Green chitosan–carbon dots nanocomposite hydrogel film with superior properties

•Synthesis of carbon dots (CD) from tea by a greener approach.•Preparation of stable, soft but tough chitosan–carbon dots nanocomposite hydrogel films.•Carbon dots improve the strength, thermostability and wettability of chitosan hydrogel films. In this work we report novel chitosan–carbon dots nano...

Full description

Saved in:
Bibliographic Details
Published in:Carbohydrate polymers 2015-01, Vol.115, p.238-245
Main Authors: Konwar, Achyut, Gogoi, Neelam, Majumdar, Gitanjali, Chowdhury, Devasish
Format: Article
Language:English
Subjects:
Carbon - chemistry
Carbon dots
Chitosan
Chitosan - chemistry
Green Chemistry Technology
Hydrogel
Mechanical Phenomena
Mechanical properties
Methylgalactosides - chemistry
Nanocomposite
Nanocomposites - chemistry
Tea - chemistry
Temperature
Thermal properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Synthesis of carbon dots (CD) from tea by a greener approach.•Preparation of stable, soft but tough chitosan–carbon dots nanocomposite hydrogel films.•Carbon dots improve the strength, thermostability and wettability of chitosan hydrogel films. In this work we report novel chitosan–carbon dots nanocomposite hydrogel films. A new green source “tea” was used as precursor for carbon dots (CDs). The electrostatic interaction of positive charge on chitosan and negative charge on CDs prepared from tea was used for the successful preparation of a stable and robust chitosan–carbon dots nanocomposite hydrogel film. The hydrogel films were characterized by UV–visible spectroscopy, X-ray diffraction (XRD), Fourier transformed infra-red spectroscopy (FTIR), scanning electron microscope (SEM), fluorescent microscopy, thermogravimetric analysis (TGA) and contact angle analysis. It was observed that chitosan–carbon dots hydrogel films are soft but tough with superior UV–visible blocking, swelling, thermal and mechanical properties in comparison to chitosan hydrogel film. Moreover chitosan–carbon dots films are more water repellent (hydrophobic) as indicated by their high contact angle values. Thus, fabrication of such green soft but tough biocompatible chitosan–carbon dots nanocomposite hydrogel films offers tremendous bio-medical and industrial applications.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2014.08.021