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球形钴铁氧体纳米粒子的可控一锅水热合成：合成、表征及光学性质

A controllable one-pot hydrothermal synthesis of spherical cobalt ferrite nanoparticles: synthesis, characterization, and optical properties.

作者信息

Refat Nedaa M, Nassar Mostafa Y, Sadeek Sadeek A

机构信息

Chemistry Department, Faculty of Science, Zagazig University Zagazig Egypt

Chemistry Department, Faculty of Science, Benha University Benha 13518 Egypt

出版信息

RSC Adv. 2022 Sep 5;12(38):25081-25095. doi: 10.1039/d2ra03345c. eCollection 2022 Aug 30.

DOI:10.1039/d2ra03345c
PMID:36199874
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9443479/
Abstract

We herein report the controllable synthesis of spherical cobalt ferrite nanoparticles with average crystallite size in the range of 3.6-12.9 nm using a facile, eco-friendly, hydrothermal method. The hydrothermal treatment was carried out by utilizing cobalt nitrate, ferric nitrate, and ammonium hydroxide in the presence and absence of Arabic gum as a surfactant agent. The purity and crystallinity of the products were tuned by varying reaction conditions such as reaction time (0.5-8 h), reaction temperature (120-180 °C), percentage of ethylene glycol (0-100% (v/v)), pH (8-9.6), and amount of Arabic gum (0-2 g). We characterized the prepared products using X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectroscopy analysis (EDS), selected area electron diffraction (SAED) patterns, and UV-visible diffuse reflectance spectra (DRS). The optimal hydrothermal treatment was performed at 180 °C and pH 9.6 for 4 h in aqueous media. The results also revealed that the as-prepared spinel cobalt ferrite nanoparticles have an estimated optical band gap energy in the range of 1.6-1.9 eV, indicating the semiconducting characteristics of the products.

摘要

我们在此报告，使用一种简便、环保的水热法可控合成了平均晶粒尺寸在3.6 - 12.9纳米范围内的球形钴铁氧体纳米颗粒。水热处理是在有和没有阿拉伯胶作为表面活性剂的情况下，利用硝酸钴、硝酸铁和氢氧化铵进行的。通过改变反应条件，如反应时间（0.5 - 8小时）、反应温度（120 - 180°C）、乙二醇百分比（0 - 100%（v/v））、pH值（8 - 9.6）和阿拉伯胶用量（0 - 2克），来调节产物的纯度和结晶度。我们使用X射线衍射（XRD）、场发射扫描电子显微镜（FE - SEM）、傅里叶变换红外光谱（FT - IR）、高分辨率透射电子显微镜（HR - TEM）、能量色散X射线光谱分析（EDS）、选区电子衍射（SAED）图案和紫外可见漫反射光谱（DRS）对制备的产物进行了表征。最佳水热处理是在180°C和pH 9.6的水溶液中进行4小时。结果还表明，所制备的尖晶石钴铁氧体纳米颗粒的估计光学带隙能量在1.6 - 1.9电子伏特范围内，表明产物具有半导体特性。

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