title: Green chitosan-carbon dots nanocomposite hydrogel film with superior properties.
abstract: 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.
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
authors.forename: Achyut
authors.initials: A
authors.lastname: Konwar
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India.
authors.forename: Neelam
authors.initials: N
authors.lastname: Gogoi
authors.affiliation: Department of Chemistry, Assam Engineering College, Jalukbari, Guwahati 781013, India.
authors.forename: Gitanjali
authors.initials: G
authors.lastname: Majumdar
authors.affiliation: Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India. Electronic address: devasish@iasst.gov.in.
authors.forename: Devasish
authors.initials: D
authors.lastname: Chowdhury
mesh_terms: D002244:Carbon / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D055772:Green Chemistry Technology; D055595:Mechanical Phenomena; D008756:Methylgalactosides / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D013662:Tea / Q000737:chemistry; D013696:Temperature
chemical_list: D008756:Methylgalactosides; D013662:Tea; C109801:hydrogel film; D002244:Carbon; D048271:Chitosan
keywords: Carbon dots; Chitosan; Hydrogel; Mechanical properties; Nanocomposite; Thermal properties