In the present investigation, pure MnO 2 and Cu doped MnO 2 (Cu:MnO 2 ) thin films were successfully prepared by the spray pyrolysis deposition technique. Different Cu concentrations were used to analyze the morphological, structural, optical, electrical properties and as well glucose sensitivity measurement has been performed. MnO 2 doped with Cu induces microstructure and is set in the lattice by keeping Mn +2 leading to the micro spherical shape of the samples highlighted from a scanning electron microscope. X-ray diffraction analysis has confirmed the tetragonal MnO 2 crystal structure with α-phase. The crystallite size, crystal structure, texture, and nanoparticle formation in MnO 2 films have been influenced by Cu dopant. The maximum optical transmittance is found to be about 83%. The energy band gap associated with the allowed direct transition is found to increase from 3.82 to 3.96 eV with increasing Cu doping concentration up to 4 at%. Glucose sensitivity was measured by the four-probe technique. Notably, 4 at% Cu:MnO 2 films have demonstrated the superior sensing ability of glucose of 29%.
Iron (Fe), a magnetic transition metal, doped manganese oxide (MnO2) nanostructured thin films were deposited onto glass substrates by a spray pyrolysis deposition technique at 450oC substrate temperature for glucose sensing performance. Fe concentration greatly affects the film surface morphology. The film was found to be more compact and porous for 4 at % Fe doping. The glucose response was measured by electrical four probe method using the pure MnO2 and 2, 4, 6, 8 at% Fe doped MnO2 thin films as an active electrode. It was determined that 4 at % Fe: MnO2 thin film with 20 nm crystallite size has high sensitivity, fast glucose response and recovery time. Optical band gap measurement indicated that the sensitivity increased as the band gap decreased up to 4 at% Fe concentration. The highest glucose sensing response was recorded about 29 % in 5 minutes.
Bangladesh Journal of Physics, 27(1), 1-12, June 2020
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