A real-time on-line photoelectrochemical sensor toward chemical oxygen demand determination based on field-effect transistor using an extended gate with 3D TiO2 nanotube arrays

A real-time on-line photoelectrochemical sensor toward chemical oxygen demand determination based on field-effect transistor using an extended gate with 3D TiO2 nanotube arrays
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基于场效应晶体管的实时在线光电化学传感器,使用具有 3D TiO2 纳米管阵列的扩展栅极来确定化学需氧量

DOI:
10.1016/j.snb.2019.03.071
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发表时间:
2019-06
期刊:
Sensors and Actuators B: Chemical
影响因子:
--
通讯作者:
Lin Shiwei
Lin Shiwei
中科院分区:
其他
文献类型:
--
作者:
Si Hewei;Pan Nengqian;Zhang Xidong;Liao Jianjun;Rumyantseva M N;Gaskov A M;Lin Shiwei

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化学需氧量(COD)是水质评价中应用最广泛的参数之一。定量检测COD的微小波动,对于及早发现水环境的异常变化至关重要。在这里,我们报告了一个实时在线光电化学方法灵敏的COD检测使用扩展栅场效应晶体管(EGFET)传感器。FET栅极由Ti网状电极和Pt纳米颗粒修饰的3D TiO 2纳米管阵列组成。在1.0 mL/s的连续流速下,该装置的COD检测限可达0.12 mg/L,线性范围为1.44 ~ 672 mg/L。该方法具有良好的稳定性、准确性和重现性。更重要的是,该方法用于真实的水样分析,与标准重铬酸盐法的结果一致。结果表明,基于EGFET的光电化学传感器是潜在的候选人,为实际的COD现场测量。
Chemical oxygen demand (COD) is one of the most widely used parameters for water quality assessment. Quantification and detection of COD slight fluctuations is crucial for an early detection of abnormal change in the water environment. Here we report a real-time on-line photoelectrochemical method for sensitive COD detection using an extended-gate field-effect transistor (EGFET) sensor. The FET gate consists of a Ti mesh electrode with 3D TiO2nanotube arrays modified by Pt nanoparticles. The device shows a COD detection limit down to 0.12 mg/L and a wide dynamic linear range from 1.44 mg/L to 672 mg/L at a continuous flow rate of 1.0 mL/s. The method reported also displays excellent stability, accuracy and reproducibility. More importantly, real water samples analyses with the proposed method are in a good agreement with the standard dichromate method. The results suggest that the EGFET-based photoelectrochemical sensors are potential candidates for practical COD onsite measurement.
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