Zeng Cheng, Alsaiari Norah Salem, Saif Muhammad Jawwad, Junaid Dilshad M, Akhtar Tahir Mahmood, Isram Muhammad, Ali Adnan, Younus S, Alomayrah Norah, Al-Buriahi M S, Mahmood K, Ali M Yasir
International Institutes of Medicine, The Fourth Affiliated Hospital of Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China.
Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P .O. Box 84428, Riyadh, 11671, Saudi Arabia.
Heliyon. 2024 Aug 9;10(16):e36035. doi: 10.1016/j.heliyon.2024.e36035. eCollection 2024 Aug 30.
In this manuscript, we have investigated the dielectric and antibacterial potential of hydrothermally synthesized ZnMnO nanoparticles. The synthesized nanoparticles were annealed at various temperatures ranging from 450 to 650 °C with a step of 50 °C to modulate the structural, vibrational, dielectric, and antibacterial properties. XRD data confirmed the hexagonal structure of the synthesized samples and crystalline size was decreased to 4.8 nm at annealing temperature 600 °C. The lattice structure was further verified by Raman spectroscopy measurements, which strongly verified the XRD data due the presence of ZnMnO vibrational modes. The dielectric measurements revealed that the dielectric constant and los tangent were found to be increased with the increase annealing temperature and decreased with frequency, while a.c conductivity has an increasing trend with both parameters (temperature and frequency). The plot of real and complex parts of impedance against frequency demonstrated that both parameters decrease with the increased in frequency. But when we analyzed the behavior of the real part of impedance against the annealing temperature, a degradation in real part behavior is observed. The antibacterial activity of ZnMnO nanoparticles was determined by using the disc diffusion method against bacteria, which was grown on a Petri dish at room temperature for 24 h. This observation revealed that the samples annealed at 450 °C and 550 °C show remarkable antibacterial sensitivity as compared to other samples. It is concluded that crystalline size of 20 nm is found to be optimal value for good anti-baterial behavior.
在本论文中，我们研究了水热合成的ZnMnO纳米颗粒的介电性能和抗菌潜力。合成的纳米颗粒在450至650°C的不同温度下以50°C的步长进行退火，以调节其结构、振动、介电和抗菌性能。XRD数据证实了合成样品的六方结构，并且在600°C的退火温度下晶体尺寸减小到4.8nm。通过拉曼光谱测量进一步验证了晶格结构，由于存在ZnMnO振动模式，该测量有力地证实了XRD数据。介电测量表明，介电常数和损耗角正切随退火温度的升高而增加，随频率降低，而交流电导率随温度和频率这两个参数均呈增加趋势。阻抗实部和虚部随频率的变化曲线表明，这两个参数均随频率增加而降低。但是当我们分析阻抗实部随退火温度的变化行为时，观察到实部行为出现退化。通过纸片扩散法测定了ZnMnO纳米颗粒对在室温下于培养皿中培养24小时的细菌的抗菌活性。该观察结果表明，与其他样品相比，在450°C和550°C退火的样品表现出显著的抗菌敏感性。得出的结论是，发现20nm的晶体尺寸是良好抗菌行为的最佳值。
