Facile microwave approach to controllable boron nitride quantum dots
Facile microwave approach to controllable boron nitride quantum dots
复制标题
简便的微波方法制备可控氮化硼量子点
DOI：
10.1007/s10853-017-1395-9
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发表时间：
2017-12-01
影响因子：
4.5
通讯作者：
Bu, Xiaohai
中科院分区：
文献类型：
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作者：
Fan, Lidan;Zhou, Yuming;Bu, Xiaohai
氮化硼量子点（BNQDs）是一种具有独特光电性能的无金属量子点，本文采用简单高效的微波辐射技术可控制备BNQDs。尽管到目前为止已经报道了一些尝试，但探索一种有效的方法来合成具有均匀尺寸、良好分散性和高量子产率（QY）的高质量BNQD仍然具有挑战性。与溶剂热法相比，微波辐射法不仅具有能量输入效率高、时间短等优点，而且是一种先进的合成方法。令人鼓舞的是，可以通过调节微波反应温度以及持续时间来很好地控制BNQD的粒径和QY。所制备的BNQDs的平均粒径为1.98 ~ 7.05 nm，量子产率高达23.44%。此外，由于独特的纳米结构，量子限制效应和高介电损耗，所制备的BNQD在8.9 GHz处表现出最佳反射损耗为−19.6 dB，在2-18 GHz频率范围内具有5.02 GHz的宽有效吸收带宽，显示出作为电磁干扰领域潜在的微波吸收材料。
Boron nitride quantum dots (BNQDs), as promising metal-free quantum dots with unique photoelectric properties, have been controllably fabricated by a facile and high-efficiency microwave irradiation technique in this work. Though a number of attempts have been reported so far, it remains challenging to explore an effective approach to synthesize high-quality BNQDs with uniform size, well dispersion and high quantum yield (QY). Microwave irradiation strategy is identified as an advanced and beneficial method not only for high-efficiency energy inputting but also time-saving in comparison with the reported solvothermal process. Encouragingly, the particle size and QY of BNQDs can be well controlled by adjusting microwave reaction temperature as well as duration time. The average diameter of the as-prepared blue luminescent BNQDs ranges from 1.98 to 7.05 nm with QY up to 23.44%. Furthermore, attributed to the unique nanostructure, quantum confinement effect, and high dielectric loss, the as-prepared BNQDs exhibits an optimal reflection loss of −19.6 dB at 8.9 GHz with a broad effective absorption bandwidth of 5.02 GHz in the frequency range of 2–18 GHz, demonstrating as potential microwave absorption material in electromagnetic interference field.