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Article

From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties

1
Institute for Materials Science, University of Stuttgart, 70569 Stuttgart, Germany
2
Institute of Physical Chemistry, University of Stuttgart, 70569 Stuttgart, Germany
3
Max Planck Institute for Polymer Research, 55128 Mainz, Germany
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2021, 11(1), 196; https://doi.org/10.3390/nano11010196
Received: 15 December 2020 / Revised: 8 January 2021 / Accepted: 10 January 2021 / Published: 14 January 2021
(This article belongs to the Special Issue Synthesis and Characterization of Nanostructured Templated Materials)
Oxide inverse opals (IOs) with their high surface area and open porosity are promising candidates for catalyst support applications. Supports with confined mesoporous domains are of added value to heterogeneous catalysis. However, the fabrication of IOs with mesoporous or sub-macroporous voids (<100 nm) continues to be a challenge, and the diffusion of tracers in quasi-mesoporous IOs is yet to be adequately studied. In order to address these two problems, we synthesized ZnO IOs films with tunable pore sizes using chemical bath deposition and template-based approach. By decreasing the size of polystyrene (PS) template particles towards the mesoporous range, ZnO IOs with 50 nm-sized pores and open porosity were synthesized. The effect of the template-removal method on the pore geometry (spherical vs. gyroidal) was studied. The infiltration depth in the template was determined, and the factors influencing infiltration were assessed. The crystallinity and photonic stop-band of the IOs were studied using X-Ray diffraction and UV-Vis, respectively. The infiltration of tracer molecules (Alexa Fluor 488) in multilayered quasi-mesoporous ZnO IOs was confirmed via confocal laser scanning microscopy, while fluorescence correlation spectroscopy analysis revealed two distinct diffusion times in IOs assigned to diffusion through the pores (fast) and adsorption on the pore walls (slow). View Full-Text
Keywords: inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy inverse opals; mesoporous materials; ZnO; diffusion in pores; fluorescence correlation spectroscopy
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MDPI and ACS Style

Kousik, S.R.; Sipp, D.; Abitaev, K.; Li, Y.; Sottmann, T.; Koynov, K.; Atanasova, P. From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties. Nanomaterials 2021, 11, 196. https://doi.org/10.3390/nano11010196

AMA Style

Kousik SR, Sipp D, Abitaev K, Li Y, Sottmann T, Koynov K, Atanasova P. From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties. Nanomaterials. 2021; 11(1):196. https://doi.org/10.3390/nano11010196

Chicago/Turabian Style

Kousik, Shravan R., Diane Sipp, Karina Abitaev, Yawen Li, Thomas Sottmann, Kaloian Koynov, and Petia Atanasova. 2021. "From Macro to Mesoporous ZnO Inverse Opals: Synthesis, Characterization and Tracer Diffusion Properties" Nanomaterials 11, no. 1: 196. https://doi.org/10.3390/nano11010196

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