Kaja SpilarewiczJagiellonian University | UJ · Department of Inorganic Chemistry
Kaja Spilarewicz
PhD
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23
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Publications (23)
Silver nanoparticles (AgNPs) were grown on the surface of titanium dioxide coating (TiO2) using a photochemical method. The size and number of AgNPs were monitored using scanning electron microscopy (SEM) after 20, 30, 180 and 300 seconds of UV illumination. It was found that for short illumination times (20 s) a significant number of small nanopar...
The goal of the presented investigation was to study the differences in the decoration of graphene sheets, having various amounts of oxygen containing functional groups, with silver nanoparticles (AgNPs). The reduction of graphehe oxide (GO) was performed with the use of ascorbic acid (AA), leading to partially-reduced graphene oxide (PRGO) and red...
This work aimed to revise the mechanism of photocatalytic activity of the TiO2/Ag2O system in photocatalytic water splitting accompanied by methanol photoreforming. The transformation of Ag2O into silver nanoparticles (AgNPs) during photocatalytic water splitting/methanol photoreforming was monitored using XRD, XPS, SEM, UV-vis, and DRS techniques....
Composites of semiconductors forming various heterojunctions have become more and more extensively explored in photocatalysis, but the heterojunction classification seems abstruse. This paper aims to present a strategy for correctly elucidating the heterojunction type. The following guidelines are proposed: (I) the determination of band alignment,...
In the search of the ideal bone implant material, surface initiated atom transfer radical polymerization (SI-ATRP) techniques were successfully employed to modify the polyetheretherketone (PEEK) surface with complex architecture nanolayers featuring hydrophilic poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) or poly(2-hydroxyethyl methacrylate)...
The results of this work cover the influence of plasmonic (gold) and non-plasmonic (palladium) nanostructures on the photocatalytic activity and redox properties of titanium dioxide. Materials decorated with gold, palladium and both materials were examined using photoelectrochemical and spectroelectrochemical methods to establish the changes introd...
The paper presents the possibility to synthesize immiscible with water, well-defined poly(meth)acrylates via supplemental activation and reducing agent atom transfer radical polymerization (SARA ATRP) in a miniemulsion environment, using a copper wire (Cu0) as reducing agent and supplemental activator. This is the first example of interfacial and i...
The article presents a step-by-step protocol, designed on the basis of principles of green chemistry, for the synthesis of polymer brushes with complex structure via surface-initiated atom transfer radical polymerization (SI-ATRP) approach. The selection of anionic (poly(acrylic acid), PAA) and cationic (poly(2-(dimethylamino)ethyl methacrylate, PD...
Differential pulse and cyclic voltammetry were used to investigate the electrocatalytic effects of two oxygen-containing graphene derivatives, as surface modifiers, on the oxidation mechanism of acemetacin (ACM), a non-steroidal anti-inflammatory drug. Scanning electron microscopy was employed to examine the modified electrodes surfaces, showing th...
The analytical performance of the clay paste electrode and graphene paste electrode was compared using square wave voltammetry (SWV) and cyclic voltammetry (CV). The comparison was made on the basis of a paracetamol (PA) determination on both working electrodes. The influence of pH and SWV parameters was investigated. The linear concentration range...
This paper discusses the electrochemical behavior of antiviral drug Tenofovir (TFV) and its possible applicability towards electroanalytical determination with diverse detection strategies using square-wave voltammetry. Namely, oxidation processes were investigated using glassy carbon electrode with graphene oxide surface modification (GO/GCE), whi...
Graphene oxide or reduced graphene oxide-TiO2 (TGO or TRGO) nanocomposites were decorated with Ag nanoparticles (AgNPs) using the photoreduction method. The photocatalytic growth of AgNPs on TGO and TRGO nanocomposites was compared, while keeping the other parameters (i.e., thickness, chemical composition, crystalline structure and the percentage o...
This work is focused on photocatalytic properties of titanium dioxide thin coatings modified with silver nanostructures (AgNSs) and graphene oxide (GO) sheets which were analyzed in processes of chemical transformations of rhodamine B (RhB) under ultraviolet (UV) or visible light (Vis) irradiation, respectively. UV-Vis spectroscopy was applied to a...
In present work, the stability and photochemical transformations of graphene oxide (GO) under UV irradiation in water dispersion, and during photocatalytic processes, in the system containing TiO2 thin films, were examined. Under UV light, the appearance of defects in GO flakes structure was observed, and the intensification of flakes deterioration...
The photocatalytic process of arachidic acid decomposition on titanium dioxide in the form of polycrystalline anatase and on titanium dioxide modified by silver nanoparticles (AgNPs/TiO2) was observed using atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FT-IR). Arachidic acid (AA) was chosen as a model pollutant because...
Highly ordered two-dimensional porous TiO2 coatings (HOP) were obtained using the sol–gel method and polystyrene (PS) template arranged by self-assembly. The size of the obtained pores was 302 nm, which is less than the size of the PS beads used as a template (320 nm), due to material shrinkage during calcination. Non-ordered porous (NOP) and non-p...
Questions
Question (1)
I' d like to measure the area of flat graphene flakes deposited on the flat surface of substrate.
Please suggest to me a free computer program, which I can use to measure the area of unregular flat shapes defined in nm2 from SEM images.
If you have any other propositions, please let me know how can I solve that research problem.