Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 329, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129194
Keywords
Hydrogen sensor; Low detection limit; Pd nanoparticle; Ni foam
Funding
- National Key Research and Development Program of China [2016YFB0501303]
- foundation of the National Key Laboratory of Science and Technology on Vacuum Technology and Physics [ZWK1701]
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A novel hydrogen sensor with ppb-level detection limit was fabricated using oxidized Ni foam as substrate and Pd nanoparticles as sensing material. The sensor showed high response and stability to low concentration H2, with a wide detection range (7 ppb to 2 %) and optimal operating temperature of 30 degrees C. This work provides a new strategy for the development of low detection limit hydrogen sensors.
A novel hydrogen sensor with ppb-level detection limit was fabricated in this work. The oxidized Ni foam was chosen as the substrate, whose 3D porous structure contributed to gas circulation, and insulating NiO nano-wrinkles provided a large specific surface area. Pd nanoparticles as hydrogen sensing material were loaded on it by magnetron sputtering. Unprecedentedly, the incompletely reversible lattice distortion caused by the generation of Pd-H beta-phase was applied to activate the hydrogen sensor, which significantly improved the response to low concentration H-2. The activation mechanism was proposed firstly and analyzed innovatively. Therefore, hydrogen with a large concentration range (7 ppb similar to 2 %) can be detected by the prepared sensor, and the response changes regularly as H-2 concentration changes. The optimum temperature of the sensor is 30 degrees C, and it exhibits high cycling stability, humidity stability and gas selectivity. This work provides a brand new strategy for the development of low detection limit hydrogen sensors.
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