Scholarlink

<p>The quest for sustainable nanofabrication places green synthesis at the forefront of materials innovation. This work presents a novel, cactus plant extract-based route for depositing uniform nickel oxide (NiO) nanocoating on copper substrate via spin coating. Morphological characterization using scanning electron microscope (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) confirmed that bio-organic agents highlight the formation of spherical nanoparticles with an average grain size of 35&#xa0;nm and their elemental composition respectively. X-ray diffraction (XRD) analysis revealed the formation of face-centered cubic (fcc) crystalline phase of NiO, with average crystallites 13.5&#xa0;nm and 18&#xa0;nm calculated using Scherrer’s equation and Williamson-Hall(W–H) plot respectively. The W–H approach separated peak broadening contributions from size and strain, yielding a more accurate estimate of true crystallite size. Rietveld refinement was employed to achieve precise diffraction parameters. Dielectric measurements showed that the dielectric constant (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\epsilon\:}_{r}\)</EquationSource> </InlineEquation>) and loss tangent (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:\text{tan}\delta\:\)</EquationSource> </InlineEquation>) decreases sharply at low frequencies and tends to flat at high frequency. Optical analysis indicated a narrowed band gap of 3.31&#xa0;eV, while magnetic studies revealed a transition from weak ferromagnetism with exchange bias at 50&#xa0;K to superparamagnetic at 300&#xa0;K, driven by thermal fluctuations. These results establish a direct link between eco-friendly synthesis and tunable functional properties, positioning biosynthesized NiO as a promising candidate for next-generation optoelectronic and spintronic applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Tailoring the Optical and Magnetic Properties of Single Layered Nickel Oxide Nanocoating: A New Green Synthesis Approach

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月2日

查看全文
  • Y. T. Gebreslassie,
  • H. G. Gebretinsae,
  • Giday G. Welegergs,
  • M. G. Tsegay,
  • Z. Y. Nuru,
  • M. Maaza,
  • Pontsho Mbule,
  • Bakang M Mothudi

摘要

The quest for sustainable nanofabrication places green synthesis at the forefront of materials innovation. This work presents a novel, cactus plant extract-based route for depositing uniform nickel oxide (NiO) nanocoating on copper substrate via spin coating. Morphological characterization using scanning electron microscope (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) confirmed that bio-organic agents highlight the formation of spherical nanoparticles with an average grain size of 35 nm and their elemental composition respectively. X-ray diffraction (XRD) analysis revealed the formation of face-centered cubic (fcc) crystalline phase of NiO, with average crystallites 13.5 nm and 18 nm calculated using Scherrer’s equation and Williamson-Hall(W–H) plot respectively. The W–H approach separated peak broadening contributions from size and strain, yielding a more accurate estimate of true crystallite size. Rietveld refinement was employed to achieve precise diffraction parameters. Dielectric measurements showed that the dielectric constant ( \(\:{\epsilon\:}_{r}\) ) and loss tangent ( \(\:\text{tan}\delta\:\) ) decreases sharply at low frequencies and tends to flat at high frequency. Optical analysis indicated a narrowed band gap of 3.31 eV, while magnetic studies revealed a transition from weak ferromagnetism with exchange bias at 50 K to superparamagnetic at 300 K, driven by thermal fluctuations. These results establish a direct link between eco-friendly synthesis and tunable functional properties, positioning biosynthesized NiO as a promising candidate for next-generation optoelectronic and spintronic applications.