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<p>Nickel–zinc chromite nanocomposites (Ni<sub>x</sub> Zn <sub>(1−x)</sub> Cr<sub>2</sub>O<sub>4</sub>; x = 0.025, 0.050, 0.075) were synthesized via sol–gel auto-combustion using citric acid. The structural analysis indicated the presence of cubic spinel structure with reduction of crystallite sizes (34&#xa0;nm (NZC1) to 31&#xa0;nm (NZC3) for Ni blended samples due to induced lattice strain. Lattice parameters varied from 573.23 to 577.38 Aº with dislocation densities of 0.8650–1.0405&#xa0;nm⁻². Fourier infra-red (FTIR) analysis revealed characteristic tetrahedral (640–648&#xa0;cm⁻¹) and octahedral (438–457&#xa0;cm⁻¹) M–O functional groups with stretching modes. Morphological analyses showed spherical, agglomerated nanoparticles (size ~ 39&#xa0;nm) like morphology. Further X-Ray Photo Electron Spectroscopy (XPS) indicates existence of Ni²⁺, Zn²⁺ and Cr³⁺ oxidation states in the sample. UV-DRS demonstrated bandgap tunability (2.78&#xa0;eV in NZC1 to 2.95&#xa0;eV in NZC3). NZC1 sample exhibited exceptional photocatalytic degradation of methylene blue (97% in 70&#xa0;min under sunlight), attributed to optimal bandgap, enhanced charge mobility, and reduced recombination. Antibacterial assays showed significant inhibition zones: 11&#xa0;mm against <i>Bacillus subtilis</i> and 7&#xa0;mm against <i>Escherichia coli</i>. Cytotoxicity against MCF-7 (IC₅₀ = 39.01&#xa0;µg/ mL) and HeLa (IC₅₀ = 63.61&#xa0;µg/ mL) cell lines confirmed potent anticancer activity via ROS generation. These results position Ni–Zn chromite nanocomposites as highly efficient, multifunctional materials for photo catalysis, antimicrobial coatings, and cancer therapy.</p>

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Composition-dependent functionalities of Nix Zn (1−x) Cr2O4 nanostructures for biomedical and photocatalytic applications

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • A Ajith,
  • G Suresh,
  • B Saravanakumar,
  • L Chitra

摘要

Nickel–zinc chromite nanocomposites (Nix Zn (1−x) Cr2O4; x = 0.025, 0.050, 0.075) were synthesized via sol–gel auto-combustion using citric acid. The structural analysis indicated the presence of cubic spinel structure with reduction of crystallite sizes (34 nm (NZC1) to 31 nm (NZC3) for Ni blended samples due to induced lattice strain. Lattice parameters varied from 573.23 to 577.38 Aº with dislocation densities of 0.8650–1.0405 nm⁻². Fourier infra-red (FTIR) analysis revealed characteristic tetrahedral (640–648 cm⁻¹) and octahedral (438–457 cm⁻¹) M–O functional groups with stretching modes. Morphological analyses showed spherical, agglomerated nanoparticles (size ~ 39 nm) like morphology. Further X-Ray Photo Electron Spectroscopy (XPS) indicates existence of Ni²⁺, Zn²⁺ and Cr³⁺ oxidation states in the sample. UV-DRS demonstrated bandgap tunability (2.78 eV in NZC1 to 2.95 eV in NZC3). NZC1 sample exhibited exceptional photocatalytic degradation of methylene blue (97% in 70 min under sunlight), attributed to optimal bandgap, enhanced charge mobility, and reduced recombination. Antibacterial assays showed significant inhibition zones: 11 mm against Bacillus subtilis and 7 mm against Escherichia coli. Cytotoxicity against MCF-7 (IC₅₀ = 39.01 µg/ mL) and HeLa (IC₅₀ = 63.61 µg/ mL) cell lines confirmed potent anticancer activity via ROS generation. These results position Ni–Zn chromite nanocomposites as highly efficient, multifunctional materials for photo catalysis, antimicrobial coatings, and cancer therapy.