Oriented Thin Films of Electroactive Triphenylene Catecholate-Based Two-Dimensional Metal-Organic Frameworks.

Autor: Mähringer A; Department of Chemistry , Ludwig-Maximilians-Universität (LMU) , Butenandtstr. 11 (E) , 81377 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Jakowetz AC; Department of Chemistry , Ludwig-Maximilians-Universität (LMU) , Butenandtstr. 11 (E) , 81377 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Rotter JM; Department of Chemistry , Ludwig-Maximilians-Universität (LMU) , Butenandtstr. 11 (E) , 81377 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Bohn BJ; Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics , Ludwig-Maximilians-Universität (LMU) , Königinstr. 10 , 80539 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Stolarczyk JK; Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics , Ludwig-Maximilians-Universität (LMU) , Königinstr. 10 , 80539 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Feldmann J; Chair for Photonics and Optoelectronics, Nano-Institute Munich, Department of Physics , Ludwig-Maximilians-Universität (LMU) , Königinstr. 10 , 80539 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Bein T; Department of Chemistry , Ludwig-Maximilians-Universität (LMU) , Butenandtstr. 11 (E) , 81377 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany., Medina DD; Department of Chemistry , Ludwig-Maximilians-Universität (LMU) , Butenandtstr. 11 (E) , 81377 Munich , Germany.; Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS) , Schellingstr. 4 , 80799 Munich , Germany.
Jazyk: angličtina
Zdroj: ACS nano [ACS Nano] 2019 Jun 25; Vol. 13 (6), pp. 6711-6719. Date of Electronic Publication: 2019 Jun 04.
DOI: 10.1021/acsnano.9b01137
Abstrakt: Two-dimensional triphenylene-based metal-organic frameworks (TP-MOFs) attract significant scientific interest due to their long-range order combined with significant electrical conductivity. The deposition of these structures as oriented films is expected to promote their incorporation into diverse optoelectronic devices. However, to date, a controlled deposition strategy applicable for the different members of this MOF family has not been reported yet. Herein, we present the synthesis of highly oriented thin films of TP-MOFs by vapor-assisted conversion (VAC). We targeted the M-CAT-1 series comprising hexahydroxytriphenylene organic ligands and metal-ions such as Ni 2+ , Co 2+ , and Cu 2+ . These planar organic building blocks are connected in-plane to the metal-ions through a square planar node forming extended sheets which undergo self-organization into defined stacks. Highly oriented thin Ni- and Co-CAT-1 films grown on gold substrates feature a high surface coverage with a uniform film topography and thickness ranging from 180 to 200 nm. The inclusion of acid modulators in the synthesis enabled the growth of films with a preferred orientation on quartz and on conductive substrates such as indium-doped tin oxide (ITO). The van der Pauw measurements performed across the M-CAT-1 films revealed high electrical conductivity values of up to 10 -3 S cm -1 for both the Ni- and Co-CAT-1 films. Films grown on quartz allowed for a detailed photophysical characterization by means of UV-vis, photoluminescence, and transient absorption spectroscopy. The latter revealed the existence of excited states on a nanosecond time scale, sufficiently long to demonstrate a photoinduced charge generation and extraction in Ni-CAT-1 films. This was achieved by fabricating a basic photovoltaic device with an ITO/Ni-CAT-1/Al architecture, thus establishing this MOF as a photoactive material. Our results point to the intriguing capabilities of these conductive M-CAT-1 materials and an additional scope of applications as photoabsorbers enabled through VAC thin-film synthesis.
Databáze: MEDLINE
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