Wang Luyan, Chen Xiao, Zhan Jie, Chai Yongcun, Yang Chunjie, Xu Limei, Zhuang Wenchang, Jing Bo
Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
J Phys Chem B. 2005 Mar 3;109(8):3189-94. doi: 10.1021/jp0449152.
Single-crystalline gold nano- and microplates with triangular or hexagonal shapes are synthesized by reduction of HAuCl(4) in lyotropic liquid crystal (LLC) mainly made of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers and water after adding a small amount of capping agents, cetyltrimethylammonium bromide (CTAB) or tetrabutylammonium bromide (TBAB). During the growth of such plates, capping agents play the crucial role. It is found that there is an optimal value of CTAB or TBAB concentration for producing microplates. The selective adsorption of CTAB or TBAB on certain crystallographic facets may be the key point of the supposed mechanism. Although LLC does not really act as a template, it provides an ordered structure confining CTAB as well as the nascent metal nuclei, which enhances the oriented attachment of nuclei and thus the consequent growth of single-crystal plates.
通过在主要由聚环氧乙烷-聚环氧丙烷-聚环氧乙烷嵌段共聚物和水组成的溶致液晶（LLC）中加入少量封端剂十六烷基三甲基溴化铵（CTAB）或四丁基溴化铵（TBAB）后还原 HAuCl₄，合成了具有三角形或六边形形状的单晶金纳米板和微米板。在这些板的生长过程中，封端剂起着关键作用。发现存在一个用于生产微米板的 CTAB 或 TBAB 浓度的最佳值。CTAB 或 TBAB 在某些晶面上的选择性吸附可能是假定机制的关键点。尽管 LLC 实际上并不充当模板，但它提供了一种有序结构，限制了 CTAB 以及新生的金属核，这增强了核的定向附着，从而促进了单晶板的后续生长。
