title: A multimodal optical and electrochemical device for monitoring surface reactions: redox active surfaces in porous silicon Rugate filters.
abstract: Herein, mesoporous silicon (PSi) is configured as a single sensing device that has dual readouts; as a photonic crystal sensor in a Rugate filter configuration, and as a high surface area porous electrode. The as-prepared PSi is chemically modified to provide it with stability in aqueous media and to allow for the subsequent coupling of chemical species, such as via Cu(I)-catalyzed cycloaddition reactions between 1-alkynes and azides ("click" reactions). The utility of the bimodal capabilities of the PSi sensor for monitoring surface coupling procedures is demonstrated by the covalent coupling of a ferrocene derivative, as well as by demonstrating ligand-exchange reactions (LER) at the PSi surface. Both types of reactions were monitored through optical reflectivity measurements, as well as electrochemically via the oxidation/reduction of the surface tethered redox species.
authors.affiliation: School of Chemistry and Australian Centre for Nanomedicine, University of New South Wales, Sydney 2052, Australia.
authors.forename: Simone
authors.initials: S
authors.lastname: Ciampi
authors.forename: Bin
authors.initials: B
authors.lastname: Guan
authors.forename: Nadim A
authors.initials: NA
authors.lastname: Darwish
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Reece
authors.forename: J Justin
authors.initials: JJ
authors.lastname: Gooding
mesh_terms: D000480:Alkynes / Q000737:chemistry; D001386:Azides / Q000737:chemistry; D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D005374:Filtration / Q000295:instrumentation*; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D016062:Porosity; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000480:Alkynes; D001386:Azides; D012825:Silicon