000135811 001__ 135811
000135811 005__ 20260217205447.0
000135811 0247_ $$2doi$$a10.1038/s41598-024-54892-2
000135811 0248_ $$2sideral$$a138835
000135811 037__ $$aART-2024-138835
000135811 041__ $$aeng
000135811 100__ $$aBaricic, Miran
000135811 245__ $$aAdvancements in polyol synthesis: expanding chemical horizons and Néel temperature tuning of CoO nanoparticles
000135811 260__ $$c2024
000135811 5060_ $$aAccess copy available to the general public$$fUnrestricted
000135811 5203_ $$aThe polyol synthesis of CoO nanoparticles (NPs) is typically conducted by dissolving and heating cobalt acetate tetrahydrate and water in diethylene glycol (DEG). This process yields aggregates of approximately 100 nm made of partially aligned primary crystals. However, the synthesis demands careful temperature control to allow the nucleation of CoO while simultaneously preventing reduction, caused by the activity of DEG. This restriction hinders the flexibility to freely adjust synthesis conditions, impeding the ability to obtain particles with varied morpho-structural properties, which, in turn, directly impact chemical and physical attributes. In this context, the growth of CoO NPs in polyol was studied focusing on the effect of the polyol chain length and the synthesis temperature at two different water/cations ratios. During this investigation, we found that longer polyol chains remove the previous limits of the method, allowing the tuning of aggregate size (20–150 nm), shape (spherical-octahedral), and crystalline length (8–35 nm). Regarding the characterization, our focus revolved around investigating the magnetic properties inherent in the synthesized products. From this point of view, two pivotal findings emerged. Firstly, we identified small quantities of a layered hydroxide ferromagnetic intermediate, which acted as interference in our measurements. This intermediate exhibited magnetic properties consistent with features observed in other publications on CoO produced in systems compatible with the intermediate formation. Optimal synthetic conditions that prevent the impurity from forming were found. This resolution clarifies several ambiguities existing in literature about CoO low-temperature magnetic behavior. Secondly, a regular relationship of the NPs' TN with their crystallite size was found, allowing us to regulate TN over ~ 80 K. For the first time, a branching was found in this structure-dependent magnetic feature, with samples of spheroidal morphology consistently having lower magnetic temperatures, when compared to samples with faceted/octahedral shape, providing compelling evidence for a novel physical parameter influencing the TN of a material. These two findings contribute to the understanding of the fundamental properties of CoO and antiferromagnetic materials.
000135811 536__ $$9info:eu-repo/grantAgreement/EC/H2020/101007825/EU/ULtra ThIn MAgneto Thermal sEnsor-Ing/ULTIMATE-I$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 101007825-ULTIMATE-I$$9info:eu-repo/grantAgreement/EC/H2020/872631 /EU/Memristive and multiferroic materials for emergent logic units in nanoelectronics/MELON$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 872631 -MELON
000135811 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000135811 590__ $$a3.9$$b2024
000135811 592__ $$a0.874$$b2024
000135811 591__ $$aMULTIDISCIPLINARY SCIENCES$$b25 / 136 = 0.184$$c2024$$dQ1$$eT1
000135811 593__ $$aMultidisciplinary$$c2024$$dQ1
000135811 594__ $$a6.7$$b2024
000135811 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000135811 700__ $$aNuñez, Jorge M.
000135811 700__ $$0(orcid)0000-0002-1296-4793$$aAguirre, Myriam H.$$uUniversidad de Zaragoza
000135811 700__ $$aHrabovsky, David
000135811 700__ $$aSeydou, Mahamadou
000135811 700__ $$aMeneghini, Carlo
000135811 700__ $$aPeddis, Davide
000135811 700__ $$aAmmar, Souad
000135811 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000135811 773__ $$g14, 1 (2024), 12 pp.$$pSci. rep. (Nat. Publ. Group)$$tScientific reports (Nature Publishing Group)$$x2045-2322
000135811 8564_ $$s5308745$$uhttps://zaguan.unizar.es/record/135811/files/texto_completo.pdf$$yVersión publicada
000135811 8564_ $$s2603524$$uhttps://zaguan.unizar.es/record/135811/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000135811 909CO $$ooai:zaguan.unizar.es:135811$$particulos$$pdriver
000135811 951__ $$a2026-02-17-20:18:06
000135811 980__ $$aARTICLE