Effective hydrogen gas sensor based on palladium nanoparticles dispersed on graphene sheets by spin coating technique
Autor: | Chaisak Issro, Wolfgang Pfeiler, Saowaluk Inpaeng, Thanawee Chodjarusawad, Karaked Tedsree, Worawut Muangrat |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Hydrogen chemistry.chemical_element Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Nanomaterials law General Materials Science palladium nanoparticles Materials of engineering and construction. Mechanics of materials Spin coating Graphene Mechanical Engineering Palladium nanoparticles 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Mechanics of Materials TA401-492 hydrogen gas sensor graphene sheets 0210 nano-technology |
Zdroj: | Materials Science-Poland, Vol 38, Iss 2, Pp 305-311 (2020) |
Popis: | A room-temperature hydrogen gas (H2) sensor was successfully fabricated by dispersion of palladium nanoparticles (Pd NPs) on graphene sheets (GRs) (hereafter referred to as “Pd NPs/GRs”). GRs and Pd NPs were synthesized by chemical vapor deposition technique and by polyol process, respectively. A colloidal solution of Pd NPs with an average diameter of 11 nm was then dispersed onto the GRs by spin coating technique. The density of dispersed Pd NPs on GRs was controlled by varying the volume of the dispersed solution within the range of 50 – 150 μL. The fabricated Pd NPs/GRs sensors exhibited a high sensitivity for H2 gas with a concentration of 1500 – 6000 ppm at room temperature. Upon H2 exposure, the Pd NPs/GRs sensors showed an increase in electrical resistance, which could easily be measured. The relationship between sensor response and H2 concentration is in correspondence with the Langmuir adsorption model. The H2 detection limit is estimated to be 1 ppm. The results demonstrate that the Pd NPs/GRs sensor is an easily fabricated, but very effective means for room-temperature detection of H2at ppm level. |
Databáze: | OpenAIRE |
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