Mondal Chandana, Khan Ali Hossain, Das Bidisa, Acharya Somobrata, Sengupta Surajit
1] Centre for Advanced Materials, Indian Association for the Cultivation of Science, 2A & 2B Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India [2].
Sci Rep. 2013;3:2612. doi: 10.1038/srep02612.
Self-assembled, one-dimensional (1D) nanomaterials are amenable building blocks for bottom-up nanofabrication processes. A current shortcoming in the self-assembly of 1D nanomaterials in solution phase is the need for specific linkers or templates under very precise conditions to achieve a handful of systems. Here we report on the origin of a novel self-assembly of 1D dumbbells consisting of Au tipped PbS nanorods into stable chains in solution without any linkers or templates. A realistic multi-particle model suggests that the mesophase comprises 1D dumbbells arrayed in chains formed by anisotropic van der Waals type interactions. We demonstrate an alternative recognition mechanism for directing the assembly of the 1D dumbbells, based on effective interaction between the neighboring dumbbells consisting of Au tips with complementary crystallographic facets that guides the entire assembly in space.
自组装的一维（1D）纳米材料是用于自下而上纳米制造工艺的理想构建块。目前，溶液相中一维纳米材料自组装的一个缺点是，需要在非常精确的条件下使用特定的连接剂或模板才能实现少数几个体系。在此，我们报告了一种由金端硫化铅纳米棒组成的一维哑铃在溶液中无需任何连接剂或模板就能自组装成稳定链的新机制。一个实际的多粒子模型表明，中间相由通过各向异性范德华力相互作用排列成链的一维哑铃组成。我们基于由具有互补晶体学面的金端组成的相邻哑铃之间的有效相互作用，展示了一种用于指导一维哑铃组装的替代识别机制，该相互作用在空间中引导整个组装过程。
