Maxwell-Boltzmann statistics to elucidate the luminescent emission bands in Co(OH)2 and Co3O4 nanocrystals

Abstract

Here we synthesized the Co3O4 and Co(OH)2 nanocrystals using Chemical Bath Deposition technique. We discuss the Fluorescence dependence with the trap density and surface recombination velocity to the light of the Maxwell-Boltzmann theoretical results obtained through the characterization by techniques: X-ray Diffraction (XRD), Absorbance, Raman spectroscopy, and Fluorescence. The XRD show hexagonal β-Co(OH)2 and Co3O4 cubic phase, grain sizes of ∼18.60 nm and ∼19.06 nm, respectively. The Co(OH)2 absorbance shows band at ∼569 nm and at ∼286 nm and ∼377 nm. The Co(OH)2 shows electronic transitions at ∼1.51 eV and ∼2.07 eV assigned to O2−→Co2+ and O2−→Co3+ charge transfer processes. The Co3O4 and Co3O4 have modes. Raman of Co(OH)2 shows active Raman modes. The Fluorescence spectrum of Co3O4 shows peaks at range∼470−573 nm. Co(OH)2 exhibited twelve emission bands in the UV–vis region at range ∼460−660 nm.