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首页> 外文期刊>Advanced Functional Materials >One-Step Solvent-Free Synthesis and Characterization of Zn_(1-x)Mn_xSe@C Nanorods and Nanowires
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One-Step Solvent-Free Synthesis and Characterization of Zn_(1-x)Mn_xSe@C Nanorods and Nanowires

机译：Zn_（1-x）Mn_xSe @ C纳米棒和纳米线的一步法无溶剂合成与表征

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摘要

The carbon-encapsulated, Mn-doped ZnSe Zn_(1-x)Mn_xSe@C nanowires, nanorods, and nanoparticles are synthesized by the solvent-free, one-step RAPET (reactions under autogenic pressure at elevated temperature) approach. The aspect ratio of the nanowiresanorods is altered according to the Mn/Zn atomic ratio, with the maximum being observed for Mn/Zn = 1:20. A 10-20 nm amorphous carbon shell is evidenced from electron microscopy analysis. The replacement of Zn by Mn in the Zn_(1-x)Mn_xSe lattice is confirmed by the hyperfine splitting values in the electron paramagnetic resonance (EPR) experiments. Raman experiments reveal that the Zn_(1-x)Mn_xSe core is highly crystalline, while the shell consists of disordered graphitic carbon. Variable-temperature cathodoluminescence measurements are performed for all samples and show distinct ZnSe near-band-edge and Mn-related emissions. An intense and broad Mn-related emission at the largest Mn alloy composition of 19.9% is further consistent with an efficient incorporation of Mn within the host ZnSe lattice. The formation of the core/shell nanowires and nanorods in the absence of any template or structure-directing agent is controlled kinetically by the Zn_(1-x)Mn_xSe nucleus formation and subsequent carbon encapsulation. Mn replaces Zn mainly in the (111) plane and catalyzes the nanowire growth in the [111] direction.
机译：通过无溶剂的一步RAPET（在高温下自生压力下的反应）方法合成了碳封装的Mn掺杂的ZnSe Zn_（1-x）Mn_xSe @ C纳米线，纳米棒和纳米颗粒。纳米线/纳米棒的长宽比根据Mn / Zn原子比而改变，其中Mn / Zn = 1:20时观察到最大值。从电子显微镜分析可以证明10-20nm的无定形碳壳。电子顺磁共振（EPR）实验中的超精细分裂值证实了Zn_（1-x）Mn_xSe晶格中Mn取代Zn的现象。拉曼实验表明，Zn_（1-x）Mn_xSe核是高度结晶的，而壳由无序石墨碳组成。对所有样品进行了可变温度阴极发光测量，结果显示出明显的ZnSe近带边缘和Mn相关发射。在最大的Mn合金成分为19.9％时，强烈而宽泛的Mn相关发射与在主体ZnSe晶格中有效掺入Mn进一步一致。在不存在任何模板或结构定向剂的情况下，核/壳纳米线和纳米棒的形成由Zn_（1-x）Mn_xSe原子核形成和随后的碳封装动力学控制。 Mn主要在（111）平面上取代Zn，并催化纳米线在[111]方向上生长。

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