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| Home > Publications database > Adsorption of 3,4,9,10-Perylenetetracarboxylic Acid Dianhydride on the Cu 3 Au(111) Surface Studied by Normal-Incidence X-ray Standing Waves |
| Home > Publications database > Adsorption of 3,4,9,10-Perylenetetracarboxylic Acid Dianhydride on the Cu 3 Au(111) Surface Studied by Normal-Incidence X-ray Standing Waves |
| Journal Article | FZJ-2018-03150 |
; ; ; ; ; ;
2018
Soc.
Washington, DC
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Please use a persistent id in citations: doi:10.1021/acs.jpcc.8b02269
Abstract: We report on the structure formation and the adsorption height of the organic semiconductor molecule 3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA) on the Cu3Au(111) surface. The results are based on a detailed analysis of the vertical positions of the carbon and oxygen atoms of PTCDA versus the topmost layer of the Cu3Au surface by the normal-incidence X-ray standing wave (NIXSW) technique. The oxygen atoms are found to be located at a larger vertical height than the perylene core, and thus the molecule exhibits a boat-like distortion. The van der Waals radii corrected adsorption height of the perylene core follows the trend with the work function, which was found for PTCDA on the (111) surfaces of the pure coinage metals. In addition, changes related to the exposure to synchrotron radiation are reported. We find an increase in Cu and a reduction of the Au enrichment of the as-prepared Cu3Au(111) surface, while the adsorption height of the PTCDA decreases, indicating an X-ray beam-induced transition to a second stronger bonded state of the PTCDA.
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