Strong Ferromagnetic, Dielectric Constant, and Photocatalytic Properties of a (Co, Mo) Modified Nanocrystalline ZnO Semiconductor

IF 1.6 4区 物理与天体物理 Q3 PHYSICS, APPLIED
Ghayah M. Alsulaim, Kholoud M. Alnahdi, Shada A. Alsharif, Hanan A. Althikrallah
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引用次数: 0

Abstract

The nanocrystalline composition of Zn0.95Co0.02Mo0.03O revealed advanced and promising multifunctional characteristics for data and energy storage applications as well as environmental pollution treatment. Pure ZnO, Zn0.97Co0.02Mo0.01O, and Zn0.95Co0.02Mo0.03O samples were simply synthesized at 400 °C. For all samples, all X-ray diffraction (XRD) peaks were perfectly assigned to the zinc oxide (ZnO) compound with hexagonal structure. The relation between the ionic size of Zn2+, Co2+, and Mo4+ ions, shift of XRD peaks, and variation of unit cell volume evidenced the actual substitution process. The insertion of Co2+ and Mo4+ ions spread the optical response of ZnO to the visible light spectrum by reducing its band gap energy from 3.25 to 2.9 and 2.8 eV. The scanning electron microscopy (SEM) micrographs of both codoped Zn0.97Co0.02Mo0.01O and Zn0.95Co0.02Mo0.03O samples display the formation of particles with sheets shaped like rose leaves and fine spherical particles. Magnetically, the composition of Zn0.95Co0.02Mo0.03O exhibits a strong ferromagnetic order at room temperature with perfect hysteresis loop nature and a high saturation magnetization of 1.11 emu/g. For energy storage uses, Zn0.97Co0.02Mo0.01O and Zn0.95Co0.02Mo0.03O samples exhibit a colossal dielectric constant (relative permittivity) of 11,560 and 21,019 at low frequency, respectively. The incorporation of (Co, Mo) significantly improved the sunlight-photocatalytic performance of the ZnO catalyst for depollution of stable Reactive Blue 19 (RB19) dye, leading to a total photodegradation efficiency of 98% in 75 min. In addition, the Zn0.95Co0.02Mo0.03O photocatalyst has a high stability for recyclability and a high ability to mineralize the RB19 dye to CO2 and H2O.

Graphical Abstract

Abstract Image

一种(钴、钼)改性纳米晶氧化锌半导体的强铁磁性、介电常数和光催化特性
Zn0.95Co0.02Mo0.03O的纳米结晶成分显示出先进而有前景的多功能特性,可用于数据和能量存储以及环境污染处理。纯 ZnO、Zn0.97Co0.02Mo0.01O 和 Zn0.95Co0.02Mo0.03O 样品在 400 ℃ 下简单合成。所有样品的所有 X 射线衍射(XRD)峰都完全归属于六方结构的氧化锌(ZnO)化合物。Zn2+、Co2+ 和 Mo4+ 离子的离子尺寸、X 射线衍射峰的移动以及单胞体积的变化之间的关系证明了实际的置换过程。Co2+ 和 Mo4+ 离子的插入将 ZnO 的带隙能从 3.25 eV 降低到 2.9 eV 和 2.8 eV,从而使 ZnO 的光学响应扩展到可见光光谱。掺杂 Zn0.97Co0.02Mo0.01O 和 Zn0.95Co0.02Mo0.03O 样品的扫描电子显微镜(SEM)显微照片显示,形成了形似玫瑰叶的片状颗粒和细小的球形颗粒。在磁性方面,Zn0.95Co0.02Mo0.03O 的成分在室温下表现出很强的铁磁性,具有完美的磁滞回线性质,饱和磁化率高达 1.11 emu/g。对于储能用途,Zn0.97Co0.02Mo0.01O 和 Zn0.95Co0.02Mo0.03O 样品在低频下分别表现出 11,560 和 21,019 的巨大介电常数(相对介电常数)。Co、Mo)的加入显著提高了氧化锌催化剂对稳定的活性蓝 19(RB19)染料的日光光催化去污性能,使其在 75 分钟内的总光降解效率达到 98%。此外,Zn0.95Co0.02Mo0.03O光催化剂具有高稳定性和可回收性,并能将RB19染料矿化为CO2和H2O。
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来源期刊
Journal of Superconductivity and Novel Magnetism
Journal of Superconductivity and Novel Magnetism 物理-物理:凝聚态物理
CiteScore
3.70
自引率
11.10%
发文量
342
审稿时长
3.5 months
期刊介绍: The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.
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