Microplotter Printing of Co3O4 Films as Receptor Component of Hydrogen Sulfide-Sensitive Gas Sensors

A hierarchically organized Co3O4 nanopowder was obtained via programmed chemical precipitation, exhibiting several levels of microstructural self-organization: the initial particles are 40 ± 5 nm in size (average CSR is 32 3 nm), have a somewhat distorted rounded shape and combined into curved chains, which, turn, form flat agglomerates approximately 350 50 diameter. The thermal behavior semiproduct (β-Co(OH)2) studied by means synchronous analysis (TGA/DSC). powders were examined X-ray diffraction (XRD) Fourier-transform infrared spectroscopy (FTIR). Nanopowder cobalt(II,III) oxide employed as functional ink component for microplotter printing corresponding film on chip surface, preservation material’s crystal structure confirmed XRD Raman (RS). features resulting analyzed scanning electron microscopy (SEM) atomic force (AFM). Kelvin probe (KPFM) utilized to estimate work function material capacitance (SCM) data indicated intergranular conductivity type. results conducted chemosensor measurements demonstrate that printed exhibits hydrogen sulfide selectivity rather high sensory response (S = 131% 100 ppm) this analyte at an operating temperature 250 °C. dependence sensor value time when detecting H2S concentration range 4–200 ppm determined reproducibility signal demonstrated.