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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >General Strategy for Doping Impurities (Ge, Si, Mn, Sn, Ti) in Hematite Nanocrystals
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General Strategy for Doping Impurities (Ge, Si, Mn, Sn, Ti) in Hematite Nanocrystals

机译：赤铁矿纳米晶体中掺杂杂质（Ge，Si，Mn，Sn，Ti）的一般策略

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摘要

The doping of foreign atoms is critical in tailoring the properties and potential applications of semiconductor nanocrystals. A general strategy for successfully incorporating various impurities (e.g., Ge, Si, Mn, Sn, Ti) inside the regular crystal lattice of hematite (α-Fe2O3), a promising candidate for water splitting and environmental protection, is developed. Liquid-phase laser ablation-derived colloidal clusters are used as doping precursors for the metastable growth of doped hematite nanocrystals, thereby avoiding surfactants and hazardous liquid byproducts. The doping percentage, morphology, and structure of the hematite nanocrystals are greatly affected by the type and amount of the colloidal precursors used. High-resolution transmission electron microscopy and the corresponding component analysis reveal that the dopant atoms either form superlattice structures (Ge and Si) or distribute as disordered solid solutions (Mn, Sn, Ti) inside the crystal lattice of hematite. The optical absorption spectra and the resulting band gaps of the doped-hematite nanocrystals are investigated. Typical electronic transitions consisting of ligand to metal charge transitions, Fe~(3+) d—d transitions, and pair excitations distinctly occur in the optical spectra. The simultaneous incorporation of impurities and preferential growth mechanism of hematite nanocrystals are also further elaborated.
机译：掺杂外来原子对于调整半导体纳米晶体的特性和潜在应用至关重要。已开发出一种成功地将各种杂质（例如，Ge，Si，Mn，Sn，Ti）掺入赤铁矿（α-Fe2O3）的规则晶格中的一般策略，赤铁矿是一种有希望用于水分解和环境保护的候选物。液相激光烧蚀衍生的胶体簇用作掺杂的前驱体，用于掺杂的赤铁矿纳米晶体的亚稳态生长，从而避免了表面活性剂和有害的液体副产物。赤铁矿纳米晶体的掺杂百分比，形态和结构在很大程度上受到所用胶体前体的类型和数量的影响。高分辨率透射电子显微镜和相应的成分分析表明，掺杂原子要么在超铁矿的晶格内形成超晶格结构（Ge和Si），要么作为无序固溶体（Mn，Sn，Ti）分布。研究了掺杂的赤铁矿纳米晶体的光吸收光谱和所得的带隙。由配体到金属的电荷跃迁，Fe〜（3+）d-d跃迁和成对激发组成的典型电子跃迁在光谱中明显发生。还进一步阐述了杂质的同时掺入和赤铁矿纳米晶体的优先生长机理。

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