Perfomance Study of Urease-PMMA-Based Aqueous Urea Sensor

This paper presents the development of a simple, low cost, the new type of urea sensor, and suitable for water quality monitoring. Here, urease is immobilized on the electrodes using Poly(methyl methacrylate) polymer. The sensing technique is based on two-electrodes-based impediometry which gives an electrical output; hence, suitable to be further processed electronically. In this paper, ten different batches of sensors have been fabricated and tested over a year. Analyzing these experimental results, an optimized fabrication technique for the proposed sensor as well as suitable sensing principle has been developed. Such optimized sensor can measure 0.005% to 5% [wt(g)/vol(ml)] urea concentration in water. The longevity of the proposed sensor has been improved by using a top layer coating of a polymer, named DQN-60.