Abstract The role of anatase TiO2 in the performance of carbon paste electrodes (CPE) electrochemical sensors for detection of cypermethrin pesticide has been investigated. It was found that the anatase TiO2-CPE nanocomposites electrode exhibits excellent sensitivity towards the cypermethrin and its sensing sensitivity increases with the increasing of anatase TiO2 concentration and optimum at a concentration of 2 w/w (CPE is ~3 w/w). The detection limit of the nanoelectrode can be down to the level of ~ 0.1 ppm, which is below the maximum residual limits of cypermethrin in the environment (~ 0.5 ppm) and is in the allowed limit for food products (~0.05 to 0.2 ppm). The nanoelectrode is also excellent in the chemical stability with a performance decreasing (%RSD) is only ~0.37% for 11 times repeated measurement. The enhancement of the electron transfer rate in the present of anatase TiO2 in the CPE matrix as the result of excellent physico-chemical properties of anatase TiO2 is considered as the key reason for the enhanced performance. The anatase TiO2-CPE system should find potential application in cypermethrin pesticide monitoring in environment and agricultural products control.

中文翻译：

---

使用锐钛矿型 TiO2-碳糊纳米复合电极进行高效氯氰菊酯农药检测

摘要 锐钛矿 TiO2 在碳糊电极 (CPE) 电化学传感器检测氯氰菊酯农药中的作用已被研究。发现锐钛矿TiO2-CPE纳米复合电极对氯氰菊酯表现出优异的灵敏度，其传感灵敏度随着锐钛矿TiO2浓度的增加而增加，最佳浓度为2w/w（CPE为~3w/w）。纳米电极的检测限可降至~0.1 ppm 的水平，低于环境中氯氰菊酯的最大残留限量（~ 0.5 ppm），并在食品的允许限值内（~ 0.05 至 0.2 ppm） . 该纳米电极在化学稳定性方面也非常出色，11 次重复测量的性能下降 (%RSD) 仅为 ~0.37%。由于锐钛矿 TiO2 优异的物理化学性质，在 CPE 基质中存在锐钛矿 TiO2 时电子转移速率的提高被认为是提高性能的关键原因。锐钛矿 TiO2-CPE 系统应在环境和农产品控制中的氯氰菊酯农药监测中找到潜在的应用。