Non-enzymatic amperometric sensor of catechol and hydroquinone using Pt-Au-organosilica@chitosan composites modified electrode

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• 作者：Dehua Yuan  ; [Author Vitae] ; Shihong Chen ; ^{cshong@swu.edu.cn}  ; [Author Vitae] ; Fangxin Hu  ; [Author Vitae] ; Chengyan Wang  ; [Author Vitae] ; Ruo Yuan ; ^{yuanruo@swu.edu.cn}  ; [Author Vitae]
• 关键词：Pt-Au-organosilica@chitosan ; Composites ; Sensor ; Catechol ; Hydroquinone
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：20 June, 2012
• 卷：168
• 期：Complete
• 页码：193-199
• 文件大小：986 K

摘要

An amperometric non-enzymatic sensor based on Pt-Au-organosilica@chitosan (Pt-Au-OSi@CS) composites has been developed for determining catechol (CC, 1,2-dihydroxybenzene) and hydroquinone (HQ, 1,4-dihydroxybenzene). The Pt-Au-OSi@CS composites were synthesized using positively charged inorganic-organic core-shell organosilica@chitosan (OSi@CS) crosslinked nanospheres as templates for the assembly of negatively charged 1-3 nm Au nanoparticles seeds which acted in subsequent step as nucleation sites for the reduction of platinum. Due to the excellent electrocatalytic response of Pt-Au-OSi@CS for the reduction of CC and HQ, the sensor based on the Pt-Au-OSi@CS exhibited broad linear range of 0.06-90.98 渭M for CC and 0.03-172.98 渭M for HQ. The low detection limits of 0.02 and 0.01 渭M (S/N = 3) were obtained for CC and HQ, respectively. The operational conditions were optimized. The sensitivities of the non-enzyme electrode for CC and HQ were 307.95 渭A mM^鈭? cm^鈭? and 1714.20 渭A mM^鈭? cm^鈭?, respectively.