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Size‐Selective Separation and Purification of “Water‐Soluble” Organically Capped Brightly Photoluminescent Silicon Nanocrystals
Author(s) -
Chen Kenneth K.,
Mastronardi Melanie L.,
Kübel Christian,
Ozin Geoffrey A.
Publication year - 2015
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201400185
Subject(s) - photoluminescence , dispersity , nanocrystal , water soluble , chemistry , quantum yield , precipitation , solubility , quantum dot , chemical engineering , nanotechnology , materials science , fluorescence , organic chemistry , optoelectronics , physics , meteorology , engineering , quantum mechanics
Polydispersity and water solubility of as‐synthesized silicon nanocrystals (ncSi) present two significant challenges in the elucidation of size‐dependent physical, chemical, and biological properties. Polydispersions of water‐soluble, colloidally stable, brightly photoluminescent ncSi are purified and size‐separated into monodisperse fractions using size‐selective precipitation and density gradient ultracentrifugation methods. Size‐dependent trends in the photoluminescence and absolute photoluminescence quantum yield of ncSi are investigated.