Water-Soluble, Carboxyl-Modified Silicon Nanoparticles

摘要

A practical surface modification of Si nanoparticles was prepared by ultrasound-induced solution synthesis. This speedy rout produces the silicon nanoparticles in the size range from 2 nm to 5 nm and the surface of Si nanoparticles are carboxylated by a simple and timesaving rout. The carboxyl functional groups were directly attached at the nanoparticle surface with covalent bonds between C atoms of organic and Si atoms of the nanoparticle. This organic layer with polar terminated groups keeps Si nanoparticles to stably disperse in aqueous solutions. The carboxyl group of nanoparticles was characterized by FT-IR spectroscopy. The HRTEM images show that the carboxyl-modified Si nanoparticles have spherical shape, predominantly with diameters in the range of 2-4 nm. The emission maximum of PL spectrum for samples exhibited at 475 nm and the FWHM was approximately 130 nm.