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Title: Angle resolved vibrational properties of anisotropic transition metal trichalcogenide nanosheets
Authors: Kong, Wilson
Bacaksız, Cihan
Chen, Bin
Wu, Kedi
Blei, Mark
Fan, Xi
Shen, Yuxia
Şahin, Hasan
Wright, David
Narang, Deepa S.
Tongay, Sefaattin
Keywords: Anisotropy
Transition metals
Issue Date: Mar-2017
Publisher: Royal Society of Chemistry
Source: Kong, W., Bacaksız, C., Chen, B., Wu, K., Blei, M., Fan, X., Shen, Y., ...Tongay, S. (2017). Angle resolved vibrational properties of anisotropic transition metal trichalcogenide nanosheets. Nanoscale, 9(12), 4175-4182. doi:10.1039/c7nr00711f
Abstract: Layered transition metal trichalcogenides (TMTCs) are a new class of anisotropic two-dimensional materials that exhibit quasi-1D behavior. This property stems from their unique highly anisotropic crystal structure where vastly different material properties can be attained from different crystal directions. Here, we employ density functional theory predictions, atomic force microscopy, and angle-resolved Raman spectroscopy to investigate their fundamental vibrational properties which differ significantly from other 2D systems and to establish a method in identifying anisotropy direction of different types of TMTCs. We find that the intensity of certain Raman peaks of TiS3, ZrS3, and HfS3 have strong polarization dependence in such a way that intensity is at its maximum when the polarization direction is parallel to the anisotropic b-axis. This allows us to readily identify the Raman peaks that are representative of the vibrations along the b-axis direction. Interestingly, similar angle resolved studies on the novel TiNbS3 TMTC alloy reveal that determination of anisotropy/crystalline direction is rather difficult possibly due to loss of anisotropy by randomization distribution of quasi-1D MX6 chains by the presence of defects which are commonly found in 2D alloys and also due to the complex Raman tensor of TMTC alloys. Overall, the experimental and theoretical results establish non-destructive methods used to identify the direction of anisotropy in TMTCs and reveal their vibrational characteristics which are necessary to gain insight into potential applications that utilize direction dependent thermal response, optical polarization, and linear dichroism.
ISSN: 2040-3364
Appears in Collections:Photonics / Fotonik
Physics / Fizik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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