Positron induced electron emission from graphene

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Abstract

We report here the energy spectra of positron-induced electrons emitted from single- and multilayer graphene films. One of UT Arlington's two Time of Flight positron beam systems was used to deposit very low energy (KE < 1.5 eV) positrons at the surface of graphene samples consisting of a) 1 layer of graphene on polycrystalline Cu and b) 6-8 layers of graphene deposited on polycrystalline Cu. A time of flight spectrometer was used to measure the energy of positron-induced electrons. A peak in the electron energy spectrum was observed at ∼263 eV corresponding to annihilation induced Auger electrons as a result of the KVV transition from the two graphene samples, which were comparable in intensity to that observed from a bulk graphite sample. In addition, we have observed a low energy peak in the annihilation induced electron energy spectra from graphene which extends up to ∼15 eV. Our observation that the positron annihilation induced KVV Auger signal from graphene has a significant intensity indicates that the low energy positrons can be efficiently trapped on the surface of graphene layer on Cu down to a single-layer.

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Chirayath, V. A., Gladen, R. W., Shastry, K., Chrysler, M. D., Fairchild, A. J., McDonald, A. D., … Weiss, A. H. (2017). Positron induced electron emission from graphene. In Journal of Physics: Conference Series (Vol. 791). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/791/1/012033

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