Cationically Modified Nanocrystalline Cellulose/Carboxyl-Functionalized Graphene Quantum Dots Nanocomposite Thin Film: Characterization and Potential Sensing Application

Najwa Norimanina Muhammad Rosddi,Wan Mohd Ebtisyam Mustaqim Mohd Daniyal,Nur Alia Sheh Omar,Nur Syahira Md Ramdzan,Nur Ain Asyiqin Anas,Yap Wing Fen

doi:10.3390/cryst10100875

Najwa Norimanina Muhammad Rosddi, Wan Mohd Ebtisyam Mustaqim Mohd Daniyal + Show 4 more

Open Access

https://doi.org/10.3390/cryst10100875

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Journal: Crystals	Publication Date: Sep 27, 2020
Citations: 14	License type: CC BY 4.0

Affiliation: Universiti Putra Malaysia

Abstract

In this study, highly functional cationically modified nanocrystalline cellulose (NCC)/carboxyl-functionalized graphene quantum dots (CGQD) has been described. The surface of NCC was first modified with hexadecyltrimethylammonium bromide (CTA) before combining with CGQD. The CGQD, CTA-NCC and CTA-NCC/CGQD nanocomposites thin films were prepared using spin coating technique. The obtained nanocomposite thin films were then characterized by using the Fourier transform infrared spectroscopy (FTIR) which confirmed the existence of hydroxyl groups, carboxyl groups and alkyl groups in CTA-NCC/CGQD. The optical properties of the thin films were characterized using UV–Vis spectroscopy. The absorption of CTA-NCC/CGQD was high with an optical band gap of 4.127 eV. On the other hand, the CTA-NCC/CGQD nanocomposite thin film showed positive responses towards glucose solution of different concentration using an optical method based on surface plasmon resonance phenomenon. This work suggests that the novel nanocomposite thin film has potential for a sensing application in glucose detection.

Highlights

In recent years, there has been an interest in the production of nanocrystalline cellulose (NCC) from cellulosic material because of its biodegradability, renewability, abundance and excellent mechanical properties [1]
Solution (0.1 wt%) was purchased from ACS Material (Pasadena, CA, USA) and glucose was purchased from R&M Marketing (Essex, UK)
To prepare NCC solution, 1 g of NCC was diluted in 100 mL deionized water

Summary

Introduction

There has been an interest in the production of nanocrystalline cellulose (NCC) from cellulosic material because of its biodegradability, renewability, abundance and excellent mechanical properties [1]. In this world, cellulose is one of the most numerous natural renewable and biodegradable polysaccharides. NCC is obtained when cellulose undergoes acid hydrolysis with conditions where the amorphous regions are selectively hydrolyzed [4]. Mineral acids including hydrochloric acid and sulfuric acid are used in the mixture of hydrolysis of cellulose to prepare NCC [5]. NCC is constitutively acidic and exhibits a lyotropic phase behavior

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