Abstract
The aim of this study is to prepare and study the cadmium sulfide quantum dot-graphene oxide-chitosan composite thin film. This composite material was coated on top of the gold layer by a spin-coating technique as a modification of the active layer for metal ion sensing using surface plasmon resonance spectroscopy (SPR). The composite material was prepared using a simple wet solution mixing method. An atomic force microscope (AFM) shows that the addition of GO increased the roughness of the composite thin film and the presence of CdS QDs cannot be observed as the size of the QDs are very small. The morphology of the nanocomposite material was observed using transmission electron microscopy (TEM). From the TEM images, it is observed that the materials mixed to form a nanocomposite material. The optical properties of the thin film via UV-Vis spectroscopy shows that the absorbance peaks of the thin film can be observed around 220 nm to near 300 nm, and the band gaps are around 4.0 eV. Lastly, the prepared thin film was tested as an active layer for metal ion detection via surface plasmon resonance (SPR), where the angle shift was observed to show that the prepared thin film has high potential for Co2+ ion detection.
Highlights
IntroductionOne of the most promising materials is chitosan
In recent years, a lot of novel materials have been discovered and studied
Chitosan is said to be the most important chitin derivative, which is cationic in nature and has good adsorption capacity and film-forming capability [1]
Summary
One of the most promising materials is chitosan. Chitosan is a semicrystalline polymer material that is derived from chitin by deacetylation under alkaline conditions. Chitosan is said to be the most important chitin derivative, which is cationic in nature and has good adsorption capacity and film-forming capability [1]. The stability of chitosan is low because of its hydrophilic character and pH sensitivity [1, 2]. A number of techniques have been used to improve the mechanical and chemical properties of chitosan. One of the techniques is crosslinking chitosan with a reagent such as ionophore or glutaraldehyde [4,5,6]. Chitosan can be reinforced by blending it with other novel materials such as graphene oxide [7,8,9]
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