Karolína Šišková

2011

• 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

• 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,