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Growth of Highly Oriented (VNbMoTaW)S2 Layers.
Tanaka, Koichi; Zaid, Hicham; Aoki, Toshihiro; Deshpande, Aditya; Hojo, Koki; Ciobanu, Cristian V; Kodambaka, Suneel.
Affiliation
  • Tanaka K; Department of Materials Science and Engineering, University of California, Los Angeles, 410 Westwood Plaza, Los Angeles, California 90095, United States.
  • Zaid H; Department of Materials Science and Engineering, University of California, Los Angeles, 410 Westwood Plaza, Los Angeles, California 90095, United States.
  • Aoki T; Irvine Materials Research Institute (IMRI), University of California, Irvine, 644 Engineering Tower, Irvine, California 92697, United States.
  • Deshpande A; Department of Materials Science and Engineering, University of California, Los Angeles, 410 Westwood Plaza, Los Angeles, California 90095, United States.
  • Hojo K; Graduate Department of Micro-Nano Mechanical Science and Engineering, Nagoya University, Furo-cho, Nagoya 464-8601, Japan.
  • Ciobanu CV; Department of Mechanical Engineering and Materials Science Program, Colorado School of Mines, Golden, Colorado 80401, United States.
  • Kodambaka S; Department of Materials Science and Engineering, University of California, Los Angeles, 410 Westwood Plaza, Los Angeles, California 90095, United States.
Nano Lett ; 24(1): 493-500, 2024 Jan 10.
Article in En | MEDLINE | ID: mdl-38148179
ABSTRACT
Compositional tunability, an indispensable parameter for modifying the properties of materials, can open up new applications for van der Waals (vdW) layered materials such as transition-metal dichalcogenides (TMDCs). To date, multielement alloy TMDC layers are obtained via exfoliation from bulk polycrystalline powders. Here, we demonstrate direct deposition of high-entropy alloy disulfide, (VNbMoTaW)S2, layers with controllable thicknesses on free-standing graphene membranes and on bare and hBN-covered Al2O3(0001) substrates via ultra-high-vacuum reactive dc magnetron sputtering of the VNbMoTaW target in Kr and H2S gas mixtures. Using a combination of density functional theory calculations, Raman spectroscopy, X-ray diffraction, scanning transmission electron microscopy coupled with energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy, we determine that the as-deposited layers are single-phase, 2H-structured, and 0001-oriented (V0.10Nb0.16Mo0.19Ta0.28W0.27)S2.44. Our synthesis route is general and applicable for heteroepitaxial growth of a wide variety of TMDC alloys and potentially other multielement alloy vdW compounds with the desired compositions.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nano Lett Year: 2024 Type: Article Affiliation country: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Nano Lett Year: 2024 Type: Article Affiliation country: United States