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    Enhanced voltammetric response of monosodium glutamate on screen-printed electrodes modified with NiAl layered double hydroxide films

    Year: 2021

    Journal: Surf. Interfaces, Volume 24, JUN

    Authors: Baciu, Dora Domnica; Birjega, Ruxandra; Marascu, Valentina; Zavoianu, Rodica; Matei, Andreea; Vlad, Angela; Cojocaru, Anca; Visan, Teodor

    Organizations: Romanian Research Authority [PN-II-RU-TE-2014-4-1550 (TE 271/2015), PN-II-RU-TE-2014-4-0976 (TE 270/2015)]

    Keywords: Monosodium glutamate; Carbon screen-printed electrochemical sensors; Laser deposition techniques; NiAl-layered double hydroxide films

    Cyclic voltammetry preliminary studies carried out on commercial carbon screen-printed electrodes (SPEs) confirmed an irreversible reduction process of glutamate in aqueous solutions of monosodium glutamate (MSG). Modified carbon SPEs coated with Ni3Al-CO3 layered double hydroxide (NiAl-LDH) film were prepared by pulse laser deposition (at 1064, 532, 355 and 266 nm wavelength). Also, carbon electrodes were covered with NiAlLDH film and NiAl LDH + graphene composite film by matrix assisted pulsed laser evaporation (at 266 nm). Both prepared LDH powder used as laser target and LDH films were characterized by XRD. LDH and LDH-composite films were characterized by FTIR spectroscopy, SEM, AFM and contact angle measurements. All cyclic voltammograms recorded at 0.08 V/s on bare carbon screen-printed electrode and modified electrodes coated with different LDH films exhibited a linear dependence for cathodic peak current vs. MSG concentration. Compared to the slope value (2.563 +/- 0.262 mu Acm(-2)mu M-1) obtained in the case of bare carbon screen-printed electrode, the sensitivity performances of the modified electrodes were substantially increased. The best results were recorded under optimum conditions for graphene composite film, namely a value of 8.567 +/- 0.565 mu Acm(-2)mu M-1. Cyclic voltammetry tests of modified electrodes prepared by laser technique with addition of radiofrequency plasma indicated a negative effect on surface electroactivity, with drastically reducing the quality of MSG cathodic voltammetric signal.
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