Functionalization of magnetic nanowires by charged biopolymers.
We report on a facile method for the preparation of biocompatible and bioactive magnetic nanowires. The method consists of the direct deposition of polysaccharides by layer-by-layer (LbL) assembly onto a brush of metallic nanowires obtained by electrodeposition of the metal within the nanopores of an alumina template supported on a silicon wafer. Carboxymethylpullulan (CMP) and chitosan (CHI) multilayers were grown on brushes of Ni nanowires; subsequent grafting of an enzyme was performed by conjugating free amine side groups of chitosan with carboxylic groups of the enzyme. The nanowires are finally released by a gentle ultrasonic treatment. Transmission electron microscopy, electron energy-dispersive loss spectroscopy, and x-ray photoelectron spectroscopy indicate the formation of an homogeneous coating onto the nickel nanowires when one, two, or three CMP/CHI bilayers are deposited. This easy and efficient route to the biochemical functionalization of magnetic nanowires could find widespread use for the preparation of a broad range of nanowires with tailored surface properties.
Magnin
D
D
Unité de Physique et de Chimie des Hauts Polymères (POLY), Université Catholique de Louvain, Place Croix du Sud, 1, B-1348 Louvain-la-Neuve, Belgium.
Callegari
V
V
Mátéfi-Tempfli
S
S
Mátéfi-Tempfli
M
M
Glinel
K
K
Jonas
A M
AM
Demoustier-Champagne
S
S
D001704:Biopolymers / Q000737:chemistry*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D048271:Chitosan / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D005936:Glucans / Q000737:chemistry; D008280:Magnetics; D008422:Materials Testing; D008969:Molecular Sequence Data; D053770:Nanowires / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014465:Ultrasonics
D001704:Biopolymers; D020099:Coated Materials, Biocompatible; D005936:Glucans; C410955:carboxymethylpullulan; D009532:Nickel; D048271:Chitosan