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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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Official URL: http://dx.doi.org/10.1103/PhysRevMaterials.3.11600...

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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
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Q Science > QH Natural history
Divisions: Faculty of Science > Chemistry
Faculty of Science > Physics
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
Dates:
DateEvent
5 November 2019Published
23 October 2019Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDDiamond Light Sourcehttp://dx.doi.org/10.13039/100011889
UNSPECIFIED[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
1083[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
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