Electrodeposition of graphene oxide and investigation of its electrochemical characteristics

• Main Author: How, Ka Zyn
• Other Authors: Liu Erjia
• Format: Final Year Project
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Materials::Nanostructured materials
• Online Access: http://hdl.handle.net/10356/60916
• Institution: Nanyang Technological University

An environmental friendly, reduced graphene oxide coated on tetrahedral amorphous carbon (rGO/Ta-C) electrode was successfully fabricated by electrodeposition method for determination of heavy metal Pb2+ ions using square wave anodic stripping voltammetry (SWASV). Cyclic voltammetry (CV) technique was adopted for in situ synthesis of reduced graphene oxide (rGO) film on the Ta-C electrode surface. Optimization of electrodeposition parameters was carried out to study the effects of number of scan cycles and voltage scan rate of cyclic voltammetry, the influence of the concentration of graphene oxide (GO) dispersion in an acetate buffer solution (ABS) as well as the molarity of acetate buffer solution. Raman spectroscopy was used to determine the chemical bonding structure of the electrodeposited materials on the Ta-C electrode surfaces. The sensitivity of each fabricated rGO/Ta-C electrode in tracing Pb2+ ions was analysed with SWASV. The optimum electrodeposition parameters were found out to be 10 scan cycles, 0.2 V/s, 0.2 M of acetate buffer solution containing 0.5 mg/ml of GO dispersion. The electrode fabricated under these conditions had a limit of detection (LOD) of about 0.01μM of Pb2+ ions, corresponding to an anodic stripping peak current of about 2.248 μA under optimum deposition time and deposition potential, 180 s and -1.2 V respectively.