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Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2)
We present two-dimensional Mg(OH)(2) sheets and their vertical heterojunctions with CVD-MoS(2) for the first time as flexible 2D insulators with anomalous lattice vibration and chemical and physical properties. New hydrothermal crystal growth technique enabled isolation of environmentally stable mon...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742812/ https://www.ncbi.nlm.nih.gov/pubmed/26846617 http://dx.doi.org/10.1038/srep20525 |
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author | Suslu, Aslihan Wu, Kedi Sahin, Hasan Chen, Bin Yang, Sijie Cai, Hui Aoki, Toshihiro Horzum, Seyda Kang, Jun Peeters, Francois M. Tongay, Sefaattin |
author_facet | Suslu, Aslihan Wu, Kedi Sahin, Hasan Chen, Bin Yang, Sijie Cai, Hui Aoki, Toshihiro Horzum, Seyda Kang, Jun Peeters, Francois M. Tongay, Sefaattin |
author_sort | Suslu, Aslihan |
collection | PubMed |
description | We present two-dimensional Mg(OH)(2) sheets and their vertical heterojunctions with CVD-MoS(2) for the first time as flexible 2D insulators with anomalous lattice vibration and chemical and physical properties. New hydrothermal crystal growth technique enabled isolation of environmentally stable monolayer Mg(OH)(2) sheets. Raman spectroscopy and vibrational calculations reveal that the lattice vibrations of Mg(OH)(2) have fundamentally different signature peaks and dimensionality effects compared to other 2D material systems known to date. Sub-wavelength electron energy-loss spectroscopy measurements and theoretical calculations show that Mg(OH)(2) is a 6 eV direct-gap insulator in 2D, and its optical band gap displays strong band renormalization effects from monolayer to bulk, marking the first experimental confirmation of confinement effects in 2D insulators. Interestingly, 2D-Mg(OH)(2) sheets possess rather strong surface polarization (charge) effects which is in contrast to electrically neutral h-BN materials. Using 2D-Mg(OH)(2) sheets together with CVD-MoS(2) in the vertical stacking shows that a strong change transfer occurs from n-doped CVD-MoS(2) sheets to Mg(OH)(2), naturally depleting the semiconductor, pushing towards intrinsic doping limit and enhancing overall optical performance of 2D semiconductors. Results not only establish unusual confinement effects in 2D-Mg(OH)(2), but also offer novel 2D-insulating material with unique physical, vibrational, and chemical properties for potential applications in flexible optoelectronics. |
format | Online Article Text |
id | pubmed-4742812 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-47428122016-02-09 Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) Suslu, Aslihan Wu, Kedi Sahin, Hasan Chen, Bin Yang, Sijie Cai, Hui Aoki, Toshihiro Horzum, Seyda Kang, Jun Peeters, Francois M. Tongay, Sefaattin Sci Rep Article We present two-dimensional Mg(OH)(2) sheets and their vertical heterojunctions with CVD-MoS(2) for the first time as flexible 2D insulators with anomalous lattice vibration and chemical and physical properties. New hydrothermal crystal growth technique enabled isolation of environmentally stable monolayer Mg(OH)(2) sheets. Raman spectroscopy and vibrational calculations reveal that the lattice vibrations of Mg(OH)(2) have fundamentally different signature peaks and dimensionality effects compared to other 2D material systems known to date. Sub-wavelength electron energy-loss spectroscopy measurements and theoretical calculations show that Mg(OH)(2) is a 6 eV direct-gap insulator in 2D, and its optical band gap displays strong band renormalization effects from monolayer to bulk, marking the first experimental confirmation of confinement effects in 2D insulators. Interestingly, 2D-Mg(OH)(2) sheets possess rather strong surface polarization (charge) effects which is in contrast to electrically neutral h-BN materials. Using 2D-Mg(OH)(2) sheets together with CVD-MoS(2) in the vertical stacking shows that a strong change transfer occurs from n-doped CVD-MoS(2) sheets to Mg(OH)(2), naturally depleting the semiconductor, pushing towards intrinsic doping limit and enhancing overall optical performance of 2D semiconductors. Results not only establish unusual confinement effects in 2D-Mg(OH)(2), but also offer novel 2D-insulating material with unique physical, vibrational, and chemical properties for potential applications in flexible optoelectronics. Nature Publishing Group 2016-02-05 /pmc/articles/PMC4742812/ /pubmed/26846617 http://dx.doi.org/10.1038/srep20525 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Suslu, Aslihan Wu, Kedi Sahin, Hasan Chen, Bin Yang, Sijie Cai, Hui Aoki, Toshihiro Horzum, Seyda Kang, Jun Peeters, Francois M. Tongay, Sefaattin Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title | Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title_full | Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title_fullStr | Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title_full_unstemmed | Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title_short | Unusual dimensionality effects and surface charge density in 2D Mg(OH)(2) |
title_sort | unusual dimensionality effects and surface charge density in 2d mg(oh)(2) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742812/ https://www.ncbi.nlm.nih.gov/pubmed/26846617 http://dx.doi.org/10.1038/srep20525 |
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