title: Light-harvesting nanorods based on pheophorbide-appending cellulose.
abstract: In contrast to the success in artificial DNA- and peptide-based nanostructures, the ability of polysaccharides to self-assemble into one-, two-, and three-dimensional nanostructures are limited. Here, we describe a strategy for designing and fabricating nanorods using a regioselectively functionalized cellulose derivative at the air-water interface in a stepwise manner. A semisynthetic chlorophyll derivative, pyro-pheophorbide a, was partially introduced into the C-6 position of the cellulose backbone for the design of materials with specific optical properties. Remarkably, controlled formation of cellulose nanorods can be achieved, producing light-harvesting nanorods that display a larger bathochromic shift than their solution counterparts. The results presented here demonstrate that the self-assembly of functionalized polysaccharides on surfaces could lead the nanostructures mimicking the naturally occurring chloroplasts.
authors.affiliation: World Premier International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Sakakibara
authors.forename: Mari
authors.initials: M
authors.lastname: Granström
authors.forename: Ilkka
authors.initials: I
authors.lastname: Kilpeläinen
authors.forename: Juho
authors.initials: J
authors.lastname: Helaja
authors.forename: Santtu
authors.initials: S
authors.lastname: Heinilehto
authors.forename: Rintaro
authors.initials: R
authors.lastname: Inoue
authors.forename: Toshiji
authors.initials: T
authors.lastname: Kanaya
authors.forename: Jonathan P
authors.initials: JP
authors.lastname: Hill
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Nakatsubo
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Tsujii
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Ariga
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001674:Bioelectric Energy Sources; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry*; D002734:Chlorophyll / Q000031:analogs & derivatives* / Q000737:chemistry; D004566:Electrodes; D006860:Hydrogen Bonding; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D002734:Chlorophyll; D002482:Cellulose; C032623:pheophorbide a; C011934:mica