Abstract
Hydrogen sulfide (H2S) sensing with ppb concentration detection limit and high selectivity is highly desired in future exhaled diagnoses of halitosis, asthma and down syndrome, however, needs further developing. Here, a ppb-concentration and highly selective H2S sensing has been developed with the two-dimensional cobalt and iron oxide nanosheets (CoFexOy NSTs), which is transformed from leaf-shaped zeolitic imidazolate frameworks {ZIF-L(Co)} by combined Fe2+ ion-etching and annealing. Typically, as-prepared CoFexOy NSTs are of ∼ 10 nm thick with rough surface. Beneficially, the CoFexOy NSTs present outstanding selectivity to H2S against other interfering gases and exhibit a detection limit as low as 50 ppb. Remarkably, the sensor prototypes exhibit high response to 10 ppm H2S (Ra/Rg = 23.8) and fast response speed (∼13 s to 10 ppm H2S). Theoretically, such excellent H2S sensing might be attributed to the high surface ratio of CoFexOy NSTs providing enriched adsorption sites for H2S molecules. Practically, a H2S sensing device built with the CoFexOy NSTs sensor prototype is simulated for detecting H2S with reliable response, which is potential in future intelligent healthcare.
Published Version
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