Novel snowflake-like Pt-Pd bimetallic clusters on screen-printed gold nanofilm electrode for H₂O₂ and glucose sensing

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• 作者：Xiangheng Niu^a ; Chen Chen^a ; Hongli Zhao^a ; ^{honglizhao@ecust.edu.cn} ; Yan Chai^a ; Minbo Lan^a ; ^b ; ^{minbolan@ecust.edu.cn}
• 关键词：Snowflake-like Pt&ndash ; Pd nanoclusters ; H2O2 ; Glucose oxidase ; Glucose
• 刊名：Biosensors and Bioelectronics
• 出版年：2012
• 期刊代码：12_09565663
• 类别：ch
• 出版时间：June-July, 2012
• 卷：36
• 期：1
• 页码：262-266
• 文件大小：703 K

摘要

Novel snowflake-like Pt-Pd bimetallic nanoclusters (Pt-PdBNC) were synthesized on a screen-printed gold nanofilm electrode (SPGFE) substrate by electrochemically reducing precursors with a new constant potential/multi-potential step deposition strategy. The electrocatalytic behavior of the modified electrode (SPGFE/Pt-PdBNC) towards H₂O₂ was investigated. The results indicate that the as-prepared Pt-PdBNC significantly enhances the electrochemical reduction of H₂O₂ in neutral media, exhibiting preferable electrocatalytic performance compared to Pt and Pd monometallic nanoclusters. Under optimum conditions, SPGFE/Pt-PdBNC offers linear responses for H₂O₂ in the concentration range from 0.005 to 6 mM with an ultrahigh sensitivity of 804 mA M^鈭? cm^鈭? and excellent selectivity. Furthermore, glucose oxidase was immobilized on the Pt-PdBNC structure, and the fabricated biosensor presents favorable properties for glucose sensing.