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Publication Citation: Ultraviolet Photoemission Spectra of Para-Phenylene-Ethynylene Thiols Chemisorbed on Gold

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Author(s): Christopher D. Zangmeister; Roger D. van Zee; Steven W. Robey; N E. Gruhn; Yuxing Yao; J M. Tour;
Title: Ultraviolet Photoemission Spectra of Para-Phenylene-Ethynylene Thiols Chemisorbed on Gold
Published: January 01, 0008
Abstract: Photoemission spectra of para-phenylene-ethynylene thiols chemisorbed on gold have been measured. Four compounds were studied: 4,4'-bis(phenylethynyl)-benzenethiol, 4 (phenylethynyl)benzenethiol, 4-ethynylbenzenethiol, and benzenethiol. The spectra were used to determine the work function of the monolayer-covered surface and energy alignment of the highest occupied p state of the monolayer relative to the Fermi level of the substrate. The vacuum level of the monolayer-covered surface is shifted relative to that of the bare substrate by about -0.9 eV. The shift is attributed to changes in the charge distribution at the interface that occur upon chemisorption.
Citation: Journal of Physical Chemistry
Keywords: energy-level alignment;gold;monolayer;oligo(phenylene-ethynylene;photoemission;UPS
Research Areas: Nanomaterials, Nanoelectronics and Nanoscale Electronics, Chemical Physics