像和光伏技术中得到应用。我们开发了一个简单的实验室实验来测量荧光光谱中的量子点尺寸。基于量子点的练习的一个主要障碍是粒子合成和处理；前者需要危险化学品，而后者可能导致样品降解。我们通过使用商用量子点克服了这些缺点。样品由嵌入聚合物基质中的 CdSe-ZnS 核壳纳米粒子组成。使用荧光分光光度计收集光致发光数据，后续计算非常简单。学生反馈表明，这些实验提供了对量子力学和盒中粒子模型的新理解。我们能够研究光谱学在化学研究中的作用以及光谱线展宽的原因。
Semiconductor quantum dots are at the forefront of materials science chemistry with applications in biological imaging and photovoltaic technologies. We have developed a simple laboratory experiment to measure the quantum-dot size from fluorescence spectra. A major roadblock of quantum-dot based exercises is the particle synthesis and handling; the former requires dangerous chemicals while the later can lead to sample degradation. We overcome these drawbacks by using commercially available quantum dots. The samples are composed of CdSe–ZnS core–shell nanoparticles embedded in a polymer matrix. A fluorescence spectrophotometer is used to collect photoluminescence data and the subsequent calculations are straightforward. Student feedback indicates that these experiments provide a new understanding of quantum mechanics and the particle-in-a-box model. We are able to examine the role of spectroscopy in chemical investigations and a cause of spectroscopic line broadening.