Novel Mn3O4 Micro-octahedra: Promising Cataluminescence Sensing Material for Acetone

Two novel morphologies of Mn3O4 micro-octahedra and hexagonal nanoplates were controllably synthesized by hydrothermal treatment of KMnO4 in the dodecylamme-Na2SO3-ethanol/dodecylamine-ethanol system. XRD, SEM, HRTEM and N-2 adsorption measurements were used to characterize the prepared manganese oxide materials. With Mn3O4 micro-octahedra and hexagonal nanoplates as sensing materials, new acetone gas sensors were designed and their cataluminescence (CTL) property was evaluated. The effects of influencing parameters Oil the synthesis and sensing were studied Experimental results Show that the CTL properties of the prepared Mn3O4 materials are shape-dependent and Mn3O4 micro-octahedra show excellent sensing characteristics for acetone. Under the optimal experimental conditions, the calibration curve of the CTL intensity Versus acetone vapor concentration was linear in ranges of 2.6-52.2 and 52.2-394.0 mu g mL(-1), respectively, with a detection limit of 04 mu g mL(-1) (signal/noise = 3) and it relative standard deviation in the range of I to 3%. For long-term stability, the signal variation for acetone concentration at 47 mu g mL(-1) varied within +/- 11% in 6 months. The present sensor has a fast response time of 3 s and recovery time of less than 40 s.