title: Defect-free polymer multilayers prepared via chemoselective immobilization.
abstract: In this paper, we investigated electrochemical properties of polymer multilayers on gold substrates using impedance spectroscopy. The multilayer was prepared by chemoselective ligation between aldehyde- and oxyamine-functionalized polymers via a layer-by-layer approach. The impedance spectra in a buffer solution in the absence of redox species revealed the formation of highly impermeable and defect-free films. The dielectric thickness of the polymer film, which is proportional to the reciprocal of capacitance, linearly increased as the number of deposition layer increased. The defect area of the polymer multilayer was obtained using the faradaic impedance with redox species. The surface coverage of eight polymer layers was determined to be 99.99%. Thus, the layer-by-layer deposition via chemoselective ligation offers a new way to prepare a highly insulating and defect-free polymer layer with finely tunable capacitance as a function of the number of deposition layers.
authors.affiliation: Department of Chemistry and The James Frank Institute, The University of Chicago, 929 E. 57th Street, Chicago, Illinois 60637, USA.
authors.forename: Mi-Kyoung
authors.initials: MK
authors.lastname: Park
authors.forename: Dong-Chan
authors.initials: DC
authors.lastname: Lee
authors.forename: Yongye
authors.initials: Y
authors.lastname: Liang
authors.forename: Gan
authors.initials: G
authors.lastname: Lin
authors.forename: Luping
authors.initials: L
authors.lastname: Yu
mesh_terms: D000588:Amines / Q000737:chemistry; D002627:Chemistry, Physical / Q000379:methods*; D017097:Electric Impedance; D004563:Electrochemistry / Q000379:methods*; D007659:Ketones; D008422:Materials Testing; D008567:Membranes, Artificial; D008956:Models, Chemical; D015233:Models, Statistical; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000588:Amines; D007659:Ketones; D008567:Membranes, Artificial; D011108:Polymers