@misc{DelaneyZiminRahmetal., author = {Delaney, Tetyana L. and Zimin, Denys and Rahm, Michael and Weiss, Dieter and Wolfbeis, Otto S. and Mirsky, Vladimir M.}, title = {Capacitive detection in ultrathin chemosensors prepared by molecularly imprinted grafting photopolymerization}, series = {Analytical Chemistry}, volume = {79}, journal = {Analytical Chemistry}, number = {8}, issn = {0003-2700}, doi = {10.1021/ac062143v}, pages = {3220 -- 3225}, abstract = {The usual applications of capacitive detection in chemo- and biosensors are based on changes in effective thickness of insulating layers due to adsorption of analyte onto receptors. Ultrathin chemosensors based on molecularly imprinted polymerization enable a realization of another capacitive approach that exploits changes in electrical capacitance due to modification of the dielectric constant of the polymer. Such chemosensors were prepared by photografted molecularly imprinted polymerization on the surface of gold electrodes. An adsorbed layer of hydrophobic photoinitiator (benzophenone) provided grafted polymerization on the surface of the alkanethiol-modified gold electrode. The chemosensors were characterized by cyclic voltammetry, impedance spectroscopy, and scanning electron and atomic force microscopy. Binding of analyte was detected by measurements of electrical capacitance. The results indicate a decrease of the dielectric constant of the polymer layer due to analyte binding up to 20\%.}, language = {en} } @misc{KulikovMirskyDelaneyetal., author = {Kulikov, Valentin and Mirsky, Vladimir M. and Delaney, Tetyana L. and Donoval, Daniel and Koch, Alexander W. and Wolfbeis, Otto S.}, title = {High-throughput analysis of bulk and contact conductance of polymer layers prepared by combinatorial electropolymerization}, series = {Measurement Science and Technology}, volume = {16}, journal = {Measurement Science and Technology}, number = {1}, issn = {1361-6501}, doi = {10.1088/0957-0233/16/1/013}, pages = {95 -- 99}, abstract = {An approach for high-throughput analysis of bulk and contact conductance of polymer layers is described and evaluated. The approach, based on s24-technique (simultaneous two- and four-point conductance measurements), was realized as a high-throughput method and applied for investigation of conductive polymers on an array of interdigital platinum electrodes. Several examples demonstrate distinctive influence of combinatorially varied conditions of polymer synthesis (polymerization charge, content of copolymers) as well as chemical treatment of the synthesized polymers in bulk and contact resistance of metal/polymer/metal systems. The developed high-throughput s24-technique can be widely applied to material research for investigation of bulk and contact electrical properties.}, language = {en} }