Surface States of (100) O-Terminated Diamond: Towards Other 1 × 1:O Reconstruction Models
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Author/sAlba, Gonzalo; Villar Castro, María del Pilar; Alcántara Puerto, Rodrigo; Navas Pineda, Francisco Javier; Araújo Gay, Daniel
DepartmentCiencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica; Química Física
SourceNanomaterials 2020, 10(6), 1193
Diamond surface properties show a strong dependence on its chemical termination. Hydrogen-terminated and oxygen-terminated diamonds are the most studied terminations with many applications in the electronic and bioelectronic device field. One of the main techniques for the characterization of diamond surface terminations is X-ray photoelectron spectroscopy (XPS). In this sense, the use of angle-resolved XPS (ARXPS) experiments allows obtaining depth-dependent information used here to evidence (100)-O-terminated diamond surface atomic configuration when fabricated by acid treatment. The results were used to compare the chemistry changes occurring during the oxidation process using a sublayer XPS intensity model. The formation of non-diamond carbon phases at the subsurface and higher oxygen contents were shown to result from the oxygenation treatment. A new (100) 1 x 1:O surface reconstruction model is proposed to explain the XPS quantification results of O-terminated diamond.