Polypyrrole thin films for gas sensors prepared by Matrix-Assisted Pulsed Laser Evaporation technology: Effect of deposition parameters on material properties |
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Authors: | Dušan Kopecký Martin Vrňata Vladimír Myslík Ond?ej Ekrt Miroslav Jelínek |
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Affiliation: | a Institute of Chemical Technology Prague, Department of Physics and Measurements, Technická 5, Praha 6, 166 28-CZ, Czech Republic b Institute of Chemical Technology Prague, Department of Solid State Engineering, Technická 5, Praha 6, 166 28-CZ, Czech Republic c Institute of Chemical Technology Prague, Department of Analytical Chemistry, Technická 5, Praha 6, 166 28-CZ, Czech Republic d Czech Academy of Sciences, Institute of Physics, Na Slovance 2, Prague 8, 182 21-CZ, Czech Republic |
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Abstract: | Thin films of polypyrrole (PPY) were prepared by Matrix-Assisted Pulsed Laser Evaporation (MAPLE) technology from two matrices: water and dimethylsulfoxide (DMSO). The deposition was carried out using a KrF excimer laser (laser fluence F ranged from 0.1 to 0.6 J cm− 2). This work deals with optimization of two deposition parameters - laser fluence and number of pulses - for both matrices. From the deposition curves, the fluence thresholds, Fth, and maximum growth rates were subsequently determined (water matrix: Fth ~ 0.40-0.45 J cm− 2, maximum growth rate 0.16 nm pulse− 1; DMSO matrix: Fth ~ 0.25-0.30 J cm− 2; maximum growth rate 0.20 nm pulse− 1). The changes in chemical composition of deposited layers were studied by Attenuated Total Reflection Fourier Transform Infrared spectroscopy. Surface morphology was characterized by Atomic Force Microscopy. A discussion is also presented concerning relationships between laser fluence and chemical composition of deposited layers with respect to their potential application in gas sensors. Finally, the response of a sensor with a MAPLE deposited PPY active layer to air humidity is presented. |
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Keywords: | Laser deposition Polypyrrole Fourier transformed infrared spectroscopy Surface morphology Gas sensors |
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