Shape Deformation in Ion Beam Irradiated Colloidal Monolayers: An AFM Investigation

Nanomaterials
Valeria LotitoStjepko Fazinić

Abstract

Self-assembly of colloidal monolayers represents a prominent approach to the fabrication of nanostructures. The modification of the shape of colloidal particles is essential in order to enrich the variety of attainable patterns which would be limited by the typical assembly of spherical particles in a hexagonal arrangement. Polymer particles are particularly promising in this sense. In this article, we investigate the deformation of closely-packed polystyrene particles under MeV oxygen ion irradiation at normal incidence using atomic force microscopy (AFM). By developing a procedure based on the fitting of particle topography with quadrics, we reveal a scenario of deformation more complex than the one observed in previous studies for silica particles, where several phenomena, including ion hammering, sputtering, chemical modifications, can intervene in determining the final shape due to the specific irradiation conditions. In particular, deformation into an ellipsoidal shape is accompanied by shrinkage and polymer redistribution with the presence of necks between particles for increasing ion fluence. In addition to casting light on particle irradiation in a regime not yet explored, we present an effective method for the charact...Continue Reading

References

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Jun 12, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Valeria Lotito, Tomaso Zambelli
Jul 16, 2019·Soft Matter·Virginia Carrasco-Fadanelli, Rolando Castillo

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Citations

Oct 1, 2020·Nanomaterials·Pei-Sung HungPu-Wei Wu
Sep 25, 2020·Advances in Colloid and Interface Science·Valeria Lotito, Tomaso Zambelli

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Methods Mentioned

BETA
scanning electron microscopy
atomic force microscopy
AFM

Software Mentioned

Bruker NanoScope Analysis
Matlab
SRIM

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