Partner: Ł. Kłopotowski


Ostatnie publikacje
1.Wojnar P., Zieliński M., Janik E., Zaleszczyk W., Wojciechowski T., Wojnar R., Szymura M., Kłopotowski Ł., Baczewski L.T., Pietruchik A., Wiater M., Kret S., Karczewski G., Wojtowicz T., Kossut J., Strain-induced energy gap variation in ZnTe/ZnMgTe core/shell nanowires, APPLIED PHYSICS LETTERS, ISSN: 0003-6951, DOI: 10.1063/1.4873355, Vol.104, pp.163111-1-5, 2014

Streszczenie:

Strain-induced changes of ZnTe energy gap in ZnTe/ZnMgTe core/shell nanowires arising from lattice mismatch between the core and the shell semiconductor are studied by means of optical methods. It is shown that the increase of the Mg content in the shell, as well as the increase of the shell thickness result in an effective redshift of the near band edge photoluminescence from ZnTe nanowire cores, which reflects directly the decrease of energy gap under tensile strain conditions. The conclusions are supported by theoretical calculations in terms of the valence force field model. The observed change of ZnTe energy gap can be as large as 120 meV with respect to the unstrained conditions and can be tuned in a continuous manner by adjusting shell parameters, which open a path towards an effective band gap engineering in these structures.

Słowa kluczowe:

Nanowires, II-VI semiconductors, Magnesium, Band gap, Quantum effects

Afiliacje autorów:

Wojnar P.-Institute of Physics, Polish Academy of Sciences (PL)
Zieliński M.-other affiliation
Wiater M.-Institute of Physics, Polish Academy of Sciences (PL)
Kret S.-Institute of Physics, Polish Academy of Sciences (PL)
Karczewski G.-other affiliation
Wojtowicz T.-Institute of Physics, Polish Academy of Sciences (PL)
Kossut J.-Institute of Physics, Polish Academy of Sciences (PL)
Janik E.-other affiliation
Zaleszczyk W.-other affiliation
Wojciechowski T.-Institute of Physics, Polish Academy of Sciences (PL)
Wojnar R.-IPPT PAN
Szymura M.-other affiliation
Kłopotowski Ł.-other affiliation
Baczewski L.T.-Institute of Physics, Polish Academy of Sciences (PL)
Pietruchik A.-Institute of Physics, Polish Academy of Sciences (PL)
40p.
2.Baranowska-Korczyc A., Reszka A., Sobczak K., Sikora B., Dziawa P., Aleszkiewicz M., Kłopotowski Ł., Paszkowicz W., Dłużewski P., Kowalski B.J., Kowalewski T.A., Sawicki M., Elbaum D., Fronc K., Magnetic Fe doped ZnO nanofibers obtained by electrospinning, JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, ISSN: 0928-0707, DOI: 10.1007/s10971-011-2650-1, Vol.61, No.3, pp.494-500, 2012

Streszczenie:

Comprehensive studies of drug transport in nanofibres based mats have been performed to predict drug release kinetics. The paper presents our approach to analyze the impact of fibers arrangement, one of the parameters varied in our parallel experimental studies. Drug encapsulation in submicron fibers and subsequent controlled release of drugs is a tedious task due to the large number of process and material parameters involved. In the numerical study we constructed a 3D finite element geometry representing nanofibrous cubic element. COMSOL Multiphysics has been used to assess the impact of the various purposed arrangements of fibers within the mat. Drug release from nanofibers was modeled by adsorption -desorption and diffusion equation, where drug diffusion coefficient in the fluid between the fibers was altered depending on porosity of the material. Our study shows that for the same material porosity drug release from the matrix of regularly oriented fibers is slower than from randomly oriented, isotropic nanofibrous material. Also by decreasing distance between the fibers drug transport rate is reduced.

Słowa kluczowe:

Electrospinning, ZnO nanofibers, ZnFeO, Room temperature ferromagnetism, Magnetic oxides

Afiliacje autorów:

Baranowska-Korczyc A.-other affiliation
Reszka A.-other affiliation
Kowalewski T.A.-IPPT PAN
Sawicki M.-other affiliation
Elbaum D.-other affiliation
Fronc K.-other affiliation
Sobczak K.-other affiliation
Sikora B.-other affiliation
Dziawa P.-other affiliation
Aleszkiewicz M.-other affiliation
Kłopotowski Ł.-other affiliation
Paszkowicz W.-other affiliation
Dłużewski P.-other affiliation
Kowalski B.J.-other affiliation
35p.