Hydrogen Sensors Based on MoS<sub>2</sub> Hollow Architectures Assembled by Pickering Emulsion.
basic_science · Level V
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- Record sourced from PubMed, PMID 32700897.
- Also identified by DOI 10.1021/acsnano.0c00821.
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Abstract
For rapid hydrogen gas (H<sub>2</sub>) sensing, we propose the facile synthesis of the hollow structure of Pt-decorated molybdenum disulfide (h-MoS<sub>2</sub>/Pt) using ultrathin (mono- or few-layer) two-dimensional nanosheets. The controlled amphiphilic nature of MoS<sub>2</sub> surface produces ultrathin MoS<sub>2</sub> NS-covered polystyrene particles <i>via</i> one-step Pickering emulsification. The incorporation of Pt nanoparticles (NPs) on the MoS<sub>2</sub>, followed by pyrolysis, generates the highly porous h-MoS<sub>2</sub>/Pt. This hollow hybrid structure produces sufficiently permeable pathways for H<sub>2</sub> and maximizes the active sites of MoS<sub>2</sub>, while the Pt NPs on the hollow MoS<sub>2</sub> induce catalytic H<sub>2</sub> spillover during H<sub>2</sub> sensing. The h-MoS<sub>2</sub>/Pt-based chemiresistors show sensitive H<sub>2</sub> sensing performances with fast sensing speed (response, 8.1 s for 1% of H<sub>2</sub> and 2.7 s for 4%; and recovery, 16.0 s for both 1% and 4% H<sub>2</sub> at room temperature in the air). These results mark the highest H<sub>2</sub> sensing speed among 2D material-based H<sub>2</sub> sensors operated at room temperature in air. Our fabrication method of h-MoS<sub>2</sub>/Pt structure through Pickering emulsion provides a versatile platform applicable to various 2D material-based hollow structures and facilitates their use in other applications involving surface reactions.