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Periodic nanoporous inorganic patterns directly made by self-ordering of cracks

Abstract : Solution-processed inorganic nanoporous films are key components for the vast spectrum of applications ranging from dew harvesting to solar cells. Shaping them into complex architectures required for advanced functionality, often need time-consuming or expensive fabrication. In this work, we show how crack formation is harnessed to pattern porous inorganic films in a single step and without using lithography. We developed aqueous ink formulations that, in the presence of polymeric latexes, enable evaporation-induced, defect-free periodic arrays of cracks with tunable dimensions over several centimeters. The ink formulation strategy was generalized to more than ten inorganic materials including simple and binary porous oxide and metallic films covering a whole spectrum of properties including insulator, photocatalytic, electrocatalytic, conductive or electrochromic materials. Notably, this approach enables three-dimensional self-assembly of cracks by stacking several layers of different compositions, yielding periodic assemblies of polygonal shapes and Janus-type patterns. The crack patterned periodic arrays of nanoporous TiO2 diffract light, and are used as temperature-responsive diffraction grating sensors. More broadly, this method represents a unique example of self-assembly process leading to long-range order (over several cm) in a robust and controlled way.
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https://hal.archives-ouvertes.fr/hal-03735804
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Submitted on : Wednesday, July 27, 2022 - 10:21:07 AM
Last modification on : Tuesday, September 20, 2022 - 11:15:10 AM

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Mateusz Odziomek, Fanny Thorimbert, Cedric Boissiere, Glenna L. Drisko, Stephane Parola, et al.. Periodic nanoporous inorganic patterns directly made by self-ordering of cracks. Advanced Materials, Wiley-VCH Verlag, 2022, 34 (36), pp.2204489. ⟨10.1002/adma.202204489⟩. ⟨hal-03735804⟩

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