State key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
Langmuir. 2012 Dec 21;28(51):17811-6. doi: 10.1021/la304228w. Epub 2012 Dec 11.
Wide-band-gap rock-salt (RS) MnS nanocubes were synthesized by the one-pot solvent thermal approach. The edge length of the nanocubes can be easily controlled by prolonging the reaction time (or aging time). We systematically explored the formation of RS-MnS nanocubes and found that the present synthetic method is virtually a combination of oriented aggregation and intraparticle ripening processes. Furthermore, these RS-MnS nanocubes could spontaneously assemble into ordered superlattices via the natural cooling process. The optical and magnetic properties were investigated using measured by UV-vis absorption, photoluminescence spectra, and a magnetometer. The obtained RS-MnS nanocubes exhibit good ultraviolet optical properties depending on the size of the samples. The magnetic measurements suggest that RS-MnS nanocubes consist of an antiferromagnetic core and a ferromagnetic shell below the blocking temperatures. Furthermore, the hysteresis measurements indicate these RS-MnS nanocubes have large coercive fields (e.g., 1265 Oe for 40 nm nanocubes), which is attributed to the size and self-assembly of the samples.
采用一锅溶剂热法合成了宽带隙岩盐 (RS) MnS 纳米立方体。通过延长反应时间（或老化时间），纳米立方体的边长可以很容易地控制。我们系统地研究了 RS-MnS 纳米立方体的形成，发现目前的合成方法实际上是定向聚集和颗粒内熟化过程的结合。此外，这些 RS-MnS 纳米立方体可以通过自然冷却过程自发组装成有序的超晶格。通过紫外-可见吸收、光致发光光谱和磁力计测量研究了光学和磁学性质。所得 RS-MnS 纳米立方体具有良好的紫外光学性质，这取决于样品的尺寸。磁测量表明，RS-MnS 纳米立方体在阻塞温度以下由反铁磁芯和铁磁壳组成。此外，滞后测量表明这些 RS-MnS 纳米立方体具有较大的矫顽场（例如，40nm 纳米立方体的矫顽场为 1265Oe），这归因于样品的尺寸和自组装。
