Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

The structure of 2D charge transfer salts formed by TCNQ/alkali metal coadsorption on Ag(111)

Tools
- Tools
+ Tools

Blowey, Phil J., Rochford, L. A., Duncan, D. A., Ryan, P. T. P., Warr, Daniel, Lee, T-L., Costantini, G. and Woodruff, D. P. (2020) The structure of 2D charge transfer salts formed by TCNQ/alkali metal coadsorption on Ag(111). Surface Science, 701 . 121687. doi:10.1016/j.susc.2020.121687

[img] PDF
WRAP-Structure-2D-charge-salts-metal-Woodruff-2020.pdf - Accepted Version
Embargoed item. Restricted access to Repository staff only until 10 July 2021. Contact author directly, specifying your specific needs. - Requires a PDF viewer.
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

Download (897Kb)
Official URL: http://dx.doi.org/10.1016/j.susc.2020.121687

Request Changes to record.

Abstract

The structure of coadsorption phases formed on Ag(111) by TCNQ (7,7,8,8-tetracyanoquinodimethane) with Cs are compared with previously reported coadsorption phases formed with K, following investigation by scanning tunnelling microscopy (STM), low energy electron diffraction, soft X-ray photoelectrons spectroscopy and normal incidence X-ray standing waves (NIXSW). For each alkali we identify two ordered phases, one with an alkali: TCNQ stoichiometry of 1:1 and the other 2:1. STM images show the molecular organisation is the same for Cs and K, although only the K2TCNQ phase is commensurate with the substrate. A previously-published detailed structure determination of the K2TCNQ phase, complemented by density function theory calculations that identify bonding strengths, showed that the binding within the layer is much stronger than that of the layer to the substrate. Insensitivity to commensuration is thus to be expected. The situation for KTCNQ and CsTCNQ is less clear; these ordered incommensurate overlayers clearly have strong intralayer bonding, but the relative strength of the average overlayer-substrate bonding is unknown. NIXSW data show that the alkalis in these phases occupy adsorption sites far more distant from the substrate than the TCNQ molecules when compared to the near coplanar alkali-TCNQ geometry of K2TCNQ and Cs2TCNQ. Ultraviolet photoelectron spectra show increasing bonding shifts of TCNQ orbital states with alkali coverage.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Chemistry
Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Solid state physics, Metals -- Surfaces, Organic conductors, Oxidation-reduction reaction, Charge transfer
Journal or Publication Title: Surface Science
Publisher: Elsevier BV
ISSN: 0039-6028
Official Date: November 2020
Dates:
DateEvent
November 2020Published
10 July 2020Available
9 July 2020Accepted
Date of first compliant deposit: 29 October 2020
Volume: 701
Article Number: 121687
DOI: 10.1016/j.susc.2020.121687
Status: Peer Reviewed
Publication Status: Published
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
308115European Research Councilhttp://dx.doi.org/10.13039/501100000781

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item
twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us