A miniature photoelectrochemical sensor based on organic electrochemical transistor for sensitive determination of chemical oxygen demand in wastewaters
A miniature photoelectrochemical sensor based on organic electrochemical transistor for sensitive determination of chemical oxygen demand in wastewaters
复制标题
基于有机电化学晶体管的微型光电化学传感器，用于灵敏测定废水中的化学需氧量
DOI：
10.1016/j.watres.2016.02.061
复制
发表时间：
2016
期刊：
影响因子：
12.8
通讯作者：
Yang Yue
中科院分区：
文献类型：
--
作者：
Liao Jianjun;Lin Shiwei;Zeng Min;Yang Yue
在传统的光电化学测量中，通常需要三电极结构。然而，一个共同的缺点是测量中使用的参比电极和对电极，这已被证明是小型化的障碍。本研究基于高灵敏度有机电化学晶体管(OECT)研制了一种简单、经济、小型化的光电化学传感器，并将其应用于废水中化学需氧量(COD)的测定。该装置的检出限为0.01mgCOD/L，比常规光电化学方法提高了两个数量级。这种优异的传感性能可以归功于光电转换器件新颖的传感机制。也就是说，器件对二氧化钛纳米管阵列栅电极上的光电化学反应引起的电位变化很敏感。并进行了实际样本分析。结果表明，用OECT装置测得的COD值与标准重铬酸盐法测得的COD值吻合较好。由于该传感器是建立在微型晶体管上的，因此有望在COD综合监测平台上显示出良好的应用前景。
A three-electrode configuration is often required in the conventional photoelectrochemical measurements. Nevertheless, one common drawback is the reference electrode and the counter electrode used in the measurements, which has been proved to be an impediment for the miniaturization. In this study, a simple, cost-effective and miniature photoelectrochemical sensor based on high sensitive organic electrochemical transistor (OECT) is developed and used for the determination of chemical oxygen demand (COD) in wastewaters. The devices show detection limit down to 0.01 mg/L COD, which is two orders of magnitude better than that of the conventional photoelectrochemical method. The excellent sensing performance can be contributed to the novel sensing mechanism of OECT devices. That is, the devices are sensitive to the potential changes induced by the photoelectrochemical reaction on TiO2nanotube arrays gate electrodes. Real sample analyses are also carried out. The results demonstrate that the measured COD values using the OECT devices and the standard dichromate methods are in a good agreement. Since the proposed sensor is constructed on a miniature transistor, it is expected that the device shows a promising application on the integrated COD monitoring platform.