Electrochemical and Surface Characterization of Dense Monolayers Grafted on ITO and Si/SiO₂ Surfaces via Tetra(tert‐Butoxy)Tin Linker

Abstract

Indium tin oxide (ITO) and silicon with a thermally grown SiO2 layer (Si/SiO2) substrates have been functionalized by ferrocene bound through Sn(O)x (x=2 or 3) linkers preliminarly grafted on the surface by reaction of the terminal hydroxyl groups with tetra(tert‐butoxy)tin. The two steps modification of the surface was carried out by chemical vapour deposition metathesis reaction producing a self‐assembled monolayer of ferrocene. The ITO and Si/SiO2 thus functionalized have been characterized by voltammetric, amperometric, electrochemical impedance spectroscopy and scanning probe microscopy techniques which assessed the formation of a stable and rather compact covalently bound ferrocenyl monolayer with improved electron transfer properties.

Thiahelicene-based inherently chiral films for enantioselective electroanalysis

“…Samples for the AFM experiments were prepared by depositing the oligomeric film through electrochemical polymerization, of either a ACN or DCM monomer solution, on ultra-flat ITO (uflat-ITO), with a sheet resistance of 7 Ω sq –1 , RMS roughness of about 0.6 nm (1 × 1 μm 2 ), provided by Kuramoto Co. (Kurihara, Japan). The images were obtained by optimizing the setpoint tapping amplitude with respect to the free amplitude of the probe, near the resonance frequency of the probe itself, as reported elsewhere 47. The thickness of the deposit was evaluated by scratching an area of the deposit with the AFM tip by applying a minimum constant force (130 nN) in contact mode and subsequently performing the imaging of the selected surface part in tapping mode.…”

Electrostatic Force Triggering Elastic Condensation of Double-Stranded DNA for High-Performance One-Step Immunoassay

“…The TEM image showed that the prepared AuNPs were nearly monodisperse spheres with an average size of about 14 nm (Figure S1-B) and an average hydrodynamic diameter of ∼21 nm (Figure S1-C). However, the absorption peak of AbFc@AuNPs appeared at 528 nm (Figure S1-A, curve b), which most likely resulted from a change in the dielectric property of the media surrounding the AuNPs, , demonstrating the successful comodification of Fc and antibody on the AuNP surface.…”

Research advances in the synthesis and applications of ferrocene‐based electro and photo responsive materials

“…Petrizza et al . developed a self‐assembled monolayer of ferrocene‐based on two steps modification of the surface . It was carried out with the help of vapor deposition metathesis reaction.…”

“…The resultant product carried a homogeneous robust and densely packed electro responsive monolayer. This system can be used to explore in the area of sensing and optoelectronic devices (Figure ) …”

“…Pictorial representation of the surface modification of both ITO and Si/SiO 2 with tetra (tertbutoxy) tin, and the grafting process to obtain the ferrocene derivative. Adopted with permission from ref Copyright 2016, Wiley Online Library…”