基于石墨烯/金属氧化物的电导式全固态pH传感器的研究

pH is one of the most important parameters of an aqueous solution. It’s of great importance to realize the real-time dynamic monitoring of surface water and household drinking water. However, present pH detection methods couldn’t meet the requirements in long-time continuous surface water and household drinking water area due to the presence of reference electrodes. In this project, conductimetric solid-state pH sensors are proposed and investigated, which are based on graphene and metal oxide materials, combining the large specific surface area and high conductivity properties of graphene and good pH sensitive property of metal oxide materials. Interdigital electrodes are used as the working electrodes in this kind of sensors, without the participation of reference electrodes. The proposed sensors overcome the drawbacks of traditional pH sensors and can be used in long-time continuous monitoring of surface water and household drinking water.

作为水质分析领域的重要参数，pH的检测至关重要。地表水和家庭饮用水中pH的实时动态监测具有重要的意义。目前的pH检测方法因参比电极的存在难以实现地表水和家庭饮用水的长时间（>3个月）连续监测的需求。本项目以石墨烯材料和金属氧化物材料为基础，利用石墨烯材料的大比表面积和高导电率特性及金属氧化物材料的良好pH敏感特性，研制基于复合材料的电导式全固态pH传感器。该传感器以叉指电极为工作电极，无需参比电极参与，克服了传统pH传感器的缺陷，可实现地表水及家庭饮用水的长时间连续监测。

作为水质分析分析领域的重要参数，pH的检测至关重要。地表水和家庭饮用水中pH的实时动态监测具有重要的意义。本项目以石墨烯材料和金属氧化物材料为基础，利用石墨烯材料的大比表面积和高导电率特性及金属氧化物材料的良好pH敏感特性，研制基于RuO2-石墨烯复合材料的全固态pH传感器。该传感器在pH2-12的范围内展现出了较好的pH敏感特性（~48 mV/pH），同时对传感器的响应机理、水合化作用、漂移性和迟滞效应、响应时间等性能进行了深入研究，研究表明，此项目研发的传感器克服了传统pH传感器的缺陷，可实现地表水及家庭饮用水的长时间连续监测。