Duan Hanyi, Malesky Tessa, Wang Janet, Liu Chung-Hao, Tan Haiyan, Nieh Mu-Ping, Lin Yao, He Jie
Polymer Program, University of Connecticut, Storrs, CT 06269, USA.
Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
Nanoscale. 2022 May 19;14(19):7364-7371. doi: 10.1039/d2nr01221a.
We report a new design of polymer-patched gold nanoparticles (AuNPs) with controllable interparticle interactions in terms of their direction and strength. Patchy AuNPs (pAuNPs) are prepared through hydrophobicity-driven surface dewetting under deficient ligand exchange conditions. Using the exposed surface on pAuNPs as seeds, a highly controllable growth of AuNPs is carried out seed-mediated growth while retaining the size of polymer domains. As guided by ligands, these pAuNPs can self-assemble directionally in two ways along the exposed surface (head-to-head) or the polymer-patched surface of pAuNPs (tail-to-tail). Control of the surface asymmetry/coverage on pAuNPs provides an important tool in balancing interparticle interactions (attraction repulsion) that further tunes assembled nanostructures as clusters and nanochains. The self-assembly pathway plays a key role in determining the interparticle distance and therefore plasmon coupling of pAuNPs. Our results demonstrate a new paradigm in the directional self-assembly of anisotropic building blocks for hierarchical nanomaterials with interesting optical properties.
我们报道了一种新型的聚合物修饰金纳米颗粒（AuNPs）设计，其粒子间相互作用在方向和强度方面具有可控性。通过在配体交换不足的条件下由疏水性驱动的表面去湿来制备修饰金纳米颗粒（pAuNPs）。以pAuNPs上暴露的表面为种子，在保留聚合物域尺寸的同时，通过种子介导生长实现了AuNPs的高度可控生长。在配体的引导下，这些pAuNPs可以沿着暴露表面（头对头）或pAuNPs的聚合物修饰表面（尾对尾）以两种方式定向自组装。控制pAuNPs上的表面不对称性/覆盖率为平衡粒子间相互作用（吸引与排斥）提供了一个重要工具，这进一步调整了作为簇和纳米链的组装纳米结构。自组装途径在决定粒子间距离以及因此决定pAuNPs的等离子体耦合方面起着关键作用。我们的结果展示了一种用于具有有趣光学性质的分级纳米材料的各向异性构建块定向自组装的新范例。
