Crowley Karl, O'Malley Eimer, Morrin Aoife, Smyth Malcolm R, Killard Anthony J
School of Chemical Sciences, National Centre for Sensor Research, Dublin City University, Dublin 9, Ireland.
Analyst. 2008 Mar;133(3):391-9. doi: 10.1039/b716154a. Epub 2008 Jan 31.
A sensor for the amperometric detection of aqueous ammonia was fabricated using the inkjet printing of dodecylbenzene sulfonate (DBSA)-doped polyaniline nanoparticles (nanoPANI) onto a screen-printed carbon paste electrode. The combination of the environmentally inert, aqueous nanoparticle dispersion with the inkjet printing technique allowed the rapid fabrication of sensors based on polyaniline that was not easily achievable in the past due to the lack of processability of bulk forms of the conducting polymer. The resulting modified electrode was characterised with respect to its operating pH and number of print layers and was found to perform optimally at near neutral pH with four nanoPANI inkjet-printed layers. The sensor was tested in a flow injection system for its response to aqueous ammonia using amperometric detection at -0.3 V vs. Ag/AgCl pseudo-reference and was found to have reproducibility to injections of ammonia of below 5% RSD and good sensitivity with an experimental detection limit of 20 microM and a theoretical detection limit of 3.17 microM (0.54 ppm). The sensor was also tested for its day-to-day stability and its response towards a range of interferents common to refrigerant waste waters. This system allows the rapid production of an ultra-low-cost, solid state, polyaniline-based aqueous ammonia sensor.
通过将十二烷基苯磺酸盐（DBSA）掺杂的聚苯胺纳米颗粒（nanoPANI）喷墨打印到丝网印刷的碳糊电极上，制备了一种用于安培检测氨水的传感器。环境惰性的水性纳米颗粒分散体与喷墨打印技术相结合，使得基于聚苯胺的传感器能够快速制备，而由于导电聚合物本体形式缺乏可加工性，过去难以轻易实现这一点。对所得修饰电极的工作pH值和打印层数进行了表征，发现其在接近中性pH值且有四层纳米聚苯胺喷墨打印层时性能最佳。该传感器在流动注射系统中进行测试，使用相对于Ag/AgCl伪参比电极在-0.3 V下的安培检测来检测其对氨水的响应，发现其对氨注射的重现性低于5%RSD，灵敏度良好，实验检测限为20 microM，理论检测限为3.17 microM（0.54 ppm）。还测试了该传感器的日常稳定性及其对一系列制冷剂废水常见干扰物的响应。该系统能够快速生产出超低成本、固态、基于聚苯胺的氨水传感器。
