Sensing of H2O2 at low surface density assemblies of pt nanoparticles in polyelectrolyte

被引：106

作者：

Karam, Pierre ^{[1
]}

Halaoui, Lara I. ^{[1
]}

机构：

[1] Amer Univ Beirut, Dept Chem, Beirut 110236, Lebanon

来源：

ANALYTICAL CHEMISTRY | 2008年 / 80卷 / 14期

关键词：

D O I：

10.1021/ac702358d

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Amperometric detection of H2O2 was studied at random arrays of 2.5 nm polyacrylate-capped Pt nanoparticles (NP) assembled in poly(diallydimethylammonium chloride), PDDA, as a function of NP surface coverage. The arrays were assembled by varying the adsorption time of PDDA-modified electrodes in the nanoparticles solution. Pt NP-on-PDDA assemblies exhibited significant sensitivity and stability facing constant anodic polarization and a low limit of detection at small Pt mass in submonolayer coverage. The current output was measured at approximately 0.5 A M-1 cm(geom)(-2) over a linear range from 42 nM to 0.16 mM H2O2 at a loading of 0.87 mu g(Pt)/cm(2) or an estimated coverage of 0.4 of an assumed monolayer, or higher, and decreased with decreasing NP surface density to 0.2 A M-1 cm(geom)(-2) at a Pt loading of 190 ng/cm(2.)

引用

页码：5441 / 5448

页数：8

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