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• W2326370906 startingPage "2387" @default.
• W2326370906 abstract "We report measurements of fluorescence intermittency (blinking) and spectral behavior for single semiconductor nanocrystal quantum dots (QDs) isolated in the gas phase and discuss the effects on fluorescence of the QD charge state and heating to the point of sublimation. Core–shell CdSe/ZnS QDs were trapped in a quadrupole ion trap and detected by laser-induced fluorescence. The mass (M) and charge (Q) were determined nondestructively, and both were followed continuously over the course of hours or days. Emission spectra of the trapped QDs are significantly red-shifted relative to the solution-phase emission from the same particles. The temperature of the trapped QDs is determined by the balance between laser heating and collisional cooling and thermal emission, and it is possible to heat the particles to remove ligands or to the point of sublimation. QDs are observed to be emissive during sublimation, for up to 85% mass loss, with emission intensity roughly proportional to the surface area. Eventually, the fluorescence quantum yield drops suddenly, and the QDs begin to blink. The method used is versatile and will allow studies of quantum dot optical properties as a function of size, ligand removal, heating, surface oxidation, and other manipulations, where these properties are continuously correlated with the mass and charge." @default.
• W2326370906 created "2016-06-24" @default.
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• W2326370906 date "2014-01-14" @default.
• W2326370906 modified "2023-09-27" @default.
• W2326370906 title "Single CdSe/ZnS Nanocrystals in an Ion Trap: Charge and Mass Determination and Photophysics Evolution with Changing Mass, Charge, and Temperature" @default.
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• W2326370906 doi "https://doi.org/10.1021/nn405920k" @default.
• W2326370906 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24410129" @default.
• W2326370906 hasPublicationYear "2014" @default.
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