Abstract

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ELECTRODEPOSITION OF SILVER NANOPARTICLES ON CARBON SPHERE SURFACES BY PULSE CURRENT

Manal A. Hassan, Zeinab Abdel Hamid, Nabil Nassif, Mahmoud rabah


This work studied the effect of applying pulse current (ton=off=1s) on the electrodeposition of silver nanoparticles on carbon sphere surface as a substrate. The electrolyte is made of 0.1 M KNO3, 0.1 M KCN and 0.01M AgNO3. The pH value has been adjusted in the alkaline region of 9.1 with the help of K(NO3) addition. Experiments were carried out at room temperature for periods up to 12 minutes. The cell is fitted with a mechanical stirrer to keep the electrolyte in a dynamic state. Product(s) was characterized with the help of SEM and EDX and field emission. Results obtained show that silver nanoparticles has successfully electrodeposited under pulse current conditions with a particle size of 100–400 nm after 2 minutes. Deposition takes place on certain accessible sites of the carbon surface of the substrate forming a monolayer of scattered silver nanoparticles. Formation of macro particles with larger diameter and multilayer in thickness takes place with continuous deposition of silver nanoparticles on the formerly deposited silver. Pulse current helps management of the monolayer deposition as compared to the steady DC application with respect to particle diameter and number of layers.