A van der Waals density functional investigation of carboranethiol self-assembled monolayers on Au(111)

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Mete E., YILMAZ A., DANIŞMAN M. F.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, cilt.18, sa.18, ss.12920-12927, 2016 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 18 Sayı: 18
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1039/c6cp01485b
  • Dergi Adı: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.12920-12927
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Isolated and full monolayer adsorption of various carboranethiol (C2B10H12S) isomers on the gold(111) surface has been investigated using both the standard and van der Waals density functional theory calculations. The effect of different molecular dipole moment orientations on the low energy adlayer geometries, the binding characteristics and the electronic properties of the self-assembled monolayers of these isomers has been studied. Specifically, the binding energy and work function changes associated with different molecules show a correlation with their dipole moments. The adsorption is favored for the isomers with dipole moments parallel to the surface. Of the two possible unit cell structures, (5 x 5) was found to be more stable than (root 19 x root 19) R23.4 degrees.