Silver-Polymer Composite Stars: Synthesis and Applications

被引：44

作者：

Homan, Kimberly A. ^{[1
]}

Chen, Jeffrey ^{[1
]}

Schiano, Adriane ^{[1
]}

Mohamed, Mona ^{[2
]}

Willets, Katherine A. ^{[3
]}

Murugesan, Sankaran ^{[3
]}

Stevenson, Keith J. ^{[3
]}

Emelianov, Stanislav ^{[1
]}

机构：

[1] Univ Texas Austin, Dept Biomed Engn, Austin, TX 78712 USA

[2] Cairo Univ, Natl Inst Laser Enhanced Sci, Environm Applicat Dept, Cairo, Egypt

[3] Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2011年 / 21卷 / 09期

基金：

美国国家科学基金会;

关键词：

SHAPE-CONTROLLED SYNTHESIS; SINGLE-MOLECULE; METAL NANOPARTICLES; PLGA NANOPARTICLES; RAMAN-SCATTERING; NANOCRYSTALS; OXYGEN; GOLD; AG/C; ELECTROREDUCTION;

D O I：

10.1002/adfm.201001556

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal "silver stars" were synthesized upon poly(lactic-co-glycolic) acid nanosphere templates via a facile two-step silver reduction method. Myriad dendrimer-like Ag star morphologies were synthesized by varying the amount of poly(vinyl alcohol) and trisodium citrate used during silver reduction. Scanning electron microscopy studies revealed that star-shaped silver-polymer composites possessing nanoscopic, fractal morphologies with diameters ranging from 500 nm to 7 mu m were produced. These composites have broad applications from antibacterial agents to catalysis; two such applications were tested here. Surface-enhanced Raman spectroscopy (SERS) studies showed multiple hot spots of SERS activity within a single star. Electrochemical catalysis experiments demonstrated the feasibility of using the silver stars instead of platinum for the oxygen reduction reaction in alkaline fuel cells.

引用

页码：1673 / 1680

页数：8

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