Noninjection Facile Synthesis
of Gram-Scale Highly
Luminescent CdSe Multipod Nanocrystals
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Abstract
Nearly all reported approaches for synthesis of high
quality CdSe
nanocrystals (NCs) involved two steps of preparation of Cd or Se stock
solution in advance and then mixing the two reactants via hot-injection
in high temperature. In this manuscript, Gram-scale CdSe multipod
NCs were facilely synthesized in a noninjection route with the use
of CdO and Se powder directly as reactants in paraffin reaction medium
containing small amount of oleic acid and trioctylphosphine. The influence
of various experimental variables, including reaction temperature,
nature and amount of surfactants, Cd-to-Se ratio, and the nature of
reactants, on the morphology of the obtained CdSe NCs have been systematically
investigated. After deposition of ZnS shell around the CdSe multipod
NCs, the PL QY of the obtained CdSe/ZnS can be up to 85%. The reported
noninjection preparation approach can satisfy the requirement of industrial
production bearing the advantage of low-cost, reproducible, and scalable.
Furthermore, this facile noninjection strategy provides a versatile
route to large-scale preparation of other semiconductor NCs with multipod
or other morphologies