Temperature-Dependent Optical Properties of Nickel Oxide Nanostructures Prepared by Thermal Oxidation/Limited Fusion
DOI:
https://doi.org/10.2025/sqn91w09Abstract
This research letter explores how temperature shapes the optical properties of the nanostructured nickel oxide (NiO) layers grown on nickel substrates through thermal oxidation at 300°C, 500°C, and 700°C, showing that higher processing temperatures boost absorbance and cause a clear, stepwise red-shift in the absorption edge. Tauc plot analysis bears this out quantitatively, revealing a narrowing of the indirect band gap from 3.85 eV down to 3.58 eV as the temperature climbs. Such trend is driven by better crystallinity, larger grains, and a relaxation of quantum confinement. Altogether, these findings highlight temperature as a precise tuning knob for NiO electronic structure, opening the door to tailored designs for gas sensors and various optoelectronic devices.
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