Au Nanoparticles Decorated TiO2 Nanotube Arrays as a Recyclable Sensor for Photoenhanced Electrochemical Detection of Bisphenol A
Au Nanoparticles Decorated TiO2 Nanotube Arrays as a Recyclable Sensor for Photoenhanced Electrochemical Detection of Bisphenol A
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DOI：
10.1021/acs.est.5b05857
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发表时间：
2016-04-19
影响因子：
11.4
通讯作者：
Yang, Mengsu
中科院分区：
文献类型：
--
作者：
Hu, Liangsheng;Fong, Chi-Chun;Yang, Mengsu
基于Au纳米颗粒修饰的碳掺杂TiO 2纳米管阵列（TiO 2/Au NTA），建立了一种可光刷新的光增强双酚A（BPA）电化学传感平台。通过在氩气中快速退火阳极氧化的纳米管，然后通过可控电沉积Au NPs制备TiO 2/Au NTA。Au NPs的修饰不仅改善了杂化NTA的光电化学行为，而且提高了杂化NTA的电催化活性。同时，NTA的高光催化活性允许电极在短时间UV处理后容易更新而不破坏微观结构和表面状态。在紫外光照射下，TiO 2/Au NTAs电极能持续提供新鲜的反应表面，BPA消耗空穴，提高了光生电子-空穴对的分离效率，进一步提高了光生电流，从而显著改善了BPA在该电极上的电化学检测。结果表明，可更新的TiO 2/Au NTAs电极是一种很有前途的传感器，可用于长期监测BPA，检测限（S/N = 3）为6.2 nM，灵敏度为2.8 μ A.mu M-1.cm（2）。
A photorefreshable and photo enhanced electrochemical sensing platform for bisphenol A (BPA) detection based on Au nanoparticles (NPs) decorated carbon doped TiO2 nanotube arrays (TiO2/Au NTAs) is described. The TiO2/Au NTAs were prepared by quick annealing of anodized nanotubes in argon, followed by controllable electrodeposition of Au NPs. The decoration of Au NPs not only improved photoelectrochemical behavior but also enhanced electrocatalytic activities of the resulted hybrid NTAs. Meanwhile, the high photocatalytic activity of the NTAs allowed the electrode to be readily renewed without damaging the microstructures and surface states after a short UV treatment. The electrochemical detection of BPA on TiO2/Au NTAs electrode was significantly improved under UV irradiation as the electrode could provide fresh reaction surface continuously and the further increased photocurrent resulting from the improved separation efficiency of the photogenerated electron-hole pairs derived from the consumption of holes by BPA. The results showed that the refreshable TiO2/Au NTAs electrode is a promising sensor for long-term BPA monitoring with the detection limit (S/N = 3) of 6.2 nM and the sensitivity of 2.8 mu A.mu M-1.cm(2).