Sohail Ahmad, Muhammad Usman, Muhammad Hashim, Atizaz Ali, Rasool Shah, Naveed Ur Rahman
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引用次数: 0
摘要
采用共沉淀工艺合成了未掺杂氧化锌和掺杂镍氧化锌(镍=Zn0.98Ni0.02O、Zn0.96Ni0.04O 和 Zn0.94Ni0.06O)的纳米结构,并同时研究了它们的光学和介电性能。X 射线衍射(XRD)结果证实其为六方结构,空间群为 P63mc。随着镍浓度的增加,粒度减小,而应变增加。为了进一步了解掺镍氧化锌中存在的声子模式,还进行了傅立叶变换红外(FTIR)分析。紫外可见光谱进一步显示,掺镍样品的光带隙从 3.18 eV 到 2.80 eV 不等。扫描电镜分析证实了已合成样品的棒状形态。电离辐射 X 分析研究了氧化锌晶格中掺入镍离子的情况。通过光致发光光谱分析,我们发现合成材料中存在氧空位(Vo)和锌间隙(Zni)缺陷。与未掺杂的氧化锌相比,掺镍氧化锌的介电常数(εr)和介电损耗(ε)都有所提高。由于镍离子与锌离子交换后,更多的电荷载流子得到了增强,因此与未掺杂的氧化锌相比,掺杂镍后的交流导电率(σa.c)得到了改善。
Investigation of Optical and Dielectric Properties of Nickel-Doped Zinc Oxide Nanostructures Prepared via Coprecipitation Method
Nanostructures of undoped zinc oxide and nickel-doped zinc oxide (Ni = Zn0.98Ni0.02O, Zn0.96Ni0.04O, and Zn0.94Ni0.06O) were synthesized by using the coprecipitation process, and their optical and dielectric properties were simultaneously investigated. The XRD results confirm the hexagonal structure having space group P63mc. By increasing nickel concentration, the particle size decreases, while the strain is increased. Fourier-transform infrared (FTIR) analysis was carried out in order to learn more about the phonon modes present in nickel-doped zinc oxide. UV-Vis spectroscopy further revealed that the optical band gap of nickel-doped samples varied from 3.18 eV to 2.80 eV. The SEM analysis confirms the rod shape morphology of the already synthesized samples. EDX analysis investigates the incorporation of nickel ions into the zinc oxide lattice. Using photoluminescence spectroscopy, we found that the synthesized materials had oxygen vacancies (Vo) and zinc interstitial (Zni) defects. Dielectric constant (εr) and dielectric loss (ε) are both improved in nickel-doped zinc oxide compared to undoped zinc oxide. Since more charge carriers enhanced after the nickel ions were exchanged for the Zn ions, the AC electrical conductivity (σa.c) improves by nickel doping compared to undoped zinc oxide.
期刊介绍:
Nanomaterials and Nanotechnology is a JCR ranked, peer-reviewed open access journal addressed to a cross-disciplinary readership including scientists, researchers and professionals in both academia and industry with an interest in nanoscience and nanotechnology. The scope comprises (but is not limited to) the fundamental aspects and applications of nanoscience and nanotechnology