A novel composite based on pyrene thiazole grafted on graphene oxide:physico-chemical characterization and electrochemical investigations

• Published in: Materials chemistry and physics 2021-04, Vol.262, p.124315, Article 124315
• Main Authors: Tudose, Madalina, Baratoiu-Carpen, Rodica D., Anghel, Elena Maria, Voicescu, Mariana, Somacescu, Simona, Culita, Daniela C., Hanganu, Anamaria, Kuncser, Andrei, Radoi, Antonio
• Format: Article
• Language: English
• Subjects: Acids; Chlorides; Electrochemical analysis; Electrodes; Electron microscopy; Fluorescence; Graphene; Graphene oxide; Infrared spectroscopy; Mathematical analysis; Microscopy; NMR; Nuclear magnetic resonance; Photoelectrons; Pyrene thiazole; Raman spectroscopy; Spectrum analysis; Square wave voltammetry; Square waves
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2021.124315

We report the obtaining of a new composite starting from pyrene thiazole, a compound certified by nuclear magnetic resonance and its covalent grafting on the surface of graphene oxide. Novel material was synthesized in two stages: the first involving transformation of carboxyl groups of graphene oxide into acid chlorides and the second the amide reaction between acid chloride and amine group of pyrene thiazole (PTC). Numerous characterization methods have been used to certify this material, such as: Raman spectroscopy, fluorescence, infrared spectroscopy and X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy. Their results show the successful covalent functionalization of graphene oxide with pyrene thiazole through the formation of amide bonds. The electrochemical investigation consisted of evaluating the redox behavior of the carbon screen printed electrodes modified with the new composite (GO-PTC) using caffeic acid, as analyte. From analytical point of view, it is relevant to be able to quantify the presence of caffeic acid and for such reason we used as analytical method the square wave voltammetry. The results showed that the GO-PTC modified carbon screen printed electrodes were able to detect the caffeic acid over more than one order of magnitude (linear working range: 0.005–0.1 mM) and GO-PTC modified electrodes can be considered promising for other analytical investigations. [Display omitted] •Composite based on pyrene thiazole and graphene oxide has been obtained.•The electrochemical behavior of the composite was studied.•Composite modified carbon-screened electrodes were able to detect the caffeic acid.