Fabrication and characterization of SnO2 and SnS2 nanobiosensor in the Presence of Aspergillus Niger Fungi

In this paper, SnO2 and SnS2 thin films were synthesized by spray pyrolysis method on glass substrate. The synthesized films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Aspergillus Niger (A. Niger) fungi were grown in an appropriate medium and were exposed to the synthesized SnO2 and SnS2 thin films in a closed glass vessel to measure their nano-biosensing properties. The nano-biosensitivity of the prepared samples was investigated by studying the change in their electrical resistance at different times and temperatures happening due to the produced gases from A. niger fungi. Furthermore, the effects of humidity and CO2 on the sensitivity of the samples were investigated in the presence of Silica-gel and CaCo3, respectively. The results showed a considerable and detectable electrical resistance change for prepared samples in the presence of A. niger fungi, which supports our proposed system as a nanobiosensor.