Personne

Giorgio Margaritondo

Publications associées (443)

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X-ray irradiation synthesis of PEG-coated Au-Pd nanoparticles

Giorgio Margaritondo, Ying Chen

We demonstrate that the combination of x-ray irradiation and capping by polyethylene glycol (PEG) produces excellent flexibility in controlling the structure of Au–Pd nanoparticles while preserving their catalytic performance. We specifically adopted two d ...

2015

Uncapped Au–Pd colloidal nanoparticles show catalytic enhancement

Giorgio Margaritondo, Ying Chen

The catalytic properties of Pd have triggered a strong interest in the related catalysis by Au–Pd nanoparticles. However, the analysis of such phenomena has been complicated so far due to the presence of capping. Using X-ray irradiation, we produced uncapp ...

2015

We show that by using different x-ray irradiation times of BSA-coated Au nanoparticles (NPs) we can change their ultraviolet-stimulated photoluminescence and shift the spectral weight over the visible spectral range. This is due to the interplay of two emi ...

2015

Surface thiolation affects the size of gold nanoparticles and the presence of visible luminescence under UV stimulation. We explored these phenomena by analysing alkanethiolate coatings with different carbon chain lengths, from 3-mercaptopropionic acid to ...

2015

X-ray Spectrometry and imaging for ancient handwritten document

Giorgio Margaritondo, Frédéric Kaplan, Fauzia Albertin, Marco Stampanoni

We detected handwritten characters in ancient documents from several centuries with different synchrotron x-ray imaging techniques. The results were correlated to those of x-ray fluorescence analysis. In most cases, heavy elements produced high image quali ...

2014

A compact synchrotron-based transmission X-ray microscope

Giorgio Margaritondo, Ying Chen

A compact transmission X-ray microscope has been designed and implemented based on a cylindrical symmetry around the optical axis that sharply limits the instabilities due to thermal mechanical drift. Identical compact multi-axis closed-loop actuation modu ...

Wiley-Blackwell2014

Firefly Light Flashing: Oxygen Supply Mechanism

Giorgio Margaritondo

Firefly luminescence is an intriguing phenomenon with potential technological applications, whose biochemistry background was only recently established. The physics side of this phenomenon, however, was still unclear, specifically as far as the oxygen supp ...

2014

Virtual X-ray Reading (VXR) of Ancient Administrative Handwritten Documents

Giorgio Margaritondo, Frédéric Kaplan, Fauzia Albertin, Marco Stampanoni

The study of ancient documents is too often confined to specimens of high artistic value or to official writings. Yet, a wealth of information is often stored in administrative records such as ship records, notary papers, work contract, tax declaration, co ...

2014

Firefly Light Flashing: Oxygen Supply Mechanism

Giorgio Margaritondo

2014

Very small photoluminescent gold nanoparticles for multimodality biomedical imaging

Giorgio Margaritondo

An original synthesis method based on X-ray irradiation produced gold nanoparticles (AuNPs) with two important properties for biomedical research: intense visible photoluminescence and very high accumulation in cancer cells. The nanoparticles, coated with ...

Elsevier2013