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- Title
Investigation of Drift in Polyurethane Matrices for Salivary Nitrate Ion-selective Field-effect Transistors.
- Authors
Shuto Osaki; Kenichi Kitamura; Takuya Kintoki; Takayo Moriuchi-Kawakami; Shin-ichi Wakida
- Abstract
We systematically investigated the drift of ion-selective field-effect transistors (ISFETs) using a series of polyurethanes as a polymer matrix. Drift is one of the shortcomings of ISFETs that adopt a polymeric ion-selective membrane. The drift is caused by the pH change in the aqueous layer between the ion-selective membrane and the pH-sensitive gate of the ISFET. We previously reported NO3--ISFETs with a novel polyurethane P7281-PU, which give specific stable values. This polyurethane showed less drift than conventional polyvinyl chloride. We considered that the urethane bonds in the ion-selective membrane might capture the diffused H+ or OH- ions that induce the drift. In this study, we investigate a polyurethane composed of an ion-selective membrane and consider how the condition and performance of the ion-selective membrane affect the drift. We selected eight types of polyurethane with almost the same composition as P7281-PU for comparison. We confirmed a narrower variation range of 4.5 mV/h from ISFETs with polyurethane P7293-PU than those of 33.7 mV/h from PVC and 5.0 mV/h from P7281-PU through drift tests using artificial saliva. From the tests, we also confirmed that the drift prevention effect might be caused by the ion-trapping sites generated with the hydrolysis of the urethane bonds.
- Subjects
FIELD-effect transistors; POLYURETHANES; ARTIFICIAL saliva; POLYMERIC membranes; URETHANE; POLYVINYL chloride; POLYURETHANE elastomers
- Publication
Sensors & Materials, 2022, Vol 34, Issue 11.Part 4, p4209
- ISSN
0914-4935
- Publication type
Article
- DOI
10.18494/SAM4105