Grzegorz Gabka
Warsaw University of Technology
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Featured researches published by Grzegorz Gabka.
Inorganic Chemistry | 2014
Grzegorz Gabka; Piotr Bujak; Kamila Giedyk; Andrzej Ostrowski; Karolina Malinowska; Jerzy Herbich; Barbara Golec; Ireneusz Wielgus; Adam Pron
A convenient method of the preparation of alloyed quaternary Ag-In-Zn-S nanocrystals is elaborated, in which a multicomponent mixture of simple and commercially available precursors, namely, silver nitrate, indium(III) chloride, zinc stearate, 1-dodecanethiol, and sulfur, is used with 1-octadecene as a solvent. The formation of quaternary nanocrystals necessitates the use of an auxiliary sulfur precursor, namely, elemental sulfur dissolved in oleylamine, in addition to 1-dodecanethiol. Without this additional precursor binary ZnS nanocrystals are formed. The optimum reaction temperature of 180 °C was also established. In these conditions shape, size, and composition of the resulting nanocrystals can be adjusted in a controlled manner by changing the molar ratio of the precursors in the reaction mixture. For low zinc stearate contents anisotropic rodlike (ca.3 nm x 10 nm) and In-rich nanocrystals are obtained. This is caused by a significantly higher reactivity of the indium precursor as compared to the zinc one. With increasing zinc precursor content the reactivities of both precursors become more balanced, and the resulting nanocrystals are smaller (1.5-4.0 nm) and become Zn-rich as evidenced by transmission electron microscopy, X-ray diffraction, and energy-dispersive spectrometry investigations. Simultaneous increases in the zinc and sulfur precursor content result in an enlargement of nanocrystals (2.5 to 5.0 nm) and further increase in the molar ZnS content (up to 0.76). The prepared nanoparticles show stable photoluminescence with the quantum yield up to 37% for In and Zn-rich nanocrystals. Their hydrodynamic diameter in toluene dispersion, determined by dynamic light scattering, is roughly twice larger than the diameter of their inorganic core.
Inorganic Chemistry | 2016
Grzegorz Gabka; Piotr Bujak; Andrzej Ostrowski; Waldemar Tomaszewski; Wojciech Lisowski; Janusz W. Sobczak; Adam Pron
Cu-Fe-S nanocrystals exhibiting a strong localized surface plasmon resonance (LSPR) effect were synthesized for the first time. The elaborated reproducible preparation procedure involved copper(II) oleate, iron(III) stearate, and sulfur powder dissolved in oleylamine (OLA) as precursors. The wavelength of the plasmonic resonance maximum could be tuned by changing the Cu/Fe ratio in the resulting nanocrystals, being the most energetic for the 1:1 ratio (486 nm) and undergoing a bathochromic shift to ca. 1200 nm with an increase to 6:1. LSPR could also be observed in nanocrystals prepared from the same metal precursors and sulfur powder dissolved in 1-octadecene (ODE), provided that the sulfur precursor was taken in excess. Detailed analysis of the reaction mixture by chromatographic techniques, supplemented by mass spectrometry and (1)H NMR spectroscopy enabled the identification of the true chemical nature of the sulfur precursor in S/OLA, namely, (C18H35NH3(+))(C18H35NH-S8(-)), a reactive product of the reduction of elemental sulfur by the amine groups of OLA. In the case of the S/ODE precursor, the true precursors are much less reactive primary or secondary thioethers and dialkyl polysulfides.
Chemical Communications | 2015
Grzegorz Gabka; Piotr Bujak; Maciej Gryszel; Andrzej Ostrowski; Karolina Malinowska; Grazyna Zofia Zukowska; Fabio Agnese; Adam Pron; Peter Reiss
Physical Chemistry Chemical Physics | 2014
Grzegorz Gabka; Piotr Bujak; Kamila Giedyk; Kamil Kotwica; Andrzej Ostrowski; Karolina Malinowska; Wojciech Lisowski; Janusz W. Sobczak; Adam Pron
Physical Chemistry Chemical Physics | 2016
Grzegorz Gabka; Piotr Bujak; J. Żukrowski; Damian Zabost; Kamil Kotwica; Karolina Malinowska; Andrzej Ostrowski; Ireneusz Wielgus; Wojciech Lisowski; Janusz W. Sobczak; Marek Przybylski; Adam Pron
Journal of Physical Chemistry C | 2015
Grzegorz Gabka; Piotr Bujak; Maciej Gryszel; Kamil Kotwica; Adam Pron
Physical Chemistry Chemical Physics | 2017
Grzegorz Gabka; Piotr Bujak; Kamil Kotwica; Andrzej Ostrowski; Wojciech Lisowski; Janusz W. Sobczak; Adam Pron
Synthetic Metals | 2014
Grzegorz Gabka; Klaudyna Leniarska; Andrzej Ostrowski; Karolina Malinowska; Lukasz Skorka; Mikolaj Donten; Piotr Bujak
Journal of Physical Chemistry C | 2017
J. Żukrowski; A. Błachowski; K. Komędera; K. Ruebenbauer; Grzegorz Gabka; Piotr Bujak; Adam Pron; M. Przybylski
Materials Chemistry and Physics | 2015
Grzegorz Gabka; Klaudyna Leniarska; Andrzej Ostrowski; Karolina Malinowska; Mikolaj Donten; Piotr Bujak