Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-Amino-1,2,4-Triazole Spin Crossover Nanopar

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F23%3A73620632" target="_blank" >RIV/61989592:15640/23:73620632 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/1420-3049/28/15/5816" target="_blank" >https://www.mdpi.com/1420-3049/28/15/5816</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/molecules28155816" target="_blank" >10.3390/molecules28155816</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-Amino-1,2,4-Triazole Spin Crossover Nanopar

Popis výsledku v původním jazyce

A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe(NH(2)trz)(3)](Br-2). By introducing different quantities of 0.5% and 1.0% of GO (according to iron(II)) into the aqueous phase, two hybrids, NP4 and NP5, were synthesized, respectively. The morphological homogeneity of the NPs on the surface of the GO flakes is greatly improved in comparison to the pristine [Fe(NH(2)trz)(3)](Br-2) NPs. From the magnetic point of view and at a low magnetic sweep rate of 1 K/min, a two-step hysteretic behavior is observed for NP4 and NP5, where the onset of the low-temperature second step appeared at 40% and 30% of the HS fraction, respectively. For faster sweep rates of 5-10 K/min, the two steps from the cooling branch are progressively smeared out, and the critical temperatures observed are T-1/ 2 up arrow = 343 K and T-1/ 2 down arrow = 288 K, with a thermal width of 55 K for both NP4 and NP5. A Raman laser power-assisted protocol was used to monitor the thermal tolerance of the hybrids, while XPS analysis revealed electronic interactions between the SCO NPs and the GO flakes.

Název v anglickém jazyce

Observation of Two-Step Spin Transition in Graphene Oxide-Based Hybrids with Iron(II) 4-Amino-1,2,4-Triazole Spin Crossover Nanopar

Popis výsledku anglicky

A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula [Fe(NH(2)trz)(3)](Br-2). By introducing different quantities of 0.5% and 1.0% of GO (according to iron(II)) into the aqueous phase, two hybrids, NP4 and NP5, were synthesized, respectively. The morphological homogeneity of the NPs on the surface of the GO flakes is greatly improved in comparison to the pristine [Fe(NH(2)trz)(3)](Br-2) NPs. From the magnetic point of view and at a low magnetic sweep rate of 1 K/min, a two-step hysteretic behavior is observed for NP4 and NP5, where the onset of the low-temperature second step appeared at 40% and 30% of the HS fraction, respectively. For faster sweep rates of 5-10 K/min, the two steps from the cooling branch are progressively smeared out, and the critical temperatures observed are T-1/ 2 up arrow = 343 K and T-1/ 2 down arrow = 288 K, with a thermal width of 55 K for both NP4 and NP5. A Raman laser power-assisted protocol was used to monitor the thermal tolerance of the hybrids, while XPS analysis revealed electronic interactions between the SCO NPs and the GO flakes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21002 - Nano-processes (applications on nano-scale); (biomaterials to be 2.9)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

MOLECULES

ISSN

1420-3049

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

001046792900001

EID výsledku v databázi Scopus

2-s2.0-85167740310