Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 2, Pages 1193-1199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am404918g
Keywords
molecular layer deposition; Alq(3); surface functionalization; sensitized surfaces; gas-phase deposition
Funding
- German Federal Ministry for Education and Research [13N11262]
- Emmy-Noether-Programm of the DFG (Deutsche Forschungsgemeinschaft)
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The gas-phase molecular layer deposition (MLD) of conformal and highly luminescent monolayers of tris(8-hydroxyquinolinato)aluminum (Alq(3)) is reported. The controlled formation of Alq(3) 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 Alq(3) 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).
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