Label-Free in Situ Optical Monitoring of the Adsorption of Oppositely Charged Metal Nanoparticles

被引：11

作者：

Peter, Beatrix ^{[1
,2
]}

Kurunczi, Sandor ^{[2
]}

Patko, Daniel ^{[1
,2
]}

Lagzi, Istvan ^{[3
]}

Kowalczyk, Bartlomiej ^{[4
]}

Racz, Zoltan ^{[5
]}

Grzybowski, Bartosz A. ^{[4
]}

Horvath, Robert ^{[2
]}

机构：

[1] Univ Pannonia, Doctoral Sch Mol & Nanotechnol, H-8201 Veszprem, Hungary

[2] Inst Tech Phys & Mat Sci, Res Ctr Nat Sci, Nanobiosensor Grp, H-1121 Budapest, Hungary

[3] Budapest Univ Technol & Econ, Dept Phys, H-1111 Budapest, Hungary

[4] Northwestern Univ, Dept Chem & Chem & Biol Engn, Evanston, IL 60208 USA

[5] Eotvos Lorand Univ, Hungarian Acad Sci, Res Grp Theoret Phys, H-1053 Budapest, Hungary

来源：

LANGMUIR | 2014年 / 30卷 / 44期

基金：

匈牙利科学研究基金会;

关键词：

GUIDE LIGHTMODE SPECTROSCOPY; COOPERATIVE ADSORPTION; MULTILAYER FILMS; THIN-FILMS; LAYER;

D O I：

10.1021/la5029405

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The mechanism of alternating deposition of oppositely charged gold nanoparticles (AuNPs) was investigated by optical waveguide lightmode spectroscopy (OWLS). OWLS allows monitoring of the kinetics of layer-by-layer (LbL) adsorption of positively and negatively charged nanoparticles in real time without using any labels so that the dynamics of layer formation can be revealed. Positively charged NPs that are already deposited on a negatively charged glass substrate strongly facilitate the adsorption of the negatively charged particles. The morphology of the adsorbed layer was also investigated with atomic force microscopy (AFM). AFM revealed that the interaction between oppositely charged particles results in the formation of NP clusters with sizes varying between 100 and 6000 NPs. The cluster size distribution is found to be an exponentially decaying function, and we propose a simple theory to explain this finding.

引用

页码：13478 / 13482

页数：5