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Touni A, Liu X, Kang X, Carvalho PA, Diplas S, Both KG, Sotiropoulos S, Chatzitakis A. Galvanic Deposition of Pt Nanoparticles on Black TiO 2 Nanotubes for Hydrogen Evolving Cathodes. ChemSusChem 2021; 14:4993-5003. [PMID: 34478230 PMCID: PMC9291612 DOI: 10.1002/cssc.202101559] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 08/23/2021] [Indexed: 05/06/2023]
Abstract
A galvanic deposition method for the in-situ formation of Pt nanoparticles (NPs) on top and inner surfaces of high-aspect-ratio black TiO2 -nanotube electrodes (bTNTs) for true utilization of their total surface area has been developed. Density functional theory calculations indicated that the deposition of Pt NPs was favored on bTNTs with a preferred [004] orientation and a deposition mechanism occurring via oxygen vacancies, where electrons were localized. High-resolution transmission electron microscopy images revealed a graded deposition of Pt NPs with an average diameter of around 2.5 nm along the complete nanotube axis (length/pore diameter of 130 : 1). Hydrogen evolution reaction (HER) studies in acidic electrolytes showed comparable results to bulk Pt (per geometric area) and Pt/C commercial catalysts (per mg of Pt). The presented novel HER cathodes of minimal engineering and low noble metal loadings (μg cm-2 range) achieved low Tafel slopes (30-34 mV dec-1 ) and high stability in acidic conditions. This study provides important insights for the in-situ formation and deposition of NPs in high-aspect-ratio structures for energy applications.
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Affiliation(s)
- Aikaterini Touni
- Department of ChemistryAristotle University of Thessaloniki54124ThessalonikiGreece
| | - Xin Liu
- Centre for Materials Science and NanotechnologyDepartment of ChemistryUniversity of OsloGaustadalléen 210349OsloNorway
| | - Xiaolan Kang
- Centre for Materials Science and NanotechnologyDepartment of ChemistryUniversity of OsloGaustadalléen 210349OsloNorway
| | | | - Spyros Diplas
- Centre for Materials Science and NanotechnologyDepartment of ChemistryUniversity of OsloGaustadalléen 210349OsloNorway
- SINTEF IndustryPOB 124 Blindern0314OsloNorway
| | - Kevin G. Both
- Centre for Materials Science and NanotechnologyDepartment of ChemistryUniversity of OsloGaustadalléen 210349OsloNorway
| | | | - Athanasios Chatzitakis
- Centre for Materials Science and NanotechnologyDepartment of ChemistryUniversity of OsloGaustadalléen 210349OsloNorway
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Dimitrova N, Banti A, Spyridou ON, Papaderakis A, Georgieva J, Sotiropoulos S, Valova E, Armyanov S, Tatchev D, Hubin A, Baert K. Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Touni A, Grammenos OA, Banti A, Karfaridis D, Prochaska C, Lambropoulou D, Pavlidou E, Sotiropoulos S. Iridium oxide-nickel-coated titanium anodes for the oxygen evolution reaction. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138866] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Touni A, Papaderakis A, Karfaridis D, Banti A, Mintsouli I, Lambropoulou D, Sotiropoulos S. Oxygen evolution at IrO2-modified Ti anodes prepared by a simple galvanic deposition method. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113485] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Touni A, Papaderakis A, Karfaridis D, Vourlias G, Sotiropoulos S. Oxygen Evolution Reaction at IrO 2/Ir(Ni) Film Electrodes Prepared by Galvanic Replacement and Anodization: Effect of Precursor Ni Film Thickness. Molecules 2019; 24:E2095. [PMID: 31159428 PMCID: PMC6600157 DOI: 10.3390/molecules24112095] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 11/16/2022] Open
Abstract
IrO2/Ir(Ni) film electrodes of variable Ni content have been prepared via a galvanic replacement method, whereby surface layers of pre-deposited Ni are replaced by Ir, followed by electrochemical anodization. Electrodeposition of Ni on a glassy carbon electrode support has been carried out at constant potential and the charge of electrodeposited Ni controlled so as to investigate the effect of precursor Ni layer thickness on the electrocatalytic activity of the corresponding IrO2/Ir(Ni)/GC electrodes for the oxygen evolution reaction (OER). After their preparation, these electrodes were characterized by microscopic (SEM) and spectroscopic (EDS, XPS) techniques, revealing the formation of Ir deposits on the Ni support and a thin IrO2 layer on their surfaces. To determine the electroactive surface area of the IrO2 coatings, cyclic voltammograms were recorded in the potential range between hydrogen and oxygen evolution and the charge under the anodic part of the curves, corresponding to Ir surface oxide formation, served as an indicator of the quantity of active IrO2 in the film. The electrocatalytic activity of the coatings for OER was investigated by current-potential curves under steady state conditions, revealing that the catalysts prepared from thinner Ni films exhibited enhanced electrocatalytic performance.
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Affiliation(s)
- Aikaterini Touni
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Athanasios Papaderakis
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Dimitrios Karfaridis
- Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Georgios Vourlias
- Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - Sotirios Sotiropoulos
- Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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Dellis S, Pliatsikas N, Kalfagiannis N, Lidor-Shalev O, Papaderakis A, Vourlias G, Sotiropoulos S, Koutsogeorgis DC, Mastai Y, Patsalas P. Broadband luminescence in defect-engineered electrochemically produced porous Si/ZnO nanostructures. Sci Rep 2018; 8:6988. [PMID: 29725079 PMCID: PMC5934408 DOI: 10.1038/s41598-018-24684-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 04/03/2018] [Indexed: 11/09/2022] Open
Abstract
The fabrication, by an all electrochemical process, of porous Si/ZnO nanostructures with engineered structural defects, leading to strong and broadband deep level emission from ZnO, is presented. Such nanostructures are fabricated by a combination of metal-assisted chemical etching of Si and direct current electrodeposition of ZnO. It makes the whole fabrication process low-cost, compatible with Complementary Metal-Oxide Semiconductor technology, scalable and easily industrialised. The photoluminescence spectra of the porous Si/ZnO nanostructures reveal a correlation between the lineshape, as well as the strength of the emission, with the morphology of the underlying porous Si, that control the induced defects in the ZnO. Appropriate fabrication conditions of the porous Si lead to exceptionally bright Gaussian-type emission that covers almost the entire visible spectrum, indicating that porous Si/ZnO nanostructures could be a cornerstone material towards white-light-emitting devices.
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Affiliation(s)
- S Dellis
- Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
| | - N Pliatsikas
- Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
| | - N Kalfagiannis
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom
| | - O Lidor-Shalev
- Department of Chemistry and the Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan, Israel
| | - A Papaderakis
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
| | - G Vourlias
- Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
| | - S Sotiropoulos
- Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
| | - D C Koutsogeorgis
- School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom
| | - Y Mastai
- Department of Chemistry and the Institute of Nanotechnology, Bar-Ilan University, Ramat-Gan, Israel
| | - P Patsalas
- Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece.
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Paskhalidis C, Petropoulos D, Sotiropoulos S, Papakonstantinou L. THE EUROPEAN UNION’S COMMON AGRICULTURAL POLICY AND DEVELOPMENT OF AGRO-FOOD SECTOR IN GREECE. Vestn Ross univ družby nar , Ser Agron životnovod 2018. [DOI: 10.22363/2312-797x-2018-13-4-373-382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Papaderakis A, Tsiplakides D, Balomenou S, Sotiropoulos S. Probing the hydrogen adsorption affinity of Pt and Ir by surface interrogation scanning electrochemical microscopy (SI-SECM). Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.09.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Chatzitakis A, Papaderakis Α, Karanasios N, Georgieva J, Pavlidou E, Litsardakis G, Poulios I, Sotiropoulos S. Comparison of the photoelectrochemical performance of particulate and nanotube TiO 2 photoanodes. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.07.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Papaderakis A, Anastopoulos A, Sotiropoulos S. Electrochemical studies of processes occurring at the polycrystalline Cu electrode/methanol interface. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.11.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Vanrenterghem B, Papaderakis A, Sotiropoulos S, Tsiplakides D, Balomenou S, Bals S, Breugelmans T. The reduction of benzylbromide at Ag-Ni deposits prepared by galvanic replacement. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.02.135] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Georgieva J, Valova E, Mintsouli I, Sotiropoulos S, Tatchev D, Armyanov S, Hubin A, Dille J, Hoell A, Raghuwanshi V, Karanasios N, Malet L. Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO 2 and TiO 2 –C powder supports. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.07.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Georgieva J, Sotiropoulos S, Valova E, Armyanov S, Karanasios N. Methanol oxidation and photo-oxidation at Pt/WO3 electrocatalysts on graphite substrates. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.06.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Georgieva J, Valova E, Mintsouli I, Sotiropoulos S, Armyanov S, Kakaroglou A, Hubin A, Steenhaut O, Dille J. Carbon-supported Pt(Cu) electrocatalysts for methanol oxidation prepared by Cu electroless deposition and its galvanic replacement by Pt. J APPL ELECTROCHEM 2013. [DOI: 10.1007/s10800-013-0618-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Georgieva J, Valova E, Armyanov S, Philippidis N, Poulios I, Sotiropoulos S. Bi-component semiconductor oxide photoanodes for the photoelectrocatalytic oxidation of organic solutes and vapours: a short review with emphasis to TiO2-WO3 photoanodes. J Hazard Mater 2012; 211-212:30-46. [PMID: 22172459 DOI: 10.1016/j.jhazmat.2011.11.069] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2011] [Revised: 11/19/2011] [Accepted: 11/21/2011] [Indexed: 05/31/2023]
Abstract
The use of binary semiconductor oxide anodes for the photoelectrocatalytic oxidation of organic species (both in solution and gas phase) is reviewed. In the first part of the review, the principle of electrically assisted photocatalysis is presented, the preparation methods for the most common semiconductor oxide catalysts are briefly mentioned, while the advantages of appropriately chosen semiconductor combinations for efficient UV and visible (vis) light utilization are highlighted. The second part of the review focuses on the discussion of TiO(2)-WO(3) photoanodes (among the most studied bi-component semiconductor oxide systems) and in particular on coatings prepared by electrodeposition/electrosynthesis or powder mixtures (the focus of the authors' research during recent years). Studies concerning the microscopic, spectroscopic and photoelectrochemical characterization of the catalysts are presented and examples of photoanode activity towards typical dissolved organic contaminants as well as organic vapours are given. Particular emphasis is paid to: (a) The dependence of photoactivity on catalyst morphology and composition and (b) the possibility of carrying out photoelectrochemistry in all-solid cells, thus opening up the opportunity for photoelectrocatalytic air treatment.
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Affiliation(s)
- J Georgieva
- Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
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Pappa-Louisi A, Agrafiotou P, Sotiropoulos S. Optimal conditions for the direct RP-HPLC determination of underivatized amino acids with online multiple detection. Methods Mol Biol 2012; 828:101-114. [PMID: 22125140 DOI: 10.1007/978-1-61779-445-2_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The combined use of a dual-UV detector as well as a fluorimetric and a multielectrode electrochemical detector (equipped with a dual electrode, consisting of a conventional size 3 mm diameter glassy carbon electrode (GCE) and of a pair of 30 μm thick carbon microfibers) is proposed for the detection of the following 15 underivatized amino acids: L: -histidine (his), L: -cysteine (cys), creatine (crn), S-methyl-L: -cysteine (me-cys), DL: -homocysteine (hcy), L: -methionine (met), beta-(3,4-dihydroxyphenyl)-L: -alanine (dopa), L: -tyrosine (tyr), DL: -m-tyrosine (m-tyr), L: -a-methyl-dopa (me-dopa), L: -phenylanine (phe), DL: -alpha-methyltyrosine (me-tyr), 5-hydroxy-tryptophan (5htp), 3-nitro-L: -tyrosine (NO(2)Tyr) and L: -tryptophan (trp), as well as of two dipeptides: L: -cystathionine (cysta), L: -carnosine (car), and of creatinine (cre). A multilinear solvent (acetonitrile) gradient elution program, determined by a simple optimization algorithm, is required for the efficient reversed phase separation of the above mixture of 18 solutes within 27 min at a flow rate of 1.0 mL/min and at 25°C.
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Affiliation(s)
- A Pappa-Louisi
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
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Pappa-Louisi A, Agrafiotou P, Sotiropoulos S. Advances in Liquid Chromatographic and Voltammetric Analysis of Underivatized Amino Acids. CURR ORG CHEM 2010. [DOI: 10.2174/138527210793351535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Georgieva J, Armyanov S, Poulios I, Sotiropoulos S. An all-solid photoelectrochemical cell for the photooxidation of organic vapours under ultraviolet and visible light illumination. Electrochem commun 2009. [DOI: 10.1016/j.elecom.2009.06.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Tegou A, Papadimitriou S, Armyanov S, Valova E, Kokkinidis G, Sotiropoulos S. Corrigendum to “Oxygen reduction at platinum- and gold-coated iron, cobalt, nickel and lead deposits on glassy carbon substrates” [J. Electroanal. Chem. 623(2008) 187]. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2008.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tegou A, Papadimitriou S, Armyanov S, Valova E, Kokkinidis G, Sotiropoulos S. Oxygen reduction at platinum- and gold-coated iron, cobalt, nickel and lead deposits on glassy carbon substrates. J Electroanal Chem (Lausanne) 2008. [DOI: 10.1016/j.jelechem.2008.07.012] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Baldrianova L, Agrafiotou P, Svancara I, Vytras K, Sotiropoulos S. The determination of cysteine at Bi-powder carbon paste electrodes by cathodic stripping voltammetry. Electrochem commun 2008. [DOI: 10.1016/j.elecom.2008.04.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Tegou A, Papadimitriou S, Pavlidou E, Kokkinidis G, Sotiropoulos S. Oxygen reduction at platinum- and gold-coated copper deposits on glassy carbon substrates. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.05.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Baldrianova L, Svancara I, Sotiropoulos S. Anodic stripping voltammetry at a new type of disposable bismuth-plated carbon paste mini-electrodes. Anal Chim Acta 2007; 599:249-55. [PMID: 17870287 DOI: 10.1016/j.aca.2007.07.067] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2007] [Revised: 07/19/2007] [Accepted: 07/25/2007] [Indexed: 12/01/2022]
Abstract
A new type of disposable carbon paste mini-electrodes (CPmEs), with dimensions in the 50-300 microm range, have been fabricated by heat-shrinking the end-tip of plastic micropipette tips and filling them with carbon paste. The CPmEs have been characterized by microscopic and electrochemical means and tested as substrates for in situ plated Bi film electrodes (BiF-CPmEs), used in the determination of heavy metals by square wave anodic stripping voltammetry (SWASV). It was found that this new class of CPmEs combines the advantages of carbon paste electrodes (readily renewable surface and high surface area) with those of near-microelectrode behaviour (no stirring or electrolyte excess needed). During SWASV experiments in unstirred Pb(II) and Cd(II) solutions well-shaped stripping peaks were obtained whose height varied linearly with analyte concentration in the wide 1x10(-8) to 10(-6) M range, both in acetate buffer and unbuffered solutions. Under optimal conditions detection limits of 8x10(-10) and 1.3x10(-9) M were achieved for Pb(II) and Cd(II), respectively and in a trial application, these metal ions have been determined in a spiked tap water sample using a BiF-CPmE.
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Affiliation(s)
- L Baldrianova
- Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, CZ-532 10 Pardubice, Czech Republic
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Baldrianova L, Svancara I, Economou A, Sotiropoulos S. Anodic stripping voltammetry at in situ bismuth-plated carbon and gold microdisc electrodes in variable electrolyte content unstirred solutions. Anal Chim Acta 2006; 580:24-31. [PMID: 17723752 DOI: 10.1016/j.aca.2006.07.051] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Revised: 07/14/2006] [Accepted: 07/21/2006] [Indexed: 11/16/2022]
Abstract
Carbon and gold microdisc electrodes (30 and 10 microm, respectively) have been tested as substrates for in situ bismuth film plating from unstirred solutions of variable acetate buffer content and were subsequently used in the anodic stripping voltammetry determination of Pb(II) and Cd(II) ions. The effects of Bi(III) concentration, analyte accumulation time, stirring as well as supporting electrolyte content have been studied. Under optimal conditions good voltammetric responses were obtained by means of square wave anodic stripping voltammetry in unstirred analyte solutions of 5 x 10(-8) to 10(-6)M, even in the absence of added buffer. In an indicative application, Pb(II) ion levels were determined in tap water using bismuth-plated carbon microdisc electrodes.
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Affiliation(s)
- L Baldrianova
- Department of Analytical Chemistry, Faculty of Chemical-Technology, University of Pardubice, CZ-532 10 Pardubice, Czech Republic
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Georgieva J, Armyanov S, Valova E, Poulios I, Sotiropoulos S. Preparation and photoelectrochemical characterisation of electrosynthesised titanium dioxide deposits on stainless steel substrates. Electrochim Acta 2006. [DOI: 10.1016/j.electacta.2005.07.017] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Georgieva J, Armyanov S, Valova E, Tsacheva T, Poulios I, Sotiropoulos S. Photoelectrochemical behaviour of electrodeposited tungsten trioxide and electrosynthesised titanium dioxide single component and bilayer coatings on stainless steel substrates. J Electroanal Chem (Lausanne) 2005. [DOI: 10.1016/j.jelechem.2005.07.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Agrafiotou P, Maliakas C, Pappa-Louisi A, Sotiropoulos S. A general approach to the derivation of peak area flow dependence in FIA and HPLC amperometric detection. Electrochim Acta 2003. [DOI: 10.1016/s0013-4686(03)00271-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nikitas P, Sotiropoulos S, Papadopoulos N. Thermodynamics of micellization at charged interphases within the framework of the phase-separation model. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100200a047] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Pappa-Louisi A, Papageorgiou A, Zitrou A, Sotiropoulos S, Georgarakis E, Zougrou F. Study on the electrochemical detection of the macrolide antibiotics clarithromycin and roxithromycin in reversed-phase high-performance liquid chromatography. J Chromatogr B Biomed Sci Appl 2001; 755:57-64. [PMID: 11393733 DOI: 10.1016/s0378-4347(00)00614-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The optimal conditions of the amperometric detection of the macrolide antibiotics clarithromycin and roxithromycin were found by cyclic voltammetric studies and HPLC-electrochemical detection responses obtained in different temperatures (25.5-60 degrees C) and different but almost isoelutropic binary, ternary and quaternary mixtures of aqueous buffer (pH 7), methanol, acetonitrile and isopropanol. These conditions were also proved to be applicable for the quantitative detection of clarithromycin in human plasma using roxithromycin as an internal standard and vice versa. It was demonstrated that increased attention has to be paid to eluent composition and column temperature to ensure sensitive and reproducible electrochemical responses as well as regularly shaped peaks for both macrolides tested.
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Affiliation(s)
- A Pappa-Louisi
- Department of Chemistry, Aristotle University of Thessaloniki, Greece.
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Pletcher D, Sotiropoulos S. Hydrogen adsorption–desorption and oxide formation–reduction on polycrystalline platinum in unbuffered aqueous solutions. ACTA ACUST UNITED AC 1994. [DOI: 10.1039/ft9949003663] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sotiropoulos S, Nikitas P, Papadopoulos N. Adsorption of sodium dodecylsulphate on mercury as an example of micellization within a multilayer interphase. J Electroanal Chem (Lausanne) 1993. [DOI: 10.1016/0022-0728(93)80521-i] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Papadopoulos N, Sotiropoulos S, Nikitas P. Equilibrium and kinetic properties of cetyl-dimethyl-benzyl-ammonium chloride at the mercury/electrolytic solution interface by means of phase sensitive three-dimensional AC voltammetry. J Colloid Interface Sci 1992. [DOI: 10.1016/0021-9797(92)90500-l] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Papadopoulos N, Sotiropoulos S, Nikitas P. Three-dimensional phase-sensitive ac voltammetry for the study of adsorption processes. J Electroanal Chem (Lausanne) 1992. [DOI: 10.1016/0022-0728(92)80057-b] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nikitas P, Sotiropoulos S. Thermodynamic methods for analysis of adsorption data of organic compounds at electrified interfaces. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/0022-0728(91)87001-k] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sotiropoulos S, Chafetz NI, Lang P, Winkler M, Morris JM, Weinstein PR, Genant HK. Differentiation between postoperative scar and recurrent disk herniation: prospective comparison of MR, CT, and contrast-enhanced CT. AJNR Am J Neuroradiol 1989; 10:639-43. [PMID: 2501998 PMCID: PMC8334527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Twenty-five symptomatic postlumbar surgery patients had findings on lumbar spinal noncontrast CT that were equivocal for distinguishing recurrent disk herniation from postoperative epidural fibrosis (scar). Contrast-enhanced CT and lumbar MR imaging were performed to differentiate these two conditions. Of the 14 levels, surgically explored, the diagnosis of scar or recurrent disk herniation was correct with contrast-enhanced CT at 10 levels and with MR imaging at 11 levels. At the levels operated on less than 2 years prior to MR imaging, scar more frequently demonstrated intermediate than low signal intensity. Scar older than 2 years most often showed low signal intensity. These preliminary findings suggest that MR may be useful in differentiating postoperative fibrosis from recurrent disk herniation in a significant proportion of patients whose unenhanced CT scans are equivocal.
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Affiliation(s)
- S Sotiropoulos
- Department of Radiology, University of California, San Francisco 94143
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