Email: karolina.siskova@upol.cz
Location: Šlechtitelů 11, Olomouc
Phone: (+420) 58 563 4955
Fax: (+420) 58 563 4958
Oblast výzkumu:
Preparation and application of noble metal and semi-conductive nanoparticles
Surface modification of nanoparticles
Photo-active materials
SERS (surface-enhanced Raman scattering spectroscopy)
Laser ablativ
Kvalifikace:
Mgr.: Physical Chemistry, Charles University
Ph.D.: Physical Chemistry, Charles UniversityInterface of Physics
Chemistry and Computing Science with Biology, University Paris VI
Publications
2011
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J. Filip, R. A. Yngard, K. Siskova, Z. Marusak, V. Ettler, P. Sajdl, V. K. Sharma, and R. Zboril, “Mechanisms and Efficiency of the Simultaneous Removal of Metals and
Cyanides by Using Ferrate(VI): Crucial Roles of Nanocrystalline
Iron(III) Oxyhydroxides and Metal Carbonates,” CHEMISTRY-A EUROPEAN JOURNAL, vol. 17, iss. 36, pp. 10097-10105, 2011.
[Bibtex]@article ISI:000295357800031, Author = Filip, Jan and Yngard, Ria A. and Siskova, Karolina and Marusak, Zdenek and Ettler, Vojtech and Sajdl, Petr and Sharma, Virender K. and Zboril, Radek, Title = Mechanisms and Efficiency of the Simultaneous Removal of Metals and Cyanides by Using Ferrate(VI): Crucial Roles of Nanocrystalline Iron(III) Oxyhydroxides and Metal Carbonates, Journal = CHEMISTRY-A EUROPEAN JOURNAL, Year = 2011, Volume = 17, Number = 36, Pages = 10097-10105, Month = AUG, Abstract = The reaction of potassium ferrate(VI), K(2)FeO(4), with weak-acid dissociable cyanides-namely, K(2)[Zn(CN)(4)], K(2)[Cd(CN)(4)], K(2)[Ni(CN)(4)], and K(3)[Cu(CN)(4)]-results in the formation of iron(III) oxyhydroxide nanoparticles that differ in size, crystal structure, and surface area. During cyanide oxidation and the simultaneous reduction of iron(VI), zinc(II), copper(II), and cadmium(II), metallic ions are almost completely removed from solution due to their co-precipitation with the iron(III) oxyhydroxides including 2-line ferrihydrite, 7-line ferrihydrite, and/or goethite. Based on the results of XRD, Mossbauer and IR spectroscopies, as well as TEM, X-ray photoelectron emission spectroscopy, and Brunauer-Emmett-Teller measurements, we suggest three scavenging mechanisms for the removal of metals including their incorporation into the ferrihydrite crystal structure, the formation of a separate phase, and their adsorption onto the precipitate surface. Zn and Cu are preferentially and almost completely incorporated into the crystal structure of the iron(III) oxyhydroxides; the formation of the Cd-bearing, X-ray amorphous phase, together with Cd carbonate is the principal mechanism of Cd removal. Interestingly, Ni remains predominantly in solution due to the key role of nickel(II) carbonate, which exhibits a solubility product constant several orders of magnitude higher than the carbonates of the other metals. Traces of Ni, identified in the iron(III) precipitate, are exclusively adsorbed onto the large surface area of nanoparticles. We discuss the relationship between the crystal structure of iron(III) oxyhydroxides and the mechanism of metal removal, as well as the linear relationship observed between the rate constant and the surface area of precipitates., DOI = 10.1002/chem.201100711, ISSN = 0947-6539, Unique-ID = ISI:000295357800031, -
K. Siskova, K. Safarova, J. H. Seo, R. Zboril, and M. Mashlan, “Non-chemical approach toward 2D self-assemblies of Ag nanoparticles via
cold plasma treatment of substrates,” NANOTECHNOLOGY, vol. 22, iss. 27, 2011.
[Bibtex]@article ISI:000291021200028, Author = Siskova, Karolina and Safarova, Klara and Seo, Jung Hwa and Zboril, Radek and Mashlan, Miroslav, Title = Non-chemical approach toward 2D self-assemblies of Ag nanoparticles via cold plasma treatment of substrates, Journal = NANOTECHNOLOGY, Year = 2011, Volume = 22, Number = 27, Month = JUL 8, Abstract = The nano-modification of selected substrates by means of atmospheric cold plasma treatment was exploited for the two-dimensional (2D) self-assembling of silver nanoparticles (Ag NPs). Such a useful combination of the cold plasma treatment of substrate surface and an immediate easy deposition of Ag NPs creating the 2D self-assemblies on the substrates is published for the first time, to the best of our knowledge. Except for the cold plasma treatment, mainly the following parameters influenced the resulting NP assemblies: the choice of solvent mixture, concentration of Ag NP dispersions, and the deposition technique. The 2D self-assemblies of Ag NPs, providing the same work function as a Ag electrode, were formed on the cold plasma-treated substrates when a drop-casting technique was employed. The possibility of an easy preparation of the Ag NP 2D self-assemblies on substrates without using any chemical agents and/or evaporating chamber could be exploited, e.g. in photovoltaic and light-emitting diode devices., DOI = 10.1088/0957-4484/22/27/275601, Article-Number = 275601, ISSN = 0957-4484, Unique-ID = ISI:000291021200028, -
K. Siskova, B. Vlckova, P. Turpin, A. Thorel, and M. Prochazka, “Laser Ablation of Silver in Aqueous Solutions of Organic Species:
Probing Ag Nanoparticle-Adsorbate Systems Evolution by Surface-Enhanced
Raman and Surface Plasmon Extinction Spectra,” JOURNAL OF PHYSICAL CHEMISTRY C, vol. 115, iss. 13, pp. 5404-5412, 2011.
[Bibtex]@article ISI:000288885900028, Author = Siskova, Karolina and Vlckova, Blanka and Turpin, Pierre-Yves and Thorel, Alain and Prochazka, Marek, Title = Laser Ablation of Silver in Aqueous Solutions of Organic Species: Probing Ag Nanoparticle-Adsorbate Systems Evolution by Surface-Enhanced Raman and Surface Plasmon Extinction Spectra, Journal = JOURNAL OF PHYSICAL CHEMISTRY C, Year = 2011, Volume = 115, Number = 13, Pages = 5404-5412, Month = APR 7, Abstract = Laser ablation (LA) of a Ag target in aqueous solutions of some strongly adsorbing ions resulted in formation of chemically modified Ag nanoparticles (NPs). A prospective development of this approach into a one-pot synthesis of hybrid Ag NPs-organic species systems is conditioned by assessment of the factors affecting the hybrid system formation and stability during LA. In this study, intermittent LA of a Ag target accompanied by fragmentation of growing Ag NPs was carried out in aqueous solutions of 2,2'-bipyridine and/or of a cationic free-base porphyrin with nanosecond laser pulses of 1064 and 532 inn wavelengths. Ag NP/organic adsorbate systems resulting from each of the individual stages of the LA process were probed by SERS (surface-enhanced Raman scattering) and SPE (surface plasmon extinction) spectral measurements. The morphologies of selected systems were visualized by TEM (transmission electron microscopy). The efficiency of Ag NP fragmentation during LA (which corresponds to the efficiency of laser pulse absorption by the NPs) and the rate of the organic molecules' thermal desorption from the surfaces of Ag NPs heated by the laser pulse absorption have been recognized as crucial factors affecting the hybrid system stability., DOI = 10.1021/jp110907d, ISSN = 1932-7447, Unique-ID = ISI:000288885900028, -
K. Siskova, M. Kubala, P. Dallas, D. Jancik, A. Thorel, P. Ilik, and R. Zboril, “The effect of surface modification on the fluorescence and morphology of
CdSe nanoparticles embedded in a 3D phosphazene-based matrix:
nanowire-like quantum dots,” JOURNAL OF MATERIALS CHEMISTRY, vol. 21, iss. 4, pp. 1086-1093, 2011.
[Bibtex]@article ISI:000286110400023, Author = Siskova, Karolina and Kubala, Martin and Dallas, Panagiotis and Jancik, Dalibor and Thorel, Alain and Ilik, Petr and Zboril, Radek, Title = The effect of surface modification on the fluorescence and morphology of CdSe nanoparticles embedded in a 3D phosphazene-based matrix: nanowire-like quantum dots, Journal = JOURNAL OF MATERIALS CHEMISTRY, Year = 2011, Volume = 21, Number = 4, Pages = 1086-1093, Abstract = We have synthesized and characterized a new type of emissive nanocomposite material consisting of a 3D inorganic-organic phosphazene-based polymer and CdSe quantum dots (QDs). The materials uniquely combine and inherit the polymers 3D character and the QD fluorescence properties. Furthermore, we have proven that benzidine molecules are suitable surface-modifiers of QDs resulting in fluorescent, nearly spherical QDs arranged into the unique nanowire-like structure. Moreover, the benzidine-to-CdSe energy transfer has been observed which can be further exploited. Characterization of the as-synthesized materials has been performed by using UV-visible and FT-IR absorption spectroscopy, energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), high resolution-transmission electron microscopy (HR-TEM), scanning electron microscopy (SEM), steady-state and time-resolved fluorescence measurements., DOI = 10.1039/c0jm02360d, ISSN = 0959-9428, Unique-ID = ISI:000286110400023,
2010
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K. Siskova, J. Pfleger, and M. Prochazka, “Stabilization of Au nanoparticles prepared by laser ablation in
chloroform with free-base porphyrin molecules,” APPLIED SURFACE SCIENCE, vol. 256, iss. 9, pp. 2979-2987, 2010.
[Bibtex]@article ISI:000274153800052, Author = Siskova, Karolina and Pfleger, Jiri and Prochazka, Marek, Title = Stabilization of Au nanoparticles prepared by laser ablation in chloroform with free-base porphyrin molecules, Journal = APPLIED SURFACE SCIENCE, Year = 2010, Volume = 256, Number = 9, Pages = 2979-2987, Month = FEB 15, Abstract = S. Laser ablation (LA) of a Au foil immersed in chloroform and/or in diluted 5,10,15,20-tetrakis-4-pyridylporphine (TPyP) chloroform solutions was carried out using 1064 nm nanosecond laser pulses. The products were characterized by UV-visible-NIR optical extinction and IR absorption measurements, Raman spectroscopy and transmission electron microscopy (TEM). They were found to be strongly influenced by the convergence of the incident laser beam and delivered energy per pulse. Our results show that with highly focused laser beam chloroform underwent photochemical reactions and no nanoparticles with observable surface plasmon extinction (SPE) band were formed whereas at particular focusing conditions Au nanoparticles with the SPE band typical for Au organosols were created. Au organosols in pure chloroform showed a limited stability, the SPE band disappeared in a few hours after the preparation. When a small amount of TPyP was present in the course of LA both the efficiency of Au nanoparticles formation and the stability of the resulting organosols were improved. A possible mechanism of LA of the Au target in chloroform and in diluted TPyP chloroform solutions is discussed. (C) 2009 Elsevier B. V. All rights reserved., DOI = 10.1016/j.apsusc.2009.11.061, ISSN = 0169-4332, Unique-ID = ISI:000274153800052,