Título:	Green exfoliation of van der Waals–based magnetic nanocomposites for hyperthermia applications
Autor(es):	Caland, Juliani Penha Silva, Atailson Oliveira da Marroquin, John Fredy Ricardo Sousa, Marcelo Henrique Archanjo, Bráulio Soares Karagiannidis, Panagiotis G. Felix, Jorlandio Francisco
ORCID:	https://orcid.org/0000-0003-2740-4286 https://orcid.org/0000-0001-7434-6491 https://orcid.org/0000-0002-1969-452X https://orcid.org/0000-0003-1210-8329 https://orcid.org/0000-0001-8145-7712 https://orcid.org/0000-0002-2709-4161 https://orcid.org/0000-0003-0986-1854
Afiliação do autor:	University of Brasília, Institute of Physics, Laboratory of Interfaces and Nanodevices in Semiconductors University of Brasília, Green Nanotechnology Group University of Brasília, Institute of Physics, Laboratory of Interfaces and Nanodevices in Semiconductors University of Brasília, Green Nanotechnology Group National Institute of Metrology, Quality and Technology, Materials Metrology Division University of Sunderland, Faculty of Business and Technology, School of Computer Science and Engineering University of Brasília, Institute of Physics, Laboratory of Interfaces and Nanodevices in Semiconductors
Assunto:	Nanocompósitos magnéticos Magnetohipertermia Dicalcogenetos de metais de transição Grafeno Materiais Van der Waals (vdW) Nanopartículas de maghemita
Data de publicação:	5-jun-2025
Editora:	Elsevier
Referência:	CALAND, Juliani Penha et al. Green exfoliation of van der Waals–based magnetic nanocomposites for hyperthermia applications. Materials & Design, v. 255, e114176, 2025. DOI: https://doi.org/10.1016/j.matdes.2025.114176. Disponível em: https://www.sciencedirect.com/science/article/pii/S0264127525005969?via%3Dihub. Acesso em: 25 nov. 2025.
Abstract:	We present the development of novel nanocomposites consisting of van der Waals (vdW) materials (WS2, MoS2, MoSe2, TiS2, and graphene), maghemite nanoparticles (MNPs), and a gum arabic (GA) matrix, optimized for magnetic hyperthermia applications. These superparamagnetic nanocomposites were comprehensively investigated using a range of advanced characterization techniques. It was found that the incorporation of MNPs enhances the exfoliation efficiency of vdW materials. Transmission electron microscopy revealed that the MNPs, with an average diameter of 〈DTEM〉 = 8.3 ± 0.1 nm, are nearly spherical and uniformly anchored on the surfaces of the vdW material flakes. Raman spectroscopy confirmed the presence of characteristic 2D material signatures and verified the formation of magnetic nanocomposites with varying layer numbers. Zeta potential measurements indicated high colloidal stability, which is essential for biomedical applications. Magnetic measurements confirmed the superparamagnetic nature of the vdW-integrated nanocomposites, showing reduced saturation magnetization, increased coercivity, and a shifted blocking temperature due to dipole–dipole interactions influenced by the presence of vdW materials. The highest specific absorption rate (SAR) values recorded were 21.4 W/g for Graphene@GA@MNPs, 20.6 W/g for WS2@GA@MNPs, and 23.3 W/g for TiS2@GA@MNPs. Magnetic hyperthermia tests demonstrated efficient heat generation under alternating magnetic fields, reinforcing their potential for biomedical applications.
Unidade Acadêmica:	Instituto de Física (IF) Instituto de Ciências Biológicas (IB) Departamento de Genética e Morfologia (IB GEM)
Programa de pós-graduação:	Programa de Pós-Graduação em Física Programa de Pós-Graduação em Nanociência e Nanobiotecnologia
Licença:	This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
DOI:	https://doi.org/10.1016/j.matdes.2025.114176
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