Photoinitiated Transformation of Nanocrystal Superlattice Polymorphs Assembled at a Fluid Interface

Gao, Yingjie; Huang, Jen‐Yu; Balazs, Daniel M.; Xu, Yuanze; Hanrath, Tobias

doi:10.1002/admi.202001064

Photoinitiated Transformation of Nanocrystal Superlattice Polymorphs Assembled at a Fluid Interface

Journal Article · Mon Sep 21 00:00:00 EDT 2020 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.202001064· OSTI ID:1804216

Gao, Yingjie ^[1]; Huang, Jen‐Yu ^[1]; Balazs, Daniel M. ^[1]; Xu, Yuanze ^[1]; ^[1]

Robert F. Smith School of Chemical and Biomolecular Engineering Cornell University Ithaca NY 14853 USA

Abstract

Directing the assembly of nanoscale building blocks into programmable superstructures is of broad scientific and technological interest. Advances in nanocrystal self‐assembly at fluid interfaces are combined with digital light processing to demonstrate that how the extent and spatial region of superlattice structure transformation can be controlled. It is shown that the addition of a photoacid generator to the fluid subphase provides new experimental degrees of freedom to modulate the dynamic equilibrium of ligands bound to the colloidal nanocrystal surface. Within the photoexposed regions, the nanocrystal ligand coverage is reduced which impacts the interactions between proximate nanocrystals and drives the transformation from a sixfold to a fourfold symmetric superlattice. Structural analysis is presented from transmission electron microscopy and chemical analysis is presented from infrared spectroscopy to establish the relationship between superlattice structure and ligand coverage. Beyond new insights understanding of and control over deprotection of colloidal nanocrystals at fluid interfaces, the processing method described in this work presents new opportunities to create nanocrystal assemblies with spatially programmable structures.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0018026

OSTI ID:: 1804216

Alternate ID(s):: OSTI ID: 1852469

Journal Information:: Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 21 Vol. 7; ISSN 2196-7350

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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