Regensburg 2004 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

CPP: Chemische Physik und Polymerphysik

CPP 12: Colloids and Nanoparticles II

CPP 12.6: Vortrag

Montag, 8. März 2004, 17:00–17:15, H 39

High-resolution photoemission study of CdS nanoparticles with narrow size distribution: preparation, different sulfur components, and beam damage effects — •Sanjeev Joshi1, L. Weinhardt1, C. Kumpf1, S. K. Kulkarni2, R. Fink3, C. Heske1, and E. Umbach11Exp. Phys. II, Univ. Würzburg, 97074 Würzburg — 2Dept. Physics, Univ. Pune, Pune 411 007, India — 3Phys. Chem. II, Univ. Erlangen, 91058 Erlangen

We report on high resolution X-ray photoemission data of very small CdS nanoparticles of two different sizes, 1.4 nm and 2.7 nm diameter, respectively. A detailed analysis is performed to identify the sizes and their distribution and the various signal constituents. The signal is composed of five S components, which can be assigned to the S atoms of the particle in different environments. The peak assignment is done by comparing the experimental data with intensity estimates, considering the intensity attenuation and contributions of the various S atoms using three structural models. Furthermore, it is discussed how beam damage can be induced and how it is identified and controlled by recording very fast photoemission scans. A quantitative description based on successively collected spectra is developed. The influence of different thin film sample preparation methods on the photoemission signal is discussed as well.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2004 > Regensburg