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• W1998315246 startingPage "024702" @default.
• W1998315246 abstract "The nature of the chemical bonding of a pentacene molecule to a gold surface is studied. The calculations are carried out using two very different methodologies, the ab inito gaussian molecular orbital method and a numerical atomic orbital method, developed from the well tested SIESTA approach. Using the GAUSSIAN 09 package, we employ both local density B3LYP, and long-range correlated functionals CAM-B3LYP, ωB97, and ωB97X. For comparison, we also calculate the adsorption energy using the ATOMISTIX TOOLKIT with the revised PBE functional. Within computational and experimental errors we find that the best description of the binding energies can be obtained from GAUSSIAN calculations using long-range ωB97 and ωB97X exchange functionals. Thus the nature of chemical bonding of a pentacene to gold is a van der Waals type. To understand the large variation in the geometries computed by different methods, we calculate energy profiles in both X- and Y-directions. The energy barriers appear to be very small and comparable with the value of room temperature. Thus a pentacene molecule moves on a gold surface with almost no friction at room temperatures. An estimation of the work function is often obtained from a simple electrostatic approach. We test this estimation and find that this approach cannot be used because it significantly underestimates the work function. This investigation gives insights into the structure and bonding of pentacene to a gold surface and provides ideas for the improvement of methodologies for computing the properties of van der Waals adsorbates." @default.
• W1998315246 created "2016-06-24" @default.
• W1998315246 creator A5032961936 @default.
• W1998315246 creator A5074116690 @default.
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• W1998315246 date "2011-07-14" @default.
• W1998315246 modified "2023-09-23" @default.
• W1998315246 title "The adsorption energy and diffusion of a pentacene molecule on a gold surface" @default.
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• W1998315246 doi "https://doi.org/10.1063/1.3599088" @default.
• W1998315246 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21766964" @default.
• W1998315246 hasPublicationYear "2011" @default.
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