Abstract
We describe herein a synthetic technology for precise size control of monodispersed hybridgold nanoparticles, which combines seeding growth and digestive ripening. Inthis procedure, alkyl amines allow the solubilization and thermal reduction ofHAuCl4 while 2.1 nm gold nanoparticles capped by thiol functions are used as seeds. By carefully controllingthe HAuCl4/seeds ratio, highly monodisperse gold nanoparticles with various sizes (from 2.1 to 8.8 nm) can begenerated. Variation of the alkyl amines as well as optimization of the growth procedureallows the precise tuning of particle size within a 0.5 nm range. On the basis ofXPS and TEM studies, a mechanism for nanoparticle formation is proposed.
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