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Kerim M. Gattás Asfura, Ph.D.
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October 17, 2018

Self Assembly of Quantum Dots in 2D

Nanostructured Films / Quantum Dots

Cadmium selenide quantum dots of different particle sizes and surface stabilizing molecules were characterized and self assembled at the air-water interface. Molar absorptivity values of the quantum dots were derived from solution, electron microscopy, and Langmuir film collective measurements. Surface pressure and mixed monolayer systems significantly altered the 2D nanostructured assemblies, which can be deposited onto solid substrates with potential applications for optoelectronic or magnetic devices. Because of quantum confinement effects, the optoelectronic properties of quantum dots are particle size-dependent below the bulk excitonic Bohr radius of the material (4.9-5.6 nm for CdSe). Broad absorption spectra allow the concurrent excitation of multiple particle sizes with one excitation frequency (e.g. 365 nm as illustrated in figure below).

2D self assembly air water interface CdSe quantum dots
Gattás-Asfura, K. M.; Constantine, C. A.; Lynn, M. J.; Thimann, D. A.; Ji, X.; Leblanc, R. M. J. Am. Chem. Soc. 2005, 127, 14640-14646

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