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Colloidal CdS/SiO 2 Nanocomposite Particles from Charged Colloids of CdS and Silica
Author(s) -
Roskamp Meike,
Schaper Andreas K.,
Wendorff Joachim H.,
Schlecht Sabine
Publication year - 2007
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200601154
Subject(s) - chemistry , colloid , nanocomposite , ligand (biochemistry) , electrophoresis , nanoparticle , colloidal silica , scanning electron microscope , chemical engineering , inorganic chemistry , analytical chemistry (journal) , chromatography , organic chemistry , materials science , composite material , biochemistry , receptor , engineering , coating
Colloidal CdS/SiO 2 nanocomposite particles were prepared from soluble negatively charged silica particles ( d = 150 nm) and positively charged ligand‐stabilised CdS particles ( d = 3 nm). The positively charged ligand shell of the CdS particles is constituted of thiocholine [TC, trimethyl(2‐sulfanylethyl)azanium chloride]. As a quaternary nitrogen atom carries the charge in this ligand, the positive charge on the particles is basically independent of the pH value of the solution. A neutral pH value was chosen for the deposition of the CdS particles on the larger silica particles which already contain a significant negative charge under these conditions. The obtained nanocomposite particles were characterised by optical spectroscopy, gel electrophoresis and electron microscopy.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)