Yan Bingdong, Zhao Xiaoru, Chen Delun, Cao Yang, Lv Chuanzhu, Tu Jinchun, Wang Xiaohong, Wu Qiang
State Key Laboratory of Marine Resource Utilization in the South China Sea, School of Materials Science and Engineering, Hainan University Haikou 570228 P. R. China
Research Unit of Island Emergency Medicine, Chinese Academy of Medical Sciences (No. 2019RU013), Hainan Medical University Haikou 571199 P. R. China.
RSC Adv. 2020 Dec 10;10(72):43985-43993. doi: 10.1039/d0ra06890j. eCollection 2020 Dec 9.
A new photoelectrochemical (PEC) sensing platform comprising TiO nanotube arrays (TiONTAs), polyaniline (PANI), and gold nanoparticles (AuNPs) was successfully fabricated. After loading the enzyme, this Au-PANI-TiONTA electrode showed excellent response to glucose at a linear range of 2-36 mM with a 0.02 mM detection limit. Good PEC performance was obtained due to the following advantages of the material: high visible-light harvesting ability for excellent light trapping capacity of PANI and AuNPs, good separation of the photo-induced charges related to the specific Au-PANI-TiONTA heterostructure, efficient electrode surface reaction kinetics derived from the large specific surface area of TiONTAs and improved electrode catalytic activity. This work proposed a new and general PEC enzymatic format and can be extended to prepare different PEC biosensors for biomolecules such as DNA, proteins and substrates of oxidases.
成功构建了一种新型的光电化学（PEC）传感平台，该平台由TiO纳米管阵列（TiONTAs）、聚苯胺（PANI）和金纳米颗粒（AuNPs）组成。负载酶后，这种Au-PANI-TiONTA电极在2-36 mM的线性范围内对葡萄糖表现出优异的响应，检测限为0.02 mM。由于该材料具有以下优点，因此获得了良好的PEC性能：聚苯胺和金纳米颗粒具有出色的光捕获能力，对可见光的捕获能力强；特定的Au-PANI-TiONTA异质结构使光生电荷得到良好分离；TiONTAs的大比表面积和改善的电极催化活性导致高效的电极表面反应动力学。这项工作提出了一种新的通用PEC酶促形式，可扩展用于制备针对DNA、蛋白质和氧化酶底物等生物分子的不同PEC生物传感器。
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