Decoration of graphene oxide with copper selenide in supercritical carbon dioxide medium as a novel approach for electrochemical sensing of eugenol in various samples

• Published in: The Journal of supercritical fluids 2019-11, Vol.153, p.104597, Article 104597
• Main Authors: Murtada, Khaled, Moreno, Virginia, Ríos, Ángel, Zougagh, Mohammed
• Format: Article
• Language: English
• Subjects: Copper selenide; Eugenol; Glassy carbon electrode; Reduced graphene oxide; Supercritical carbon dioxide
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2019.104597

[Display omitted] •Reduced graphene oxide was decorated with copper selenide nanoparticles.•The reduction was performed in supercritical carbon dioxide medium.•GCE was modified with CuSe@rGO composites.•A new electrochemical sensor was developed for detection of eugenol.•The developed electrochemical sensor was applied to various samples. The decoration of reduced graphene oxide with copper selenide (CuSe@rGO) was carried out under supercritical carbon dioxide (sc-CO2). Sc-CO2 has gas-like diffusivity, extremely low viscosity, and excellent penetration ability, allowing it to reduce graphene oxide (GO) and debundle reduced graphene oxide (rGO) sheets to disperse CuSe nanoparticles in between. The synthesized nanomaterials, GO, rGO, CuSe@GO and CuSe@rGO were characterized and utilized to modify glassy carbon electrode (GCE) to improve electrochemical detection of eugenol. Using CuSe@rGO/GCE, a linear range between 1 μg/kg to 82 μg/kg, limit of detection of 0.41 μg/kg, and recoveries between 88.50% and 94.86% were obtained. These parameters represented a minimal 2-fold increase in sensitivity in comparison with the use of GCE, CuSe/GCE, GO/GCE, and rGO/GCE. The present work is meaningful to expand decorated graphene composites to sensor fields and promote the development of eugenol sensors in various samples.