Partner: Mateusz Tokarczyk

University of Warsaw (PL)

Recent publications
1.Krajewski M., Liao P.Y., Michalska M., Tokarczyk M., Lin J.Y., Hybrid electrode composed of multiwall carbon nanotubes decorated with magnetite nanoparticles for aqueous supercapacitors, Journal of Energy Storage, ISSN: 2352-152X, DOI: 10.1016/j.est.2019.101020, Vol.26, pp.101020-101020, 2019
Abstract:

This work describes a use of a composite nanomaterial which consists of multiwall carbon nanotubes covered by iron oxide nanoparticles as a hybrid electrode in aqueous supercapacitor. The investigated nanomaterial was manufactured in a two-step simple chemical synthesis in which the first step was a functionalization of carbon nanotubes whereas the second one was the deposition of iron oxide. According the morphological and structural characterization, the carbon nanotubes with diameters of 10–40 nm were successfully covered by randomlydispersed magnetite nanoparticles with average diameter of 10 nm. Moreover, the thermogravimetric analysis results indicated that the mass ratio between carbon nanotubes and iron oxide nanoparticles was about 65–35%. The electrochemical performance of studied hybrid electrode was tested in 1M aqueous KCl electrolyte. The highest specific capacitance of 143 F g‒1 was recorded at a discharge current density of 1 A g‒1. The investigated nanomaterial also exhibited excellent cycling stability i.e. 81% retention of the initial capacitance after 3000 cycles.

Keywords:

Hybrid electrode, Magnetite, Multiwall carbon nanotube, Nanocomposite, Supercapacitor

Affiliations:
Krajewski M.-IPPT PAN
Liao P.Y.-Tatung University (TW)
Michalska M.-Łukasiewicz Research Network‒Institute of Electronic Materials Technology (PL)
Tokarczyk M.-University of Warsaw (PL)
Lin J.Y.-Tatung University (TW)
2.Krajewski M., Tokarczyk M., Stefaniuk T., Lewińska S., Ślawska-Waniewska A., Thermal Treatment of Chains of Amorphous Fe1–xCox Nanoparticles Made by Magnetic-Field-Induced Coreduction Reaction, IEEE Magnetics Letters, ISSN: 1949-307X, DOI: 10.1109/LMAG.2019.2950644, Vol.10, pp.6108405-1-5, 2019
Abstract:

The thermal treatment of chains composed of amorphous Fe 1–x Co x nanoparticles in two different oxygen atmospheres was studied. The nanostructures were manufactured using a magnetic-field-induced coreduction reaction, in which the precursor solutions containing 1:3 and 3:1 proportions of Fe 2+ and Co 2+ ions were reduced with sodium borohydride. The as-prepared nanochains were then heated for 30 min at 400 and 500 °C in dry air or argon containing about 1% oxygen. These processes led to their oxidation, and, as a result, the thermally treated Fe 1–x Co x nanochains were transformed into cobalt ferrite. Heating at 500 °C in the air-containing atmosphere caused the nanomaterials to lose their nanochain structures. In accordance to room-temperature magnetic measurements, the as-prepared and thermally treated Fe 1–x Co x nanochains were ferromagnetic. The highest saturation magnetization ( M S ) was measured for the Fe 1–x Co x nanochains treated at 400 °C in dry air (105 A·m 2 /kg and 154 A·m 2 /kg for Fe 0.25 Co 0.75 and Fe 0.75 Co 0.25 , respectively), whereas the lowest M S was found for the Fe 0.25 Co 0.75 heated at 500 °C in dry air (17 A·m 2 /kg) and the Fe 0.75 Co 0.25 heated at 500 °C in argon (16 A·m 2 /kg).

Keywords:

Nanomagnetics, FeCo nanochains, magnetic-field-induced synthesis, thermal treatment

Affiliations:
Krajewski M.-IPPT PAN
Tokarczyk M.-University of Warsaw (PL)
Stefaniuk T.-University of Warsaw (PL)
Lewińska S.-Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A.-other affiliation
3.Krajewski M., Brzozka K., Tokarczyk M., Kowalski G., Lewinska S., Slawska-Waniewska A., Lin W.S., Lin H.M., Impact of thermal oxidation on chemical composition and magnetic properties of iron nanoparticles, Journal of Magnetism and Magnetic Materials, ISSN: 0304-8853, DOI: 10.1016/j.jmmm.2018.03.047, Vol.458, pp.346-354, 2018
Abstract:

The main objective of this work is to study the influence of thermal oxidation on the chemical composition and magnetic properties of iron nanoparticles which were manufactured in a simple chemical reduction of Fe3+ ions coming from iron salt with sodium borohydride. The annealing processing was performed in an argon atmosphere containing the traces of oxygen to avoid spontaneous oxidation of iron at temperatures ranging from 200 °C to 800 °C. The chemical composition and magnetic properties of as-prepared and thermally-treated nanoparticles were determined by means of X-ray diffractometry, Raman spectroscopy, Mössbauer spectroscopy and vibrating sample magnetometry. Due to the magnetic interactions, the investigated iron nanoparticles tended to create the dense aggregates which were difficult to split even at low temperatures. This caused that there was no empty space between them, which led to their partial sintering at elevated temperatures. These features hindered their precise morphological observations using the electron microscopy techniques. The obtained results show that the annealing process up to 800 °C resulted in a progressive change in the chemical composition of as-prepared iron nanoparticles which was associated with their oxidation. As a consequence, their magnetic properties also depended on the annealing temperature. For instance, considering the values of saturation magnetization, its highest value was recorded for the as-prepared nanoparticles at 1 T and it equals 149 emu/g, while the saturation point for nanoparticles treated at 600 °C and higher temperatures was not reached even at the magnetic field of about 5 T. Moreover, a significant enhancement of coercivity was observed for the iron nanoparticles annealed over 600 °C.

Keywords:

Chemical composition, Chemical reduction, Iron nanoparticle, Magnetic properties, Oxidation

Affiliations:
Krajewski M.-IPPT PAN
Brzozka K.-University of Technology and Humanities in Radom (PL)
Tokarczyk M.-University of Warsaw (PL)
Kowalski G.-University of Warsaw (PL)
Lewinska S.-Institute of Physics, Polish Academy of Sciences (PL)
Slawska-Waniewska A.-Institute of Physics, Polish Academy of Sciences (PL)
Lin W.S.-Tatung University (TW)
Lin H.M.-Tatung University (TW)
4.Krajewski M., Lee P.H., Wu S.H., Brzózka K., Małolepszy A., Stobiński L., Tokarczyk M., Kowalski G., Wąsik D., Nanocomposite composed of multiwall carbon nanotubes covered by hematite nanoparticles as anode material for Li-ion batteries, Electrochimica Acta, ISSN: 0013-4686, DOI: 10.1016/j.electacta.2017.01.051, Vol.228, pp.82-90, 2017
Abstract:

This work describes the detailed studies performed on the nanocomposite composed of chemically-modified multiwall carbon nanotubes covered by hematite nanoparticles which diameters vary from 10 nm to 70 nm. This nanomaterial was fabricated in two-steps facile chemical synthesis and was characterized with the use of several experimental techniques, such as: thermogravimetric analysis, differential thermal analysis, Raman spectroscopy, X-ray diffraction, and transmission Mössbauer spectroscopy in order to determine its structure precisely. Moreover, the investigated nanocomposite was tested as an anode material of Li-ion batteries. Its cycling performance was stable during 40 cycles, while its capacity was retained at the level of 330 and 230 mAh/g at the discharge/charge rate of 25 and 200 mA/g, respectively.

Keywords:

anode material, hematite, Li-ion battery, multiwall carbon nanotube, nanocomposite

Affiliations:
Krajewski M.-IPPT PAN
Lee P.H.-Tatung University (TW)
Wu S.H.-Tatung University (TW)
Brzózka K.-University of Technology and Humanities in Radom (PL)
Małolepszy A.-Warsaw University of Technology (PL)
Stobiński L.-Warsaw University of Technology (PL)
Tokarczyk M.-University of Warsaw (PL)
Kowalski G.-University of Warsaw (PL)
Wąsik D.-other affiliation
5.Krajewski M., Brzózka K., Lin W.S., Lin H.M., Tokarczyk M., Borysiuk J., Kowalski G., Wasik D., High temperature oxidation of iron–iron oxide core–shell nanowires composed of iron nanoparticles, Physical Chemistry Chemical Physics, ISSN: 1463-9076, DOI: 10.1039/c5cp07569f, Vol.18, pp.3900-3909, 2016
Abstract:

This work describes an oxidation process of iron–iron oxide core–shell nanowires at temperatures between 100°C and 800°C. The studied nanomaterial was synthesized through a simple chemical reduction of iron trichloride in an external magnetic field under a constant flow of argon. The electron microscopy investigations allowed determining that the as-prepared nanowires were composed of self-assembled iron nanoparticles which were covered by a 3 nm thick oxide shell and separated from each other by a thin interface layer. Both these layers exhibited an amorphous or highly-disordered character which was traced by means of transmission electron microscopy and Mössbauer spectroscopy. The thermal oxidation was carried out under a constant flow of argon which contained the traces of oxygen. The first stage of process was related to slow transformations of amorphous Fe and amorphous iron oxides into crystalline phases and disappearance of interfaces between iron nanoparticles forming the studied nanomaterial (range: 25–300°C). After that, the crystalline iron core and iron oxide shell became oxidized and signals for different compositions of iron oxide sheath were observed (range: 300–800°C) using X-ray diffraction, Raman spectroscopy and Mössbauer spectroscopy. According to the thermal gravimetric analysis, the nanowires heated up to 800°C under argon atmosphere gained 37% of mass with respect to their initial weight. The structure of the studied nanomaterial oxidized at 800°C was mainly composed of α-Fe2O3 (∼93%). Moreover, iron nanowires treated above 600°C lost their wire-like shape due to their shrinkage and collapse caused by the void coalescence.

Keywords:

annealing, core-shell nanostructure, iron nanoparticles, iron nanowires, oxidation, thermal treatment

Affiliations:
Krajewski M.-other affiliation
Brzózka K.-University of Technology and Humanities in Radom (PL)
Lin W.S.-Tatung University (TW)
Lin H.M.-Tatung University (TW)
Tokarczyk M.-University of Warsaw (PL)
Borysiuk J.-University of Warsaw (PL)
Kowalski G.-University of Warsaw (PL)
Wasik D.-University of Warsaw (PL)
6.Krajewski M., Lin W.S., Lin H.M., Tokarczyk M., Lewińska S., Nedelko N., Ślawska-Waniewska A., Kowalski G., Borysiuk J., Wasik D., High temperature annealing of iron nanowires, PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, ISSN: 1862-6300, DOI: 10.1002/pssa.201431843, Vol.212, No.4, pp.862-866, 2015
Abstract:

This work presents the results of high temperature annealing of iron nanowires at five different temperatures (ranging 200–800 °C) in the slightly oxidative atmosphere. Investigated nanomaterial was prepared in simple chemical reduction process from aqueous solution of iron trichloride placed in external magnetic field. Experimental results allowed determining how magnetic properties of as-prepared as well as annealed iron nanowires change in respect to their structures. They also delivered information about phase transitions occurred in as-prepared sample under thermal treatment.

Keywords:

annealing, iron, magnetic properties, nanowires

Affiliations:
Krajewski M.-other affiliation
Lin W.S.-Tatung University (TW)
Lin H.M.-Tatung University (TW)
Tokarczyk M.-University of Warsaw (PL)
Lewińska S.-Institute of Physics, Polish Academy of Sciences (PL)
Nedelko N.-Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A.-other affiliation
Kowalski G.-University of Warsaw (PL)
Borysiuk J.-University of Warsaw (PL)
Wasik D.-University of Warsaw (PL)
7.Krajewski M., Małolepszy A., Stobiński L., Lewińska S., Ślawska-Waniewska A., Tokarczyk M., Kowalski G., Borysiuk J., Wasik D., Preparation and Characterization of Hematite-Multiwall Carbon Nanotubes Nanocomposite, Journal of Superconductivity and Novel Magnetism, ISSN: 1557-1939, DOI: 10.1007/s10948-014-2794-7, Vol.28, No.3, pp.901-904, 2015
Abstract:

The aim of this work is to study the preparation and characterization of a new nanocomposite which consists of chemically-modified multiwall carbon nanotubes covered by randomly-deposited nanoparticles of hematite. The morphology, structural and physical properties of the investigated nanomaterial were determined by means of transmission electron microscopy, X-ray diffraction and vibrating sample magnetometry at ambient conditions. The presence of residual catalyst nanospheres inside multiwall carbon nanotubes was confirmed by transmission electron microscopy. The signal coming from this contamination was under the detection limit of X-ray diffractometer, therefore it was not registered.

Keywords:

Hematite, Multiwall carbon nanotubes, CVD, TEM, XRD, VSM

Affiliations:
Krajewski M.-other affiliation
Małolepszy A.-Warsaw University of Technology (PL)
Stobiński L.-Warsaw University of Technology (PL)
Lewińska S.-Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A.-other affiliation
Tokarczyk M.-University of Warsaw (PL)
Kowalski G.-University of Warsaw (PL)
Borysiuk J.-University of Warsaw (PL)
Wasik D.-University of Warsaw (PL)

Conference papers
1.Krajewski M., Tokarczyk M., Witecka A., Lewińska S., Ślawska-Waniewska A., Małolepszy A., Liou S.C., Chiou W.A., Manufacturing and magnetic properties of FexCo1‒x wire-like nanoalloys, CNM 2019, 6th CONFERENCE ON NANO- AND MICROMECHANICS, 2019-07-03/07-05, Rzeszów (PL), pp.103-104, 2019
Keywords:

magnetic-field-induced process, magnetic material, nanoalloy, wire-like nanostructure

Affiliations:
Krajewski M.-IPPT PAN
Tokarczyk M.-University of Warsaw (PL)
Witecka A.-IPPT PAN
Lewińska S.-Institute of Physics, Polish Academy of Sciences (PL)
Ślawska-Waniewska A.-other affiliation
Małolepszy A.-Warsaw University of Technology (PL)
Liou S.C.-University of Maryland (US)
Chiou W.A.-University of Maryland (US)
2.Liou S.C., Krajewski M., Chiou W.A., Tokarczyk M., Kowalski G., TEM Studies of Fe1-xNix Nanowires by Magnetic-Field-Induced Synthesis, M&M 2019, Microscopy & Microanalysis 2019, 2019-08-04/08-08, Portland (US), DOI: 10.1017/S143192761901170X, No.25, pp.2194-2195, 2019

Conference abstracts
1.Krajewski M., Tokarczyk M., Stefaniuk T., Kowalski G., Lewińska S., Ślawska-Waniewska A., High temperature treatment of nanochains composed of Fe1‒xCox nanoparticles, IBCM 2019, III International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials, 2019-08-18/08-22, Svetlogorsk (RU), pp.52-52, 2019
2.Krajewski M., Tokarczyk M., Witecka A., Lewińska S., Ślawska-Waniewska A., Liou S.C., Chiou W.A., Płocińska M., Towards magnetic 1D nanostructures - magnetic field as a growth parameter, LIV Zakopane School of Physics Breaking Frontiers: Submicron Structures in Physics and Biology, 2019-05-21/05-25, Zakopane (PL), pp.42-42, 2019
3.Krajewski M., Tokarczyk M., Kowalski G., Witecka A., Magnetic-field-induced synthesis of bimetallic wire-like nanostructures, NANOSMAT, 13th International Conference on Surfaces, Coatings and Nanostructured Materials, 2018-09-11/09-14, Gdańsk (PL), No.107, pp.55-56, 2018