ω‐substituted long chain alkylphosphonic acids – their synthesis and deposition on metal oxides and subsequent functional group conversion of the deposited compounds

Abstract

The crystal structure and the surface of alumina layers on silicon wafers were investigated by means of GIWAXS, WAXS, and AFM. Self‐assembled monolayers of ω‐substituted long‐chain alkylphosphonic acids were deposited on alumina and the layer thickness and homogeneity were determined by ellipsometry revealing a dependency of thickness and homogeneity on the nature of the substituent. During the adsorption process surface etching by the phosphonic acid was observed causing an increase in surface roughness.Furthermore, ex post functional group conversions were carried out yielding surface bound azides and rhodanides.

Organophosphonates as anchoring agents onto metal oxide-based materials: synthesis and applications

“…The graing of alkylphosphonic acids or derivatives has been widely described in the literature. [16][17][18][19][20] These molecules are made by a linear alkyl chain bearing a phosphonic acid group as chain end (CH 3 (CH 2 ) n P(O)(OH) 2 ). Aer graing, the obtained hybrid material got new properties such as hydrophobicity or corrosion resistance.…”

“…Guerrero et al 41 identied bidentate species (19 ppm) but mainly highlighted tridentate bonding mode since they applied harsh graing conditions. 17 O NMR spectroscopy was also an interesting tool to study the chemical bonding but required 17 O enriched acid which is the main drawback of this technique. Two research teams 42,44 showed the possibility to distinguish P]O, P-O-H, P-O-Ti and TiO x bonds by this technique.…”

In Situ Study of the Deposition of (Ultra)thin Organic Phosphonic Acid Layers on the Oxide of Aluminum

“…In this work, we will focus on the adsorption of phosphonic acids on aluminum oxides. Although some reports exist on the formation of SAMs of phosphonic acids on the oxide of iron, silicon, , zirconium, and titanium, most of the work has been performed on aluminum oxide. Phosphonic acids bind with aluminum hydroxyl groups through an acid–base condensation elimination reaction .…”

Study of the Self-Assembling of n-Octylphosphonic Acid Layers on Aluminum Oxide

“…Alkylphosphonic acids have been shown to assemble on a number of oxide surfaces, such as tantalum oxides, aluminum oxides, silicon oxides, stainless steel oxides, and mica. [13][14][15][16][17][18][19][20][21][22][23][24] The phosphonic acids are mostly deposited from an organic or water-diluted (10 -3 mol/L) solution. It is known that the phosphonic acids interact with the aluminum hydroxyl groups, where an increase in the amount of surface hydroxyls enhances the phosphonic acid deposition.…”