Speciation of Gold Nanoparticles by Ex Situ Extended X-ray Absorption Fine Structure and X-ray Absorption Near Edge Structure.
A combined X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) methodology is here presented on a series of partially and fully reduced Au(III) samples. This allows monitoring the relative fraction of Au(III) and Au(0) in the studied samples, displaying a consistent and independent outcome. The strategy followed is based, for the first time, on two structural models that can be fitted simultaneously, and it evaluates the correlation among strongly correlated parameters such as coordination number and the Debye-Waller factor. The results of the present EXAFS and XANES approach can be extended to studies based on X-ray absorption spectroscopy experiments for the in situ monitoring of the formation of gold nanoclusters.
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Marco
M
Giorgetti
Elettra Sincrotrone Trieste S.C.p.A. , s.s. 14 km 163.5, 34149 Basovizza, Trieste, Italy.
Giuliana
G
Aquilanti
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Barbara
B
Ballarin
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Mario
M
Berrettoni
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Maria Cristina
MC
Cassani
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Silvia
S
Fazzini
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Daniele
D
Nanni
Department of Industrial Chemistry "Toso Montanari", University of Bologna , Viale del Risorgimento 4, 40136 Bologna, Italy.
Domenica
D
Tonelli