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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Electrochemical performance and biosensor application of TiO2 nanotube arrays with mesoporous structures constructed by chemical etching
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Electrochemical performance and biosensor application of TiO2 nanotube arrays with mesoporous structures constructed by chemical etching

机译：化学刻蚀结构介孔TiO2纳米管阵列的电化学性能及生物传感器应用

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摘要

Novel mesoporous TiO2 nanotube arrays (TiO2 NTAs) were synthesized by an anodization method combined with chemical etching in HF solution, and the electrochemical performance was studied. Glucose oxidase (GOx) was immobilized on the mesoporous TiO2 NTAs to achieve an efficient biosensor for amperometric detection of glucose. The morphology, structure, component and electrochemical performance of mesoporous TiO2 NTAs were characterized by scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffractometry, X-ray photoelectron spectrometry and an electrochemical workstation, respectively. The influence of the mesoporous structure on the electrochemical performance is discussed in detail by comparing the cyclic voltammograms and electrochemical impedance spectrum of TiO2 and mesoporous TiO2 NTAs in different conditions. High electrochemical active surface area and electron transfer rate play key roles in enhancing the electrochemical performance of mesoporous TiO2 NTAs. When used as the basis of a biosensor, the amperometric response of glucose on a GOx/TiO2-0.5 NTAs electrode is linearly proportion to the glucose concentration in the range from 0.1 to 6 mM with a sensitivity of 0.954 mu A mM(-1) cm(-2), which is 14.3 times that of un-etched GOx/TiO2 NTAs.
机译：结合阳极溶液的阳极氧化和阳极氧化方法，合成了新型介孔TiO2纳米管阵列（TiO2 NTAs），并研究了其电化学性能。将葡萄糖氧化酶（GOx）固定在介孔TiO2 NTA上，以实现用于安培检测葡萄糖的高效生物传感器。分别用扫描电子显微镜，高分辨率透射电子显微镜，X射线衍射法，X射线光电子能谱和电化学工作站对介孔TiO2 NTA的形貌，结构，组分和电化学性能进行了表征。通过比较不同条件下TiO2和介孔TiO2 NTA的循环伏安图和电化学阻抗谱，详细讨论了介孔结构对电化学性能的影响。高电化学活性表面积和电子转移速率在增强介孔TiO2 NTAs的电化学性能中起关键作用。当用作生物传感器的基础时，GOx / TiO2-0.5 NTAs电极上的葡萄糖的安培响应与葡萄糖浓度在0.1至6 mM范围内成线性比例，灵敏度为0.954μAmM（-1） cm（-2），是未蚀刻的GOx / TiO2 NTA的14.3倍。

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