Controllable 1D Patterned Assembly of Colloidal Quantum Dots on PbSO4 Nanoribbons
Controllable 1D Patterned Assembly of Colloidal Quantum Dots on PbSO4 Nanoribbons
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DOI：
10.1002/adfm.201905175
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发表时间：
2019-07
影响因子：
19
通讯作者：
Kazushi Enomoto;D. Inoue;Yong‐Jin Pu
中科院分区：
文献类型：
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作者：
Kazushi Enomoto;D. Inoue;Yong‐Jin Pu
实现了对硫酸铅纳米带（NRb）模板上胶体量子点（QD）一维自组装图案的控制。通过X射线衍射研究了纳米带的内部结构，揭示了硫酸铅纳米簇在纳米带中的各向同性堆积。氯仿/己烷混合物中的胶体量子点被吸附到靠近纳米带边缘的区域，并通过控制油胺（OAm）的量形成直线或双线的一维组装。这是首次在不使用任何分子桥或粘合剂的情况下，展示了具有直线图案的胶体量子点密集堆积的一维自组装。对纳米带的原子力显微镜测量显示，沿着纳米带宽度的相位轮廓存在凹陷，这与一维量子点链的位置相对应。随着油胺添加量的增加，溶液中纳米带上吸附的量子点数量减少，这表明额外的油胺阻止了量子点与纳米带之间的相互作用，但有利于一维组装的均匀吸附。本研究中胶体量子点的低维自组装为创建各向异性组装的量子点超结构提供了可能性。
Control of the 1D self‐assembly pattern of colloidal quantum dots (QDs) on PbSO4 nanoribbon (NRb) templates is achieved. The internal structure of the NRbs is investigated by X‐ray diffraction, revealing the isotropic packing of the PbSO4 nanoclusters in the NRbs. Colloidal QDs in a chloroform/hexane mixture are adsorbed onto the region close to the edges of the NRbs and form a 1D assembly of straight single line or double lines by controlling the amount of OAm. This is the first demonstration of a densely packed 1D self‐assembly of colloidal QDs with a straight line pattern without the use of any molecular bridge or adhesive. Atomic force microscopy measurements of the NRbs show depressions in the phase profile along the width of the NRbs, corresponding to the position of the 1D QD chain. The amount of adsorbed QDs on the NRbs in solution decreases as the addition of OAm increases, suggesting that additional OAm prevents interaction between the QDs and NRbs but facilitates the uniform adsorption of the 1D assembly. The low‐dimensional self‐assembly of colloidal QDs in this study opens up the possibility for the creation of anisotropically assembled QD superstructures.