Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver chloride

Author(s)
Marianna V. Kharlamova, Christian Kramberger, Oleg Domanov, Andreas Mittelberger, Kazuhiro Yanagi, Thomas Pichler, Dominik Eder
Abstract

In the present work, the channels of metallicity-sorted metallic single-walled carbon nanotubes (SWCNTs) have been filled with silver chloride. The data of high-resolution scanning transmission electron microscopy proved the filling of the nanotube channels and formation of few-atom-thick crystals of silver chloride. The electronic properties of the filled SWCNTs were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet photoelectron spectroscopy. Our results indicate the p-doping of nanotubes by silver chloride accompanied by the charge transfer from the nanotubes to the encapsulated compound and the downshift of the Fermi level by 0.36 eV. The calculated number of transferred electrons per nanotube carbon atom and the charge transfer density per nanotube length amounted to 0.0024 e(-) per carbon and 0.0406 e(-)/, respectively. It was found that the band gap opens up in the band structure of the filled SWCNTs resulting in their transition from metallic into a semiconducting state. This work reveals a direct influence of the incorporated silver chloride on the electronic properties of metallicity-sorted metallic SWCNTs and demonstrates the potential of precise Fermi level engineering of SWCNTs by filling their channels and achieving high doping levels, thus providing a platform for designing next-generation nanoelectronic devices.

Organisation(s)
Electronic Properties of Materials, Physics of Nanostructured Materials
External organisation(s)
Technische Universität Wien, Tokyo Metropolitan University
Journal
Journal of Materials Science
Volume
53
Pages
13018-13029
No. of pages
12
ISSN
0022-2461
DOI
https://doi.org/10.1007/s10853-018-2575-y
Publication date
09-2018
Peer reviewed
Yes
Austrian Fields of Science 2012
Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/fermi-level-engineering-of-metallicitysorted-metallic-singlewalled-carbon-nanotubes-by-encapsulation-of-fewatomthick-crystals-of-silver-chloride(9b349e1b-b607-4b75-9620-5554cc038cb3).html