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首页> 外文期刊>Crystal growth & design >Phase control and formation mechanism of new-phase layer-structured rhombohedral In_3Se_4 hierarchical nanostructures
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Phase control and formation mechanism of new-phase layer-structured rhombohedral In_3Se_4 hierarchical nanostructures

机译:新型相层菱形In_3Se_4层级纳米结构的相控和形成机理

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摘要

New layer-structured rhombohedral In_3Se_4 hierarchical nanostructures, assembled by thin nanosheets with a thickness of ~20 nm, are controllably synthesized by an ethylenediaminetetraacetic acid (EDTA) and ascorbic acid (AA) assisted solvothermal method in a solvent of deionized water (DIW) and ethylene glycol (EG). Detailed structural and chemical characterizations, using transmission electron microscopy and X-ray diffraction with Rietveld refinement, reveal that the new In_3Se_4 phase crystallizes in a layered rhombohedral structure (space group: R3?m) with lattice parameters of a = 3.962 ± 0.001 ? and c = 39.59 ± 0.01 ? and with layers consisting of Se-In-Se-In-Se-In-Se. Through systematic investigation, the key synthesis parameters, namely, the EDTA/In mole ratio, DIW/EG volume ratio, AA dosage, and reaction temperature, are found to play vital roles in the formation of such rhombohedral hierarchical nanostructures. The investigation of intermediate products shows that the In_3Se_4 hierarchical nanostructures are formed by the reaction between Se microspheres and In precursors. This study provides a key method to large-scale fabrication of such a new In_3Se_4 phase for potential applications.
机译:通过乙二胺四乙酸(EDTA)和抗坏血酸(AA)辅助溶剂热法在去离子水(DIW)和有机溶剂中,可控地合成了厚度约20 nm的薄层纳米片组装而成的新型层状In_3Se_4分层纳米结构。乙二醇(EG)。使用透射电子显微镜和具有Rietveld改进的X射线衍射进行的详细结构和化学表征显示,新的In_3Se_4相在层状菱面体结构(空间群:R3?m)中结晶,晶格参数为a = 3.962±0.001?m。 c = 39.59±0.01?并由Se-In-Se-Se-Se-In-Se组成的层。通过系统的研究,发现关键的合成参数,即EDTA / In摩尔比,DIW / EG体积比,AA剂量和反应温度,在这种菱面体分层纳米结构的形成中起着至关重要的作用。对中间产物的研究表明,In_3Se_4分层纳米结构是由Se微球与In前驱物之间的反应形成的。这项研究为大规模生产这种潜在的应用In_3Se_4新相提供了一种关键方法。

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