The conductivity of high-fluence noble gas ion irradiated CVD polycrystalline diamond

• Published in: Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 406; pp. 676 - 679
• Main Authors: Borisov, A.M., Kazakov, V.A., Mashkova, E.S., Ovchinnikov, M.A., Shemukhin, A.A., Sigalaev, S.K.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2017
• Subjects: CVD polycrystalline diamond; High-fluence ion irradiation; Ion-induced conductivity; Noble gas ion; Raman spectra; Raman spectra; CVD polycrystalline diamond; Noble gas ion; High-fluence ion irradiation; Ion-induced conductivity
• ISSN: 0168-583X; 1872-9584
• DOI: 10.1016/j.nimb.2017.01.075

The conductivity of surface layer of polycrystalline CVD (Chemical Vapor Deposition) diamond has been studied experimentally after high-fluence 30keV Ne+, 20 and 30keV Ar+ ion irradiation at target temperature range from 30 to 400°C. The hot ion irradiation of CVD diamond may be described as ion-stimulated heat graphitization in which an exponential resistance decrease with increasing of the irradiation temperature is much faster than at the heat treatment. Under ion irradiation of CVD diamond the graphite-like materials resistivity is achieved at temperatures not exceeding 200°C. The graphite phase in a heterogeneous structure of diamond irradiated layer is in dynamic equilibrium. In the temperature range from RT to 400°C, the proportion of graphite phase increases so that at temperatures 200<Tir<400°C it is dominant. The Raman spectra of ion-induced conductive layer created on CVD diamond reflect the processes of nanostructural ordering – disordering of sp2-bonded carbon.