[19p-E317-1~20] 9.2 Nanoparticles, Nanowires and Nanosheets

△ [19p-E317-15] Controllable 1D patterned assembly of colloidal quantum dots on PbSO₄nanoribbons

〇Kazushi Enomoto¹, Daishi Inoue¹, Yong-Jin Pu¹ (1.RIKEN CEMS)

Keywords:quantum dot, superlattice, self-assembly

Control of the one-dimensional (1D) self-assembly pattern of colloidal quantum dots (QDs) on PbSO₄nanoribbon (NRb) templates was achieved. NRbs were prepared by assembling oleylamine (OAm)-modified PbSO₄nanoclusters that were presynthesized by reacting tetrabutylammonium hydrogen sulfate, PbCl₂, and OAm. The internal structure of the NRbs was investigated by X-ray diffraction, revealing the isotropic packing of the PbSO₄nanoclusters in the NRbs. Colloidal QDs in a chloroform/hexane mixture were adsorbed onto the region close to the edges of the NRbs and formed a 1D assembly of straight single line or double linesby 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 showed 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 decreased as the addition of OAm increased, 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.