Synthesis, characterization and humidity sensing properties of Mn0.2Ni0.8Fe2O4 nanoparticles

► Mn0.2Ni0.8Fe2O4 nanoparticles were synthesized by PEG assisted hydrothermal technique. ► XRD and FT-IR analysis confirm the composition and structure of the particles as spinel ferrite. ► The sensor is highly sensitive to humidity but weakly sensitive for the other test vapors and gases.