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Salikhov RB, Zilberg RA, Mullagaliev IN, Salikhov TR, Teres YB. Nanocomposite thin film structures based on polyarylenephthalide with SWCNT and graphene oxide fillers. MENDELEEV COMMUNICATIONS 2022. [DOI: 10.1016/j.mencom.2022.07.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Composite Electrodes Based on Carbon Materials Decorated with Hg Nanoparticles for the Simultaneous Detection of Cd(II), Pb(II) and Cu(II). CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10040148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Monitoring water quality has become a goal to prevent issues related to human health and environmental conditions. In this sense, the concentration of metal ions in water sources is screened, as these are considered persistent contaminants. In this work, we describe the implementation of customized graphite electrodes decorated with two types of Hg nanoparticles (Hg-NPs), optimized toward the electrochemical detection of Cd, Pb and Cu. Here, we combine Hg, a well-known property to form alloys with other metals, with the nanoscale features of Hg-NPs, resulting in improved electrochemical sensors towards these analytes with a substantial reduction in the used Hg amount. Hg-NPs were synthesized using poly(diallyldimethylammonium) chloride (PDDA) in a combined role as a reducing and stabilizing agent, and then appropriately characterized by means of Transmission Electron Microscopy (TEM) and Zeta Potential. The surface of composite electrodes with optimized graphite content was modified by the drop-casting of the prepared Hg-NPs. The obtained nanocomposite electrodes were morphologically characterized by Scanning Electron Microscopy (SEM), and electrochemically by Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The results show that the Hg-NP-modified electrodes present better responses towards Cd(II), Pb(II) and Cu(II) detection in comparison with the bare graphite electrode. Analytical performance of sensors was evaluated by square-wave anodic stripping voltammetry (SWASV), obtaining a linear range of 0.005–0.5 mg·L−1 for Cd2+, of 0.028–0.37 mg·L−1 for Pb2+ and of 0.057–1.1 mg·L−1 for Cu2+. Real samples were analyzed using SWASV, showing good agreement with the recovery values of inductively coupled plasma–mass spectrometry (ICP-MS) measurements.
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Montes R, Sánchez G, Zhao J, Palet C, Baeza M, Bastos-Arrieta J. Customized In Situ Functionalization of Nanodiamonds with Nanoparticles for Composite Carbon-Paste Electrodes. NANOMATERIALS 2020; 10:nano10061179. [PMID: 32560355 PMCID: PMC7353388 DOI: 10.3390/nano10061179] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/12/2020] [Accepted: 06/15/2020] [Indexed: 11/29/2022]
Abstract
The incorporation of nanomaterials on (bio)sensors based on composite materials has led to important advances in the analytical chemistry field due to the extraordinary properties that these materials offer. Nanodiamonds (NDs) are a novel type of material that has raised much attention, as they have the possibility of being produced on a large scale by relatively inexpensive synthetic methodologies. Moreover, NDs can present some other interesting features, such as fluorescence, due to surface functionalization and proved biocompatibility, which makes them suitable for biomedical applications. In addition, NDs can be customized with metallic nanoparticles (NPs), such as silver or gold, in order to combine the features of both. Raw NDs were used as modifiers of sensors due to the electrocatalytic effect of the sp2 and oxygenated species present on their surface. The aim of this research work is evaluating the applicability of NDs modified with silver (Ag@NDs) and gold (Au@NDs) nanoparticles for the development of a suitable (bio)sensing platform. A complete morphological and electrochemical characterization as a function of the prepared nanocomposite composition was performed in order to improve the electroanalytical properties of the developed (bio)sensors. In the present work, the optimal composition for Au@NDs present on the nanocomposite matrix is 3.5% and the one for Ag@NDs is 1%. Good results were obtained in the evaluation of the optimal composition towards hydrogen peroxide and glucose as a model analyte using a (bio)sensor based on graphite-epoxy-Ag@NDs (17:82:1).
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Affiliation(s)
- Raquel Montes
- GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, Carrer de les Sitges, 08193 Bellaterra (Cerdanyola del Vallès), Spain;
| | - Gerard Sánchez
- GENOCOV Research Group, Department of Chemistry, Faculty of Science, Edifici C-Nord, Universitat Autònoma de Barcelona, Carrer dels Til·lers, 08193 Bellaterra (Cerdanyola del Vallès), Spain;
| | - Jingjing Zhao
- Grup de Tècniques de Separació en Química, Department of Chemistry, Facultat de Ciències, Universitat Autònoma de Barcelona, Carrer dels Til·lers, 08193 Bellaterra (Cerdanyola del Vallès), Spain; (J.Z.); (C.P.)
| | - Cristina Palet
- Grup de Tècniques de Separació en Química, Department of Chemistry, Facultat de Ciències, Universitat Autònoma de Barcelona, Carrer dels Til·lers, 08193 Bellaterra (Cerdanyola del Vallès), Spain; (J.Z.); (C.P.)
| | - Mireia Baeza
- GENOCOV Research Group, Department of Chemistry, Faculty of Science, Edifici C-Nord, Universitat Autònoma de Barcelona, Carrer dels Til·lers, 08193 Bellaterra (Cerdanyola del Vallès), Spain;
- Correspondence: (M.B.); (J.B.-A.)
| | - Julio Bastos-Arrieta
- Physical Chemistry TU Dresden, Zellescher Weg 19, 01069 Dresden, Germany
- Correspondence: (M.B.); (J.B.-A.)
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Muñoz J, Montes R, Baeza M. Trends in electrochemical impedance spectroscopy involving nanocomposite transducers: Characterization, architecture surface and bio-sensing. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.08.012] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Highly sensitive electrochemical immunosensor for IgG detection based on optimized rigid biocomposites. Biosens Bioelectron 2016; 78:505-512. [DOI: 10.1016/j.bios.2015.11.081] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 11/25/2015] [Accepted: 11/27/2015] [Indexed: 11/21/2022]
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Liu W, Zhang H, Yang B, Li Z, Lei L, Zhang X. A non-enzymatic hydrogen peroxide sensor based on vertical NiO nanosheets supported on the graphite sheet. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.04.037] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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