Capsulate structure effect on SWNTs doping in RbxAg1−xI@SWNT composites

N. S. Falaleev; A. S. Kumskov; V. G. Zhigalina; I. I. Verbitskiy; A. L. Vasiliev; A. A. Makarova; D. V. Vyalikh; N. A. Kiselev; A. A. Eliseev

doi:10.1039/C7CE00155J

Capsulate structure effect on SWNTs doping in Rb_xAg_1−xI@SWNT composites†

N. S. Falaleev,

^a A. S. Kumskov,

^bcd V. G. Zhigalina,

^bcd I. I. Verbitskiy,^a A. L. Vasiliev,^bcd A. A. Makarova,^e D. V. Vyalikh,

^fgh N. A. Kiselev^b and A. A. Eliseev

*^a

Author affiliations

* Corresponding authors

^a Department of Materials Science, Moscow State University, Moscow, Russia
E-mail: eliseev@inorg.chem.msu.ru

^b Shubnikov Institute of Crystallography of Federal Scientific Research Centre “Crystallography and Photonics” of RAS, Moscow, Russia

^c National Research Centre "Kurchatov Institute", Moscow, Russia

^d Centre for surface and vacuum research (CSVR), Moscow, Russia

^e Institut für Festkörperphysik, Technische Universität Dresden, 01062 Dresden, Germany

^f Physics Department, Saint Petersburg State University, Saint Petersburg 198504, Russia

^g Donostia International Physics Center, Departamento de Fisica de Materiales and CFM-MPC UPV/EHU, Spain

^h IKERBASQUE, Basque Foundation for Science, 20080 San Sebastian, 48011 Bilbao, Spain

Abstract

The paper reports the relationship between single-walled carbon nanotube (SWNT) doping and capsulate crystal structure in Rb_xAg_1−xI@SWNT composites. The structures of one dimensional (1D) RbI, AgI and RbAg₄I₅ crystals inside single-walled carbon nanotubes were established by high-resolution transmission electron microscopy (HRTEM) and high-resolution scanning transmission electron microscopy (HAADF HRSTEM), and confirmed by image simulation. Opposite to one-dimensional RbI and AgI, inheriting the structure of bulk analogues, 1D RbAg₄I₅ forms a new phase within a confined space of the SWNT channel, which differs from the bulk RbAg₄I₅ structure and can be described by a deformed cubic 1D lattice. X-ray absorption, XPS, optical absorption and Raman spectroscopies were used for comprehensive study of the composites' electronic structures. The study reveals the donor behavior of RbI capsulate and the acceptor behavior of RbAg₄I₅ and AgI. Quantification of doping levels indicated the prevalence of the effect of the chemical composition of the capsulate on the overall doping efficiency, while a structural effect is mostly prominent in potential distribution on nanotube walls and partial charges on SWNT atoms.

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Article information

DOI: https://doi.org/10.1039/C7CE00155J
Article type: Paper
Submitted: 20 Jan 2017
Accepted: 05 May 2017
First published: 05 May 2017
This article is Open Access

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CrystEngComm, 2017,19, 3063-3070

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Capsulate structure effect on SWNTs doping in Rb_xAg_1−xI@SWNT composites

N. S. Falaleev, A. S. Kumskov, V. G. Zhigalina, I. I. Verbitskiy, A. L. Vasiliev, A. A. Makarova, D. V. Vyalikh, N. A. Kiselev and A. A. Eliseev, CrystEngComm, 2017, 19, 3063 DOI: 10.1039/C7CE00155J

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