| 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 |
