pH-dependent aggregation of citrate-capped Au nanoparticles induced by Cu2+ ions: The competition effect of hydroxyl groups with the carboxyl groups

被引：39

作者：

Jiang, Lin ^{[1
]}

Guan, Jian ^{[1
]}

Zhao, Lili ^{[1
]}

Li, Jun ^{[1
]}

Yang, Wensheng ^{[1
]}

机构：

[1] Jilin Univ, Coll Chem, Key Lab Surface & Interface Chem Jilin Prov, Changchun 130012, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2009年 / 346卷 / 1-3期

基金：

中国国家自然科学基金;

关键词：

Au nanoparticles; Metal ions; Coordination; Citrate; Aggregation; FUNCTIONALIZED GOLD NANOPARTICLES; METAL NANOPARTICLES; AQUEOUS-MEDIA; CHEMISTRY; DNA; NANOTECHNOLOGY; SURFACE; FILMS;

D O I：

10.1016/j.colsurfa.2009.06.023

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The citrate-capped Au nanoparticles were found to undergo pH-dependent aggregation induced by Cu2+ ions. At low pH value (8.9), the Au nanoparticles aggregated into fractal-like structure induced by the coordination interactions between the carboxyl groups of citrate ligands and Cu2+ ions. At high pH value (10.1), the Au nanoparticles aggregated into close-packed structure attributed to the increased concentration of hydroxyl groups. The coordination interactions between the metal ions and the ligands were suppressed as a result of the competition effect of the hydroxyl groups with the carboxyl groups. The aggregation process was identified to be dominated by the cluster-cluster mechanism at the low pH value and the particle-cluster mechanism at the high pH value. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：216 / 220

页数：5

共 25 条

[1] Controlled and reversible aggregation of biotinylated gold nanoparticles with streptavidin [J].