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The effects of laser pulse irradiation at glassy carbon electrode on the electrochemistry of dopamine and ascorbic acid
Rahayu R.S.a, Noviandri I.a, Buchari B.a, Abdullah M.a, Hinoue T.b
a Analytical Chemistry Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia
b Department of Chemistry, Faculty of Science, Shinshu University, Japan
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]In this research, we found that treatment of a glassy carbon (GC) electrode using laser pulse irradiation offers substantial improvements of its selectivity and sensitivity toward voltammetric determination of dopamine (DA) in the presence of ascorbic acid (AA). In phosphate buffer of pH 7.0, oxidation of DA at an untreated GC electrode was controlled by a mixture of both adsorption and diffusion but at the treated GC electrode diffusion-controlled became dominant. When cyclic voltammograms of DA were measured with the untreated and treated GC electrode, the oxidation peak current at the treated GC electrode was five times larger than that at the untreated GC electrode. The midpoint potential (Em) at the treated GC electrode shifted about 0.03 V to a negative potential and the peak separation (δEp) decreased from 0.16 V at the untreated GC to 0.04 V at the treated GC. The enhancement in the oxidation peak current by the use of the treated GC electrode was probably due to activation of the GC electrode and an increase in electrode surface area because of roughening the electrode surface by laser pulse irradiation. Similar results were found for AA. The oxidation peak potential of AA at the treated GC electrode shifted about 0.47 V to a more negative potential, compared with that at the untreated GC electrode. In addition, the oxidation peak current at the treated GC electrode increased about twice larger than that at the untreated GC electrode. The enhancement in the oxidation peak of AA is not only due to an increase in electrode surface area but also due to activation of the GC electrode by laser pulse irradiation. Using the treated GC electrode by laser pulse irradiation, two oxidation peaks of DA and AA could be separated with a potential difference enough to distinguish between them in cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Based on this result, the voltammetric determination of DA could be performed in the presence of AA. © 2012 by ESG.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Ascorbic acid,Dopamine,Glassy carbon,Laser pulse irradiation,Voltammetry[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]