Process for preparation of surface modified silicon nanoparticles

摘要

Preparing surface-modified silicon particles, where the surface modification completely envelops the surface of the silicon particles and consists of moieties (Q), comprises: (a) treating silicon particles completely or partially enveloped with a silicon dioxide layer, in a nonoxidizing medium with 5 vol.% hydrogen fluoride/ethanol solution for 10 minutes, and subsequently removing the liquid phase by distillation the obtained silicon particles freed from silicon dioxide; and (b) reacting the obtained mixture with an alkene compound (III) or an alkylene compound (IV). Preparing surface-modified silicon particles with an average particle diameter of 1-20 nm, where the surface modification completely envelops the surface of the silicon particles and consists of one or more moieties (Q) containing an alkane compound of formula (-C1HR-C2HR-(C(R) 2) n-X) (I) or an alkene compound of formula (-C1H=CH-(C(R) 2) n-X) (II), which are bonded covalently to the silicon via a silicon-carbon bond, comprises: (a) treating silicon particles completely or partially enveloped with a silicon dioxide layer, in a nonoxidizing medium with 5 vol.% hydrogen fluoride/ethanol solution for 10 minutes, and subsequently removing the liquid phase by distillation the obtained silicon particles freed from silicon dioxide; and (b) reacting the obtained mixture with an alkene compound of formula (CHR=CR-(C(R) 2) n-X) (III) or an alkylene compound of formula (CHC-(C(R) 2) n-X) (IV). C1 : carbon atom which forms the covalent silicon-carbon bond; X : a molecule residue having a delocalized pi-electron system; R : CH 3, C 2H 5, n-C 3H 7, iso-C 3H 7, n-C 4H 9 or iso-C 4H 9; and n : 0-9. An independent claim is included for a dispersion comprising the surface-modified silicon particles.