Structural, optical and electrical properties of Cu:MnO2 nanostructured thin films for glucose sensitivity measurements

Abstract

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%.

Formation of inorganic liquid gallium particle–manganese oxide composites

“…56,57 MnO 2 peaks at 32.9°, 39.6°, 43.9° and 49.9° were also detected which could possibly indicate turbostratic MnO 2 crystals within the liquid Ga/Mn oxide composites. 54,58–61…”

“…56,57 MnO 2 peaks at 32.9°, 39.6°, 43.9°and 49.9°were also detected which could possibly indicate turbostratic MnO 2 crystals within the liquid Ga/Mn oxide composites. 54,[58][59][60][61] XPS surveys were conducted to acquire the chemical bonding information across the liquid Ga/Mn oxide composites. The Ga 2p, Mn 2p and O 1s high-resolution spectra of the unannealed liquid Ga/Mn oxide composites are presented in Fig.…”

α-MnO2 Nanowire Structure Obtained at Low Temperature with Aspects in Environmental Remediation and Sustainable Energy Applications

“…Notable variations in the bandgap energies of α-MnO 2 were previously observed. For example, Zahan et al noticed a bandgap of 3.82 eV in α-MnO 2 thin films[49]. The shift in the bandgap to higher energies can be attributed to the carrier confinement in the small semiconductor particles.…”

Self-Assembly of Copper Oxide Interfaced MnO2 for Oxygen Evolution Reaction

“…However, after incorporating MnO 2 , the supplementary diffraction heights detected at 2θ estimates of 12.7°, 15.6°, 18.0°, 37.6°, 40.6°, 42.0°, 49.9°, and 60.2° were, respectively credited to the (110), (001), (200), (121), (111) (301), (411), and (521) planes of the MnO 2 component (JCPDS card no. 72-1982 and 80-1098), which is crystalline [ 32 , 33 ]. The surface areas (BET) and pore size distribution (BJH) parameters were studied using N 2 adsorption−desorption isotherms as displayed in Figure 2 , which demonstrated a characteristic IV isotherm that was ascribed to the mesoporous architecture of the aggregated CuO sphere, as displayed in Figure 2 b.…”