Chen Yi-An, Chou Kuo-Hsien, Kuo Yi-Yang, Wu Cheng-Ye, Hsiao Po-Wen, Chen Po-Wei, Yuan Shuo-Huang, Wuu Dong-Sing
Department of Materials Science and Engineering, National Chung Hsing University, 145 Xingda Road, Taichung 40227, Taiwan.
Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung 40227, Taiwan.
Nanomaterials (Basel). 2019 Jul 11;9(7):999. doi: 10.3390/nano9070999.
To the best of our knowledge, this report presents, for the first time, the schematic of the possible chemical reaction for a one-pot synthesis of ZnCdSe alloy quantum dots (QDs) in the presence of low/high oleylamine (OLA) contents. For high OLA contents, high-resolution transmission electron microscopy (HRTEM) results showed that the average size of ZnCdSe increases significantly from 4 to 9 nm with an increasing OLA content from 4 to 10 mL. First, [Zn(OAc)]-OLA complex can be formed by a reaction between Zn(OAc) and OLA. Then, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) data confirmed that ZnO is formed by thermal decomposition of the [Zn(OAc)]-OLA complex. The results indicated that ZnO grew on the ZnCdSe surface, thus increasing the particle size. For low OLA contents, HRTEM images were used to estimate the average sizes of the ZnCdSe alloy QDs, which were approximately 8, 6, and 4 nm with OLA loadings of 0, 2, and 4 mL, respectively. We found that Zn(OAc) and OLA could form a [Zn(OAc)]-OLA complex, which inhibited the growth of the ZnCdSe alloy QDs, due to the decreasing reaction between Zn(oleic acid) and Se, which led to a decrease in particle size.
据我们所知，本报告首次展示了在低/高油胺（OLA）含量存在下一锅法合成ZnCdSe合金量子点（QDs）可能的化学反应示意图。对于高OLA含量，高分辨率透射电子显微镜（HRTEM）结果表明，随着OLA含量从4 mL增加到10 mL，ZnCdSe的平均尺寸从4 nm显著增加到9 nm。首先，Zn（OAc）与OLA反应可形成[Zn（OAc）]-OLA络合物。然后，傅里叶变换红外（FTIR）光谱和X射线衍射（XRD）数据证实，[Zn（OAc）]-OLA络合物热分解形成ZnO。结果表明，ZnO在ZnCdSe表面生长，从而增加了粒径。对于低OLA含量，使用HRTEM图像估计ZnCdSe合金量子点的平均尺寸，当OLA负载量分别为0、2和4 mL时，其平均尺寸约为8、6和4 nm。我们发现，Zn（OAc）和OLA可形成[Zn（OAc）]-OLA络合物，由于Zn（油酸）与Se之间的反应减少，抑制了ZnCdSe合金量子点的生长，导致粒径减小。
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