TiO2 nanotube arrays fabricated by anodization in different electrolytes for biosensing
TiO2 nanotube arrays fabricated by anodization in different electrolytes for biosensing
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DOI：
10.1016/j.elecom.2007.07.020
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发表时间：
2007-09
影响因子：
5.4
通讯作者：
P. Xiao;Betzaida Batalla Garcia;Qing Guo;Dawei Liu;G. Cao
中科院分区：
文献类型：
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作者：
P. Xiao;Betzaida Batalla Garcia;Qing Guo;Dawei Liu;G. Cao
采用阳极氧化法在不同电解液中制备了二氧化钛纳米管阵列。利用XRD、SEM和EDX等分析手段对纳米管阵列的形貌、结晶度和组成进行了表征。电化学阻抗谱（EIS）研究了它们的电导率和电容。采用循环伏安法和恒电流法研究了二氧化钛纳米管阵列与辣根过氧化物酶（HRP）和氯化噻吩（Th）的共吸附对过氧化氢的敏感性。实验结果表明，不同的TiO 2纳米管阵列对H2 O2的灵敏度存在明显的差异，这是由于它们的电导率不同。进一步的实验表明，TiO 2纳米管对HRP和Th的吸附能力存在明显差异，当HRP浓度最高时，其灵敏度最高。在氟化钾溶液中制备的TiO 2纳米管阵列对过氧化氢的灵敏度在10−5-3×10− 3 M范围内、pH 6.7、电位为− 600 mV（vs. Ag/AgCl）时表现出最好的灵敏度。
Titania nanotube arrays were fabricated by anodic oxidation of titanium foil in different electrolytes. The morphology, crystallinity and composition of the as-prepared nanotube arrays were studied by XRD, SEM and EDX. Electrochemical impedance spectroscopy (EIS) was employed to investigate their electrical conductivity and capacitance. Titania nanotube arrays co-adsorbed with horseradish peroxidase (HRP) and thionine chloride (Th) were studied for their sensitivity to hydrogen peroxide by means of cyclic voltammetric and galvanostatic measurements. The experiments showed that TiO2nanotube arrays possessed appreciably different sensitivities to H2O2due to their different conductivity. Further experiments revealed that TiO2nanotubes have noticeably different ability of adsorbing HRP and Th, and the best sensitivity was achieved when the density of HRP is the highest. The TiO2nanotube arrays fabricated in potassium fluoride solution demonstrated the best sensitivity on hydrogen peroxide in the range of 10−5–3×10−3M at pH 6.7 and at a potential of −600mV (vs. Ag/AgCl).