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<p>Cobalt (II) oxide nanoparticles were synthesized through -D-glucose-assisted chemical reduction method. The sample was annealed at 600&#xa0;°C for 4&#xa0;h to facilitate proper crystallization. The crystallographic characteristics were studied using X-ray diffraction pattern analysis. The crystallographic plane reflections analogous to the formation of hexagonal primitive lattice of CoO under the space group <i>P6 3 mc (186)</i> was observed. The crystallite size (31&#xa0;nm) was estimated using Moshi-Scherrer equation. The microstrain (0.0023 Nm<sup>−2</sup>) separated error minimized crystallite size (39&#xa0;nm) was evaluated using Halder-Wagner method. The imperfections in the lattice were measured through dislocation density (6.6 × 10<sup>–4</sup>&#xa0;nm<sup>−2</sup>) and stacking fraction. The band gap (1.66&#xa0;eV) corresponding to direct allowed band-to-band transition was calculated from Tauc’ plot analysis using UV–Visible reflection data employing Kubelka–Munk function. The luminescence peaks measured using sophisticated fluorescence spectrometer were observed in the visible region corresponding to an excitation wavelength at 441&#xa0;nm. The distinct emissions involving band-to-band transition states were found responsible for the chromaticity effects. The CIE chromaticity diagram provide photometric properties like chromaticity coordinates (<i>x</i> = 0.241; <i>y</i> = 0.433), correlated color temperature (CCT (K) = 8551.7) and color purity (44%). The utility of the studied sample as a cool light source and the efficacy for fabricating heterogeneous photocatalysts and electroluminescent device structures are discussed.</p>

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-D-glucose-assisted synthesis, lattice structure analysis and cool light emission characteristics of CoO nanoparticles

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • K. H. Praveen,
  • Arun S. Prasad

摘要

Cobalt (II) oxide nanoparticles were synthesized through -D-glucose-assisted chemical reduction method. The sample was annealed at 600 °C for 4 h to facilitate proper crystallization. The crystallographic characteristics were studied using X-ray diffraction pattern analysis. The crystallographic plane reflections analogous to the formation of hexagonal primitive lattice of CoO under the space group P6 3 mc (186) was observed. The crystallite size (31 nm) was estimated using Moshi-Scherrer equation. The microstrain (0.0023 Nm−2) separated error minimized crystallite size (39 nm) was evaluated using Halder-Wagner method. The imperfections in the lattice were measured through dislocation density (6.6 × 10–4 nm−2) and stacking fraction. The band gap (1.66 eV) corresponding to direct allowed band-to-band transition was calculated from Tauc’ plot analysis using UV–Visible reflection data employing Kubelka–Munk function. The luminescence peaks measured using sophisticated fluorescence spectrometer were observed in the visible region corresponding to an excitation wavelength at 441 nm. The distinct emissions involving band-to-band transition states were found responsible for the chromaticity effects. The CIE chromaticity diagram provide photometric properties like chromaticity coordinates (x = 0.241; y = 0.433), correlated color temperature (CCT (K) = 8551.7) and color purity (44%). The utility of the studied sample as a cool light source and the efficacy for fabricating heterogeneous photocatalysts and electroluminescent device structures are discussed.