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Uniform wurtzite MnSe nanocrystals with surface-dependent magnetic behavior

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Abstract

Manganese selenide (MnSe) possesses unique magnetic properties as an important magnetic semiconductor, but the synthesis and properties of MnSe nanocrystals are less developed compared to other semiconductor nanocrystals because of the inability to obtain high-quality MnSe, especially in the metastable wurtzite structure. Here, we have successfully fabricated wurtzite MnSe nanocrystals via a colloidal approach which affords uniform crystal sizes and tailored shapes. The selective binding strength of the amine surfactant is the determining factor in shape-control and shape-evolution. Bullet-shapes could be transformed into shuttle-shapes if part of the oleylamine in the reaction solution was replaced by trioctylamine, and tetrapod-shaped nanocrystals could be formed in trioctylamine systems. The three-dimensional (3D) structure of the bullet-shaped nanorods has been demonstrated by the advanced transmission electron microscope (TEM) 3D-tomography technology. High-resolution TEM (HRTEM) and electron energy-loss spectroscopy (EELS) show that planar-defect structures such as stacking faults and twinning along the [001] direction arise during the growth of bullet-shapes. On the basis of careful HRTEM observations, we propose a “quadra-twin core” growth mechanism for the formation of wurtzite MnSe nanotetrapods. Furthermore, the wurtzite MnSe nanocrystals show lowtemperature surface spin-glass behavior due to their noncompensated surface spins and the blocking temperatures increase from 8.4 K to 18.5 K with increasing surface area/volume ratio of the nanocrystals. Our results provide a systematic study of wurtzite MnSe nanocrystals.

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Authors and Affiliations

  1. Department of Materials Science and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, China

    Jie Zhang, Xuebing Zhao, Min Wang, Ying Li, Jiwei Liu, Qingsong Wu & Renchao Che

  2. Department of Chemistry, Fudan University, Shanghai, 200433, China

    Fan Zhang & Chongyun Liang

  3. National Laboratory of Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, 210093, China

    Xinran Wang

  4. Department of Physics, Fudan University, Shanghai, 200433, China

    Lifeng Yin

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  1. Jie Zhang
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  2. Fan Zhang
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  7. Min Wang
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Correspondence to Renchao Che.

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Zhang, J., Zhang, F., Zhao, X. et al. Uniform wurtzite MnSe nanocrystals with surface-dependent magnetic behavior. Nano Res. 6, 275–285 (2013). https://doi.org/10.1007/s12274-013-0305-y

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