Giulio Campo
University of Florence
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Publication
Featured researches published by Giulio Campo.
Journal of the American Chemical Society | 2013
Tamyris T. da Cunha; Julie Jung; Marie Emmanuelle Boulon; Giulio Campo; Fabrice Pointillart; Cynthia L. M. Pereira; Boris Le Guennic; Olivier Cador; Kevin Bernot; Francesco Pineider; Stéphane Golhen; Lahcène Ouahab
The [Dy(tta)3(L)] complex behaves as a single ion magnet both in its crystalline phase and in solution. Experimental and theoretical magnetic anisotropy axes perfectly match and lie along the most electro-negative atoms of the coordination sphere. Both VSM and MCD measurements highlight the robustness of the complex, with persistence of the memory effect even in solution up to 4 K.
Nano Letters | 2013
Francesco Pineider; Giulio Campo; Valentina Bonanni; César de Julián Fernández; Giovanni Mattei; Andrea Caneschi; Dante Gatteschi; Claudio Sangregorio
The quest for efficient ways of modulating localized surface plasmon resonance is one of the frontiers in current research in plasmonics; the use of a magnetic field as a source of modulation is among the most promising candidates for active plasmonics. Here we report the observation of magnetoplasmonic modes on colloidal gold nanoparticles detected by means of magnetic circular dichroism (MCD) spectroscopy and provide a model that is able to rationalize and reproduce the experiment with unprecedented qualitative and quantitative accuracy. We believe that the steep slope observed at the plasmon resonance in the MCD spectrum can be very efficient in detecting changes in the refractive index of the surrounding medium, and we give a simple proof of principle of its possible implementation for magnetoplasmonic refractometric sensing.
Journal of Materials Chemistry C | 2013
Luigi Malavolti; Matteo Mannini; Pierre-Emmanuel Car; Giulio Campo; Francesco Pineider; Roberta Sessoli
Terbium(III) bis-phthalocyaninato neutral complex, a robust and evaporable Single Molecule Magnet (SMM) with a record height of the anisotropy barrier, has recently attracted a great interest as an active unit in single molecule electronics, but at the same time its magnetic hysteresis has been found to be strongly affected when the environment is different from the crystalline phase. Here we present a systematic investigation of the magnetization dynamics in different environments, obtained by magnetic dilution, thermal treatment and sublimation of the molecules, to shed some light on the origin of the evanescence of the hysteretic behavior of this unique SMM.
Nano Research | 2015
Vincenzo Amendola; Stefano Scaramuzza; Stefano Agnoli; Gaetano Granozzi; Moreno Meneghetti; Giulio Campo; Valentina Bonanni; Francesco Pineider; Claudio Sangregorio; Paolo Ghigna; Stefano Polizzi; Pietro Riello; Stefania Fiameni; Luca Nodari
A frontier topic in nanotechnology is the realization of multifunctional nanoparticles (NPs) via the appropriate combination of different elements of the periodic table. The coexistence of Fe and Ag in the same nanostructure, for instance, is interesting for nanophotonics, nanomedicine, and catalysis. However, alloying of Fe and Ag is inhibited for thermodynamic reasons. Here, we describe the synthesis of Fe-doped Ag NPs via laser ablation in liquid solution, bypassing thermodynamics constraints. These NPs have an innovative structure consisting of a scaffold of face-centered cubic metal Ag alternating with disordered Ag–Fe alloy domains, all arranged in a truffle-like morphology. The Fe–Ag NPs exhibit the plasmonic properties of Ag and the magnetic response of Fe-containing phases, and the surface of the Fe–Ag NPs can be functionalized in one step with thiolated molecules. Taking advantage of the multiple properties of Fe–Ag NPs, the magnetophoretic amplification of plasmonic properties is demonstrated with proof-of-concept surface-enhanced Raman scattering and photothermal heating experiments. The synthetic approach is of general applicability and virtually permits the preparation of a large variety of multi-element NPs in one step.
Journal of Nanoparticle Research | 2013
Francesco Carlà; Giulio Campo; Claudio Sangregorio; Andrea Caneschi; César de Julián Fernández; Lourdes I. Cabrera
In this paper, we address the synthesis and characterization of the core@shell composite magneto-plasmonic cobalt ferrite–gold (Co-ferrite/Au) nanosystem. The synthesis Co-ferrite/Au nanocomposite is not obvious, hence it was of interest to generate it in a simple straightforward method. Co-ferrite/Au nanocomposite was generated by synthesizing first by thermal decomposition Co-ferrite nanoparticles (NPs). On a second step, ionic gold (Au3+) was reduced at the surface of Co-ferrite NPs by ultrasound, to obtain the metallic Au shell. The characterization of the nanomaterial was achieved by microscopy, spectroscopy, and performing magnetic measurements. However, what is attractive about our work is the use of electrochemical techniques as analytical tools. The key technique was cyclic voltammetry, which provided information about the nature and structure of the nanocomposite, allowing us to confirm the core@shell structure.
Applied Physics Letters | 2018
A. Serrano; O. Rodríguez de la Fuente; M. García-Hernández; Giulio Campo; C. de Julián Fernández; J. F. Fernández; M. A. García
In this work, we present an innovative way to functionalize large surfaces combining both plasmonic and magnetic nanoparticles on a substrate, by the growth of bilayers and a subsequent single annealing. In particular, we show here the formation of Au and γ-Fe2O3 nanoparticles using this route. Thermal treatments promote the nanostructuration of the film plus a partial oxidation of Fe to form ferrimagnetic oxides. For this purpose, annealing conditions and the structure of the bilayer must be selected to achieve an optimal nanostructuration, avoiding the full oxidation of Fe to form antiferromagnetic hematite.In this work, we present an innovative way to functionalize large surfaces combining both plasmonic and magnetic nanoparticles on a substrate, by the growth of bilayers and a subsequent single annealing. In particular, we show here the formation of Au and γ-Fe2O3 nanoparticles using this route. Thermal treatments promote the nanostructuration of the film plus a partial oxidation of Fe to form ferrimagnetic oxides. For this purpose, annealing conditions and the structure of the bilayer must be selected to achieve an optimal nanostructuration, avoiding the full oxidation of Fe to form antiferromagnetic hematite.
ACS Applied Materials & Interfaces | 2013
Silvia Taccola; Francesco Greco; Alessandra Zucca; Claudia Innocenti; César de Julián Fernández; Giulio Campo; Claudio Sangregorio; Barbara Mazzolai; Virgilio Mattoli
Journal of Physical Chemistry C | 2012
E Fantechi; Giulio Campo; Daniela Carta; Anna Corrias; C de Julian Fernandez; Dante Gatteschi; Claudia Innocenti; Francesco Pineider; F Rugi; Claudio Sangregorio
Journal of Physical Chemistry C | 2016
Gabriele C. Messina; Marco G. Sinatra; Valentina Bonanni; Rosaria Brescia; Alessandro Alabastri; Francesco Pineider; Giulio Campo; Claudio Sangregorio; Giovanni Li-Destri; Gianfranco Sfuncia; Giovanni Marletta; Marcello Condorelli; Remo Proietti Zaccaria; Francesco De Angelis; Giuseppe Compagnini
Chemistry of Materials | 2015
Giulio Campo; Francesco Pineider; Valentina Bonanni; Martin Albino; Andrea Caneschi; César de Julián Fernández; Claudia Innocenti; Claudio Sangregorio