title: "Click" Incorporation of Radical/Ionic Sites into a Reactive Block Copolymer: A Facile and On-Demand Domain Functionalization Approach toward Organic Resistive Memory.
abstract: Reversible addition-fragmentation chain transfer polymerization yields reactive block copolymers bearing the pentafluorophenyl ester (PFPA) group, and subsequent Click amidation using 2,2,6,6-tetramethylpiperidine-N-oxyl- and imidazolium-functionalized primary amines produces the corresponding functional block copolymers, leading to installation of statistical radical- and ionic sites into the PFPA segment. The monolayered thin film devices fabricated using the obtained block copolymers exhibit repeatable switching of electric conductivity (on/off ratio > 103) under a bias voltage, which reveals that the coexistence of radicals and ions in the same spherical domain of the copolymer layer is a prerequisite for repeatable switching memory.
authors.affiliation: Waseda Institute for Advanced Study (WIAS), Waseda University, Tokyo, 169-8555, Japan.
authors.forename: Takeo
authors.initials: T
authors.lastname: Suga
authors.affiliation: Department of Applied Chemistry, Waseda University, Tokyo, 169-8555, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Aoki
authors.affiliation: Department of Applied Chemistry, Waseda University, Tokyo, 169-8555, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yashiro
authors.affiliation: Department of Applied Chemistry, Waseda University, Tokyo, 169-8555, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nishide
keywords: charge-transport; ionic polymer; nitroxide radical; organic electronics; postpolymerization modification