Bimetallic PtM (M=Pd, Ir) nanoparticle decorated multi-walled carbon nanotube enzyme-free, mediator-less amperometric sensor for H 2O 2

Kuan Jung Chen, K. Chandrasekara Pillai, John Rick, Chun Jern Pan, Shih Han Wang, Chung Chiun Liu, Bing Joe Hwang

研究成果: 雜誌貢獻期刊論文同行評審

156 引文 斯高帕斯(Scopus)

摘要

A new highly catalytic and intensely sensitive amperometric sensor based on PtM (where M=Pd, Ir) bimetallic nanoparticles (NPs) for the rapid and accurate estimation of hydrogen peroxide (H 2O 2) by electrooxidation in physiological conditions is reported. PtPd and PtIr NPs-decorated multiwalled carbon nanotube nanocatalysts (PtM/MWCNTs) were prepared by a modified Watanabe method, and were characterized by XRD, TEM, ICP, and XAS. The sensors were constructed by immobilizing PtM/MWCNTs nanocatalysts in a Nafion film on a glassy carbon electrode. Both PtPd/MWCNTs and PtIr/MWCNTs assemblies catalyzed the electrochemical oxidation of H 2O 2. Cyclic voltammetry characterization measurements revealed that both the PtM (M=Pd, Ir)/MWCNTs/GCE possessed similar electrochemical surface areas (∼0.55cm 2), and electron transfer rate constants (∼1.23×10 -3cms -1); however, the PtPd sensor showed a better performance in H 2O 2 sensing than did the PtIr counterpart. Explanations were sought from XAS measurements to explain the reasons for differences in sensor activity. When applied to the electrochemical detection of H 2O 2, the PtPd/MWCNTs/GC electrode exhibited a low detection limit of 1.2μM with a wide linear range of 2.5-125μM (R 2=0.9996). A low working potential (0V (SCE)), fast amperometric response (<5s), and high sensitivity (414.8μAmM -1cm -2) were achieved at the PtPd/MWCNTs/GC electrode. In addition, the PtPd/MWCNTs nanocatalyst sensor electrode also exhibited excellent reproducibility and stability. Along with these attractive features, the sensor electrode also displayed very high specificity to H 2O 2 with complete elimination of interference from UA, AA, AAP and glucose.

原文???core.languages.en_GB???
頁(從 - 到)120-127
頁數8
期刊Biosensors and Bioelectronics
33
發行號1
DOIs
出版狀態已出版 - 15 3月 2012

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