Materials Synthesis, Deposition, and Processing

Functional two/three-dimensional assembly of monolayer WS2 and nickel oxide

[+] Author Affiliations
Christopher B. Jacobs, Kai Wang, Anton V. Ievlev, Liam Collins, Eric S. Muckley, Ilia N. Ivanov

Center for Nanophase Materials Science and Institute for Functional Imaging of Materials, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States

J. Photon. Energy. 7(1), 014001 (Mar 21, 2017). doi:10.1117/1.JPE.7.014001
History: Received September 8, 2016; Accepted March 6, 2017
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Abstract.  Functional assemblies of materials can be realized by tuning the work function and band gap of existing materials. Here we demonstrate the structural assembly of two- and three-dimensional (2-D) and (3-D) nanomaterials and investigate the optical and electronic properties of an assembly of monolayer WS2 on a rough polycrystalline NiO surface. Monolayer WS2 (2-D material) was transferred onto the NiO surface using a polymer-assisted transfer technique and resulted in a surface roughness about 30× greater than that of WS2 on SiO2. Raman maps of WS2 transferred onto NiO display a spatial nonuniformity of the E2g1 (352  cm1) and A1g (418  cm1) peak intensities, indicating that regions of the WS2 exist in a strained condition on the 3-D NiO surface. Kelvin probe force microscopy measurements show that the WS2-SiO2 assembly has a surface potential 62±5  mV lower than that of SiO2, whereas that of WS2-NiO is 11±5  mV higher than NiO, indicating that a monolayer of WS2 is sufficient to modify the surface potential by acting as either an electron donor or acceptor with the underlying surface. Thus, 2-D and 3-D materials can be organized into functional assemblies with electron flow controlled by the WS2 either as the electron donor or acceptor.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Christopher B. Jacobs ; Kai Wang ; Anton V. Ievlev ; Liam Collins ; Eric S. Muckley, et al.
"Functional two/three-dimensional assembly of monolayer WS2 and nickel oxide", J. Photon. Energy. 7(1), 014001 (Mar 21, 2017). ; http://dx.doi.org/10.1117/1.JPE.7.014001


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