Tuning the shape, size, phase composition and stoichiometry of iron oxide nanoparticles: The role of phosphate anions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F21%3A73607341" target="_blank" >RIV/61989592:15640/21:73607341 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0925838820333041?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925838820333041?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jallcom.2020.156940" target="_blank" >10.1016/j.jallcom.2020.156940</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tuning the shape, size, phase composition and stoichiometry of iron oxide nanoparticles: The role of phosphate anions

Popis výsledku v původním jazyce

This work describes a microwave synthetic approach for the controlled assembly of alpha-Fe2O3 nanosystems with defined morphologies, such as hollow nanotubes (NTs), solid nanorods (NRs) and nanodisks (NDs). The morphological control is aided during the crystallization processes by using phosphate anions as key surfactants in solution. Furthermore, the thermal reduction under H-2 atmosphere of these NTs, NRs and NDs alpha-Fe2O3 systems to the correspondent Fe3O4 nanomaterials preserved their initial morphologies. It was observed that the concentration of phosphate anions and volume of solvent had significant impact not only on controlling the shapes and sizes, but also phase composition and stoichiometry of the NTs, NRs and NDs nanoparticles. X-ray Rietveld refinement analysis of the NTs, NRs and NDs systems, after reduction in H-2, revealed the presence of zero-valent iron (Fe-0) in the final materials, with Fe-0 fractions that decreased gradually in % from NTs (similar to 16%), NRs (similar to 11%) to NDs (similar to 0%) upon increasing amount of phosphate anions. Bulk magnetic susceptibility measurements showed clear alterations of the Verwey transition temperatures (T-V) and the development of unusual magnetic phenomena, such as magnetic vortex states in NDs, which was subsequently verified by micro-magnetic simulations. From the combination of XRD analysis, bulk magnetic susceptibility and M_ossbauer results, we provide herein a detailed mechanistic description of the chemical processes that gated the development of shape-controlled synthesis of NTs, NRs and NDs and give a detailed correlation between specific morphology and magneto-electronic behaviors. (C) 2020 Elsevier B.V. All rights reserved.

Název v anglickém jazyce

Tuning the shape, size, phase composition and stoichiometry of iron oxide nanoparticles: The role of phosphate anions

Popis výsledku anglicky

This work describes a microwave synthetic approach for the controlled assembly of alpha-Fe2O3 nanosystems with defined morphologies, such as hollow nanotubes (NTs), solid nanorods (NRs) and nanodisks (NDs). The morphological control is aided during the crystallization processes by using phosphate anions as key surfactants in solution. Furthermore, the thermal reduction under H-2 atmosphere of these NTs, NRs and NDs alpha-Fe2O3 systems to the correspondent Fe3O4 nanomaterials preserved their initial morphologies. It was observed that the concentration of phosphate anions and volume of solvent had significant impact not only on controlling the shapes and sizes, but also phase composition and stoichiometry of the NTs, NRs and NDs nanoparticles. X-ray Rietveld refinement analysis of the NTs, NRs and NDs systems, after reduction in H-2, revealed the presence of zero-valent iron (Fe-0) in the final materials, with Fe-0 fractions that decreased gradually in % from NTs (similar to 16%), NRs (similar to 11%) to NDs (similar to 0%) upon increasing amount of phosphate anions. Bulk magnetic susceptibility measurements showed clear alterations of the Verwey transition temperatures (T-V) and the development of unusual magnetic phenomena, such as magnetic vortex states in NDs, which was subsequently verified by micro-magnetic simulations. From the combination of XRD analysis, bulk magnetic susceptibility and M_ossbauer results, we provide herein a detailed mechanistic description of the chemical processes that gated the development of shape-controlled synthesis of NTs, NRs and NDs and give a detailed correlation between specific morphology and magneto-electronic behaviors. (C) 2020 Elsevier B.V. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF ALLOYS AND COMPOUNDS

ISSN

0925-8388

e-ISSN

—

Svazek periodika

2021

Číslo periodika v rámci svazku

856

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000627309500008

EID výsledku v databázi Scopus

2-s2.0-85097667982