Optical gas sensing using Langmuir-Blodgett films

A polysiloxane with sidechain azobenzene chromophores has been deposited as Langmuir-Blodgett films on silicon. Using interference-enhanced reflectometry with films selected to give low reflectance of 520 nm light in air, reflectance changes of 75% were recorded on exposure to 100 ppm NO 2 in air. R...

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Bibliographic Details
Published in:Materials Science & Engineering C 1995-12, Vol.3 (3), p.257-262
Main Authors: Miller, L.S., McRoberts, A.M., Walton, D.J., Parry, D.A., Newton, A.L.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Gas sensing
Interference reflectometry
Langmuir-Blodgett film
Physicochemistry of polymers
Polymers and radiations
Polysiloxane
Properties and characterization
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Summary:A polysiloxane with sidechain azobenzene chromophores has been deposited as Langmuir-Blodgett films on silicon. Using interference-enhanced reflectometry with films selected to give low reflectance of 520 nm light in air, reflectance changes of 75% were recorded on exposure to 100 ppm NO 2 in air. Response and recovery times were of the order of 10 s, and recovery was effectively complete. The mechanism of response and factors such as long-term stability have yet to be fully investigated.
ISSN:0928-4931
1873-0191
DOI:10.1016/0928-4931(95)00084-4