DC-resistometric urea sensitive device utilizing a conducting polymer film for the gas-phase detection of ammonia

• Published in: Biosensors & bioelectronics Vol. 10; no. 3; pp. 283 - 287
• Main Authors: Palmqvist, Eva, Berggren Kriz, Christine, Svanberg, Katarina, Khayyami, Masoud, Kriz, Dario
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 1995; Elsevier Science
• Subjects: Ammonia; Atom and Molecular Physics and Optics; Atom- och molekylfysik och optik; Biological and medical sciences; biosensor; Biosensors; Biotechnology; DC-resistometry; Fundamental and applied biological sciences. Psychology; Fysik; gas phase; Methods. Procedures. Technologies; Natural Sciences; Naturvetenskap; Physical Sciences; polypyrrole; urea sensitive device; Various methods and equipments; polypyrrole; urea sensitive device; gas phase; DC-resistometry; biosensor; Performance evaluation; Cyclic voltammetry; Ammonia; Urea; Enzyme; Biosensor; Hydrolases; Electronic circuit; Urease; Gas phase; Resistor; Pyrrole polymer
• ISSN: 0956-5663; 1873-4235; 1873-4235
• DOI: 10.1016/0956-5663(95)96847-R

The construction of an urea sensitive device based on a conducting polymer is described. The conducting polymer (polypyrrole) was exposed only to a gas-phase; this led to a significant improvement in its stability. A DC-resistometric measuring principle was used, which required only simple measuring equipment. The device responded rapidly to between 0 and 500 mM urea, with resistance changes of between 0 and 400 Ohms. The measurement of the urea content of a sample and subsequent regeneration took 20 min.