Functionalized GO nanoplatelets with folic acid as a novel material for boosting humidity sensing of chitosan/PVA nanocomposites for active food packaging

Theodor Bilharz Research Institute

Bibliographic Information

Authors: Moustafa H.; Hemida M.H.; Shemis M.A.; Dufresne A.; Morsy M.

Journal: Surfaces and Interfaces

Publisher: Elsevier B.V.

Publication Date: October 2023

Volume / Issue: Volume 41

Article No.: 103229

ISSN: 24680230

DOI: 10.1016/j.surfin.2023.103229

Scopus: View on Scopus

Document Type: Article

Authors and Affiliations

Moustafa H., Department of Polymer Metrology & Technology, National Institute of Standards (NIS), Tersa Street, El Haram, P.O Box 136, Giza, 12211, Egypt, Bioanalysis Laboratory, National Institute of Standards (NIS), Tersa Street, El Haram, P.O Box 136, Giza, 12211, Egypt; Hemida M.H., Agricultural Engineering Department, Faculty of Agriculture, Cairo University, Giza, Egypt; Shemis M.A., Department of Biochemistry and Molecular Biology, Theodore Bilharz Research Institute, Giza, Egypt; Dufresne A., Université Grenoble Alpes, CNRS, Grenoble INP, LGP2, Grenoble, F-38000, France; Morsy M., Building Physics and Environment Institute, Housing and Building National Research Center (HBRC), Dokki, Giza, Egypt, Nanotechnology Research Center (NTRC), The British University in Egypt (BUE), El Sherouk City, Suez Desert Road, Cairo, 11837, Egypt

Abstract

Humidity sensing materials play a pivotal role for serving as the essence of moisture sensors to trap surrounding water molecules through hydrophilic interaction, chemical bonding, or hydrogen bonds, therefore enhancing the sensor conductivity. Thus, this work addresses a highly efficient humidity sensing material based on folic acid (FA) functionalized graphene oxide (GO) which was prepared for consolidating inside chitosan (CS)/polyvinyl alcohol (PVA) (80/20) blend by the solvent casting approach. The structure of GO and its decoration were ratified by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and UV–vis spectroscopies. Three GO-FA contents (i.e., 10, 20, and 30 vol%) were utilized to fabricate the renewable CS/PVA nanosensors. The morphology of fabricated sensors was characterized by XRD and scanning electron microscopy (SEM). SEM images showed that the miscibility and dispersibility of GO-FA nanoplatelets in the CS/PVA matrix are better at 10 and 20 vol%, although the tensile strength increased to 69.40 MPa for the nanocomposite film containing 30 vol% GO-FA compared to the blank specimen. Moreover, other investigations such as Raman spectroscopy and antibacterial activities were performed on the CS/PVA sensors. The humidity sensing properties were carried out over a broad range of relative humidity from (7–97% RH) and frequency (100 Hz-100 kHz). The data revealed that 1 kHz was considered to be the optimum frequency. Furthermore, the obtained outcomes from humidity-sensing tests at 1 kHz showed that the sensor C10 had higher sensitivity with ultrafast response/recovery times (2.6 s/3.5 s) compared to other nanosensors, to be used in intelligent food packaging and preservation. © 2023 Elsevier B.V.

Keywords

Active food packaging; Chitosan/PVA blend; Graphene oxide/folic acid humidity sensing material; Humidity sensor; Mechanical properties

Citation Information

Scopus Citations: 49

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