Controllable preparation of boron nitride quantum dots with small size and strong blue photoluminescence
Controllable preparation of boron nitride quantum dots with small size and strong blue photoluminescence
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小尺寸、强蓝光氮化硼量子点的可控制备
DOI：
10.1016/j.colsurfa.2021.126181
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发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
Yu Yuanlie
中科院分区：
文献类型：
--
作者：
Chen Li;Zhang Xiaofang;Zhao Zhao;Wang Fan;Huang Yin;Bai Changning;An Lulu;Yu Yuanlie
氮化硼量子点（BNQDs）作为一种新型量子点（QDs），由于其良好的生物相容性、低细胞毒性和优异的光致发光性能，在疾病诊断、荧光成像和生物传感方面显示出广阔的应用前景。然而，制备均匀且小尺寸的BNQD仍然存在挑战。本文以剥离六方氮化硼纳米片（h-BNNSs）为前驱体，通过水热法制备了尺寸均匀、小尺寸的BNQD。通过透射电子显微镜（TEM）、高分辨率TEM、傅里叶变换红外光谱、X射线光电子能谱、紫外可见光致发光光谱（PL）对所制备的BNQD进行了形貌、表面官能团、元素组成和光学性质的表征。所制备的BNQD具有均匀的粒径分布，平均横向尺寸为1.65 nm，PL量子产率为2.49%。此外，所制备的BNQD在紫外可见光（365 nm）照射和纳秒发光衰减下表现出强烈的蓝色荧光。此外，还研究了制备参数对BNQDs荧光性能的影响，为制备具有优异荧光性能的BNQDs提供了最佳条件。所制备的BNQDs具有优异的理化性能、良好的生物相容性和低细胞毒性等优点，未来在医学诊断、生物传感、光电器件等领域具有巨大的潜力。
As a new type of quantum dots (QDs), boron nitride QDs (BNQDs), show promising potentials in disease diagnosis, fluorescence imaging and bio-sensing due to its good biocompatibility, low cytotoxicity and excellent photoluminescence performance. However, there are still challenges in preparing BNQDs with uniform and small size. In this paper, the BNQDs with uniform and small size have been prepared through a hydrothermal process with the exfoliated hexagonal boron nitride nanosheets (h-BNNSs) as precursor. The as-prepared BNQDs were characterized by transmission electron microscope (TEM), high-resolution TEM, fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, UV-visand photoluminescence spectra (PL) for morphology, surface functional groups, element composition and optical properties. The as-prepared BNQDs have uniform particle size distribution with an average lateral size of 1.65 nm, and a PL quantum yield of 2.49 %. In addition, the as-prepared BNQDs exhibit strong blue fluorescence under UV-vis(365 nm) irradiation and nanosecond luminescent decay. Furthermore, the effect of preparation parameters on the fluorescence performance of BNQDs was investigated which provides an optimal condition for the preparation of BNQDs with excellent fluorescence performance. Together with other advantages, such as excellent physical/chemical properties, good biocompatibility and low cytotoxicity, the as-prepared BNQDs have great potentials in medical diagnosis, biosensing, photoelectric devices and other fields in the future.
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