Colloidal CdS Quantum Dot Fibers Prepared by Electrospinning of Their Wet Gel for Quantum Nanowires
Colloidal CdS Quantum Dot Fibers Prepared by Electrospinning of Their Wet Gel for Quantum Nanowires
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DOI：
10.1021/acsanm.1c04403
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发表时间：
2022-03
影响因子：
5.9
通讯作者：
Kazushi Enomoto;K. Takeda;Naoto Iwata;Kiyohiro Adachi;T. Kikitsu;Y. Ishida;Daisuke Hashizume;Manabu Tanaka;H. Kawakami;Yong‐Jin Pu
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作者：
Kazushi Enomoto;K. Takeda;Naoto Iwata;Kiyohiro Adachi;T. Kikitsu;Y. Ishida;Daisuke Hashizume;Manabu Tanaka;H. Kawakami;Yong‐Jin Pu
量子点（QD）组装图案的尺寸控制在光电应用中得到了广泛的研究。然而，量子点的长程有序一维（1D）结构仍然具有挑战性。在这项研究中，一维纤维组装的CdS量子点长度几百微米，实现了静电纺丝湿量子点凝胶具有粘弹性。在通过典型的热注入法合成的粗CdS量子点的纯化中，使用具有受控的少量水的丙酮来沉淀量子点。将这种纯化的CdS量子点重新溶解到甲苯中独特地形成了湿凝胶。流变学测试表明，所形成的湿凝胶显示出粘弹性和机械变形后的快速恢复。通过扫描电子显微镜、透射电子显微镜和X-射线衍射研究了量子点凝胶的内部结构，发现量子点在凝胶中密集地堆积成网络结构。通过静电纺丝的CdS量子点湿凝胶形成的纳米纤维的CdS量子点，和纤维的直径和长度分别约为110 nm和几百微米。从湿凝胶中制备CdS量子点为量子纳米线的制备提供了一种策略。
Dimensional control of quantum dot (QD) assembly patterns has been widely studied for optoelectronic applications. Nevertheless, the long-range ordered one-dimensional (1D) structure of QDs is still challenging. In this study, 1D fibrous assembly of CdS QDs several hundred micrometers in length was achieved by electrospinning a wet QD gel with viscoelastic properties. In the purification of crude CdS QDs synthesized by a typical hot injection method, acetone with a controlled small amount of water was used to precipitate the QDs. Redissolution of such purified CdS QDs into toluene uniquely formed a wet gel. Rheology measurements showed that the formed wet gel showed viscoelastic properties and quick recovery after mechanical deformation. The internal structure of the QD gel was investigated by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, revealing that the QDs were densely packed with a network structure in the gel. Nanofibers of the CdS QDs were formed by electrospinning the CdS QD wet gel, and the diameter and length of the fibers were approximately 110 nm and several hundred micrometers, respectively. The nanofiber formation of CdS QDs from a wet gel provides a strategy for the creation of quantum nanowires.