Author/Authors :
Reddy، Sathish نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Shimoga, Karnataka 577451, India , , Kumara Swamy، Bahaddurghatta E. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Shimoga, Karnataka 577451, India , , Chandrashekar، Bananakere N. نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Shimoga, Karnataka 577451, India , , Chitravathi، Shankarlingegowda نويسنده Department of P.G. Studies and Research in Industrial Chemistry, Kuvempu University, Jnana Sahyadri, Shankaraghatta, Shimoga, Karnataka 577451, India , , Jayadevappa، Honnali نويسنده Department of Chemistry, Sahyadri Science College, Shimoga, Karnataka, India ,
Abstract :
ZnO nanoparticles were synthesized using zinc nitrate, cetyltrimethyl ammonium
bromide and sodium hydroxide in co-precipitation method. The obtained particles were
characterized using X-ray diffractometer (XRD), UV-Vis absorption spectroscopy (UV-Vis),
Infrared absorption spectroscopy (IR) and Scanning electron microscopy (SEM). The ZnO
nanoparticles are used for the preparation of modified carbon paste electrode (MCPE). The
MCPE was applied for electrochemical investigation of dopamine (DA) which exhibits
enhancement of current response with reduction of over potential for investigation of DA at
pH.7.0. The effect of pH range from 5.5 to 8.0 was studied and the redox peak was pH
dependent with a slope of 53 mV/pH. The effect of scan rate shows adsorption controlling
process and the electrocatalytic currents increases linearly with increase in DA concentrations
in the ranges of 0.1-20 ?M. The detection limit was found to be 0.3×10-7 M.
