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Open AccessArticle

Directed Self-Assembly of Polystyrene Nanospheres by Direct Laser-Writing Lithography

1
Advanced Materials Metrology and Life Sciences Division, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, 10135 Torino, Italy
2
Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
3
Dipartimento di Scienze e Innovazione Tecnologica (DIST), Universitá del Piemonte Orientale “A. Avogadro”, INSTM, Viale T. Michel 11, 15121 Alessandria, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 280; https://doi.org/10.3390/nano10020280
Received: 24 December 2019 / Revised: 29 January 2020 / Accepted: 31 January 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Nanoscale Self-Assembly: Nanopatterning and Metrology)
In this work, we performed a systematic study on the effect of the geometry of pre-patterned templates and spin-coating conditions on the self-assembling process of colloidal nanospheres. To achieve this goal, large-scale templates, with different size and shape, were generated by direct laser-writer lithography over square millimetre areas. When deposited over patterned templates, the ordering dynamics of the self-assembled nanospheres exhibits an inverse trend with respect to that observed for the maximisation of the correlation length ξ on a flat surface. Furthermore, the self-assembly process was found to be strongly dependent on the height (H) of the template sidewalls. In particular, we observed that, when H is 0.6 times the nanospheres diameter and spinning speed 2500 rpm, the formation of a confined and well ordered monolayer is promoted. To unveil the defects generation inside the templates, a systematic assessment of the directed self-assembly quality was performed by a novel method based on Delaunay triangulation. As a result of this study, we found that, in the best deposition conditions, the self-assembly process leads to well-ordered monolayer that extended for tens of micrometres within the linear templates, where 96.2% of them is aligned with the template sidewalls. View Full-Text
Keywords: directed self-assembly; nanospheres lithography; colloidal nanospheres; direct laser-writing directed self-assembly; nanospheres lithography; colloidal nanospheres; direct laser-writing
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MDPI and ACS Style

Cara, E.; Ferrarese Lupi, F.; Fretto, M.; De Leo, N.; Tortello, M.; Gonnelli, R.; Sparnacci, K.; Boarino, L. Directed Self-Assembly of Polystyrene Nanospheres by Direct Laser-Writing Lithography. Nanomaterials 2020, 10, 280.

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