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A comprehensive spectroscopic study of Mn~(2+) doped PbS nanocrystals

机译：Mn〜（2+）掺杂的PbS纳米晶体的综合光谱研究

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摘要

Zero-dimensional Mn_(2+)doped PbS semiconductor nanocrystals with Mn_(2+)concentration varying between 0.05 and 0.52% (wt%) have been synthesized by simple chemical routes. This work is an effort to dope one of the most studied semiconductor PbS nanocrystal system with one of the widely studied transition metal dopant Mn_(2+)ion and describes new physical properties that have emerged following successful synthesis of these nanocrystals. The PbS:Mn nanocrystals have cubic structure (space group Fm3m), the average crystallite size lies between 5 and 10 nm and lattice constant $$a$$ a slightly changes with the variation of doping concentration of Mn_(2+)ions as characterized by X-ray diffraction (XRD). The structural properties of PbS:Mn nanoparticles are also studied by high resolution transmission electron microscopy (HRTEM) analysis and UV/Vis absorption spectrum. The quantitative chemical analysis of pure and Mn_(2+)doped PbS nanocrystals have been done with the help of energy dispersive spectroscopy (EDS) spectra. The energy band gap have been determined by UV/Vis absorption study with the help of Tauc plot and are 1.50, 1.54, 1.57 and 1.65 eV for 0, 0.05, 0.26 and 0.52% Mn_(2+)doped PbS nanocrystals, respectively. The crystallite size also obtained from the UV/Vis absorption study varies between 5.53 and 5.20 nm with the increase of Mn_(2+)concentration from 0.05 to 0.52% which are in good agreement with XRD and HRTEM results. The luminescence behaviour of the nanocrystals has been studied by photoluminescence (PL) spectra. The magnetic and electronic properties of PbS:Mn nanocrystals are studied using electron paramagnetic resonance (EPR) spectra and the values of the electron $$g$$ g factor, the second-rank axial zero-field splitting parameter D and the hyperfine parameter A are calculated.
机译：通过简单的化学途径合成了Mn_（2+）浓度在0.05〜0.52％（wt％）之间的零维掺杂Mn_（2+）的PbS半导体纳米晶体。这项工作是一种努力，用一种经过广泛研究的过渡金属掺杂剂Mn_（2+）离子掺杂一种研究最多的半导体PbS纳米晶体，并描述了成功合成这些纳米晶体后出现的新物理性质。 PbS：Mn纳米晶体具有立方结构（空间群Fm3m），平均微晶尺寸在5至10nm之间，晶格常数为$ a $$，随Mn_（2+）离子掺杂浓度的变化而略有变化。通过X射线衍射（XRD）。还通过高分辨率透射电子显微镜（HRTEM）分析和UV / Vis吸收光谱研究了PbS：Mn纳米颗粒的结构特性。借助能量色散光谱（EDS）光谱对纯和Mn_（2+）掺杂的PbS纳米晶体进行了定量化学分析。借助Tauc曲线通过UV / Vis吸收研究确定了能带隙，并且Mn_（2+）掺杂的PbS纳米晶体的0、0.05、0.26和0.52％的能带隙分别为1.50、1.54、1.57和1.65eV。从UV / Vis吸收研究中获得的微晶尺寸在5.53至5.20 nm之间变化，Mn_（2+）浓度从0.05增加到0.52％，这与XRD和HRTEM结果非常吻合。纳米晶体的发光行为已通过光致发光（PL）光谱进行了研究。使用电子顺磁共振（EPR）光谱和电子$ g $$ g因子，第二级轴向零场分裂参数D和超精细参数A的值研究PbS：Mn纳米晶体的磁性和电子性质。计算。

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  • 来源
    《Journal of materials science》 |2018年第14期|12195-12205|共11页
  • 作者

    Ram Kripal; Upendra Mani Tripathi;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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