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Title: Graphene oxide electroreduced onto boron-doped diamond and electrodecorated with silver (Ag/GO/BDD) electrode for tetracycline detection in aqueous solution
Authors: Negrea, Sorina Claudia 
Diaconu, Lidia Ani 
Nicorescu, Valeria 
Motoc, Sorina 
Orha, Corina 
Manea, Florica 
Affiliations: National Research and Development Institute for Industrial Ecology, ECOIND 
National Research and Development Institute for Industrial Ecology, ECOIND 
National Research and Development Institute for Industrial Ecology, ECOIND 
“Coriolan Dragulescu” Institute of Chemistry Timisoara of Romanian Academy 
National Research and Development Institute in Electrochemistry and Condensed Matter 
Politehnica University of Timisoara 
Keywords: Silver electrocatalyst;Tetracycline;Electrochemical detection;Silver-graphene oxideboron-doped diamond
Issue Date: Jun-2021
Publisher: MDPI, Basel, Switzerland.
A new electrochemical sensor designed by modifying the commercial boron-doped diamond (BDD) electrode with graphene oxide (GO) reduced electrochemically and further electrodecorated with silver (Ag), named the Ag/GO/BDD electrode, was selected among a series of the BDD, GO electroreduced onto BDD (GO/BDD) and silver electrodeposited onto BDD (Ag/BDD) electrodes for the detection of tetracycline (TC) in aqueous solution. The best results regarding the sensitivity of 46.6 µA · µM −1 ·cm −2 and the lowest limit of detection of 5 nM was achieved using square-wave voltammetry (SWV) operated at the step potential of 5 mV, modulation amplitude of 200 mV, and the frequency of 10 Hz in alkaline medium. The application of the alkaline supporting electrolyte-based procedure is limited for water monitoring due to the presence of chloride that interferes with TC detection; however, it can be applied for the quantitative determination of pharmaceutical formulations. 0.1
M Na2SO4 supporting electrolyte eliminated chloride interference and can be used for the application
of Ag/GO/BDD in practical detection of TC in water.
Nanomaterials, 2021, vol. 11, 1566,
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