https://doi.org/10.1140/epjd/e2015-50908-y
Regular Article
Comparative analysis of the secondary electron yield from carbon nanoparticles and pure water medium*
1 MBN Research Center, Altenhöferallee 3, 60438 Frankfurt am Main, Germany
2 A.F. Ioffe Physical-Technical Institute, Politekhnicheskaya ul. 26, 194021 St. Petersburg, Russia
3 Centre for Medical Radiation Physics (CMRP), University of Wollongong, NSW, Australia
4 Departament de Física Aplicada, Universitat d’Alacant, Alicante, Spain
5 Department of Physical Sciences, The Open University, Milton Keynes, UK
6 Department of Physics, Oakland University, Rochester, Michigan 48309, USA
7 Illawarra Health and Medical Research Institute (IHMRI), University of Wollongong, NSW, Australia
8 Department of Physics, St. Petersburg State Maritime Technical University, Leninskii pr. 101, 198262 St. Petersburg, Russia
a
e-mail: verkhovtsev@fias.uni-frankfurt.de
Received: 23 December 2014
Received in final form: 24 February 2015
Published online: 23 April 2015
The production of secondary electrons generated by carbon nanoparticles and pure water medium irradiated by fast protons is studied by means of model approaches and Monte Carlo simulations. It is demonstrated that due to a prominent collective response to an external field, the nanoparticles embedded in the medium enhance the yield of low-energy electrons. The maximal enhancement is observed for electrons in the energy range where plasmons, which are excited in the nanoparticles, play the dominant role. Electron yield from a solid carbon nanoparticle composed of fullerite, a crystalline form of C60 fullerene, is demonstrated to be several times higher than that from liquid water. Decay of plasmon excitations in carbon-based nanosystems thus represents a mechanism of increase of the low-energy electron yield, similar to the case of sensitizing metal nanoparticles. This observation gives a hint for investigation of novel types of sensitizers to be composed of metallic and organic parts.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2015
