Maiti Sonam, Maiti Santanu, Maier Andre, Banerjee Rupak, Shen Chen, Murphy Bridget M, Scheele Marcus, Schreiber Frank
Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany.
Chem Commun (Camb). 2019 Apr 18;55(33):4805-4808. doi: 10.1039/c9cc01758e.
We report on the in situ monitoring of the formation of conductive superlattices of Cu1.1S nanodiscs via cross-linking with semiconducting cobalt 4,4',4'',4'''-tetraaminophthalocyanine (CoTAPc) molecules at the liquid/air interface by real-time grazing incidence small angle X-ray scattering (GISAXS). We determine the structure, symmetry and lattice parameters of the superlattices, formed during solvent evaporation and ligand exchange on the self-assembled nanodiscs. Cu1.1S nanodiscs self-assemble into a two-dimensional hexagonal superlattice with a minor in-plane contraction (∼0.2 nm) in the lattice parameter. A continuous contraction of the superlattice has been observed during ligand exchange, preserving the initial hexagonal symmetry. We estimate a resultant decrement of about 5% in the in-plane lattice parameters. The contraction is attributed to the continuous replacement of the native oleylamine surface ligands with rigid CoTAPc. The successful cross-linking of the nanodiscs is manifested in terms of the high electrical conductivity observed in the superlattices. This finding provides a convenient platform to understand the correlation between the structure and transport of the coupled superstructures of organic and inorganic nanocrystals of anisotropic shape.
我们通过实时掠入射小角X射线散射（GISAXS），报道了在液/气界面处，通过与半导体钴4,4',4'',4'''-四氨基酞菁（CoTAPc）分子交联，原位监测Cu1.1S纳米盘导电超晶格的形成过程。我们确定了在自组装纳米盘上溶剂蒸发和配体交换过程中形成的超晶格的结构、对称性和晶格参数。Cu1.1S纳米盘自组装成二维六边形超晶格，晶格参数在面内有轻微收缩（约0.2 nm）。在配体交换过程中观察到超晶格的持续收缩，保持了初始的六边形对称性。我们估计面内晶格参数的最终减少约为5%。这种收缩归因于天然油胺表面配体被刚性CoTAPc持续取代。纳米盘的成功交联表现为在超晶格中观察到的高电导率。这一发现为理解各向异性形状的有机和无机纳米晶体耦合超结构的结构与传输之间的相关性提供了一个便利的平台。
