Mechanistic insight into high response of carbon monoxide gas sensor developed by nickel manganate nanorod decorated reduced graphene oxide

Publication date: Available online 10 January 2020Source: Colloids and Surfaces A: Physicochemical and Engineering AspectsAuthor(s): Debabrata Nandi, Jyotishkumar Parameswaranpillai, Suchart SiengchinAbstractNickel manganate nanorod (NNM) decorated reduced graphene oxide (NNMG) was developed and its structure-property correlations in light of X-ray diffraction (XRD), Raman, field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) were evaluated. The starring role of NNM and reduced graphene oxide (RGO) in NNMG for CO sensing was explored and an insight into the mechanistic pathway of sensing was proposed. NNMG displayed an excellent response % (∼ 7000) and sensitivity (0.60 ppm-1), which can surpass most stable efficient sensors, indicative of the synergistic effect of RGO and NNM. Moreover, NNMG can competently sense CO gas at wide range of concentration (25 - 200 ppm) with good stability and reversibility. Ligand like approach of CO facilitated donation of electron to the lattice oxygen vacancy and subsequently decrease electron barrier at the Schottky junction, resulting the higher conductive response. The obtained outcomes demonstrated that the rational design of nanorod decorated RGO could be a promising strategy to improve CO sensing performance.Graphical abstract
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research