Journal
ACS NANO
Volume 8, Issue 4, Pages 4042-4052Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn5000223
Keywords
covalent organic frameworks (COFs); porous materials; thin films; interpenetrated systems
Categories
Funding
- NIM excellence cluster (DFG)
- Bavarian SolTech research network
- European Research Council under the European Union [321339]
- European Research Council (ERC) [321339] Funding Source: European Research Council (ERC)
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A mesoporous electron-donor covalent organic framework based on a benzodithiophene core, BDT-COF, was obtained through condensation of a benzodithiophene-containing diboronic acid and hexahydroxytriphenylene (HHTP). BDT-COF is a highly porous, crystalline, and thermally stable material, which can be handled in air. Highly porous, crystalline oriented thin BDT-COF films were synthesized from solution on different polycrystalline surfaces, indicating the generality of the synthetic strategy. The favorable orientation, crystallinity, porosity, and the growth mode of the thin BDT-COF films were studied by means of X-ray diffraction (XRD), 20 grazing incidence diffraction (GID), transmission and scanning electron microscopy (TEM, SEM), and krypton sorption. The highly porous thin BDT-COF films were infiltrated with soluble fullerene derivatives, such as [6,6]-phenyl C-61 butyric acid methyl ester (PCBM), to obtain an interpenetrated electron-donor/acceptor host-guest system. Light-induced charge transfer from the BDT-framework to PCBM acceptor molecules was indicated by efficient photoluminescence quenching. Moreover, we monitored the dynamics of photogenerated hole-polarons via transient absorption spectroscopy. This work represents a combined study of the structural and optical properties of highly oriented mesoporous thin (OF films serving as host for the generation of periodic interpenetrated electron-donor and electron-acceptor systems.
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