Localized Graphitization on Diamond Surface as a Manifestation of Dopants
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-09-06 |
| Journal | Advanced Materials |
| Authors | Francesca Celine I. Catalan, Le The Anh, Junepyo Oh, Emiko Kazuma, Norihiko Hayazawa |
| Institutions | RIKEN, National Institute for Materials Science |
| Citations | 15 |
Abstract
Section titled āAbstractāAbstract Doped diamond electrodes have attracted significant attention for decades owing to their excellent physical and electrochemical properties. However, direct experimental observation of dopant effects on the diamond surface has not been available until now. Here, lowātemperature scanning tunneling microscopy is utilized to investigate the atomicāscale morphology and electronic structures of (100)ā and (111)āoriented boronādoped diamond (BDD) electrodes. Graphitized domains of a few nanometers are shown to manifest the effects of boron dopants on the BDD surface. Confirmed by firstāprinciples calculations, local density of states measurements reveal that the electronic structure of these features is characterized by ināgap states induced by boronārelated lattice deformation. The dopantārelated graphitization is uniquely observed in BDD (111), which explains its electrochemical superiority over the (100) facet. These experimental observations provide atomicāscale information about the role of dopants in modulating the conductivity of diamond, as well as, possibly, other functional doped materials.