Characterization of Nanomaterials By X-RAY Diffraction

 

TITLE

Characterization of Nanomaterials By X-RAY Diffraction

STAFF

Antonietta Guagliardi
Cinzia Giannini
Liberato De Caro
Massimo Ladisa
Giuseppe Chita
Rocco Lassandro
[*] Personale non strutturato: Federica Trudu, Davide Altamura

CNR MODULE

Commessa:  PM.P04.011 / Diffrazione e imaging a raggi x per l'ingegneria di materiali nanostrutturati e tessuti biologici e per la biodiagnostica
Modulo: PM.P04.011.001 / Sviluppo di metodi e caratterizzazione di materiali cristallini alla nano, micro e mesoscala

KEYWORDS

Nanocrystals, Powder Diffration, Total Scattering Methods, Metal Nanoparticles, Oxides Nanoparticles, Nanoporous Coordination Polymers

COLLABORATIONS
Synchrotron Light Source (SLS) & Paul Scherrer Institute (PSI), Switzerland;
University of Granada, Spain;
University of Insubria, Italy;
Stazione Sperimentale della Seta, Italy;
University of Milan, Italy;
DESCRIPTION

The unique properties of materials whose size is at the scale of a few nm (< 10), have opened new scenarios in a number of fields: optics, opto-electronics, catalysis, magnetic materials, bio-medicine, enviroment. etc. For polycristalline nanomaterials, diffraction techniques and Total Scattering methods, such as Pair Distribution and Debye Functions, are the most effective for characterizing their structure and microstructure, for controlling the structure-properties relationships and for tailoring the synthesis towards optimized performances. In fact, short-range order, structural defects and surface effects turn into broad and unpredictably shaped Bragg peaks and diffuse intensity among them, which make the Rietveld approach quite unfeasible. The Debye Function approach is implemented in a new, Free Source Package, Debussy (link), which is under continuous development and has been used to characterize, in terms of crystal structure, size and shape of domains, number or mass phase fractions, the following types of material: 1) Metal and Iron Oxide Nanoparticles, synthesized inside the cavity of a protein (apoferritin) and showing relevant magnetic properties for biomedical applications. 2) TiO2 Nanoparticles showing antibacterial properties suitable for textiles, plastics and varnishes of great interest for industrial and environmental applications. Different polymorphs have been investigated for correlating the photocatalytic activity to (micro)structural features. 3) Coordination Polymers with Functional Properties, such as nanoporous Metal Organic Frameworks (MOFs) for gas separation and storage, and Carbonyl Species showing catalytic activity. 4) High Nuclearity Carbonyl Clusters in solution, such as [Pt19(CO)22]2- and [Pt38(CO)44]2-, for the first time characterized through DF.

1) and 2) refers to the Project Cariplo No. 2009-2446.



CONTACTS

 

Guagliardi Antonietta
Email : antonietta.guagliardiATic.cnr.it
Tel : +39 031-2386636

 

Last Updated (Monday, 06 December 2010 10:34)