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<p>This study proposes a precursor-dependent approach to modulate crystallinity, optical properties, and surface charge characteristics of ZnO nanostructures fabricated through microwave-assisted decomposition of zinc acetate. The various durations of exposure to microwave irradiation allowed for studying different intermediate phases. The structural analysis revealed an alteration in the crystalline structure, accompanied by modifications in lattice strain and dislocation density. Optical characteristics demonstrated a tunable bandgap from 3.17 to 2.52&#xa0;eV with increasing irradiation heating, corresponding to photoluminescence confirming transitions from defect-related sub-bandgap states and a prolonged phosphorescence lifetime. Surface charge studies revealed a significant enhancement in negative zeta potential. These findings demonstrate the efficiency of microwave-assisted precursor control as a practical approach for tailoring the functional properties of ZnO, thereby contributing significantly to optoelectronic, photocatalytic, and environmental education.</p>

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Precursor-dependent crystallinity and surface charge modulation of ZnO nanostructures via microwave-assisted synthesis

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Samor Boonphan,
  • Suriyong Prachakiew,
  • Yanee Keereeta,
  • Arrak Klinbumrung

摘要

This study proposes a precursor-dependent approach to modulate crystallinity, optical properties, and surface charge characteristics of ZnO nanostructures fabricated through microwave-assisted decomposition of zinc acetate. The various durations of exposure to microwave irradiation allowed for studying different intermediate phases. The structural analysis revealed an alteration in the crystalline structure, accompanied by modifications in lattice strain and dislocation density. Optical characteristics demonstrated a tunable bandgap from 3.17 to 2.52 eV with increasing irradiation heating, corresponding to photoluminescence confirming transitions from defect-related sub-bandgap states and a prolonged phosphorescence lifetime. Surface charge studies revealed a significant enhancement in negative zeta potential. These findings demonstrate the efficiency of microwave-assisted precursor control as a practical approach for tailoring the functional properties of ZnO, thereby contributing significantly to optoelectronic, photocatalytic, and environmental education.