Optical and surface plasmon resonance sensing properties for chitosan/carboxyl-functionalized graphene quantum dots thin film

In this study, chitosan/carboxyl-functionalized graphene quantum dots thin film was developed. Its optical and surface plasmon resonance sensing properties were explored. Fourier transform infrared spectroscopy proved the presence of OH bond, CH bond, CO bond, and CO bond in chitosan/carboxyl-functi...

Full description

Saved in:
Bibliographic Details
Published in:Optik (Stuttgart) 2019-02, Vol.178, p.802-812
Main Authors: Ramdzan, Nur Syahira Md, Fen, Yap Wing, Omar, Nur Alia Sheh, Anas, Nur Ain Asyiqin, Daniyal, Wan Mohd Ebtisyam Mustaqim Mohd, Saleviter, Silvan, Zainudin, Afiq Azri
Format: Article
Language:English
Subjects:
Chitosan
Graphene
Mercury ion
Optical properties
Quantum dots
Sensing
Surface plasmon resonance
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:In this study, chitosan/carboxyl-functionalized graphene quantum dots thin film was developed. Its optical and surface plasmon resonance sensing properties were explored. Fourier transform infrared spectroscopy proved the presence of OH bond, CH bond, CO bond, and CO bond in chitosan/carboxyl-functionalized graphene quantum dots thin film. The optical properties of the composite thin film were studied using UV–vis and photoluminescence spectroscopy. The chitosan/carboxyl-functionalized graphene quantum dots thin film showed the high absorbance value with an optical band gap of 4.012 eV. From photoluminescence spectroscopy, red light emission spectra are emitted due to the absorption peak of about 725 nm to 775 nm that corresponds to π→π* transitions of CO bond. The surface morphology of thin film was observed using atomic force microscopy indicates a granular structure with an average height of 18.4 nm of the composite thin film. The experimental surface plasmon resonance curves were obtained for different concentration in a range from 0 to 100 ppm of Hg2+ solution. A linear relationship between the shifts of resonance angle for chitosan/carboxyl-functionalized graphene quantum dots thin film in contact with Hg2+ solution with a sensitivity of 0.00062° ppm−1 has been observed. These results confirmed that the chitosan/carboxyl-functionalized graphene quantum dots thin film shows potential for the detection of Hg2+ using surface plasmon resonance technique.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2018.10.071