Theoretical study of carbon-based tips for scanning tunnelling microscopy

Abstract : Motivated by recent experiments, we present here a detailed theoretical analysis of the use of carbon-based conductive tips in scanning tunnelling microscopy. In particular, we employ ab initio methods based on density functional theory to explore a graphitic, an amorphous carbon and two diamond-like tips for imaging with a scanning tunnelling microscope (STM), and we compare them with standard metallic tips made of gold and tungsten. We investigate the performance of these tips in terms of the corrugation of the STM images acquired when scanning a single graphene sheet. Moreover, we analyse the impact of the tip-sample distance and show that it plays a fundamental role in the resolution and symmetry of the STM images. We also explore in depth how the adsorption of single atoms and molecules in the tip apexes modifies the STM images and demonstrate that, in general, it leads to an improved image resolution. The ensemble of our results provides strong evidence that carbon-based tips can significantly improve the resolution of STM images, as compared to more standard metallic tips, which may open a new line of research in scanning tunnelling microscopy.
Type de document :
Article dans une revue
Nanotechnology, Institute of Physics, 2016, 27 (10), pp.105201. 〈10.1088/0957-4484/27/10/105201〉
Liste complète des métadonnées

https://hal-cea.archives-ouvertes.fr/cea-01490973
Contributeur : Dominique Girard <>
Soumis le : jeudi 16 mars 2017 - 11:11:22
Dernière modification le : jeudi 15 mars 2018 - 15:05:05
Document(s) archivé(s) le : samedi 17 juin 2017 - 13:40:30

Fichier

González_2016_27_105201.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

C González, E Abad, Yannick J. Dappe, J C Cuevas. Theoretical study of carbon-based tips for scanning tunnelling microscopy. Nanotechnology, Institute of Physics, 2016, 27 (10), pp.105201. 〈10.1088/0957-4484/27/10/105201〉. 〈cea-01490973〉

Partager

Métriques

Consultations de la notice

134

Téléchargements de fichiers

31