Year: 1997
Type: article
Abstract: The composition of ammonium‐ion sensitive membrane based on a photocurable aliphatic urethane diacrylate oligomer has been optimized. Membranes were prepared with exposure to UV and studied in a traditional ion‐selective electrode configuration with liquid inner contact. The optimum composition is found to be: urethane diacrylate (45 to 50%), hexandiol diacrylate (10%), photoinitiator (0.8 to 1.2%), plasticizer (bis(2‐ethylhexyl) sebacate or di‐5‐nonyladipate (35 to 40%), nonactin (2%), and KTpClPB (0.5%). The resulting ion‐sensors show a sensitivity of 55.5 mV/decade, a range of linear response from 1 to 4.5 ⋅ 10 −4 mol/liter of , a limit of detection around 10 −5 mol/liter, and good selectivity in the presence of potassium ions. Introduction of 7% PVC into the membrane formulation gives a possibility to enhance the sensitivity up to 58 mV/decade but prevents application of photolithography for membrane patterning in case of ion sensitive field effect transistor‐based sensors. The developed polymer composition was used to prepare ISFET‐based ammonium sensors with the membrane deposited and structured on a wafer level.
DOI: 10.1149/1.1837456
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2010597215