Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Nanostructures at Surfaces III
O 33.9: Vortrag
Dienstag, 12. März 2013, 12:30–12:45, H45
Scanning probe microscopy and spectroscopy of nanodiamonds under illumination. — •Rémy Pawlak1, Thilo Glatzel1, Shigeki Kawai1, Sweetlana Fremy1, Loïc Schmidlin2, Vincent Pichot2, Denis Spietzel2, and Ernst Meyer1 — 1Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland. — 2Nanomatériaux pour des Systèmes Sous Sollicitations Extrêmes (NS3E) UMR 3208 ISL/CNRS Institut franco-allemand de recherches de Saint-Louis (ISL), 5 rue du Général Cassagnou, 68300 Saint-Louis, France.
Nanodiamonds (ND) are carbon particles with size from 2 to few tens of nanometers which already have broad applications in polishing materials, lubricants as well as applications in biomedical imaging. More recently, the accurate control of the doping of the nanodiamond structure with atomic defects,such as Nitrogen-Vacancy centers (NV-1), having optical and spin properties gives to this material an exceptional candidate for photonic devices and quantum information processing and computing. Here, we combine scanning probe microscopy imaging and spectroscopy to investigate at the atomic scale single nanodiamonds/HOPG. Under illumination with wavelenghts of 400 nm and 470 nm, a modulation of the electronic band gap as well as the contact potential difference (CPD) between tip and sample is observed compared to the dark condition, whereas no relevant variation is obtained for wavelenghts superior to 590 nm. This effect is a direct evidence of the light-induced charges arising from the NV centers of nanodiamonds.