Simultaneous Determination of Small Biomolecules and Nitrite Using an Au/TiO2/Carbon Nanotube Composite-Modified Electrode
Simultaneous Determination of Small Biomolecules and Nitrite Using an Au/TiO2/Carbon Nanotube Composite-Modified Electrode
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DOI：
10.1149/2.0361613jes
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发表时间：
2016
影响因子：
3.9
通讯作者：
Luping Sun;Hongji Li;Mingji Li;Ping Li;Cuiping Li;Bao-he Yang
中科院分区：
文献类型：
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作者：
Luping Sun;Hongji Li;Mingji Li;Ping Li;Cuiping Li;Bao-he Yang
采用Au纳米粒子/TiO 2纳米粒子/碳纳米管（Au/TiO 2/CNT）复合修饰玻碳电极（GCE），建立了同时测定抗坏血酸（AA）、多巴胺（DA）、尿酸（UA）、色氨酸（Trp）和亚硝酸根的高选择性电化学传感器。由于Au/TiO 2/CNT纳米复合材料具有良好的电催化活性、大的比表面积和丰富的活性中心，因此被用作敏感层。Au/TiO 2/CNT纳米复合材料具有良好的选择性和灵敏度，可用于AA、DA、UA、Trp和亚硝酸根的测定。Au/TiO 2/CNT/GCE对AA、DA、UA、Trp和亚硝酸根的线性响应范围分别为3 - 281、0.3 - 15、1 - 162、1 - 162和4 - 225 μM。检出限分别为1、0.2、0.6、0.8和3 μM。此外，通过这些纳米复合材料可以制备用于同时测定这五种物质的柔性传感纸。
A highly selective electrochemical sensor was developed for the simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA), tryptophan (Trp) and nitrite using a glassy carbon electrode (GCE) modified with an Au nanoparticle/TiO 2 nanoparticle/carbon nanotube (Au/TiO 2/CNT) composite. The Au/TiO 2/CNT nanocomposite as a sensitive layer was used because it offers great electrocatalytic activity, large surface area, and abundant active sites. The Au/TiO 2/CNT nanocomposite has good selectivity and remarkable sensitivity and could determine AA, DA, UA, Trp and nitrite. The Au/TiO 2/CNT/GCE had linear response ranges for detecting AA, DA, UA, Trp and nitrite of 3− 281, 0.3− 15, 1− 162, 1− 162 and 4− 225 μM, respectively. The detection limits were 1, 0.2, 0.6, 0.8 and 3 μM, respectively. In addition, a flexible sensing paper can be prepared via these nanocomposites for the simultaneous determination of these five species.