Polypyrrole-Tungsten Oxide Nanocomposite Fabrication through Laser-Based Techniques for an Ammonia Sensor: Achieving Room Temperature Operation

A highly sensitive ammonia-gas sensor based on a tungsten trioxide and polypyrrole (WO /PPy) nanocomposite synthesized using pulsed-laser deposition (PLD) and matrix-assisted pulsed-laser evaporation (MAPLE) is presented in this study. The WO /PPy nanocomposite is prepared through a layer-by-layer a...

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Bibliographic Details
Published in:	Polymers Vol. 16; no. 1; p. 79
Main Authors:	Filipescu, Mihaela, Dobrescu, Stefan, Bercea, Adrian Ionut, Bonciu, Anca Florina, Marascu, Valentina, Brajnicov, Simona, Palla-Papavlu, Alexandra
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 26-12-2023 MDPI
Subjects:	Ammonia Composite materials Contact angle Electrodes Fourier transforms gas sensor Gas sensors Gases Heterojunctions laser Laser applications Lasers Metal oxides Methods Microscopy Nanocomposites P-n junctions Polymerization Polymers polypyrrole Polypyrroles Pulsed laser deposition Pulsed lasers Raman spectroscopy Recovery time Room temperature Scanning electron microscopy Semiconductors Sensors Spectrum analysis Temperature Thin films Tungsten compounds tungsten oxide Tungsten oxides France United States > US Germany polypyrrole pulsed-laser deposition laser ammonia gas sensor tungsten oxide matrix-assisted pulsed-laser evaporation
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Summary:	A highly sensitive ammonia-gas sensor based on a tungsten trioxide and polypyrrole (WO /PPy) nanocomposite synthesized using pulsed-laser deposition (PLD) and matrix-assisted pulsed-laser evaporation (MAPLE) is presented in this study. The WO /PPy nanocomposite is prepared through a layer-by-layer alternate deposition of the PPy thin layer on the WO mesoporous layer. Extensive characterization using X-ray diffraction, FTIR and Raman spectroscopy, scanning electron microscopy, atomic force microscopy, and water contact angle are carried out on the as-prepared layers. The gas-sensing properties of the WO /PPy nanocomposite layers are systematically investigated upon exposure to ammonia gas. The results demonstrate that the WO /PPy nanocomposite sensor exhibits a lower detection limit, higher response, faster response/recovery time, and exceptional repeatability compared to the pure PPy and WO counterparts. The significant improvement in gas-sensing properties observed in the WO /PPy nanocomposite layer can be attributed to the distinctive interactions occurring at the p-n heterojunction established between the n-type WO and p-type PPy. Additionally, the enhanced surface area of the WO /PPy nanocomposite, achieved through the PLD and MAPLE synthesis techniques, contributes to its exceptional gas-sensing performance.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2073-4360 2073-4360
DOI:	10.3390/polym16010079