Vapor-phase grafting of a model aminosilane compound to Al2O3, ZnO, and TiO2 surfaces prepared by atomic layer deposition
- Argonne National Lab. (ANL), Argonne, IL (United States); Advanced Materials for Energy-Water Systems (AMEWS), Energy Frontier Research Center (EFRC), Lemont, IL (United States); Univ. of Chicago, IL (United States)
- Advanced Materials for Energy-Water Systems (AMEWS), Energy Frontier Research Center (EFRC), Lemont, IL (United States); Univ. of Chicago, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Advanced Materials for Energy-Water Systems (AMEWS), Energy Frontier Research Center (EFRC), Lemont, IL (United States)
- Advanced Materials for Energy-Water Systems (AMEWS), Energy Frontier Research Center (EFRC), Lemont, IL (United States)
Atomic layer deposition (ALD) is a highly versatile surface functionalization technique that can conformally coat both planar and porous substrates. Here we use ALD metal oxide layers to establish a well-defined starting surface for vapor-phase surface organic modification. Vapor-phase (3-aminopropyl)triethoxysilane (APTES) surface silanization of ALD Al2O3, ZnO and TiO2 surfaces were studied at 100 °C, 150 °C and 200 °C. In situ quartz crystal microbalance (QCM) and Fourier-transform infrared (FTIR) spectroscopy measurements, and ex situ atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) measurements showed uniform monolayer silane formation through self-limiting APTES reaction. We observed a higher surface density of grafted APTES species following silanization at 100 °C compared to 200 °C, and we attribute this to the temperature-dependent reactivity of the surface hydroxyls and changes in the mode of APTES reaction. The FTIR and XPS measurements revealed that APTES reacts with Al2O3 and ZnO exclusively through metal siloxy bond formation. However, APTES reacts with TiO2 through both siloxy bond formation and ammonium salt formation via the amine group.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-06CH11357; NSF-DMR-14-20709
- OSTI ID:
- 1826066
- Journal Information:
- Applied Surface Science, Vol. 562; ISSN 0169-4332
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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