Grafting of diazonium salts on oxides surface: formation of aryl-O bonds on iron oxide nanoparticles

Abstract

Combining ab initio modelling and 57 Fe Mössbauer spectrometry, we characterized the nature of the chemical linkage of aminoalkyl arenediazonium salt on the surface of iron oxide nanoparticles. We established that it is built through a metal-oxygen-carbon bonding and not a metal-carbon one, as usually suggested and commonly observed in previously studied metal or carbon-based surfaces.

Surface modification of CoCr alloys by electrochemical reduction of diazonium salts

“…43 The latter three peaks are likely due to adventitious carbon-based contaminants usually found on surfaces exposed to atmosphere. 25 The Cr 0 /Cr 3+ ratio decreased signicantly from 0.6 AE 0.1 for CoCr À0.5 V to 0.3 AE 0.05, and to 0.03 AE 0.01 for CoCr OCP and CoCr 1 V respectively (Fig. 2D).…”

“…9,10,20 For instance, XPS, Raman and time-of-ight secondary ion mass spectrometry (ToF-SIMS) analysis revealed the existence of both M-O-C (metal-oxide-aryl) and M-C (metal-aryl) bonds on Cu, 21 Al 22 and Mn 23 oxides, and only M-O-C on Cr 24 and Fe oxides. 25 Other authors reported aryl diazonium graing onto indium tin oxide (ITO), 8 uorine tin oxide (FTO), 26 and stainless steel, 27 but did not discuss the type of bonds involved.…”

Biocompatibility and Durability of Diazonium Adhesives on Dental Alloys

“…Unfortunately, such bond is very difficult to identify by XPS. 34 The observation of the carbide bond could be related the difference in the integrity of the oxide layer of the dental alloys in our experimental conditions (i.e., pH, immersion time, PPD concentration). Based on Pilling-Bedworth theory, 35 if the P-B ratio of the oxide layer covering an alloy is <1, the oxide layer is too thin to have a protective effect, if the P-B ratio is between 1 and 2, then the oxide layer is most protective and when the P-B ratio is >2, the oxide layer can chip off and expose the metal beneath.…”

“…In contrast, no such peak was detected on Ti suggesting the formation of a M‐O‐C bond between PPD and the alloys. Unfortunately, such bond is very difficult to identify by XPS . The observation of the carbide bond could be related the difference in the integrity of the oxide layer of the dental alloys in our experimental conditions (i.e., pH, immersion time, PPD concentration).…”

“…carbide), or both. For example, both M‐O‐C and M‐C bonds were observed on Cu, Al, and Mn oxides while only M‐O‐C bonds was detected on Cr and Fe oxides.…”