Structural, optical and magnetic properties of CuO/α-Fe2O3 nanocomposites: effect of Fe concentration and annealing temperature

IF 4.1 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nanoscale Research Letters Pub Date : 2025-03-09 DOI:10.1186/s11671-025-04222-w

B. Sahu, U. K. Panigrahi, Debashree Nayak, Shamima Hussain, P. Mallick

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Abstract

The impact of annealing temperature (500, 600, and 700 °C) and Fe concentration on the formation of 5, 10 and 20 at.% Fe-doped CuO was investigated using structural, optical, and magnetic characterizations. XRD and Raman studies confirmed the presence of both CuO and α-Fe₂O₃ in the composite samples. The broadening of the multiphoton transition mode in the Raman spectra with increasing Fe concentration and annealing temperature could be associated with the defects. FESEM analysis showed that the sample’s morphology changed from non-homogeneous, irregularly shaped flake-like particles to nearly spherical particles with increased Fe concentration. Optical characterization suggested that the samples’ higher optical band gap energy (> 3 eV) could result from the quantum confinement effect. Photoluminescence analysis revealed that the rise of annealing temperature from 500 to 600 °C led to a shift in the emission coordinates from the near-green to the blue region. All the samples showed a clear hysteresis loop at room temperature indicating the ferromagnetic nature. The maximum coercivity of 777 Oe and highest remanent magnetization of 2.06 emu/g was found for the 20% Fe-doped CuO annealed at 700 °C. On the other hand, the 5% Fe-doped CuO samples exhibited an exchange bias field of ~ 31 Oe at 300 K.

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CuO/α-Fe2O3纳米复合材料的结构、光学和磁性能：铁浓度和退火温度的影响

研究了退火温度（500、600和700℃）和Fe浓度对5、10和20 at形成的影响。利用结构、光学和磁性表征对掺铁氧化铜进行了研究。XRD和Raman研究证实复合样品中同时存在CuO和α-Fe2O3。随着铁浓度和退火温度的增加，拉曼光谱中多光子跃迁模式的展宽可能与缺陷有关。FESEM分析表明，随着铁浓度的增加，样品的形貌由不均匀、形状不规则的片状颗粒变为接近球形的颗粒。光学表征表明，样品较高的光学带隙能量（> 3ev）可能是由量子约束效应引起的。光致发光分析表明，退火温度从500°C上升到600°C，导致发射坐标从近绿色区域向蓝色区域移动。所有样品在室温下均表现出明显的磁滞回线，表明其铁磁性。在700℃退火条件下，掺铁20%的CuO的矫顽力最大为777 Oe，剩余磁化强度最高为2.06 emu/g。另一方面，5% fe掺杂的CuO样品在300 K时表现出~ 31 Oe的交换偏置场。

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来源期刊

Nanoscale Research Letters 工程技术-材料科学：综合

CiteScore

11.30

自引率

0.00%

发文量

110

审稿时长

48 days

期刊介绍： Nanoscale Research Letters (NRL) provides an interdisciplinary forum for communication of scientific and technological advances in the creation and use of objects at the nanometer scale. NRL is the first nanotechnology journal from a major publisher to be published with Open Access.