Polyaniline/poly acid acrylic thin film composites: a new gamma radiation detector

In this paper, we present a new and straightforward route to prepare polyaniline/poly acid acrylic (PAA) thin film composites in large areas and on almost any surface. This method was developed to improve the mechanical and adherence properties of polyaniline devices used as ionization radiation sen...

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Bibliographic Details
Published in:Materials characterization 2003-03, Vol.50 (2), p.245-248
Main Authors: Lima Pacheco, Ana P., Araujo, Elmo S., de Azevedo, Walter M.
Format: Article
Language:English
Subjects:
ABSORPTION
ACRYLIC ACID
ANILINE
Composite
DOPED MATERIALS
GAMMA RADIATION
IONIZATION
MATERIALS SCIENCE
METALS
Poly(acrylic acid)
Polyaniline
POLYMERIZATION
POLYMERS
RADIATION DOSES
SOLUTIONS
SURFACES
THIN FILMS
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Summary:In this paper, we present a new and straightforward route to prepare polyaniline/poly acid acrylic (PAA) thin film composites in large areas and on almost any surface. This method was developed to improve the mechanical and adherence properties of polyaniline devices used as ionization radiation sensors. The route consists of the combination of the metal oxidant with polymer acid to form a highly homogeneous and viscous paste, which can be easily spread over any surface. In the second step, an aniline acid solution is brought in contact with the dried paste where polymerization occurs, yielding a high homogeneous and conducting polymer composite. The UV–visible absorption and infrared analysis confirm that a polyaniline/PAA complex is obtained. The four-point conductivity measurements show that the composite conductivity ρ is the order of 5 Ω −1 cm −1. Preliminary gamma radiation interaction with the composite shows that the doped composite exhibits a linear response that can be used in the development of real-time radiation sensors for the dose range from 0 to 5000 Gy.
ISSN:1044-5803
1873-4189
DOI:10.1016/S1044-5803(03)00090-1