Eur. Phys. J. Appl. Phys.
Volume 85, Number 2, February2019
|Number of page(s)||15|
|Section||Surfaces and Interfaces|
|Published online||08 March 2019|
The effect of low-energy Ar+ irradiation on the surface of monocrystalline α-Al2O3 (0001)
Comisión Nacional de Energía Atómica (CNEA), San Martín, Buenos Aires, Argentina
2 División Recubrimientos y Tribología, Gerencia Materiales, Comisión Nacional de Energía Atómica (CNEA), Av. Gral. Paz 1499 (B1650KNA), San Martín, Buenos Aires, Argentina
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Received in final form: 28 December 2018
Accepted: 11 February 2019
Published online: 8 March 2019
Single crystals α-Al2O3 (0001) were exposed to the energetic Ar+-ions for two periods of 4 min with kinetic energy of 2 keV and 4 min of 5 keV at an incident angle of 45°. The samples were studied by X-ray photoemission spectroscopy (XPS) before and after Ar+-ion beam exposure. The average values of the bandgap energy before and after Ar+-ion beam treatment were measured to be (7.8 ± 0.2) eV and (6.3 ± 0.2) eV, respectively. The dynamic change in the XPS spectra of the valence band (VB) region before and after Ar+-ion beam treatment were explained using the theoretical calculation of the density of state (DOS) and the molecular orbital (MO) theory. This change is attributed to the transformation of α-phase to γ-Al2O3 phase at the surface. The surface morphology of the samples before and after Ar+-ion bombardment was also examined using scanning electron microscopy (SEM). Creation of circular well-shaped nanoholes with diameters in the range of (20–550) nm was observed at the surface after exposure to 2 keV Ar+-ions. Whereas, a series of irregular nanovoids were observed on the surface of the sample which was exposed to 5 keV Ar+-ions.
© EDP Sciences, 2019
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