Co(Ⅲ) doped-CoFe layered double hydroxide growth with graphene oxide as cataluminescence catalyst for detection of carbon monoxide

Abstract

In this work, the hybridization of Co(Ⅲ) doped-CoFe layered double hydroxide and graphene oxide (CoFe LDH/GO) was first employed as catalyst to establish a cataluminescence (CTL) gas sensor for detection of carbon monoxide. In order to obtain Co(Ⅲ) doped-CoFe LDH/GO with the best CTL performance, synthesis reaction parameters including amount of oxidant, oxidation time and amount of GO were studied. The structure and morphology of Co(Ⅲ) doped-CoFe LDH/GO were characterized. The Co(Ш) doped-CoFe LDH/GO based CTL sensor enabled the selective determination of carbon monoxide with signal response of 0.5 s and restores of 1.0 s. The RSD was 5.6% and CTL intensity remained stable within 10 days. The calibration curve of carbon monoxide is linear in concentration range of 0.01–20 mg/L and the limit of detection(LOD）is 0.002 mg/L. Comparing with the reported CTL sensor, the Co(Ш) doped-CoFe LDH/GO based CTL sensor shows wide linear range, low LOD and use little assistive technology. Carbon monoxide in automobile exhaust was quantified with recoveries of 92.0% to 108.0%. The analytical results were agreed well with gas chromatography method. This work designed high performance catalytic materials for CTL detection of carbon monoxide.