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Conformal and Highly Luminescent Monolayers of Alq3 Prepared by Gas-Phase Molecular Layer Deposition

Räupke, André and Albrecht, Fabian and Maibach, Julia and Behrendt, Andreas and Polywka, Andreas and Heiderhoff, Ralf and Helzel, Jonatan and Rabe, Torsten and Johannes, Hans-Hermann and Kowalsky, Wolfgang and Mankel, Eric and Mayer, Thomas and Görrn, Patrick and Riedl, Thomas (2014):
Conformal and Highly Luminescent Monolayers of Alq3 Prepared by Gas-Phase Molecular Layer Deposition.
In: ACS Applied Materials & Interfaces, ACS Publications, pp. 1193-1199, 6, (2), ISSN 1944-8244,
[Online-Edition: http://dx.doi.org/10.1021/am404918g],
[Article]

Abstract

The gas-phase molecular layer deposition (MLD) of conformal and highly luminescent monolayers of tris(8-hydroxyquinolinato)aluminum (Alq3) is reported. The controlled formation of Alq3 monolayers is achieved for the first time by functionalization of the substrate with amino groups, which serve as initial docking sites for trimethyl aluminum (TMA) molecules binding datively to the amine. Thereby, upon exposure to 8-hydroxyquinoline (8-HQ), the self-limiting formation of highly luminescent Alq3 monolayers is afforded. The growth process and monolayer formation were studied and verified by in situ quartz crystal monitoring, optical emission and absorption spectroscopy, and X-ray photoelectron spectroscopy. The nature of the MLD process provides an avenue to coat arbitrarily shaped 3D surfaces and porous structures with high surface areas, as demonstrated in this work for silica aerogels. The concept presented here paves the way to highly sensitive luminescent sensors and dye-sensitized metal oxides for future applications (e.g., in photocatalysis and solar cells).

Item Type: Article
Erschienen: 2014
Creators: Räupke, André and Albrecht, Fabian and Maibach, Julia and Behrendt, Andreas and Polywka, Andreas and Heiderhoff, Ralf and Helzel, Jonatan and Rabe, Torsten and Johannes, Hans-Hermann and Kowalsky, Wolfgang and Mankel, Eric and Mayer, Thomas and Görrn, Patrick and Riedl, Thomas
Title: Conformal and Highly Luminescent Monolayers of Alq3 Prepared by Gas-Phase Molecular Layer Deposition
Language: English
Abstract:

The gas-phase molecular layer deposition (MLD) of conformal and highly luminescent monolayers of tris(8-hydroxyquinolinato)aluminum (Alq3) is reported. The controlled formation of Alq3 monolayers is achieved for the first time by functionalization of the substrate with amino groups, which serve as initial docking sites for trimethyl aluminum (TMA) molecules binding datively to the amine. Thereby, upon exposure to 8-hydroxyquinoline (8-HQ), the self-limiting formation of highly luminescent Alq3 monolayers is afforded. The growth process and monolayer formation were studied and verified by in situ quartz crystal monitoring, optical emission and absorption spectroscopy, and X-ray photoelectron spectroscopy. The nature of the MLD process provides an avenue to coat arbitrarily shaped 3D surfaces and porous structures with high surface areas, as demonstrated in this work for silica aerogels. The concept presented here paves the way to highly sensitive luminescent sensors and dye-sensitized metal oxides for future applications (e.g., in photocatalysis and solar cells).

Journal or Publication Title: ACS Applied Materials & Interfaces
Volume: 6
Number: 2
Publisher: ACS Publications
Uncontrolled Keywords: molecular layer deposition, Alq3, surface functionalization, sensitized surfaces, gas-phase deposition
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 27 Feb 2015 09:44
Official URL: http://dx.doi.org/10.1021/am404918g
Identification Number: doi:10.1021/am404918g
Funders: We thank the German Federal Ministry for Education and Research (grant no. 13N11262) for financial support., P.G. acknowledges funding by the Emmy-Noether-Programm of the DFG (Deutsche Forschungsgemeinschaft).
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