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



Christopher D. Zangmeister, Roger D. van Zee, Steven W. Robey, N E. Gruhn, Yuxing Yao, J M. Tour


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.
Journal of Physical Chemistry


energy-level alignment, gold, monolayer, oligo(phenylene-ethynylene, photoemission, UPS


Zangmeister, C. , van, R. , Robey, S. , Gruhn, N. , Yao, Y. and Tour, J. (2008), Ultraviolet Photoemission Spectra of Para-Phenylene-Ethynylene Thiols Chemisorbed on Gold, Journal of Physical Chemistry (Accessed February 21, 2024)
Created January 1, 2008, Updated February 19, 2017