Photoelectrochemical etching of silicon derivatized with an electroactive thiophene-terminated alkyl monolayer: toward a redox center-induced etching activation and anisotropy

Single-Component and Mixed Ferrocene-Terminated Alkyl Monolayers Covalently Bound to Si(111) Surfaces

“…The functionalization of self-assembled monolayers covalently bound to unoxidized single-crystal and porous silicon surfaces through long alkyl spacers constitutes an attractive approach for designing novel well-defined interfaces for numerous applications, such as molecular electronics, photovoltaic devices, and chemical/biological sensing. − The two principal methods for producing such functionalized monolayers use the reactions of hydrogen-terminated silicon surfaces with 1-alkenes ω -substituted either directly by functional moieties − or by reactive groups (acids or esters, − amines, ,− alcohols, ,,− and semicarbazides), which were subsequently converted to more complex organic or bioorganic structures. Unfortunately, the grafting conditions used in the first method are usually harsh and, consequently, are not applicable for numerous fragile functional structures.…”

“…Unfortunately, the grafting conditions used in the first method are usually harsh and, consequently, are not applicable for numerous fragile functional structures. In contrast, the second one involves often mild procedures (e.g., aminolysis) to attach the functionality after the grafting step and has been successfully applied to the attachment of numerous biological materials, such as DNA, ,,,,,, proteins, ,,,, and enzyme, organic polymers, − ,,, and polyoxometalates . Moreover, another advantage is that the functionalization step takes place on usually well-ordered monolayers while the one-step attachment of ω -substituted 1-alkenes can produce both less ordered and less passivating monolayers, particularly in the case where the ω -substituent is sterically hindered.…”

Photo- and electro-chromism of diarylethene modified ITO electrodes—towards molecular based read–write–erase information storage

“…In addition the contact angle of the surface decreases from 80u before irradiation to 58u after the four cycles. The decrease in the intensity of the redox wave of 1c-ITO over several cycles can be attributed to instability of the anchoring silyl group 17 of the dithienylethene switch on the surface due to the liberation of F 2 from the supporting electrolyte, rather than any inherent electrochemical instability of 1c. Indeed, this instability can be circumvented by using TBA(CF 3 SO 3 ) as the supporting electrolyte.…”