FisMat2017 - Submission - View

Abstract's title: In-situ Structural Study of the Synthesis of ZnO Nanoparticles and the Adsorption process of Thiol Ligands
Submitting author: Giuliana Aquilanti
Affiliation: Elettra - Sincrotrone Trieste
Affiliation Address: s.s. 14 km 163.5 34149 Basovizza, Trieste (TS)
Country: Italy
Oral presentation/Poster (Author's request): Poster
Other authors and affiliations: Clara Guglieri (Elettra - Sincrotrone Trieste), Luca Olivi (Elettra - Sincrotrone Trieste), Nicola Demitri (Elettra - Sincrotrone Trieste), Jasper Plaisier (Elettra - Sincrotrone Trieste)
Abstract

We report a real-time structural study of the synthesis of nanoparticles (NPs) capped with organic ligands. The present work focuses on the case of zinc oxide (ZnO) NPs capped with thiol (dodecanethiol and hexanethiol), which have attracted much attention due to their dual semiconductor and ferromagnetic properties. X-ray absorption Spectroscopy (both XANES and EXAFS regions) and X-ray Diff raction (XRD) measurements were carried out during the growth of the NPs, in order to gain a deeper understanding of the kinetic of the growing process and the thiol addition.
This is clearly important for tailoring the properties of these kind of systems. In a first step, it is found that while the NP's growth occurs and reaches the maximum size in 2 minutes, the local structure around Zn atoms needs around 20 minutes to be stabilized. In a second step, after adding the thiol, an initial fast adsorption of the thiol molecules takes place, followed by an slower process that ends with the stabilization of a core-shell structure.