AI Article Synopsis
- Monodisperse colloidal PbS quantum dots with less than 10% size dispersion are crucial for advanced device functionality and are typically produced through a 'bottom-up' method in colloidal chemistry.
- A new 'top-down' approach using laser irradiation allows for the creation of these quantum dots with sizes and dispersions ranging from 5.5% to 9.1%, making it a more environmentally friendly option.
- These quantum dots exhibit size-tunable near-infrared photoluminescence and can self-assemble into organized superlattices due to their low polydispersity and specific surface capping agent.
Article Abstract
Monodisperse colloidal quantum dots with size dispersions <10% are of great importance in realizing functionality manipulation, as well as building advanced devices, and have been normally synthesized via 'bottom-up' colloidal chemistry. Here we report a facile and environmentally friendly 'top-down' strategy towards highly crystalline monodisperse colloidal PbS quantum dots with controllable sizes and narrow dispersions 5.5%<σ<9.1%, based on laser irradiation of a suspension of polydisperse PbS nanocrystals with larger sizes. The colloidal quantum dots demonstrate size-tunable near-infrared photoluminescence, and self-assemble into well-ordered two-dimensional or three-dimensional superlattices due to the small degree of polydispersity and surface capping of 1-dodecanethiol, not only serving as a surfactant but also a sulphur source. The acquisition of monodisperse colloidal PbS quantum dots is ascribed to both the quantum-confinement effect of quantum dots and the size-selective-vaporization effect of the millisecond pulse laser with monochromaticity and low intensity.
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| http://dx.doi.org/10.1038/ncomms2637 | DOI Listing |
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