Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 18, Pages 16041-16048Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03754
Keywords
aerogel; ceria; nanocrystal; sol-gel; ligand exchange
Funding
- European Regional Development Funds
- Spanish MINECO project SEHTOP [ENE2016-77798-C4-3-R]
- Spanish MINECO project TEMPTATION [MAT2016-79455-P]
- FI-AGAUR Research Fellowship Program, Generalitat de Catalunya [2015 FI_B 00744]
- People Programme (Marie Curie Actions) of the FP7 European Union Program (TECNIO) [600388]
- Agency for Business Competitiveness of the Government of Catalonia, ACCIO
- U.S. National Science Foundation [CHE-1361741]
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We present a novel method to produce crystalline oxide aerogels which is based on the cross-linking of preformed colloidal nanocrystals (NCs) triggered by propylene oxide (PO). Ceria and titania were used to illustrate this new approach. Ceria and titania colloidal NCs with tuned geometry and crystal facets were produced in solution from the decomposition of a suitable salt in the presence of oleylamine (OAm). The native surface ligands were replaced by amino acids, rendering the NCs colloidally stable in polar solvents. The NC colloidal solution was then gelled by adding PO, which gradually stripped the ligands from the NC surface, triggering a slow NC aggregation. NC-based metal oxide aerogels displayed both high surface areas and excellent crystallinity associated with the crystalline nature of the constituent building blocks, even without any annealing step. Such NC-based metal oxide aerogels showed higher thermal stability compared with aerogels directly produced from ionic precursors using conventional sol-gel chemistry strategies.
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