Mechanically Robust, Electrically Conductive Biocomposite Films Using Antimicrobial Chitosan-Functionalized Graphenes

Title
Mechanically Robust, Electrically Conductive Biocomposite Films Using Antimicrobial Chitosan-Functionalized Graphenes
Authors
산토쉬 쿠마르 야다브정용채김진희고영일류희정뮤케쉬 쿠마르 야다브김융암조재환
Keywords
Graphene; Chitosan; Biocomposite; Antimicrobial
Issue Date
2013-08
Publisher
Particle & particle systems characterization : measurement and description of particle properties and behavior in powders and other disperse systems
Citation
VOL 30, NO 8, 721-727
Abstract
An effective way of covalently functionalizing graphene with a chitosan polymer via a nitrene chemistry is demonstrated. The biofunctionalized graphene is prepared by the chemical reduction of graphene oxide using a nitrene chemistry, and then covalently grafting chitosan to the graphene surface. The effectiveness of the biofunctionalized graphene as a reinforcing fi ller (4 wt%) in a chitosan polymer matrix is verifi ed by the dramatic enhancement of the mechanical properties (breaking stress = 330%, Young’s modulus = 243%) and the electrical conductivity (0.3 S m −1 ) without much loss in the elongation-at-break. The reinforcing effect can be explained by both the homogeneous dispersion of graphene within the matrix and the strong bond arising from the intrinsically intimate contact between the graphene and the matrix. The high antimicrobial activity of the biofunctionalized graphene compared with graphene oxide and chemically reduced graphene may be because of the presence of chitosan polymer on the edges of the graphene. The strong, antimicrobial graphene-fi lled composite fi lm can be used for food packaging and for coating various biomedical devices, where bacterial surface colonization is undesirable.
URI
http://pubs.kist.re.kr/handle/201004/46025
ISSN
09340866
Appears in Collections:
KIST Publication > Article
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