Synthesis of Semiconducting 2H-Phase WTe2 Nanosheets with Large Positive Magnetoresistance
Tungsten ditelluride (WTe2) is provoking immense interest because of its unique electronic properties, but studies about its semiconducting hexagonal (2H) phase are quite rare. Herein, we report the synthesis of semiconducting 2H WTe2 nanosheets with large positive magnetoresistance, for the first t...
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Published in | Inorganic chemistry Vol. 59; no. 17; pp. 11935 - 11939 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
08.09.2020
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Abstract | Tungsten ditelluride (WTe2) is provoking immense interest because of its unique electronic properties, but studies about its semiconducting hexagonal (2H) phase are quite rare. Herein, we report the synthesis of semiconducting 2H WTe2 nanosheets with large positive magnetoresistance, for the first time, by a simple lithium-intercalation-assisted exfoliation strategy. Systematic characterizations including high-resolution transmission electron microscopy, X-ray diffraction, and Raman and X-ray photoelectron spectroscopies provide clear evidence to distinguish the structure of 2H WTe2 nanosheets from the orthorhombic (Td) phase bulk counterpart. The corresponding electronic phase transition from metal to semiconductor is also confirmed by density of states calculation, optical absorption, and electrical transport property measurements. Besides, the 2H WTe2 nanosheets exhibit large positive magnetoresistance with values of up to 29.5% (10 K) and 16.2% (300 K) at 9 T. Overall, these findings open up a promising avenue into the exploration of WTe2-based materials in the semiconductor field. |
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AbstractList | Tungsten ditelluride (WTe2) is provoking immense interest because of its unique electronic properties, but studies about its semiconducting hexagonal (2H) phase are quite rare. Herein, we report the synthesis of semiconducting 2H WTe2 nanosheets with large positive magnetoresistance, for the first time, by a simple lithium-intercalation-assisted exfoliation strategy. Systematic characterizations including high-resolution transmission electron microscopy, X-ray diffraction, and Raman and X-ray photoelectron spectroscopies provide clear evidence to distinguish the structure of 2H WTe2 nanosheets from the orthorhombic (Td) phase bulk counterpart. The corresponding electronic phase transition from metal to semiconductor is also confirmed by density of states calculation, optical absorption, and electrical transport property measurements. Besides, the 2H WTe2 nanosheets exhibit large positive magnetoresistance with values of up to 29.5% (10 K) and 16.2% (300 K) at 9 T. Overall, these findings open up a promising avenue into the exploration of WTe2-based materials in the semiconductor field. |
Author | Xie, Jun-feng Li, Dong-sheng Li, Shuang Peng, Xu Wu, Ya-pan Wang, Ruo-qi Lei, Feng-cai |
AuthorAffiliation | Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering College of Chemistry and Chemical Engineering College of Chemistry, Chemical Engineering and Materials Science |
AuthorAffiliation_xml | – name: Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering – name: College of Chemistry and Chemical Engineering – name: College of Chemistry, Chemical Engineering and Materials Science |
Author_xml | – sequence: 1 givenname: Shuang surname: Li fullname: Li, Shuang email: lishmail@126.com organization: Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering – sequence: 2 givenname: Feng-cai orcidid: 0000-0002-6207-7164 surname: Lei fullname: Lei, Feng-cai organization: College of Chemistry, Chemical Engineering and Materials Science – sequence: 3 givenname: Xu orcidid: 0000-0001-9502-6382 surname: Peng fullname: Peng, Xu organization: College of Chemistry and Chemical Engineering – sequence: 4 givenname: Ruo-qi surname: Wang fullname: Wang, Ruo-qi organization: Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering – sequence: 5 givenname: Jun-feng orcidid: 0000-0002-5775-3084 surname: Xie fullname: Xie, Jun-feng organization: College of Chemistry, Chemical Engineering and Materials Science – sequence: 6 givenname: Ya-pan orcidid: 0000-0003-4551-0998 surname: Wu fullname: Wu, Ya-pan organization: Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering – sequence: 7 givenname: Dong-sheng orcidid: 0000-0003-1283-6334 surname: Li fullname: Li, Dong-sheng email: lidongsheng1@126.com organization: Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, College of Materials and Chemical Engineering |
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Title | Synthesis of Semiconducting 2H-Phase WTe2 Nanosheets with Large Positive Magnetoresistance |
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