31. Cationic Covalent Organic Polymer Thin Film for Label-free Electrochemical Bacterial Cell DetectionTina Skorjanc, Andraž Mavrič, Mads Nybo Sorensen, Gregor Mali, Changzhu Wu, Matjaž Valant, 2022, original scientific article Keywords: Bacteria, Electrical properties, Electrochemical cells, Electrodes, Sensors Published in RUNG: 26.09.2022; Views: 1190; Downloads: 24 Full text (4,87 MB) |
32. Covalent polymer thin films for biosensor applicationsTina Skorjanc, Andraž Mavrič, Mads Nybo Sorensen, Gregor Mali, Changzhu Wu, Matjaž Valant, 2022, published scientific conference contribution abstract Keywords: bacteria, sensing, electrochemical impedance spectroscopy, electrophoresis, electrode preparation, Menshutkin reaction Published in RUNG: 26.09.2022; Views: 1208; Downloads: 0 This document has many files! More... |
33. Deposition of porphyrin thin films by electrophoresisAndraž Mavrič, Tina Škorjanc, Mads Nybo Sørensen, Changzhu Wu, Matjaž Valant, 2022, published scientific conference contribution abstract Abstract: Porphyrins are heterocyclic macrocycles consisting of interconnected pyrrole subunits acting as ligands for metal ions. Metallised metalloporphyrins naturally occur as cofactors in a series of enzymes, acting as active sites for biochemical transformations. Mimicking nature, a variety of functionalized porphyrins have been prepared for different catalytic purposes [1]. These organometallic complexes have isolated metal centers in tailored coordination environments to drive catalytic reactions in homogeneous solutions. The activity and selectivity of isolated metal ions acting as single-atom catalysts are defined by the coordination environment.
Depending on the porphyrin structure, the solubility of these macrocycles and their processability in solutions can be altered. While such adjustments to the structure might ease the processability, the catalytic properties might also be altered. Because homogenous catalysis presents challenges with the separation and recyclability of the catalyst, it is common to fix metalloporphyrins into molecular organic frameworks or deposit them onto a substrate. Commonly used deposition techniques face several challenges. For instance, thermal evaporation can cause partial or complete degradation of some thermally-labile functional groups attached to the porphyrins. Similarly, spin coating commonly results in an uneven thickness and uneven morphology of the deposited films.
To overcome these difficulties, we present an alternative method for the deposition of porphyrin thin films that is suitable for a wide range of functionalized porphyrins. The electrophoresis can force the molecules to deposit on a conductive substrate such as a metal foil or transparent conductive oxide by applying the electric field generated by a DC power supply. The film thickness can be precisely controlled by changing the voltage value, deposition time, or solution concentration using even a small amount of material [2, 3]. Six different functionalized porphyrin molecules have been successfully deposited onto the copper foil substrate by optimizing key parameters, including applied electric field, the duration of electrophoresis, the size of the copper electrodes, and solvent polarity. To demonstrate the generality of our approach, we have selected a broad range of porphyrins that incorporate the following functional groups: phenyl rings, carboxylic acids, pyridyl rings, methyl benzyl ethers, methyl benzoyl esters, and cobalt (II) metalized macrocycle. The impact of this study extends above catalysis to various applications of porphyrins thin films on conductive substrates such as optoelectronics and sensors. Keywords: porphyrin, thin film, electrophoresis Published in RUNG: 26.09.2022; Views: 1138; Downloads: 0 This document has many files! More... |
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35. Iron phosphide precatalyst for electrocatalytic degradation of rhodamine B dye and removal of Escherichia coli from simulated wastewaterTakwa Chouki, Manel Machreki, Jelena Topić, Lorena Butinar, Plamen Stefanov, Erika Jež, Jack S. Summers, Matjaž Valant, Aaron Fait, Saim Emin, 2022, original scientific article Keywords: železov fosfat, elektrokataliza, rodamin Published in RUNG: 02.08.2022; Views: 1488; Downloads: 96 Link to full text This document has many files! More... |
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39. O[sub]2 loaded germanosilicate optical fibers : experimental in situ investigation and ab initio simulation study of GLPC evolution under irradiationImène Reghioua, Luigi Giacomazzi, Antonino Alessi, Blaž Winkler, Layla Martin-Samos, Sylvain Girard, Diego Di Francesca, Mattia Fanetti, Nicolas Richard, Matjaž Valant, 2022, original scientific article Keywords: optical fiber, O2 loading, point defects Published in RUNG: 25.04.2022; Views: 1579; Downloads: 29 Link to full text This document has many files! More... |
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