Department of Physics, Annamalai University, Annamalai Nagar -608002, Chidambaram, Tamil Nadu, India.
Department of Physics, Annamalai University, Annamalai Nagar -608002, Chidambaram, Tamil Nadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 15;305:123471. doi: 10.1016/j.saa.2023.123471. Epub 2023 Oct 6.
The present study describes the synthesis of pure and Cu doped α-FeOnanoparticles (with various concentrations of Copper 1, 3, 6, and 9 wt%) by conventional chemical precipitation technique and examines their structural, morphological, optical, magnetic, and antibacterial capabilities. The XRD pattern of pure and Cu-doped α-FeO nanoparticles exhibit rhombohedral structure and the estimated crystalline sizes were ranged from 39 to 58 nm. It is discovered that the estimated density dislocations linked to the agglomeration/cluster formations diminish when interstitial vacancies are filled with copper. The obtained bandgap from Tauc's plot, 2.07 eV of pure α-FeO is found to less than Cu doped α-FeO nanoparticles (2.9-3.4 eV), due to the structural changes and the tailing of localised states into deep bandgap energy levels. The intense blue emission bands (410-490 nm) arised due to the movement of trapped electrons from the donor level to the valance band and broad green emission bands (522-560 nm) are due to deep level CuO defect to the FeO. The fundamental stretching of Fe-O vibrations and the presence of Cu in prepared samples were identified in FTIR and Raman spectra. SEM micrograph shows the uniform distribution of spherical nanoparticles with size ranged from 39 to 61 nm, which is in good accord with XRD studies. Further, the magnetic characteristics of the pure and Cu-doped α-FeO samples were assessed using a vibrating sample magnetometer (VSM); the ensuing hysteresis loop of the Cu-doped α-FeO displays weaker ferromagnetic behaviour. In the present investigations, the disc diffusion technique has been used to examine the antibacterial activity. Thus, the results of antibacterial activities demonstrated that at concentrations of 200 and 500 μg/ml of pure and Cu-doped α-FeO NPs, the highest zone of inhibition was found against gram (+ve) positive bacteria and was followed by the gram (-ve) negative bacteria's.
本研究通过传统的化学沉淀技术描述了纯和 Cu 掺杂的α-FeOnanoparticles（具有不同浓度的铜 1、3、6 和 9 wt%）的合成，并研究了它们的结构、形态、光学、磁性和抗菌性能。纯和 Cu 掺杂的α-FeO 纳米粒子的 XRD 图谱呈现出菱面体结构，估计的结晶尺寸范围在 39 到 58nm 之间。研究发现，当间隙空位被铜填充时，与团聚/团簇形成相关的估计密度位错减少。从 Tauc 图得到的纯α-FeO 的带隙为 2.07eV，发现低于 Cu 掺杂的α-FeO 纳米粒子（2.9-3.4eV），这是由于结构变化和局域态向深能带能级的尾部。强烈的蓝发射带（410-490nm）是由于被俘获电子从施主能级到价带的运动而产生的，宽的绿发射带（522-560nm）是由于深能级 CuO 缺陷到 FeO。在 FTIR 和拉曼光谱中，确定了制备样品中 Fe-O 振动的基本伸缩和 Cu 的存在。SEM 显微照片显示，球形纳米粒子的均匀分布，尺寸范围在 39 到 61nm 之间，这与 XRD 研究很好地一致。此外，使用振动样品磁强计（VSM）评估了纯和 Cu 掺杂的α-FeO 样品的磁性特性；Cu 掺杂的α-FeO 的滞后回线显示出较弱的铁磁性行为。在目前的研究中，使用圆盘扩散技术研究了抗菌活性。因此，抗菌活性的结果表明，在纯和 Cu 掺杂的α-FeO NPs 的浓度为 200 和 500μg/ml 时，对革兰氏阳性菌的抑制带最高，其次是革兰氏阴性菌。
