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Characterisation of porosity and sensor response times of sol-gel-derived thin films for oxygen sensor applications

Bowe, Philip (2003) Characterisation of porosity and sensor response times of sol-gel-derived thin films for oxygen sensor applications. Master of Science thesis, Dublin City University.

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The ability to determine oxygen concentration is of great importance in many industrial, environmental and medical applications. In recent years, a range of sol-gelderived optical oxygen sensors, for measuring oxygen in both gas and aqueous phase has been developed, in which the oxygen sensitive dye Ru(II)-tris(4,7 - diphenyl-1, 10-phenanthroline) has been entrapped. The porosity of the matrix plays a vital role in determining both the sensitivity and response time of such optical sensors. For gas sensors, the diffusion coefficient for the analyte gas through the matrix increases with film porosity. This in turn increases the sensitivity of the sensor response via the Stern-Volmer coefficient. The response and recovery times are also related to porosity via the diffusion coefficient. This project focuses on the fabrication of a wide range of sol-gel-derived thin films as well as the development of experimental systems used to calculate the porosity and response times of a wide range of sol-gel-derived thin films. A method to calculate the diffusion coefficient using response and recovery times as well as film thickness is also detailed. Measured response times were correlated with porosity, Stern-Volmer coefficients and diffusion coefficients data. The Stern-Volmer equation was also used to characterise and explain specific film behavior. A fabrication method used to control the refractive index of sol-gel thin films is also detailed and the consequence this has on the film characteristics is investigated.

Item Type:Thesis (Master of Science)
Date of Award:2003
Supervisor(s):MacCraith, Brian
Uncontrolled Keywords:oxygen; sensors; sol-gel
Subjects:Physical Sciences > Thin films
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Physical Sciences
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
ID Code:17390
Deposited On:04 Sep 2012 11:05 by Fran Callaghan. Last Modified 04 Sep 2012 11:05

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