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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:35 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Polymer Physics
Title:
Polymeric coatings obtained by MAPLE for sensing applications
Authors:
Valentina DINCA (1), Simona BRAJNICOV (1,2), Valentina MARASCU (1,3), Cristian VIESPE (1), Maria DINESCU (1), Nicu SCARISOAREANU (1)
Affiliation:
1) National Institute for Lasers, Plasma and Radiation Physics, Bucharest, Romania
2) University of Craiova, Romania
3) University of Bucharest -Faculty of Physics, Bucharest, Romania
E-mail
valentina.dinca@inflpr.ro
Keywords:
chemical sensors, polymeric coatings, MAPLE-deposited thin films, organophosphate compounds
Abstract:
The development of sensitive chemical sensors for the detection and measurements of contaminants is of high interest for environmental safety as well as on public health and homeland security. In this work, we report on obtaining active polymeric based membrane using Matrix assisted pulsed Laser Evaporation-MAPLE for chemical sensors applications. The deposition process of the polymer was carried out using an Nd:YAG pulsed laser, operating at different fluences (0.2–0.8 J/cm2 ) with a wavelength of 266 nm and a repetition rate of 10 Hz. It was found that for specific range of fluences the main functional groups in the MAPLE-deposited thin films determined by Fourier transform infrared spectroscopy revealed the similarity with the molecular structures of the initial material. However, there were significant changes depending on the deposition parameters in morphologies revealed by Atomic Force Microscopy and Scanning Electron Microscopy. The surface acoustic wave sensors have been tested using the Network Analyzer before and after polymer deposition. The polymer coated surface acoustic wave sensors responses have been measured upon exposure to various concentrations of organophosphate analyte. All sensors coated showed a clear response to the tested vapor. The materials employed provided sensing units with high specific surface area yielding the development of a sensor with suitable stability, good reproducibility, and high sensitivity towards samples. Our results indicate that the sensor system can be used as a rapid, simple alternative in the analyses of organophosphate compounds.
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