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  • Hulva, JanTechnical University Vienna (TU Wien) (author)

Adsorption of CO on the Fe3O4(001) Surface

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2017-09-22
  • American Chemical Society (ACS),2018
  • 9 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:d84cc588-0241-48f5-ad16-dd15579ae3df
  • https://lup.lub.lu.se/record/d84cc588-0241-48f5-ad16-dd15579ae3dfURI
  • https://doi.org/10.1021/acs.jpcb.7b06349DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • The interaction of CO with the Fe3O4(001)-(√2 × √2)R45° surface was studied using temperature-programmed desorption (TPD), scanning tunneling microscopy (STM), and X-ray photoelectron spectroscopy (XPS), the latter both under ultrahigh vacuum (UHV) conditions and in CO pressures up to 1 mbar. In general, the CO-Fe3O4 interaction is found to be weak. The strongest adsorption occurs at surface defects, leading to small TPD peaks at 115, 130, and 190 K. Desorption from the regular surface occurs in two distinct regimes. For coverages up to two CO molecules per (√2 × √2)R45° unit cell, the desorption maximum shows a large shift with increasing coverage, from initially 105 to 70 K. For coverages between 2 and 4 molecules per (√2 × √2)R45° unit cell, a much sharper desorption feature emerges at ∼65 K. Thermodynamic analysis of the TPD data suggests a phase transition from a dilute 2D gas into an ordered overlayer with CO molecules bound to surface Fe3+ sites. XPS data acquired at 45 K in UHV are consistent with physisorption. Some carbon-containing species are observed in the near-ambient-pressure XPS experiments at room temperature but are attributed to contamination and/or reaction with CO with water from the residual gas. No evidence was found for surface reduction or carburization by CO molecules.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Jakub, ZdeněkTechnical University Vienna (TU Wien) (author)
  • Novotny, ZbynekTechnical University Vienna (TU Wien) (author)
  • Johansson, NiclasLund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-naj (author)
  • Knudsen, JanLund University,Lunds universitet,MAX IV-laboratoriet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,MAX IV Laboratory,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-jks (author)
  • Schnadt, JoachimLund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-jst (author)
  • Schmid, MichaelTechnical University Vienna (TU Wien) (author)
  • Diebold, UlrikeTechnical University Vienna (TU Wien) (author)
  • Parkinson, Gareth S.Technical University Vienna (TU Wien) (author)
  • Technical University Vienna (TU Wien)Synkrotronljusfysik (creator_code:org_t)

Related titles

  • In:Journal of Physical Chemistry B: American Chemical Society (ACS)122:2, s. 721-7291520-61061520-5207

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