Abstract
The modification of graphene quantum dots (GQDs) may drastically enhance their properties, therefore resulting in various related applications. This paper reported the preparation of novel cetyltrimethylammonium bromide/hydroxylated graphene quantum dots (CTAB/HGQDs) thin film using the spin coating technique. The properties of the thin film were then investigated and studied. The functional groups existing in CTAB/HGQDs thin film were confirmed by the Fourier transform infrared (FTIR) spectroscopy, while the atomic force microscope (AFM) displayed a homogenous surface of the thin film with an increase in surface roughness upon modification. Optical characterizations using UV-Vis absorption spectroscopy revealed a high absorption with an optical band gap of 4.162 eV. Additionally, the photoluminescence (PL) spectra illustrated the maximum emission peak of CTAB/HGQDs thin film at a wavelength of 444 nm. The sensing properties of the as-prepared CTAB/HGQDs thin film were studied using a surface plasmon resonance technique towards the detection of several heavy metal ions (HMIs) (Zn2+, Ni2+, and Fe3+). This technique generated significant results and showed that CTAB/HGQDs thin film has great potential for HMIs detection.
Highlights
In the past few years, there has been astonishing progress in the study and application of various quantum dots (QDs), owing to their versatile chemical and physical properties
Cetyltrimethylammonium bromide (CTAB)/hydroxylated GQDs (HGQDs) thin thin film film has has been been successfully successfully prepared prepared using using the the spin spin coating coating result confirmed that the existence of ammonium, carbonyl, carboxyl, and technique
The Fourier transform infrared (FTIR) result confirmed that the existence of ammonium, carbonyl, carboxyl, and epoxy epoxy groups justified the interaction between analysis groups justified the interaction between CTAB and HGQDs
Summary
In the past few years, there has been astonishing progress in the study and application of various quantum dots (QDs), owing to their versatile chemical and physical properties. There are many oxygen-containing functional groups at the edges of GQDs, making them easier to be modified with other materials. This property will in return give researchers many options to modify the GQDs according to the desired application [11,12,13]. All the aforementioned favorable properties of CTAB, it is worth noting that the modification of materials with CTAB will enhance the sensing performance of the materials, resulting in improved sensitivity and limit of detection. Due to the awareness of HMIs pollution, there is an urge to produce a high sensitivity material towards the detection of HMIs. CTAB is used to modify HGQDs producing cetyltrimethylammonium bromide/hydroxylated graphene quantum dots (CTAB/HGQDs).
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