Capacitance response of polysiloxane films with interdigital electrodes to volatile organic compounds

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Typical interdigital capacitive sensors (IDC-S), are made of an 'inert' substrate over which two planar interdigital electrodes are deposited. One chemical sensitive layer is then deposited over the electrodes. The sensitive layer can be chosen according to its partition coefficient to a given organic volatile. The change in capacitance of these sensors by the sorption of the analyte molecules depends on the changes in the dielectric permittivity and on swelling of the polymer layer. These types of sensors enable a wide choice of polymeric sensitive layers, which can be especially chosen for the case studied. If several sensors with different sensitive layers are used to make a sensor array it is then possible to evaluate complex gas samples. Two different polymeric layers are studied, polydimethylsiloxane (PDMS) and polyocthylmethylsiloxane (POMS) for different volatile organic compounds in aqueous solutions.

Original languageEnglish
Title of host publicationAdvanced Materials Forum II: Proceedings of the II International Materials Symposium: Materials 2003 and XI Encontro da Sociedade Portugesa de Materials, 2003
EditorsR. Martins, E. Fortunato, I. Ferreira, C. Dias
PublisherTrans Tech Publications Ltd
Pages420-424
Number of pages5
Volume455-456
DOIs
Publication statusPublished - 28 Jul 2004
Event2nd International Materials Symposium - Caparica, Portugal
Duration: 14 Apr 200316 Apr 2003

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications Ltd
Volume455-456
ISSN (Print)0255-5476

Conference

Conference2nd International Materials Symposium
CountryPortugal
CityCaparica
Period14/04/0316/04/03

Keywords

  • Chemical Sensors
  • Electroactive polymers
  • Interdigital electrodes
  • PDMS and POMS

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