In<sub><em>x</em></sub>Ga<sub>1?<em>x</em></sub>As Nanowire Growth on Graphene [electronic resource] : van der Waals Epitaxy Induced Phase Segregation.
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2013.
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| Abstract: | The growth of high-density arrays of vertically oriented, single crystalline InAs NWs on graphene surfaces are realized through the van der Waals (vdW) epitaxy mechanism by metalorganic chemical vapor deposition (MOCVD). However, the growth of InGaAs NWs on graphene results in spontaneous phase separation starting from the beginning of growth, yielding a well-defined InAs?In<sub>x</sub>Ga<sub>1?x</sub>As (0.2 < x < 1) core?shell structure. The core?shell structure then terminates abruptly after about 2 ?m in height, and axial growth of uniform composition In<sub>x</sub>Ga<sub>1?x</sub>As takes place without a change in the NW diameter. The In<sub>x</sub>Ga<sub>1?x</sub>As shell composition changes as a function of indium flow, but the core and shell thicknesses and the onset of nonsegregated In<sub>x</sub>Ga<sub>1?x</sub>As axial segment are independent of indium composition. In contrast, no InGaAs phase segregation has been observed when growing on MoS<sub>2</sub>, another two-dimensional (2D) layered material, or via the Au-assisted vapor?liquid?solid (VLS) mechanism on graphene. This spontaneous phase segregation phenomenon is elucidated as a special case of van der Waals epitaxy on 2D sheets. Here, considering the near lattice matched registry between InAs and graphene, InGaAs is forced to self-organize into InAs core and InGaAs shell segments since the lack of dangling bonds on graphene does not allow strain sharing through elastic deformation between InGaAs and graphene. |
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| Item Description: | Published through Scitech Connect. 02/19/2013. "Journal ID: ISSN 1530-6984." Mohseni, Parsian K. ; Behnam, Ashkan ; Wood, Joshua D. ; English, Christopher D. ; Lyding, Joseph W. ; Pop, Eric ; Li, Xiuling ; Univ. of Illinois at Urbana-Champaign, IL (United States) US Air Force Office of Scientific Research (AFOSR) |
| Physical Description: | Size: p. 1153-1161 : digital, PDF file. |