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The development of electronics with net zero carbon emissions through more efficient and environmentally friendly materials and processes is still a challenge. Here, alternative chemical synthesis routes of metal conductive nanoparticles, based on biodegradable materials are explored, such as nickel, iron–nickel alloy and iron nanoparticles, to be used, in the long term, as fillers in inks for inject printing. Thus, Ni and FeNi metal nanoparticles of 25–12 nm, forming aggregates of 614–574 nm, respectively, are synthesized in water in the presence of a polyol and a reducing agent and under microwave heating that enables a more uniform and fast heating. Iron nanoparticles of 120 ± 40 nm are synthesized in polyol that limits the aggregation and the oxidation degree. Commercial metal nanoparticles of iron and nickel, are coated with ethylene glycol and used for comparison. The conductivity of nanoparticles when pressed into pellets remains similar for both commercial and synthesized samples. However, when deposited on a strip line and heated, synthesized Ni, FeNi, and Fe nanoparticles show significant conductivity and interesting magnetic properties. It is demonstrated that the nanosize facilitates sintering at reduced temperatures and the capping agents prevent oxidation, resulting in promising conductive fillers for printed electronic applications., B.C.P. and C.D.U. contributed equally to this work. This research wasfunded by the Spanish Ministry of Science, grant number PID2020-13480RB-I00 and TED2021-130191B-C43, and by the EU-commission,HORIZON-CL4-2021-DIGITAL-EMERGING-01 (HyPELignum), PROJECTNo.101070302 (2022-26). M.S. was supported by a Margarita Salas fel-lowship financed by the European Union-NextGenerationEU and thePlan for Recovery, Transformation and Resilience. Authors also acknowl-edge the Servicio Interdepartamental de Investigación at the Universi-dad Autónoma de Madrid, the TEM Service at the Centro de BiologíaMolecular Severo Ochoa (CBMSO, CSIC-UAM), SEM at MiNa Labora-tory (IMN, funding from CM (project S2018/NMT-4291 TEC2SPACE),MINECO (project CSIC13-4E-1794) and EU (FEDER, FSE)) and XRD, FTIR,the elemental and thermal analysis, and the characterization and growthof thin films service at ICMM/CSIC.

© 2021 by the authors. Licensee MDPI Artículo firmado por más de diez autores. This work was supported by the NoCanTher project, which has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 685795. The authors acknowledge support from the COST Association through the COST actions “RADIOMAG” (TD1402) and “MyWAVE” (CA17115). D.O., A.S.-O. and I.R.-R. acknowledge financial support from the Community of Madrid under Contracts No. PEJD-2017-PRE/IND-3663 and PEJ-2018-AI/IND-11069, from the Spanish Ministry of Science through the Ramón y Cajal grant Materials 2021, 14, 706 27 of 36 RYC2018-025253-I and Research Networks RED2018-102626-T, as well as the Ministry of Economy and Competitiveness through the grants MAT2017-85617-R, MAT2017-88148R and the “Severo Ochoa” Program for Centers of Excellence in R&D (SEV-2016-0686). M.B. and N.T.K.T. would liketo thank EPSRC for funding (grant EP/K038656/1 and EP/M015157/1) and AOARD (FA2386-17-1-4042) award. This work was additionally supported by the EMPIR program co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation program, grant no. 16NRM04 “MagNaStand”. The work was further supported by the DFG grant CRC “Matrix in Vision” (SFB 1340/1 2018, no 372486779, project A02)., The scientific community has made great efforts in advancing magnetic hyperthermia for the last two decades after going through a sizeable research lapse from its establishment. All the progress made in various topics ranging from nanoparticle synthesis to biocompatibilization and in vivo testing have been seeking to push the forefront towards some new clinical trials. As many, they did not go at the expected pace. Today, fruitful international cooperation and the wisdom gain after a careful analysis of the lessons learned from seminal clinical trials allow us to have a future with better guarantees for a more definitive takeoff of this genuine nanotherapy against cancer. Deliberately giving prominence to a number of critical aspects, this opinion review offers a blend of state-of-the-art hints and glimpses into the future of the therapy, considering the expected evolution of science and technology behind magnetic hyperthermia., Unión Europea. H2020, Ministerio de Economía y Competitividad (MINECO)/ FEDER, Ministerio de Ciencia e Innovación (MICINN), Comunidad de Madrid, Deutsche Forschungsgemeinschaft (DFG), Centros de Excelencia Severo Ochoa (MICINN), Programa Ramón y Cajal, Depto. de Física de Materiales, Fac. de Ciencias Físicas, TRUE, pub

The scientific community has made great efforts in advancing magnetic hyperthermia for the last two decades after going through a sizeable research lapse from its establishment. All the progress made in various topics ranging from nanoparticle synthesis to biocompatibilization and in vivo testing have been seeking to push the forefront towards some new clinical trials. As many, they did not go at the expected pace. Today, fruitful international cooperation and the wisdom gain after a careful analysis of the lessons learned from seminal clinical trials allow us to have a future with better guarantees for a more definitive takeoff of this genuine nanotherapy against cancer. Deliberately giving prominence to a number of critical aspects, this opinion review offers a blend of state-of-the-art hints and glimpses into the future of the therapy, considering the expected evolution of science and technology behind magnetic hyperthermia.