Graphene Langmuir-Schaefer films Decorated by Pd Nanoparticles for NO2 and H2 Gas Sensors
| Autor: | Peter Siffalovic, Eva Majkova, Ján Ivančo, Monika Benkovičová, Dmytro Kostiuk, Matej Jergel, Stefan Luby |
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| Rok vydání: | 2019 |
| Předmět: |
Langmuir
Materials science Graphene no2 and h2 sensing Biomedical Engineering Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention few-layer graphene Few layer graphene gas sensors Control and Systems Engineering law Pd nanoparticles pd nanoparticles QA1-939 0210 nano-technology Instrumentation Mathematics |
| Zdroj: | Measurement Science Review, Vol 19, Iss 2, Pp 64-69 (2019) |
| ISSN: | 1335-8871 |
| DOI: | 10.2478/msr-2019-0011 |
| Popis: | NO2 and H2 gas sensing by few-layer graphene (FLG) were studied in dependence on the annealing and decoration of graphene by palladium nanoparticles (NPs). Graphene was deposited onto SiO2 (500 nm)/Si substrates by a modified Langmuir-Schaefer technique. A solution of FLG flakes in 1-methyl-2-pyrrolidone was obtained by a mild sonication of the expanded milled graphite. FLG films were characterized by atomic force microscopy, X-ray diffraction, Raman spectroscopy, and the Brunnauer-Emmett-Teller method. Average FLG flake thickness and lateral dimension were 5 nm and 300 nm, respectively. Drop casting of Pd NP (6–7 nm) solution onto FLG film was applied to decorate graphene by Pd. The room temperature (RT) resistance of the samples was stabilized at 15 kΩ by vacuum annealing. Heating cycles of FLG film revealed its semiconducting character. The gas sensing was tested in the mixtures of dry air with H2 gas (10 to 10 000 ppm) and NO2 gas (2 to 200 ppm) between RT and 200 °C. The response of 26 % to H2 was achieved by FLG with Pd decoration at 70 °C and 10 000 ppm of H2 in the mixture. Pure FLG film did not show any response to H2. The response of FLG with Pd to 6 ppm of NO2 at RT was ≥ 23 %. It is 2 times larger than that of the pure FLG sample. Long term stability of sensors was studied. |
| Databáze: | OpenAIRE |
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