Cooperative particle rearrangements facilitate the self-organized growth of colloidal crystal arrays on strain-relief patterns

Mondal, M and Mishra, CK and Banerjee, R and Narasimhan, S and Sood, AK and Ganapathy, R (2020) Cooperative particle rearrangements facilitate the self-organized growth of colloidal crystal arrays on strain-relief patterns. In: Science Advances, 6 (10).

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Abstract

Strain-relief pattern formation in heteroepitaxy is well understood for particles with long-range attraction and is a routinely exploited organizational principle for atoms and molecules. However, for particles with short-range attraction such as colloids and nanoparticles, which form brittle assemblies, the mechanism(s) of strain-relief is not known. Here, we found that for colloids with short-range attraction, monolayer films on substrates with square symmetry could accommodate large compressive misfit strains through locally dewetted hexagonally ordered stripes. Unexpectedly, over a window of compressive strains, cooperative particle rearrangements first resulted in a periodic strain-relief pattern, which then guided the growth of laterally ordered defect-free colloidal crystals. Particle-resolved imaging of monomer dynamics on strained substrates also helped uncover cooperative kinetic pathways for surface transport. These processes, which substantially influenced the film morphology, have remained unobserved in atomic heteroepitaxy studies hitherto. Leaning on our findings, we developed a heteroepitaxy approach for fabricating hierarchically ordered surface structures.

Item Type:	Journal Article
Publication:	Science Advances
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Additional Information:	The copyright of this article belongs to AMER ASSOC ADVANCEMENT SCIENCE
Keywords:	Crystals; Epitaxial growth; Morphology, Colloidal crystal arrays; Colloidal crystals; Compressive strain; Organizational principles; Particle rearrangement; Self organized growth; Short-range attraction; Strained substrates, Strain
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	31 Aug 2020 06:30
Last Modified:	31 Aug 2020 06:30
URI:	http://eprints.iisc.ac.in/id/eprint/65082

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