Title :
An electrical characterization of DPPE/valinomycin films on platinum surfaces in aqueous solutions
Author :
Fare, Thomas L. ; Chang, Eddie
Author_Institution :
US Naval Res. Ltd., Washington, DC, USA
Abstract :
The electrical properties of multilayers of dipalmitoyl phosphatidylethanolamine/valinomycin films transferred onto platinum wires using the Langmuir-Blodgett process have been investigated. The impedance of the lipid films on the platinum is determined at fixed film surface pressure, ionic strength, and pH of the trough. The measurement of the impedance of the film is used to determine the electrical quality of the film. Injection of potassium into the subphase causes a decrease in the impedance of the film, whereas sodium does not affect the impedance. These results serve as the basis for analyzing lipid and fatty acid films in aqueous environments for sensor applications
Keywords :
Langmuir-Blodgett films; biosensors; K; Langmuir-Blodgett process; Na; Pt; aqueous environments; aqueous solutions; dipalmitoyl phosphatidylethanolamine/valinomycin films; electrical characterization; electrical properties; fatty acid film; film electrical quality; film impedance; film surface pressure; ionic strength; lipid film; multilayers; pH; Counting circuits; Electric variables measurement; Electrodes; Impedance measurement; Lipidomics; Nonhomogeneous media; Platinum; Sensor phenomena and characterization; Surface impedance; Wires;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.96249
