Spinel MgFe2O4 thick films: A colloidal approach for developing gas sensors

We report a facile synthesis of spinel MgFe2O4 thick films and their use as gas sensors via sol-gel process. The choice of reductant (citrate) in combination with oxidizers (metal nitrates) led to exothermic self-sustaining anionic redox reaction of xerogel. Gas sensing properties are described using an interplay of interfacial colloidal chemistry, structural and morphological properties of the developed material. (C) 2017 Elsevier B.V. All rights reserved.