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Organic surface modification and analysis of titania nanoparticles for self‐assembly in multiple layers
Author(s) -
Hodoroaba VasileDan,
Rades Steffi,
Borghetti Patrizia,
Ortel Erik,
Wirth Thomas,
García Sarai,
Gómez Estíbaliz,
Blanco Miren,
Alberto Gabriele,
Martra Gianmario
Publication year - 2020
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6842
Subject(s) - triethoxysilane , surface modification , thermogravimetric analysis , fourier transform infrared spectroscopy , x ray photoelectron spectroscopy , materials science , nanoparticle , chemical engineering , auger electron spectroscopy , silane , scanning electron microscope , polymer chemistry , nanotechnology , physics , nuclear physics , engineering , composite material
The characteristics of TiO 2 coatings can greatly influence their final performance in large‐scale applications. In the present study, self‐assembly of TiO 2 nanoparticles (NPs) in multiple layers was selected as a deposition procedure on various substrates. For this, the main prerequisite constitutes the surface modification of both NPs and substrate with, for example, silane coupling agents. A set of functionalized TiO 2 NPs has been produced by reaction with either (3‐aminopropyl)triethoxysilane (APTES) or (3‐aminopropyl)phosphonic acid (APPA) to functionalize the NP surface with free amino‐groups. Then, the complementary functionalized NP set can be obtained from an aliquot of the first one, through the conversion of free surface amino groups to aldehydes by reaction with glutaraldehyde (GA). Several types of TiO 2 NPs differing in size, shape, and specific surface area have been functionalized. Fourier‐transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), SEM/ energy‐dispersive X‐ray spectroscopy (EDS), XPS, Auger electron spectroscopy (AES), and Time‐of‐Flight (ToF)‐SIMS analyses have been carried out to evaluate the degree of functionalization, all the analytical methods employed demonstrating successful functionalization of TiO 2 NP surface with APTES or APPA and GA.