Production of carbon dots during the liquid phase exfoliation of MoS2 quantum dots
Production of carbon dots during the liquid phase exfoliation of MoS2 quantum dots
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MoS2量子点液相剥离过程中碳点的产生
DOI：
10.1016/j.carbon.2019.08.067
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发表时间：
2019-12
期刊：
影响因子：
10.9
通讯作者：
Cheng Hui-Ming
中科院分区：
文献类型：
--
作者：
Zhang Weimin;Du Jinhong;Liu Zhibo;Zhang Dingdong;Wei Qinwei;Liu Haichao;Ma Wei;Ren Wencai;Cheng Hui-Ming
N-甲基-2-吡咯烷酮（NMP）已广泛用作通过探针超声处理制备二维量子点（2D-QD）的溶剂。在这里，我们发现，当在 NMP 溶剂中通过探针超声处理制备 MoS2QD 时，NMP 的碳化同时产生碳点（CD）。这两种量子点在颜色、晶体结构、激发波长依赖性光致发光（PL）方面相似，并且它们的吸收光谱和PL峰重合具有重叠。因此，CD 的联合制作此前并未得到认可。 CD与MoS2QD表现出强烈的光学相互作用，这导致CD/MoS2QD的荧光强度急剧下降。此外，我们发现常用的有机溶剂也会发生碳化。这些发现表明，在通过探针超声处理制备 2D-QD 时，应考虑 CD 的相关生产，由此产生的混合 CD/2D-QD 将为设计其特性和用途提供机会。
N-methyl-2-pyrrolidone (NMP) has been widely used as a solvent for preparing two-dimensional quantum dots (2D-QDs) by probe sonication. Here we found that carbon dots (CDs) are simultaneously produced by the carbonization of NMP when preparing MoS2QDs in a NMP solvent by probe sonication. These two kinds of QDs are similar in color, crystal structure, excitation wavelength dependent photoluminescence (PL), and have overlaps in their absorption spectra and coincidence of PL peaks. As a result, the co-production of CDs has not previously been recognized. The CDs show strong optical interactions with the MoS2QDs, which leads to a dramatic decrease in the fluorescence intensity of the CDs/MoS2QDs. Moreover, we found that the carbonization also occurs for the commonly used organic solvents. These findings suggest that associated production of CDs should be considered when preparing 2D-QDs by probe sonication, and the resulting hybrid CDs/2D-QDs will provide opportunities to design their properties and uses.
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