镁掺杂浓度对氧化锌纳米粒子结构和光学性能的影响

IF 1 4区 材料科学 Journal of Ovonic Research Pub Date : 2022-09-09 DOI:10.15251/jor.2022.184.565
M. Nazar, U. Mishal, M. Khalid, P. Fazil, M. Rahim
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引用次数: 0

摘要

在这项研究中,研究了镁掺杂氧化锌(Zn1-xMgxO)纳米粒子(x = 1%, 3%和5%)的光学和结构性质。采用简单的共沉淀法在300℃下合成。采用扫描电子显微镜(SEM)和x射线衍射仪(XRD)对结构样品进行了表征。利用能量色散x射线光谱(EDX)测定样品的化学成分。利用紫外可见光谱对样品的光学特性进行了研究。XRD分析表明,纯氧化锌和掺镁氧化锌均具有纤锌矿结构。随着Mg浓度的增加,颗粒大小明显减小,从纯样品的36 nm减小到5% Mg时的23.87 nm。与ZnO相比,mg掺杂ZnO的XRD谱图显示出向2θ值较低的峰移。由于将Mg+2离子集成到Zn+2位点上引起晶体结构变形。合成样品的SEM图像显示,在不同的x值下,纳米颗粒具有片状、球形和棒状的形貌。EDX分析验证了样品的纯度在检测限内。通过紫外可见光谱在200nm ~ 1000nm范围内的吸收光谱证实,随着Mg浓度的增加,带隙从纯样品的3.37 eV增加到5% Mg时的3.74 eV。纯ZnO和mg掺杂ZnO样品的紫外可见光谱在335 nm、311 nm、310.6 nm和310 nm处也有明显的峰。在纯氧化锌和mg掺杂氧化锌样品的光谱中,紫外峰归因于自由激子跃迁,而在mg掺杂氧化锌样品的光谱中,可见光区的紫外吸收峰归因于在氧空位上捕获的电子的辐射跃迁,而空穴被捕获在单电离的氧空位上。
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The effect of magnesium doping concentration on the structural and optical properties of zinc oxide nanoparticles
In this study, the optical and structural properties of Magnesium doped Zinc Oxide (Zn1-xMgxO) nanoparticles (x = 1%, 3%, and 5%) were examined. The synthesis was carried out at 300 oC by using a simple co-precipitation method. The structural samples were used to characterize the synthesized nanoparticles by using Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). Energy Dispersive X-Ray spectroscopy (EDX) was used to determine the chemical composition of the samples. Furthermore, UV-Vis spectroscopy was conducted to study our samples’ optical characteristics. As per XRD analysis, both pure and Mg doped ZnO samples possess wurtzite structure. The particle size was revealed to decrease significantly with Mg concentration, from 36 nm for pure sample to 23.87 nm with 5% Mg. In comparison to ZnO, the XRD pattern of Mg-doped ZnO shows a peak shift towards lower 2θ values. As a result of deformation of crystal structure caused by integrated Mg+2 ions onto Zn+2 sites. SEM images of synthesized samples reveal that the nanoparticles possess sheet, spherical and rod like morphologies for different values of x. The EDX analysis verifies the purity of samples within the detection limits. According to optical absorption spectra obtained from UV-Visible spectroscopy in the 200nm to 1000nm range affirmed that as Mg concentration increased, the band gap increased from 3.37 eV for pure sample to 3.74 eV with 5% Mg. The UV-Visible spectra of pure ZnO and Mg-doped ZnO samples also exhibit distinct peaks in the UV region at 335 nm, 311 nm, 310.6 nm, and 310 nm. Across the spectra of pure and Mg-doped ZnO samples, the UV peak is attributed to free exciton transitions, whereas, in the spectra of Mg-doped ZnO UV absorbance peak in the visible region is attributed to the radiative transitions of electrons captured at oxygen vacant sites with holes trapped at singly ionized oxygen vacancies.
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来源期刊
Journal of Ovonic Research
Journal of Ovonic Research Materials Science-Electronic, Optical and Magnetic Materials
CiteScore
1.60
自引率
20.00%
发文量
77
期刊介绍: Journal of Ovonic Research (JOR) appears with six issues per year and is open to the reviews, papers, short communications and breakings news inserted as Short Notes, in the field of ovonic (mainly chalcogenide) materials for memories, smart materials based on ovonic materials (combinations of various elements including chalcogenides), materials with nano-structures based on various alloys, as well as semiconducting materials and alloys based on amorphous silicon, germanium, carbon in their various nanostructured forms, either simple or doped/alloyed with hydrogen, fluorine, chlorine and other elements of high interest for applications in electronics and optoelectronics. Papers on minerals with possible applications in electronics and optoelectronics are encouraged.
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