title: Precise size control of hydrophobic gold nanoparticles using cooperative effect of refluxing ripening and seeding growth.
abstract: We describe herein a synthetic technology for precise size control of monodispersed hybrid gold nanoparticles, which combines seeding growth and digestive ripening. In this procedure, alkyl amines allow the solubilization and thermal reduction of HAuCl(4) while 2.1 nm gold nanoparticles capped by thiol functions are used as seeds. By carefully controlling the HAuCl(4)/seeds ratio, highly monodisperse gold nanoparticles with various sizes (from 2.1 to 8.8 nm) can be generated. Variation of the alkyl amines as well as optimization of the growth procedure allows the precise tuning of particle size within a 0.5 nm range. On the basis of XPS and TEM studies, a mechanism for nanoparticle formation is proposed.
authors.affiliation: Key Laboratory of Colloid and Interface Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100086, People's Republic of China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Yang
authors.forename: Ya
authors.initials: Y
authors.lastname: Yan
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Jinru
authors.initials: J
authors.lastname: Li