Dynamics of ternary $Cu–Fe–S_2$ nanoparticles stabilized by organic ligands
PBN-AR
Instytucja
Akademickie Centrum Materiałów i Nanotechnologii (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Journal of Physical Chemistry. C (35pkt w roku publikacji)
ISSN
1932-7447
EISSN
1932-7455
Wydawca
American Chemical Society
DOI
Rok publikacji
2017
Numer zeszytu
12
Strony od-do
6977--6985
Numer tomu
121
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.64
Autorzy
(liczba autorów: 8)
Pozostali autorzy
+ 7
Streszczenia
Język
EN
Treść
Chalcopyrite-type (Cu-Fe-S-2) ternary nano crystals stabilized by long aliphatic chain ligands could be considered as isolated hard nanoobjects dispersed in a soft network of organic ligands. The main attention was paid to the behavior of the particles whose average size was varied in a controllable manner from 3 to 20 nm. Dynamics of the nanoparticles was studied by applying Mossbauer spectroscopy. The fast dynamics could be described by a two-level environment. The deeper level : (atomic) was practically the same as for bulk material except for the Debye temperature, but the higher level (particle motion) was described by the classical harmonic oscillator with the spring constant dramatically softening with increasing temperature. Such behavior led to a fast decrease of the fraction detectable by Mossbauer spectroscopy with increasing temperature. The induced internal oscillations within a particle by the surrounding thermal bath additionally contribute to the shift of measured spectra. Slow dynamics was characterized by the thermally driven overdamped harmonic oscillator motions. In addition, the long-range-like diffusion of particles was seen. No significant rotation of particles was found within the accessible temperature range.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:111825
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