G
Giorgio Speranza
Researcher at fondazione bruno kessler
Publications - 199
Citations - 3538
Giorgio Speranza is an academic researcher from fondazione bruno kessler. The author has contributed to research in topics: X-ray photoelectron spectroscopy & Thin film. The author has an hindex of 28, co-authored 184 publications receiving 2762 citations. Previous affiliations of Giorgio Speranza include Kurchatov Institute & National University of Ireland, Galway.
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Proceedings ArticleDOI
Electron confinement effects in silver nanocluster embedded in sodalime glasses
Giorgio Speranza,Luca Minati,A. Chiappini,Alessandro Chiasera,C. Arfuso Duverger,Maurizio Ferrari,Giancarlo C. Righini +6 more
TL;DR: In this article, the role of Ag concentration in relation to the chemical state of silver in the glassy matrix was analyzed using X-ray Photoelectron Spectroscopy (PES).
Proceedings ArticleDOI
X-Ray photoelectron spectroscopy of SiO2-HfO2 amorphous and glass- ceramic waveguides: a comparative study.
Luca Minati,Giorgio Speranza,S. Torrengo,Guillaume Alombert-Goget,Mariano Ferrari,Yoann Jestin,Giancarlo C. Righini +6 more
TL;DR: In this paper, X-ray photoelectron spectroscopy (XPS) was used to characterize xHfO2 - (100-x) SiO2 (x = 10, 20, 30, 40 mol%) glass-ceramic waveguides, doped with 0.3======mol% Er3+ ions, and provided a detailed description of the mechanisms underlying the structural properties of the two different silica-hafnia systems.
Journal ArticleDOI
Chemical Reduction of GO: Comparing Hydroiodic Acid and Sodium Borohydride Chemical Approaches by X-ray Photoelectron Spectroscopy
Wei Li,Giorgio Speranza +1 more
TL;DR: In this paper , the efficiency of two wet chemical processes based on hydroiodic acid (HI) and sodium borohydride (NaBH4) used to reduce graphene oxide (GO) have been studied.
Journal ArticleDOI
Surface modification and characterization of GO/polymer thin coatings as excellent bio-active platforms for tissue regeneration.
TL;DR: Plasma functionalized and stabilized Graphene Oxide thin layers in a hybrid with amorphous carbon induced the expression of vascular endothelial growth factor and osteoprotegerin growth factors in fibroblasts and osteoblasts confirming the suitability for tissue regeneration and osteo-integration applications.
Journal ArticleDOI
Dose-dependent genotoxicity of ammonia-modified graphene oxide particles in lung cancer cells
Kamelia Hristova-Panusheva,Milena Keremidarska-Markova,Tonya D. Andreeva,Giorgio Speranza,Dayong Wang,Milena Georgieva,George Miloshev,Natalia Krasteva +7 more
TL;DR: The presented results suggest that ammonia-modified GO NPs applied at concentrations higher than 20 μg/ml induced stronger toxicity effect in A549 cells compared to pristine GO and that the use of low concentrations of GO and GO-NH2 NPs is important to avoide adverse biological effects.