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A coverage dependent study of the adsorption of pyridine on the (111) coinage metal surfaces

Journal Article · · Surface Science
 [1];  [2]
  1. University of Central Florida, Orlando, FL (United States); OSTI
  2. University of Central Florida, Orlando, FL (United States)

Using density functional theory we explore the adsorption of pyridine (NC5H5) on Cu, Ag, and Au(111) surfaces. To study the effect of coverage we run calculations on a 3 × 4 (12 atom), 4 × 4 (16 atom), 5 × 4 (20 atom), and 4 × 6 (24 atom) surface. To examine the role of the van der Waals interaction we use the following vdW inclusive functionals: optB86-vdW, optB88-vdW, optPBE-vdW, revPBE-vdW, rPW86-vdW2, SCAN+rVV10 along with the PBE functional. Regardless of functional, metal, and coverage we find the most energetically stable adsorption site to be a vertical site with the pyridine's N atom directly above a metal atom, which contradicts the available experimental literature. Introducing the vdW interaction lowers the energy gap between the most energetically favorable flat and vertical adsorption configurations. Moving to a higher coverage increases the overall interaction of the pyridine molecule with the surface. We also find that the SCAN+rVV10 functional performs similarly to the optB86b-vdW and optB88-vdW functional. Along with the geometric properties of the substrate/adsorbate system, here we report several electronic properties of the substrate/adsorbate system such as charge transfer from the surface to the molecule, change in the surface's work function, and change in d-band of the atoms in the first layer of the substrate.

Research Organization:
University of Central Florida, Orlando, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0007045; SC0007045
OSTI ID:
1801753
Alternate ID(s):
OSTI ID: 1776223
Journal Information:
Surface Science, Journal Name: Surface Science Journal Issue: C Vol. 693; ISSN 0039-6028
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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