Size-Controlled Synthesis of Bifunctional Magnetic and Ultraviolet Optical Rock-Salt MnS Nanocube Superlattices

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• 作者：Xinyi Yang ; Yingnan Wang ; Yongming Sui ; Xiaoli Huang ; Tian Cui ; Chunzhong Wang ; Bingbing Liu ; Guangtian Zou ; Bo Zou
• 刊名：Langmuir
• 出版年：2012
• 出版时间：December 21, 2012
• 年：2012
• 卷：28
• 期：51
• 页码：17811-17816
• 全文大小：406K
• 年卷期：v.28,no.51(December 21, 2012)
• ISSN：1520-5827

文摘

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鈥搗is 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.