支链淀粉衍生物调节的层状结构四边形银纳米片的一步合成,ACS Omega

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支链淀粉衍生物调节的层状结构四边形银纳米片的一步合成
ACS Omega ( IF 3.7 ) Pub Date : 2018-06-25 00:00:00 , DOI: 10.1021/acsomega.8b00833
Bo Pang ₁ , Robert Köhler ₂ , Vladimir Roddatis ₃ , Huan Liu ₁ , Xiaohui Wang ₄ , Wolfgang Viöl ₂ , Kai Zhang ₁

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具有官能团的聚合物或小分子一直被用来合成二维（2D）银纳米结构，但多糖及其衍生物很少用于其制备，更不用说均匀的四边形形状了。在此，含有浓缩羧基的支链淀粉衍生物首次用于合成具有层状结构的均匀二维四边形银纳米片（QAgNP）。作为一种天然的超支化多糖，支链淀粉用 10-十一烯酰氯酯化，然后通过硫醇-烯点击化学进行修饰，引入大量和高密度的羧基。然后，在水-四氢呋喃二元系统中，在所得支链淀粉 11-((3-羧基)乙硫基)十一酸酯 (APUE ₃ -MPA)存在下，通过紫外光还原合成 QAgNP 。QAgNPs 显示出新颖的均匀四边形形状和层状结构，这已通过其广角 X 射线散射图案得到证实。平均层间距离约为 1.3 nm，而 QAgNP 的平均边缘长度在 0.29 ± 0.07 和 1.09 ± 0.25 μm 之间变化。_{APUE 3} -MPA的浓度和反应体系中的水量强烈影响 QAgNPs 的形状。因此，反应体系和大量羧基的排列是层状结构QAgNPs形成的关键因素。

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One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

Polymers or small molecules with functional groups were always employed to synthesize two-dimensional (2D) silver nanostructures, but the polysaccharides and derivatives have rarely been used for their preparation, let alone of uniform quadrilateral shapes. Herein, amylopectin derivatives containing concentrated carboxyl groups were first used for the synthesis of uniform 2D quadrilateral silver nanoplates (QAgNPs) with lamellar structure. As a native hyperbranched polysaccharide, amylopectin was esterified with 10-undecenoyl chloride and then modified via thiol–ene click chemistry to introduce high amount and high density of carboxyl groups. Then, QAgNPs were synthesized via UV photoreduction in the presence of the resultant amylopectin 11-((3-carboxyl)ethylthio)undecanoate (APUE₃-MPA) in water–tetrahydrofuran binary system. QAgNPs showed novel uniform quadrilateral shapes with lamellar structure, as verified by their wide-angle X-ray scattering patterns. The average interlayer distance was around 1.3 nm, whereas the average edge lengths of QAgNPs varied between 0.29 ± 0.07 and 1.09 ± 0.25 μm. The concentration of APUE₃-MPA and the amount of water in the reaction system strongly affected the shapes of QAgNPs. Thus, the reaction system and the arrangement of numerous carboxyl groups were the key factors for the formation of lamellar-structured QAgNPs.

更新日期：2018-06-25

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