Abstract
The gold electrodeposition process from a glycerol solution on a carbon paste electrode (CPE) was investigated by voltammetry and the morphologies of the electrodeposits were analyzed by scanning electron microscopy (SEM). Voltammetric study indicated that AuCl4− was reduced to Au0 and the process was mixed controlled (mass transport and electron transfer), preceded probably by AuCl4− decomplexation. Glycerol affected the kinetic of gold electrodeposition in function of the AuCl4− concentration. SEM images indicated that the gold electrodeposit covered totally some of the graphite flake by a homogeneous morphology, regardless of the electrodeposition condition. Moreover, using a full factorial planning it was verified that the deposition charge and potential affected the modified CPE performance in a potassium ferrocyanide solution, while HAuCl4 and glycerol concentrations affected only by interactions with the other factors.
Highlights
Carbon paste is a composite material obtained by mixing graphite powder and a binder.[1,2] The carbon paste electrode (CPE) is used in electroanalysis mainly due to the possibility of changing its composition, which can enhance the method sensibility and selectivity.[1,2] The modified CPE can be made by introducing a desired substance into the carbon past or on its surface
The effect of the glycerol on gold electrodeposition process on the CPE was studied by voltammetry and the morphology of the electrodeposit were analyzed by scanning electron microscopy (SEM)
To form a complex with Au3+, the glycerol needs to dislocate the chloride ion of the metal ion AuCl4− at a solution that contains NaCl (0.10 mol L-1), which could be reached in solution with high glycerol concentration
Summary
Carbon paste is a composite material obtained by mixing graphite powder and a binder (nujol, parafine, etc.).[1,2] The carbon paste electrode (CPE) is used in electroanalysis mainly due to the possibility of changing its composition, which can enhance the method sensibility and selectivity.[1,2] The modified CPE can be made by introducing a desired substance (organic,[3,4] inorganic,[5,6] enzyme,[7,8] etc.) into the carbon past or on its surface. Electrodeposition of Gold Films from a Glycerol Solution on Carbon Paste Electrode. The effect of the glycerol on gold electrodeposition process on the CPE was studied by voltammetry and the morphology of the electrodeposit were analyzed by scanning electron microscopy (SEM). Using a factorial planning, it was investigated the effect of some chemical and electrochemical parameters of electrodeposition on the modified carbon past electrode features in ferri/ferrocyanide system reversibility. The samples were prepared cutting off a little piece of the CPE and removing the mineral oil off the carbon paste by successive washing in cyclohexane, ammonium solution (1.4 × 10-3 mol L-1) and distilled water. The samples were dried at 80 °C for 4 h
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