Abstract

Electrochemical analysis based on screen-printed electrodes (SPEs) represents a great alternative to conventional analytical methods such as ICP-MS or LC-MS due to their portability, sensitivity, selectivity, and cost-effectiveness. In addition, the functionalization of SPEs with nanomaterials has been reported to provide an enhanced analytical performance. In this regard, silver nanoparticles (AgNPs) were synthesized and appropriately characterized, showing spherical silver nanoseeds (Ag-NS) with a diameter of 12.20 ± 0.04 nm. Using the drop-casting methodology, the synthesized AgNPs were used to modify screen-printed carbon nanofiber electrodes (SPCNFEs). Ag-NS deposition onto the electrode surface was confirmed by scanning electron microscopy (SEM). Furthermore, the analytical response of the modified electrodes (Ag-NS-SPCNFE) was evaluated for the determination of trace Pb(II), Cd(II), and As(V) using differential pulse anodic stripping voltammetry (DPASV), obtaining detection limits of 3.3, 3.7, and 2.6 µg L−1, for Pb(II), Cd(II) and As(V), respectively. Finally, Ag-NS-SPCNFE was tested towards the determination of As(V) in a spiked tap water sample, showing a good agreement with concentrations determined by ICP-MS.

Highlights

  • Ag-NS and screen-printed carbon nanofiber electrodes (SPCNFEs) modified with Ag-NS electrodes were characterized using a JEM-2010 transmission electron microscope (TEM) from JEOL (Tokyo, Japan) and a Gemini scanning electron microscope (SEM) from ZEISS® (Jena, Germany), respectively

  • Ag-NS synthesis synthesis was was microscopically microscopically confirmed by both scanning electron microscopy (SEM)

  • As it can be deduced from the presented a spherical (Figure 1b). As it can deduced from the TEM image, most Ag-NS presented a spherical shape

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Summary

Extended Abstract

Customized Screen-Printed Electrodes Based on Ag-Nanoseeds for Enhanced Electroanalytical Response towards Cd(II), Pb(II). Karina Torres-Rivero 1,2, * , Clara Pérez-Ràfols 3 , Julio Bastos-Arrieta 4 , Núria Serrano 3,5 , Vicenç Martí 1,2,6 and Antonio Florido 1,2. Barcelona Research Center for Multiscale Science and Engineering, Av. Eduard Maristany 16, 08019 Barcelona, Spain. Institut de Recerca de l’Aigua (IdRA), Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain. Eurecat-Centre Tecnològic de Catalunya, Water Air and Soil Unit, Plaça de la Ciència 2, 08243 Manresa, Spain. Presented at the 1st International Electronic Conference on Chemical Sensors and Analytical Chemistry, 1–15 July 2021; Available online: https://csac2021.sciforum.net/

Introduction
Apparatus
Preparation of Working Electrodes
Electrochemical Measurements
Microscopic
Electrochemical
Application
Conclusions

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