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Quantum Dots in a Polymer Composite: A Convenient Particle-in-a-Box Laboratory Experiment

Rice, Charles V ; Giffin, Guinevere A

Journal of Chemical Education, June 2008, Vol.85(6), p.842 [Periódico revisado por pares]

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  • Título:
    Quantum Dots in a Polymer Composite: A Convenient Particle-in-a-Box Laboratory Experiment
  • Autor: Rice, Charles V ; Giffin, Guinevere A
  • Assuntos: Scientific Concepts ; Chemistry ; Quantum Mechanics ; Laboratory Experiments ; Science Experiments ; Science Instruction ; Science Laboratories ; Measurement Techniques ; Light ; Spectroscopy ; Computation ; College Science ; Education ; Chemistry
  • É parte de: Journal of Chemical Education, June 2008, Vol.85(6), p.842
  • Descrição: 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. (Contains...
  • Idioma: Inglês

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