Hyflon
AD 60 and dodecafluoroheptylpropyl-trihydroxysilane are
employed as ligands to synthesize water-stable core–shell CsPbBr3/Cs4PbBr6 nanocrystals in aqueous dispersion,
with a high photoluminescence quantum yield of 73% and a long luminescence
lifetime of 207 ns. The obtained CsPbBr3/Cs4PbBr6 NCs passivated by fluorinated ligands are well dispersed
in water with a mean diameter of 21.9 nm. The whole synthesis can
be performed at room temperature on air; fluorinated chains of the
Hyflon ligand strongly bond on the surface of CsPbBr3/Cs4PbBr6 nanocrystals and further link amphiphilic
fluorinated silanol molecules through hydrophobic interactions. CsPbBr3/Cs4PbBr6 nanocrystals are stable in
the aqueous phase for at least 1 month, maintaining strong photoluminescence
(68% of initial intensity after 31 days) because of surface passivation.
They are used as a luminescent temperature probe in water with a sensitivity
of its intensity equal to 1.01% K–1 and good thermal
stability for 10 heating–cooling cycles between 278 and 328
K.
In this work, we demonstrate an inexpensive method of prototyping microfluidics using a desktop injection molding machine. A centrifugal microfluidic device with a novel central filling mechanism was developed to...
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