分析化学2012，Vol.40Issue(2)：196-200,5.DOI:10.3724/SP.J.1096.2012.10367
用于氨氮检测的薄层氨气微传感芯片及其系统研究
Thin Layer Ammonia Microsensor Chip and System for Measurement of Ammonia Nitrogen
摘要
Abstract
An ammonia microsensor chip based on a thin liquid layer in micro-pool has been designed and prepared. An ammonia nitrogen measurement system utilizing such a miniaturized sensor chip has been constructed. The method of ammonia nitrogen measurement using an amperometric ammonia microsensor was investigated. The sensor chip was fabricated by microelectromechanical system (MEMS). Platinum nanoparticles, possessing excellent electrochemical catalysis to ammonia, were modified on the bare microelectrodes of the sensor by electrochemical methods to enhance the sensitivity. A tiny amount of propylene carbonate (PC) was dripped into SU-8 micro-pool to form the thin layer electrolyte which facilitated ammonia to diffuse to the microelectrode surface, thus achieving a fast response time. Measurement of ammonia nitrogen using the self-designed measurement system was presented. The characterizations of the sensor, including relationship between response and sample concentration, response times, reproducibility and selectivity were demonstrated. A linear calibration curve between 0. 1 - 5 mg/L was obtained. Meanwhile a limit of detection, 0. 1 mg/L, was achieved. The response time was less than 1 minute. The relative standard deviation (RSD) was 4.0%.关键词
水质监测/氨氮/氨气微传感芯片/碳酸丙烯酯/薄液层Key words
Water quality monitoring/ Ammonia nitrogen/ Ammonia microsensor chip/ Propylene carbonate/ Thin liquid layer引用本文复制引用
卞贺明,边超,佟建华,孙楫舟,张虹,韩泾鸿,夏善红..用于氨氮检测的薄层氨气微传感芯片及其系统研究[J].分析化学,2012,40(2):196-200,5.基金项目
本文系国家重点基础研究发展规划"973"项目(No.2009CB320300)和国家自然科学基金项目(Nos.60971070,61072023)资助 （No.2009CB320300）
