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Adsorption of substituted pyrrolidone molecules on Au(111): an STM and XPS study

โœ Scribed by J. Charlier; J. Cousty; Z. X. Xie; C. Vasset-Le Poulennec; C. Bureau

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
430 KB
Volume
30
Category
Article
ISSN
0142-2421

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โœฆ Synopsis

The adsorption of several molecules with a pyrrolidone ring (triacontane-pyrrolidone (NTP), 2-pyrrolidone (Py) and methyl-2-pyrrolidone (Mpy)) on an Au(111) surface has been studied by scanning tunnelling microscopy (STM) and by XPS. Self-assembled monolayers have been observed only for NTP and Py molecules, whereas STM images show a disordered Mpy overlayer. The XPS measurements on Py and Mpy monolayers reveal that the nitrogen atom of the pyrrolidone group is involved in different chemical bonds, depending on the molecule. Considering both STM and XPS data, models of molecule packing are proposed. Finally, tacking advantage of the different locations of the pyrrolidone function in these monolayers, we discuss the parameters that govern the presence of the pyrrolidone group in STM images.

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