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Characterisation of growth & structure of TCNQ phases on Ag(111)
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Blowey, Phil J., Haags, A., Rochford, L. A., Felter, J., Warr, Daniel, Duncan, D. A., Lee, T. -L., Costantini, G., Kumpf, C. and Woodruff, D. P. (2019) Characterisation of growth & structure of TCNQ phases on Ag(111). Physical Review Materials, 3 . 116001. doi:10.1103/PhysRevMaterials.3.116001
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WRAP-characterisation-growth-structure-TCNQ-phases-Ag(111)-Woodruff-2019.pdf - Accepted Version - Requires a PDF viewer. Download (1176Kb) | Preview |
Official URL: http://dx.doi.org/10.1103/PhysRevMaterials.3.11600...
Abstract
A combination of scanning tunneling microscopy, low-energy electron diffraction,and low-energy electron microscopy (LEEM) has been used to identify the structural phases formed by 7,7,8,8-tetracyanoquinodimethane (TCNQ) on Ag(111). These comprise a two-dimensional gas phase, a low-density commensurate (LDC) phase, and a higher-density incommensurate (HDI) phase. LEEM also shows the presence of an additional “precursor-HDI” phase with a surface unit mesh area only ≈3% less than the HDI phase. Normal incidence x-ray standing-wave measurements of the HDI phase yield almost identical structural parameters to the LDC phase for which a full structure determination has been previously reported. The results show TCNQ does not adopt the inverted bowl distortion favored in earlier density functional theory calculations of TCNQ on coinage metal surfaces, but the N atoms are twisted out of the molecular plane, an effect found for the LDC phase to be due to incorporation of Ag adatoms. The possible role of Ag adatoms in the HDI phase, and in the transition from the precursor-HDI phase, is discussed.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry Q Science > QH Natural history |
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| Divisions: | Faculty of Science > Chemistry Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Scanning tunneling microscopy, Low energy electron diffraction , Electron microscopy | ||||||||||||
| Journal or Publication Title: | Physical Review Materials | ||||||||||||
| Publisher: | American Physical Society | ||||||||||||
| ISSN: | 2475-9953 | ||||||||||||
| Official Date: | 5 November 2019 | ||||||||||||
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| Volume: | 3 | ||||||||||||
| Article Number: | 116001 | ||||||||||||
| DOI: | 10.1103/PhysRevMaterials.3.116001 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Publisher Statement: | © 2019 American Physical Society | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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