Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Colloidal nanoplatelets are quasi-two-dimensional sheets of semiconductor that can exhibit efficient, spectrally pure fluorescence. These materials were discovered when liquid-phase syntheses of spherical quantum dots were modified. However, despite intense interest in their properties, the mechanism behind their anisotropic shape and precise atomic-scale thickness remains unclear. The underlying growth mechanism is even counterintuitive in the case of the commonly studied CdSe nanoplatelets that arise from an isotropic cubic (zincblende) crystal structure. One proposed explanation is that nanoclusters nucleate within molecular templates that assemble in the reaction solution. These nanoclusters then fuse to form semiconductor sheets. Here, we test this mechanism experimentally for zincblende nanoplatelets. Our results for CdSe and CdS1-xSex nanoplatelets are incompatible with this molecular-template explanation. Instead, we show that a simple growth model can rationalize nanoplatelet formation as well as experimental dependencies on temperature, time, and surfactant length. Such understanding should lead to improved syntheses and broader libraries of nanoplatelet materials.
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