@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{HaoRahmWeissetal., author = {Hao, Qingli and Rahm, Michael and Weiss, Dieter and Mirsky, Vladimir M.}, title = {Morphology of electropolymerized poly (N-methylaniline) films}, series = {Microchimica Acta}, volume = {143}, journal = {Microchimica Acta}, number = {2}, issn = {0026-3672}, doi = {10.1007/s00604-003-0063-8}, pages = {147 -- 153}, abstract = {The influence of polymerization conditionson the morphology of thin films of poly-(N-methylani-line) (PNMA) was studied. The films were prepared byelectropolymerization on gold and platinum electrodesand studied by optical and electron microscopy. It wasdemonstrated that the film morphology does notdepend on the polymerization rate or on the electrodemetal.However,itissensitivetothekindofcounterionofPNMA.Thepolymerscontainingacetate orchloridedo not form stable films. Polymer films containingphosphate or sulfate display inhomogeneous struc-tures. A formation of sprouts and ''nanotubes'' wasobserved for PNMA sulfate. The films formed byPNMA perchlorate are smooth and transparent(glass-likestructure).Asublayerof4-aminothiophenolincreases the adhesion of polymers to the gold surface.}, language = {en} }