Synthesis of Cu_2O nanospheres and cubes: Their structural, optical and magnetic properties

摘要

In this work, synthesis strategy of Cu_2O nanosphere and cube was elucidated and the structural, optical and magnetic properties were studied. Cu_2O nanospheres and cubes were synthesized by wet chemical method through selecting the appropriate amount of isopropyl alcohol (IPA) with distilled water as solvent. 5% of IPA yielded cubic shape Cu_2O and 30% of IPA yielded spherical Cu_2O. The phase purity was confirmed with powder XRD. The FTIR result exhibit Cu(I)-O vibrational band around 628 cm~(-1) supports the XRD results. In Raman spectra weak band at 508 cm~(-1) corresponds to Raman allowed mode. The IR active bands at 110 and 150 cm~(-1) are observed because of the violation of selection rules which demonstrates the defects present in synthesized Cu_2O. Raman peaks at 218 and 415 cm~(-1) are assigned to multiphonon Raman scattering. The UVVis diffuse reflectance spectrum was recorded to calculate the band gap value. The band gap value calculated using Kubelka-Munk equation was 2.015 eV and 2.025 eV, respectively, for Cu_2O cube and nanosphere.