FisMat2017 - Submission - View

Abstract's title: Physical synthesis of metal@oxide, core@shell nanoparticles: two case studies
Submitting author: Sergio D'Addato
Affiliation: CNR-NANO and Dipartimento FIM, Enetech, Università di Modena e Reggio Emilia
Affiliation Address: via G. Campi 213/a 41125 Modena
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Maria Chiara Spadaro (CNR-NANO and Dipartimento FIM, EneTech, Università di Modena e Reggio Emilia), Paola Luches (CNR-NANO),Sergio Valeri (CNR-NANO and Dipartimento FIM, Università di Modena e Reggio Emilia),Jacopo Stefano Pelli Cresi (CNR-NANO and Dipartimento FIM, Università di Modena e Reggio Emilia), Alessandro Ponti (CNR-ISTM),Anna Maria Ferretti (CNR-ISTM), Vincenzo Grillo (CNR-NANO), Giovanni Bertoni (CNR-IMEM), Luca Pasquali (DIEF,Università di Modena e Reggio Emilia)
Abstract

Synthesis, study and applications of NanoParticles (NPs) have been playing a major role in material science and technology over the last 20 years, although some important examples of NP presence in manufactured goods can be dated back to ancient history [1]. Realization of NPs with chemical methods is nowadays mainstream, because of the cost effectiveness and scalability. Nevertheless, physical synthesis with a bottom-up approach presents some advantages, especially when a “fine tuning” of the NP properties is required. Physical synthesis can be single-step and ligand-free, and these characteristics can result in a more accurate analysis of the NP structure and of their electronic and magnetic behavior. During the last years we developed a laboratory for the NP synthesis with a magnetron based gas aggregation source (GAS) and a quadrupole mass filter. The versatility of the NP source allowed us to prepare and study different types of NPs. Moreover, co-deposition and sequential layer deposition methods have been used to obtain core@shell NPs. These methods gave us the possibility of realizing non-native oxide shells [2], and to investigate metal@metal oxide core@shell NPs by varying independently the core diameter and the shell thickness. Two case studies will be reported:

·      An investigation of structure and magnetic properties of Ni@NiO and Ni@CoO NP films, as model systems for exploiting the exchange bias effect to “beat the superparamagnetic limit” [3,4].

·      An experimental and study of structure and plasmonic properties of Ag, Ag@MgO and Ag@CaF2 NP films, of potential interest in photovoltaic [5,6].

 

[1] D.J. Barber and I. C. Freeston, Archaeometry 32 (1990) 33.

[2] S. D’Addato et al., J. Phys. Chem C 115 (2011) 14044.

[3] J. A. De Toro et al., Phys. Rev. Lett. 115(2015) 057201.

[4] M. C. Spadaro et al., Nanotechnology 26 (2015) 405704.

[5] H. A. Atwater and A. Polman, Nature Mat. 9 (2010) 205

[6] S. D’Addato et al., Beilstein J. Nanotechnol. 6 (2015) 404.