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Effect of Tertiary and Secondary Phosphines on Low-Temperature Formation of Quantum Dots

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  • We thank Dr. Hong Cao for some of the in situ absorption measurements presented, Kenneth Chan for the MALDI measurement, Dr. Dennis Whitfield and Dr. Keith Ingold for useful discussions, Donald Van Loon and Vivier Lefebvre for financial support, and the Defence Research and Development Canada Centre for Security Science Chemical, Biological, Radiological/Nuclear, and Explosives Research and Technology Initiative (CRTI 09-0511RD “Next-generation stand-off radiation detection using nanosensors”) for financial support.

Abstract

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Getting to the TOP of things: The coordination of tri-n-octylphosphine (TOP) instead of diphenylphosphine (DPP) to cadmium oleate (Cd(OA)2) reveals how tertiary and secondary phosphines enhance the yield and reproducibility of the synthesis of nanocrystals by shifting the equilibrium of the reaction to the right (see picture). High Cd-to-Se and Se-to-TOP feed molar ratios facilitate the formation of Se[DOUBLE BOND]DPP by way of Se exchange from TOP to DPP.

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