Comparative analysis of the secondary electron yield from carbon nanoparticles and pure water medium

TL;DR

This study compares secondary electron yields from carbon nanoparticles and water under proton irradiation, revealing that nanoparticles significantly enhance low-energy electron production due to plasmon excitations, with implications for sensitizer design.

Contribution

It demonstrates that carbon nanoparticles increase low-energy electron yield via plasmon response, providing new insights into nanoscale electron emission mechanisms.

Findings

Carbon nanoparticles enhance low-energy electron yield compared to water.

Plasmon excitations in nanoparticles are key to electron yield enhancement.

Solid carbon nanoparticles produce several times more electrons than water.

Abstract

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.