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Data for Linear and helical cesium iodide atomic chains in ultranarrow single-walled carbon nanotubes : impact on optical properties
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Kashtiban, Reza J., Burdanova, Maria G., Vasylenko, Andrij, Wynn, Jamie, Medeiros, Paulo V. C., Ramasse, Quentin, Morris, Andrew J., Quigley, David, Lloyd-Hughes, James and Sloan, Jeremy (2021) Data for Linear and helical cesium iodide atomic chains in ultranarrow single-walled carbon nanotubes : impact on optical properties. [Dataset]
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Official URL: http://wrap.warwick.ac.uk/156210/
Abstract
One-dimensional (1D) atomic chains of CsI were previously reported in double-walled carbon nanotubes with ∼0.8 nm inner diameter. Here, we demonstrate that, while 1D CsI chains form within narrow ∼0.73 nm diameter single-walled carbon nanotubes (SWCNTs), wider SWCNT tubules (∼0.8 1.1 nm) promote the formation of helical chains of CsI 2 × 1 atoms in cross-section. These CsI helices create complementary oval distortions in encapsulating SWCNTs with highly strained helices formed from strained Cs2I2 parallelogram units in narrow tubes to lower strain Cs2I2 units in wider tubes. The observed structural changes and charge distribution were analyzed by density functional theory and Bader analysis. CsI chains also produce conformation-selective changes to the electronic structure and optical properties of the encapsulating tubules. The observed defects are an interesting variation from defects commonly observed in alkali halides as these are normally associated with the Schottky and Frenkel type. The energetics of CsI 2 × 1 helix formation in SWCNTs suggests how these could be controllably formed.
Item Type: | Dataset | ||||||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
Type of Data: | Experimental Data | ||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Atoms, Carbon nanotubes, Electron microscopy, Density functionals, Raman spectroscopy, Photoluminescence | ||||||||||||||||||
Publisher: | University of Warwick, Department of Physics | ||||||||||||||||||
Official Date: | 29 July 2021 | ||||||||||||||||||
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Status: | Not Peer Reviewed | ||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||
Media of Output (format): | HRTEM images ; .pdb ; HAADF images ; Spectrum Images ; EELS spectra ; Structure models | ||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
Copyright Holders: | University of Warwick | ||||||||||||||||||
Description: | The files in folder 1 are HRTEM images, Image Simulations and Structure models used to produce Figures 1a-h. The images are are best visualised using the free offline version of Gatan Microscopy Suite 3 (i.e. GMS3) incorporating the EELS/EFTEM Suite (i.e. useful for Figure 3). This is free to download at https://www.gatan.com/enabling-researcher-access-gms-3-during-covid-19-lab-closures The files in folder 2 are HRTEM images, Image Simulations, Struture models and HAADF images used to produce Figures 2a-g. The images are are best visualised using the free offline version of Gatan Microscopy Suite 3 (i.e. GMS3) incorporating the EELS/EFTEM Suite (i.e. useful for Figure 3). This is free to download at https://www.gatan.com/enabling-researcher-access-gms-3-during-covid-19-lab-closures The files in folder 3 are the raw HAADF images, Spectrum Images and EELS spectra used to produce Figures 3a-i. Note that, due to the cumbersome and specialised nature of the data, these are best visualised using the free offline version of Gatan Microscopy Suite 3 (i.e. GMS3) incorporating the EELS/EFTEM Suite. This is free to download at https://www.gatan.com/enabling-researcher-access-gms-3-during-covid-19-lab-closures The files in folder 4 were used in the production of Figs. 4a-c and include The calculated Energy/Ion Pair with Helical Pitch (Fig. 4a folder); Model structures for 1D, 2X1 and 2X2 CsI@CNTs of various diameters and the calculated formation enthalpies for these structures (Fig. 4b folder); Calculated charges for these and 1D_I@CNT structures (Fig. 4c folder). The files in folder 5 are HRTEM images, Structure models and HAADF images used to produce Figures 5a-g. The images are are best visualised using the free offline version of Gatan Microscopy Suite 3 (i.e. GMS3) incorporating the EELS/EFTEM Suite (i.e. useful for Figure 3). This is free to download at https://www.gatan.com/enabling-researcher-access-gms-3-during-covid-19-lab-closures The files in folder 6 contain the raw spectroscopy data used to produce Figures 6a-d and include the Raman Data (Fig6a folder), the optical absorption spectra (Fig6b folder) and also the Photoluminescence (i.e. PL) data (Fig6c-d folder). Note that Fig6c was produced by taking sections through the PL data at 650 nm (top) and 575 nm (bottom) respectively (i.e. see dotted lines on Figure 6d, main manuscript) |
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Date of first compliant deposit: | 29 July 2021 | ||||||||||||||||||
Date of first compliant Open Access: | 29 July 2021 | ||||||||||||||||||
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