title: Fabricating and aligning pi-conjugated polymer-functionalized DNA nanowires: atomic force microscopic and scanning near-field optical microscopic studies.
abstract: We report a simple method to functionalize DNA with pi-conjugated polymer, forming highly aligned and integrated arrays of pi-conjugated polymer nanowires of a few nanometers diameter. pi-conjugated polymer, polyphenazasiline, having alkylammonium salts on the N atom (PPhenaz-TMA), synthesized in this study can be directly attached to DNA, which can be organized along stretched and aligned DNA molecules on surfaces as a template. Furthermore, PPhenaz-TMA/DNA nanowires were stretched and aligned on surfaces, even when PPhenaz-TMA/DNA complexes formed in solutions. The resulting PPhenaz-TMA/DNA nanowires could be easily converted to oxidized states or metallic nanowires by using adequate oxidant or metal salts. The direct visualization of PPhenaz-TMA/DNA nanowires and its structural changes have been studied by atomic force microscopy and scanning near-field optical microscopy.
authors.affiliation: National Food Research Institute, Kannondai 2-1-12, Tsukuba, Ibaraki 305-8642, Japan.
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Nakao
authors.forename: Hideki
authors.initials: H
authors.lastname: Hayashi
authors.forename: Futoshi
authors.initials: F
authors.lastname: Iwata
authors.forename: Hidenori
authors.initials: H
authors.lastname: Karasawa
authors.forename: Koji
authors.initials: K
authors.lastname: Hirano
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sugiyama
authors.forename: Toshio
authors.initials: T
authors.lastname: Ohtani
mesh_terms: D004247:DNA / Q000032:analysis*; D018625:Microscopy, Atomic Force / Q000379:methods*; D015394:Molecular Structure; D053770:Nanowires / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000379:methods*; D013499:Surface Properties
chemical_list: D011108:Polymers; D004247:DNA