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Article
Porphyrin Langmuir-Blodgett Thin Film for Organic Vapor Detection
Author(s)
Rifat Çapan
Full-Text PDF XML 922 Views
DOI:10.17265/2159-5348/2019.01.002
Affiliation(s)
Physics Department, Science Faculty, Balıkesir University, Balıkesir 10145, Turkey
ABSTRACT
The detection of volatile
organic compounds (VOC’s) is a very important task due to stringent
environmental standards and regulations on VOC’s in many countries. They are
highly toxic and may cause metabolic diseases, genetic disorders, acute,
chronic or long-term effects and cancer. In order to control the air quality
and human health respect to standards and regulations gas sensors are widely
used to measure the level of VOCs. The performance of the gas sensing devices
mostly depends on the performance of the sensing materials which depends on
their chemical structures. Organic materials are widely studied in the field of
VOC’s sensor application due to their low cost, physical and chemical
properties. Porphyrin molecule was deposited as an Langmuir-Blodgett thin film
onto gold substrates for the study of sensor properties using benzene, toluene,
ethyl benzene and xylene. Surface plasmon resonance technique was employed for
the characterization of these LB films. A high quality and uniform Langmuir
monolayer from the water surface can be transferred onto a gold coated
substrate with a transfer ratio of over 90%. For the sensing application
towards benzene vapor, this LB film yields a fast and almost fully reversible
response to benzene in few seconds.
KEYWORDS
Porphyrin, vapor sensing, langmuir-blodgett, surface plasmon resonance.
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