Self-assembly of protruding islands on spherical substrates by surface instability

Xiangbiao LIAO, Xi CHEN

Research output: Book Chapters | Papers in Conference ProceedingsConference paper (refereed)Referred Conference Paperpeer-review

Abstract

Through strain-induced morphological instability, protruding patterns of roughly commensurate nanostructures are selfassembled on the surface of spherical core/shell systems. A three-dimensional (3D) phase field model is established for closed substrate. We investigate both numerically and analytically the kinetics of the morphological evolution, from grooves to separated islands, which is sensitive to substrate curvature, misfit strain and modulus ratio between core and shell. The faster growth rate of surface undulation is associated with the core/shell system of harder substrate, larger radius or misfit strain. Based on a Ag core/SiO2 shell system, the self-assemblies of protruding SiO2 nano-islands are explored experimentally. The numerical and experimental studies herein could guide the fabrication of ordered quantum structures via surface instability on closed and curved substrates. Copyright © 2016 by ASME.
Original languageEnglish
Title of host publicationProceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition
PublisherAmerican Society of Mechanical Engineers(ASME)
Number of pages11
Volume14
ISBN (Print)9780791850688
DOIs
Publication statusPublished - 2016
Externally publishedYes
EventASME 2016 International Mechanical Engineering Congress and Exposition - Phoenix, United States
Duration: 11 Nov 201617 Nov 2016

Congress

CongressASME 2016 International Mechanical Engineering Congress and Exposition
Country/TerritoryUnited States
CityPhoenix
Period11/11/1617/11/16

Bibliographical note

X.C. acknowledges the support from the National Natural Science Foundation of China (11172231 and 11372241), ARPA-E (DEAR0000396) and AFOSR (FA9550-12-1- 0159); X.L. acknowledges the China Scholarship Council for the financial support.

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