摘要
采用微机电系统(MEMS)工艺制备金叉指超微电极阵列(IDA),通过电化学沉积技术在电极表面修饰纳米银钯双金属复合物敏感膜,制得一种新型总氮微型电化学传感器。该纳米银钯双金属复合材料修饰电极可实现在强碱溶液环境中(pH 12.0~12.5)对硝酸根离子的电催化还原,从而避免了繁琐的总氮消解水样pH调节,实现了总氮直接检测的目标。实验结果表明,该传感器在强碱溶液环境中对硝酸根具有高灵敏的伏安响应(灵敏度为37.9mA/mmol),响应电流在总氮I^V类水浓度(0~2.0mg/l)范围内有良好的线性关系(线性度为99.43%),该传感器具有良好的抗干扰性和一致性,使用寿命可达到30天,并实现了实际水样总氮检测。
A novel total nitrogen （TN） electrochemical microsensor is designed based on silver-palladium composition nanomaterial which is modified with MEMS gold interdigitated ultramicroband array （IDA） on electrode surface by using electrochemical deposition technique. The electrodes modified with silver-palladium composition nanomaterial can be used to complete electrocatalytic reduction of Nitroniumion in strong alkaline solution （pH 12.0-12.5）, and achieve the goal of direct detection of TN without complex pH adjusting. The experiment results show that the sensor shows good voltage-current response with high sensitivity （37.9μA/ mmol） for Nitroniumion in strong alkaline solutions and linear relationship （99.43%） within TN concentration range from 0 to 2.0mg/l. In addition, the good selectivity, coherency and long detection life up to 30 days are also demonstrated. With the novel TN microsensor, real water samples from lakes and rivers are measured.
出处
《传感器世界》
2014年第1期7-13,共7页
Sensor World
基金
国家重点基础研究发展计划(973计划)资助项目(编号:2009CB320300)
国家自然科学基金资助项目(编号:60971070)
关键词
纳米银钯复合材料
超微电极
修饰电极
总氮检测
微型电化学传感器
Total Nitrogen （TN）
silver-palladiumcomposition nanomaterial
ultra-microeleetrode
modifiedelectrode
electrochemical microsensor
