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<p>In recent decades, scientists have been tailoring desirable nanostructure to unveil the potential of nanomaterials (NMs) in biomedical, energy, and environmental applications. This research discussed novel synthesis of chromium oxide (Cr<sub>2</sub>O<sub>3</sub>) nanoparticles (NPs), studied the impact of sintering at different temperatures and evaluated its magnetic and bactericidal properties. However, synthesized material initially confirmed by the colour of precipitate and then characterizes X-ray diffraction (XRD) which represents highly crystalline structure without any traces of impurities. Cr<sub>2</sub>O<sub>3</sub> NPs has shown rhombohedral phase with average crystallite sizes that increases from 31.5 to 47.70&#xa0;nm on increasing the temperature from 500 to 800&#xa0;°C respectively. Furthermore, FE-SEM and TEM recorded of prepared samples which confirm the spherical shape at 500&#xa0;°C. However, with the increasing sintering temperature up to 800&#xa0;°C, the size and morphology turned into pentagonal and hexagonal shape. Similarly, the coercivity and retentivity of Cr<sub>2</sub>O<sub>3</sub> NPs are calculated decreasing order 0.6784 Oe, 0.6579 Oe, 0.478 Oe, 0.4022 Oe and 1.5065 × 10<sup>–3</sup>&#xa0;emu/g, 1.4290 × 10<sup>–3</sup>&#xa0;emu/g, 1.3967 × 10<sup>–3</sup>&#xa0;emu/g, 0.9638 × 10<sup>–3</sup>&#xa0;emu/g with increasing the sintering temperature respectively. This signify that increase the sintering temperatures paramagnetic property of Cr<sub>2</sub>O<sub>3</sub> NPs transform into anti-ferromagnetic nature, which might be associated with induced exchange interaction of oxygen defects. The potential antibacterial efficacy was tested against <i>Escherichia coli</i> (Gram-negative), <i>Klebsiella pneumonia</i> (Gram-negative), and <i>Salmonella typhi</i> (Gram-negative). Optimized better MIC (minimum inhibition concentration) was observed for sintered at 500&#xa0;°C as <i>S. typhi</i> (0.68&#xa0;mg/ml), <i>K. pneumoniae</i> (0.387&#xa0;mg/ml), and <i>E. coli</i> (0.532&#xa0;mg/ml), and better results were found for Cr<sub>2</sub>O<sub>3</sub> NPs. The present study entails Cr<sub>2</sub>O<sub>3</sub> NPs can be used to develop potential antibacterial agent for effective treatment of antibiotic-resistant bacteria, and cure for previously incurable diseases.</p> Graphical Abstract <p></p>

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Synthesis of Chromium Oxide Nanoparticles and Tuning to Optimize Magnetic and Bactericidal Properties

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Pratham Singh,
  • Balak Das,
  • Saket Jha,
  • Chia-Jyi Liu,
  • Ram Raseele Awasthi,
  • Ajay Kumar Tiwari,
  • Sharad Kumar Tripathi,
  • Abhishek Kumar Bhardwaj,
  • Vivek Kumar Nautiyal

摘要

In recent decades, scientists have been tailoring desirable nanostructure to unveil the potential of nanomaterials (NMs) in biomedical, energy, and environmental applications. This research discussed novel synthesis of chromium oxide (Cr2O3) nanoparticles (NPs), studied the impact of sintering at different temperatures and evaluated its magnetic and bactericidal properties. However, synthesized material initially confirmed by the colour of precipitate and then characterizes X-ray diffraction (XRD) which represents highly crystalline structure without any traces of impurities. Cr2O3 NPs has shown rhombohedral phase with average crystallite sizes that increases from 31.5 to 47.70 nm on increasing the temperature from 500 to 800 °C respectively. Furthermore, FE-SEM and TEM recorded of prepared samples which confirm the spherical shape at 500 °C. However, with the increasing sintering temperature up to 800 °C, the size and morphology turned into pentagonal and hexagonal shape. Similarly, the coercivity and retentivity of Cr2O3 NPs are calculated decreasing order 0.6784 Oe, 0.6579 Oe, 0.478 Oe, 0.4022 Oe and 1.5065 × 10–3 emu/g, 1.4290 × 10–3 emu/g, 1.3967 × 10–3 emu/g, 0.9638 × 10–3 emu/g with increasing the sintering temperature respectively. This signify that increase the sintering temperatures paramagnetic property of Cr2O3 NPs transform into anti-ferromagnetic nature, which might be associated with induced exchange interaction of oxygen defects. The potential antibacterial efficacy was tested against Escherichia coli (Gram-negative), Klebsiella pneumonia (Gram-negative), and Salmonella typhi (Gram-negative). Optimized better MIC (minimum inhibition concentration) was observed for sintered at 500 °C as S. typhi (0.68 mg/ml), K. pneumoniae (0.387 mg/ml), and E. coli (0.532 mg/ml), and better results were found for Cr2O3 NPs. The present study entails Cr2O3 NPs can be used to develop potential antibacterial agent for effective treatment of antibiotic-resistant bacteria, and cure for previously incurable diseases.

Graphical Abstract