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| - Photochemical Grafting and Activation of Organic Layers on GlassyCarbon and Pyrolyzed Photoresist Films
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| - Organic films have been grafted to polished glassy carbon (GC) and as-prepared pyrolyzed photoresist film (PPF)by photolysis of alkenes and an alkyne. The alkene or alkyne is spin-coated onto the carbon surface and photolyzedin air at 254 nm. Characterization by water contact angle measurements, depth profiling and surface roughnessmeasurements using atomic force microscopy (AFM), and electrochemistry reveal that for most modifiers a looselypacked monolayer is grafted to the surface. Grafted layers of 1-decene were further reacted by drop-coating with oxalylchloride and photolyzing at 254 nm in air. The procedure adds acid chloride groups to the film. Amines were attachedto these films via amide bond formation, and were characterized by electrochemistry and assembly of citrate-cappedgold nanoparticles. Amines were also coupled to photografted 1-undecylenic acid layers and to carboxyphenyl layersprepared by electroreduction of the corresponding diazonium salt. Quantitative analysis using electrochemistry establishedthat the highest concentration of amines was attached to the oxalyl chloride treated film, and that a higher concentrationof amines was attached via reaction with the photografted 1-undecylenic acid layer than the electrografted carboxyphenyllayer. Thus photografting and photoreaction with oxalyl chloride are simple methods for generating amine-reactivetethers on GC and PPF surfaces.
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