Metal Nanoparticle/Block Copolymer Composite Assembly and Disassembly.
Metal Nanoparticle/Block Copolymer Composite Assembly and Disassembly.
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DOI：
10.1021/cm9020673
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发表时间：
2009
影响因子：
8.6
通讯作者：
Wiesner, Ulrich
中科院分区：
文献类型：
--
作者：
Li, Zihui;Sai, Hiroaki;Warren, Scott C.;Kamperman, Marleen;Arora, Hitesh;Gruner, Sol M.;Wiesner, Ulrich
将配体稳定的铂纳米粒子（Pt NPs）与聚（异戊二烯-嵌段-甲基丙烯酸二甲氨基乙酯）（PI-b-PDMAEMA）嵌段共聚物自组装，制备了有机-无机杂化材料。通过使用N，N-二-（2-（烯丙氧基）乙基）-N-3-巯基丙基-N-3-甲基氯化铵作为配体实现了杂化物中NP的高负载，这提供了NP在各种溶剂中的高溶解度以及对PDMAEMA的高亲和力。从NP合成，通过高角度环形暗场扫描透射电子显微镜（HAADF-STEM）图像证实了亚1 nm Pt NP的存在。基于HAADF-STEM图像和热重分析（TGA）数据的Pt NP配体头基密度的估计产生了与平坦Pt {111}表面上的烷醇聚醚自组装单层（SAM）所发现的结果相当的结果。改变嵌段共聚物-NP复合材料中Pt NPs的体积分数，得到具有球形胶束、蠕虫状胶束、层状和反六方形貌的杂化物。具有球形、蠕虫状胶束和层状形态的杂化物的聚合分别产生孤立的基于金属-NP的纳米球、圆柱体和片。结果表明，存在强大的设计标准，从设计师封锁的大分子形成的金属基纳米结构。
Ligand-stabilized platinum nanoparticles (Pt NPs) were self-assembled with poly(isoprene-block-dimethylaminoethyl methacrylate) (PI-b-PDMAEMA) block copolymers to generate organic-inorganic hybrid materials. High loadings of NPs in hybrids were achieved through usage of N,N-di-(2-(allyloxy)ethyl)-N-3-mercaptopropyl-N-3-methylammonium chloride as the ligand, which provided high solubility of NPs in various solvents as well as high affinity to PDMAEMA. From NP synthesis, existence of sub-1 nm Pt NPs was confirmed by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) images. Estimations of the Pt NP ligand head group density based on HAADF-STEM images and thermogravimetric analysis (TGA) data yielded results comparable to what has been found for alkanethiol self-assembled monolayers (SAMs) on flat Pt {111} surfaces. Changing the volume fraction of Pt NPs in block copolymer-NP composites yielded hybrids with spherical micellar, wormlike micellar, lamellar and inverse hexagonal morphologies. Disassembly of hybrids with spherical, wormlike micellar, and lamellar morphologies generated isolated metal-NP based nano-spheres, cylinders and sheets, respectively. Results suggest the existence of powerful design criteria for the formation of metal-based nanostructures from designer blocked macromolecules.
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影响因子：
5.5
作者：
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通讯作者：
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作者：
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