Localized Graphitization on Diamond Surface as a Manifestation of Dopants
At a Glance
Section titled âAt a Glanceâ| 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 | Keio University, National Institute for Materials Science |
| Citations | 15 |
Abstract
Section titled âAbstractâAbstract 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, lowâtemperature scanning tunneling microscopy is utilized to investigate the atomicâscale morphology and electronic structures of (100)â and (111)âoriented boronâdoped diamond (BDD) electrodes. Graphitized domains of a few nanometers are shown to manifest the effects of boron dopants on the BDD surface. Confirmed by firstâprinciples calculations, local density of states measurements reveal that the electronic structure of these features is characterized by inâgap states induced by boronârelated lattice deformation. The dopantârelated graphitization is uniquely observed in BDD (111), which explains its electrochemical superiority over the (100) facet. These experimental observations provide atomicâscale information about the role of dopants in modulating the conductivity of diamond, as well as, possibly, other functional doped materials.