Speaker
Descrizione
Electron spectroscopies are well-established techniques, largely employed for the investigations of the surface chemical composition of a huge number of solid-state materials. The peculiarity of these techniques lies in their ability to probe a very tiny layer of the investigated materials, within the range of 1 ÷ 10 nm. Therefore, they represent a powerful tool for the study of nanomaterials. As it is well known, within the big family of nanomaterials are included nanoparticles, nanorods, nanowires, nanofilms, 2D-materials, etc., basically, all materials characterized by at least one dimension in the range of nanometers scale. The most popular techniques employed to study the nanomaterials are the microscopies, like SEM, AFM, STM, etc., but also spectroscopies like Raman spectroscopy, FTIR, Energy dispersive analysis (EDS), etc. However, the most surface sensitive techniques are the electron spectroscopies, which can provide information on the chemical state of the detected elements. They include X-ray Photoelecton Spectroscopy (XPS), Auger Electron Spectroscopy (AES), Ultraviolet Photoelectron Spectroscopy (UPS) and Energy Electron Loss Spectroscopy.
This presentation will give an overview of the main results obtained from the study of various nanostructured materials. Depending on the materials, it was alternatively employed XPS, AES and UPS, in order to determine the surface elemental composition of nanoparticles, nanofilms and 2d-materials [1], surface elemental distribution performed by XPS and AES microscopies [2], the work function calculation by UPS [3] and the D parameter used for the detection of the concentration of C-sp2 and C-sp3 hybridization in carbon-based materials, but also to detect the chemical modifications passing from graphite, to graphene oxide and reduced graphene oxide [4].
[1] Bolli E., Kaciulis S., Mezzi A. ESCA as a Tool for Exploration of Metals’ Surface. Coatings. 2020, 10: 1182. doi.org/10.3390/coatings10121182
[2] Mezzi A., Kaciulis S., Brucale M., Gentili D., Barbalinardo M., Durso M., Melucci M., Cavallini M. Surface immobilization of functional molecules by reactive self-assembling. SIA. 2016; 48: 626. doi.org/10.1002/sia.5979Digital Object Identifier (DOI)
[3] Mezzi A., Bolli E., Kaciulis S., Bellucci A., Paci B., Generosi A., Mastellone M., Serpente V., Trucchi D.M. Multi-Technique Approach for Work Function Exploration of Sc2O3 Thin Films. Nanomaterials. 2023; 13: 1430. doi.org/10.3390/nano13081430
[4] Kaciulis S., Mezzi A., Soltani P., de Caro T., Xia H., Wang T.L., Zhai T., Lavorgna M. Reduction of graphene oxide by UHV annealing. SIA; 50:1089. doi.org/10.1002/sia.6424Digital Object Identifier (DOI)
| Giovane Ricercatore (under 40) | No |
|---|
