Issue 33, 2019

In situ formation of electronically coupled superlattices of Cu1.1S nanodiscs at the liquid/air interface

Abstract

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.

Graphical abstract: In situ formation of electronically coupled superlattices of Cu1.1S nanodiscs at the liquid/air interface

Supplementary files

Article information

Article type
Communication
Submitted
04 Mar 2019
Accepted
25 Mar 2019
First published
25 Mar 2019

Chem. Commun., 2019,55, 4805-4808

In situ formation of electronically coupled superlattices of Cu1.1S nanodiscs at the liquid/air interface

S. Maiti, S. Maiti, A. Maier, R. Banerjee, C. Shen, B. M. Murphy, M. Scheele and F. Schreiber, Chem. Commun., 2019, 55, 4805 DOI: 10.1039/C9CC01758E

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