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Electrocatalytic Oxidation of Saccharides at MoOx/AuNPs Modified Electrode Towards Analytical Application (cited: 1)
Shou-guo Wu*,Zhi-xin Zhang,Qi-ping Zhao,Lei Zhou,Yao Yao
Author NameAffiliationE-mail
Shou-guo Wu* Department of Chemistry, University of Science and Technology of China, Hefei 230026, China sgwu@ustc.edu.cn 
Zhi-xin Zhang Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Qi-ping Zhao Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Lei Zhou Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Yao Yao Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Abstract:
The MoOx/AuNPs composite film modified glassy carbon electrode was fabricated by electro-depositing simultaneously gold nanoparticles and molybdenum oxides using cyclic voltammetry. The morphology and topography of the MoOx/AuNPs composite were char-acterized by scan electron microscopy and X-ray photoelectron spectroscopy respectively, and the electrocatalytic oxidation of glucose at the MoOx/AuNPs composite film was inves-tigated and analyzed in detail. It was shown that the MoOx/AuNPs composite was of strong electrocatalytic activity towards oxidation of glucose as well as other saccharides, so that an attempt was made for direct voltammetric determination of glucose. Then the positive scan polarization reverse catalytic voltammetry was proposed for the first time. Based on this method, the pure oxidation current was extracted by subtraction of the blank current in the reverse scan. The current sensitivity was enhanced tremendously and the signal to noise ra-tio was improved adequately. The electrocatalytic oxidation of glucose at the MoOx/AuNPs modified electrode was performed in alkaline medium, a wide linear range from 0.01 mmol/L to 4.0 mmol/L of glucose, a higher current sensitivity of 2.35 mA/(mmol/L·cm2), and a lower limit of detection of 9.01 μmol/L (at signal/noise=3) were achieved. In addition, the electrocatalytic oxidation of other saccharides such as lactose, fructose and sucrose was also evaluated.
Key words:  Molybdenum oxide, Gold nanoparticle, Non-enzymatic biosensor, Positive scan polarization reverse catalytic voltammetry
FundProject:
金纳米粒子和钼氧化物复合膜修饰电极的制备及应用 (cited: 1)
吴守国*,张志鑫,赵祺平,周磊,姚瑶
摘要:
利用循环伏安法将金纳米粒子和钼氧化物共同电沉积在玻碳电极表面,制备了金纳米粒子和钼氧化物复合膜修饰电极,利用SEM和XPS研究了MoOx/AuNPs复合膜的表面形态,并研究其修饰电极对葡萄糖的电催化氧化过程. 首次提出了阳极扫描极化反向催化伏安法,即在反向扫描过程中纯的催化氧化电流通过扣减背景电流的方法被提取出来. 显著提高电流测量灵敏度改善了信噪比. 制备的MoOx/AuNPs复合膜修饰电极在0.01~4.0 mmol/L对葡萄糖具有线性响应,电流灵敏度为2.35 mA·L/(mmol·cm2),检测限为9.01 μmol/L(信噪比为3).
关键词:  钼氧化物,金纳米粒子,非酶传感器,阳极扫描极化反向催化伏安法
DOI:10.1063/1674-0068/27/05/600-606
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