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Issue 37, 2019
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Mesoporous ZnO thin films obtained from molecular layer deposited “zincones”

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Abstract

The delivery of porous ZnO thin films represents a challenge due to the low porosity achievable by conventional thin film deposition methods. In this contribution, the synthesis of mesoporous ZnO thin films is demonstrated through calcination in air of hybrid Zn-based polymers (zincone) obtained by molecular layer deposition (MLD). The calcination process was followed as a function of temperature using X-ray reflectivity and diffraction, together with spectroscopic ellipsometry. Temperature ranges were identified for the removal of the organic ligands (120 °C) and ZnO crystallization (340 °C). The total porosity and open porosity were also determined by ellipsometric porosimetry (EP) and grazing incidence small-angle X-ray scattering (GISAXS). The calcination temperature was identified as a control parameter for obtaining different (open) porosity contents and pore size distributions (PSDs). Open porosity values of 12.6% and 19.6% were obtained by calcining the zincones up to 600 °C and 400 °C, respectively. Open PSDs with a mean value of 3.2 nm (400 °C) and 4.6 nm (600 °C) were obtained. The formation of larger slit-shaped pores was demonstrated at higher temperatures, due to the growth and coalescence of ZnO crystallites.

Graphical abstract: Mesoporous ZnO thin films obtained from molecular layer deposited “zincones”

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Supplementary files

Article information


Submitted
08 Jul 2019
Accepted
28 Aug 2019
First published
28 Aug 2019

This article is Open Access

Dalton Trans., 2019,48, 14178-14188
Article type
Paper

Mesoporous ZnO thin films obtained from molecular layer deposited “zincones”

A. Perrotta, R. Berger, F. Muralter and A. M. Coclite, Dalton Trans., 2019, 48, 14178
DOI: 10.1039/C9DT02824B

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