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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

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

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

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

Name of the periodical

MOLECULES

ISSN

1420-3049

e-ISSN

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Volume of the periodical

28

Issue of the periodical within the volume

15

Country of publishing house

CH - SWITZERLAND

Number of pages

12

Pages from-to

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UT code for WoS article

001046792900001

EID of the result in the Scopus database

2-s2.0-85167740310