Scholarlink

Abstract <p>Controlled doping is the paradigmatic approach for improving the properties of any pristine material. Ni<sub><i>x</i></sub>Mn<sub>1–<i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0, 0.01, 0.03, 0.05, 1) were synthesized by the facile sol–gel auto combustion method. The as-prepared samples were further annealed. Formation of impurity levels, structural, morphological, vibrational, optical and electronic variations as a result of Nickel doping is systematically analyzed by structural and optical studies. The average crystallite size shows decremental trend for pre annealed and an incremental trend for annealed samples. Increased particle agglomeration can be seen in SEM micrographs. EDAX confirms the compositional variation of Nickel from 1 to 5%. FTIR and Raman spectra represent band shifting towards higher wavenumber and Raman peak broadening with Nickel substitution. Optical analyses suggests that MnFe<sub>2</sub>O<sub>4</sub> which has optical bandgap of ~2.2 eV is reduced to ~1.7 eV (pre annealed) and ~1.4 eV (annealed) and thus can be made as a photo catalyst material. Photoluminescence spectra of pre- and post-annealed samples show presence of peak in visible region with a red shift in PL spectra indicating band narrowing.</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

Optical Bandgap Tuning of Manganese Ferrite by Nickel Doping and Heat Treatment

  • 期刊论文

  • 发表日期：

    2025年7月2日

查看全文
  • Anum Mohammedi,
  • V. M. Jali

摘要

Abstract

Controlled doping is the paradigmatic approach for improving the properties of any pristine material. NixMn1–xFe2O4 (x = 0, 0.01, 0.03, 0.05, 1) were synthesized by the facile sol–gel auto combustion method. The as-prepared samples were further annealed. Formation of impurity levels, structural, morphological, vibrational, optical and electronic variations as a result of Nickel doping is systematically analyzed by structural and optical studies. The average crystallite size shows decremental trend for pre annealed and an incremental trend for annealed samples. Increased particle agglomeration can be seen in SEM micrographs. EDAX confirms the compositional variation of Nickel from 1 to 5%. FTIR and Raman spectra represent band shifting towards higher wavenumber and Raman peak broadening with Nickel substitution. Optical analyses suggests that MnFe2O4 which has optical bandgap of ~2.2 eV is reduced to ~1.7 eV (pre annealed) and ~1.4 eV (annealed) and thus can be made as a photo catalyst material. Photoluminescence spectra of pre- and post-annealed samples show presence of peak in visible region with a red shift in PL spectra indicating band narrowing.