Molecular Structure of 3-Aminopropyltriethoxysilane Layers Formed on Silanol-Terminated Silicon Surfaces

Abstract

The use of the coupling agent, 3-aminopropyltriethoxysilane (APTES), in the silanization reaction with silanol-terminated silicon is an important surface modification reaction. Of particular importance is that the terminal amine functionalities of APTES are sufficiently exposed to the gas or liquid phase for further modifications, such as amide coupling reactions. Here, metastable induced electron spectroscopy (MIES) and UV photoelectron spectroscopy (UPS) were used to study the composition of the outermost layer of a silanol-terminated Si surface after silanization with APTES. High-resolution X-ray photoelectron spectroscopy (XPS) was used to validate the attachment of APTES to the surface. Density of States (DOS) calculations were employed for interpreting the MIE spectra. Findings showed that amine functionalities covered only a small fraction of the APTES-modified Si surface.

Ni/SiO2 catalyst prepared via Ni-aliphatic amine complexation for dry reforming of methane: Effect of carbon chain number and amine concentration

“…5(B), two N 1s peaks were shown at around 400.25 eV and 402.36 eV in NiSi-HEAm-015. 400.25 eV peak referred to -NH 2 groups in aliphatic amines and 402.36 eV peak referred to Hbonded -NH 2 terminal groups with silica [67,68]. This meant part of the -NH 2 terminal groups formed hydrogen bond with Si-OH silanol groups on the surface of silica support, which could enhance the metal-support interaction in NiSi-HEAm-015 (shown in TPR results).…”

Amino-functionalized silica magnetite nanoparticles for the simultaneous removal of pollutants from aqueous solution

“…APTES is the most commonly used for amino-functionalization of silica-based materials [22,23]. Attachment of APTES molecules was performed by silanization reaction.…”

Surface immobilization of functional molecules by reactive self‐assembling

“…These components were assigned to imide and thiadiazole groups and protonated imide group, respectively. [9,10] Also the XPS investigation of silane (Fig. 3d) revealed the presence of two components in the N 1s spectrum, localized at BE = 399.6 eV (1′′′) and 401.6 eV (2′′′) and assigned to amide or amine and protonated amide or amine groups, respectively.…”