Boron Nitride Quantum Dots with Solvent-Regulated Blue/Green Photoluminescence and Electrochemiluminescent Behavior for Versatile Applications
Boron Nitride Quantum Dots with Solvent-Regulated Blue/Green Photoluminescence and Electrochemiluminescent Behavior for Versatile Applications
复制标题
具有溶剂调节蓝/绿光致发光和电化学发光行为的氮化硼量子点，适用于多种应用
DOI：
10.1002/adom.201600661
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发表时间：
2017-02-01
影响因子：
9
通讯作者：
Liu, Jingquan
中科院分区：
文献类型：
--
作者：
Liu, Mengli;Xu, Yuanhong;Liu, Jingquan
氮化硼量子点（BNQDs）的新光学特性、产生机制和广泛适用性的探索仍处于初级阶段。本文采用液体剥离-溶剂热处理方法在三种不同的溶剂中制备了BNQDs。在乙醇（或N， N-二甲基甲酰胺（DMF））和N-甲基-2-吡咯烷酮（NMP）中，BNQDs的光致发光分别为蓝色和绿色。在乙醇、DMF和NMP溶剂中，BNQDs的量子产率（QYs）和平均横向尺寸分别为12.6%和4.1 +/- 0.2 nm， 16.4%和2.8 +/- 0.3 nm， 21.3%和2.0 +/- 0.2 nm。不同的尺寸，qy和BNQDs的光学性质被发现依赖于这些溶剂的极性。不同的bnqd可以按需选择，用于多种应用。例如，绿色的BNQDs在作为无标记铁离子特异性检测的荧光传感平台时，比蓝色的BNQDs更具竞争力，而乙醇中的蓝色BNQDs则更易于用于细胞成像和纤维染色。更重要的是，首次以半胱氨酸为共聚物，观察和研究了BNQDs的电化学发光特性。提出了BNQDs系统可能的ECL响应机制。
Exploration of novel optical features, generation mechanisms, and versatile applicability of boron nitride quantum dots (BNQDs) is still in nascent stage. Herein, BNQDs are prepared using liquid exfoliation-solvothermal treatment of bulk BN in three different solvents. The photoluminescence of BNQDs is blue in ethanol (or N, N-dimethylformamide (DMF)) and green in N-methyl-2-pyrrolidone (NMP) under the same UV-irradiation, respectively. The quantum yields (QYs) and average lateral sizes of the BNQDs are 12.6% and 4.1 +/- 0.2 nm, 16.4%, and 2.8 +/- 0.3 nm, as well as 21.3% and 2.0 +/- 0.2 nm in solvents of ethanol, DMF, NMP, respectively. The distinct sizes, QYs, and optical properties of the BNQDs are found to depend on the polarity of these solvents. Different BNQDs can be chosen on-demand for versatile applications. For example, the green BNQDs are much more competitive than the blue ones when serving as a fluorescent sensing platform for label-free specific detection of ferric ions, while the blue ones in ethanol are much handier for cell imaging and fiber staining. More importantly, electrochemiluminescence (ECL) property of the BNQDs is observed and studied for the first time using cysteine as a co-reactant. The possible ECL response mechanism of the BNQDs system is also proposed.