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Local optoelectronic properties of zinc-porphyrin/gold molecular interfaces.
- Format:
- Book
- Thesis/Dissertation
- Author/Creator:
- Chen, Xi, author.
- Language:
- English
- Subjects (All):
- Molecular physics.
- Nanoscience.
- Nanotechnology.
- Materials Science and Engineering--Penn dissertations.
- Penn dissertations--Materials Science and Engineering.
- Local Subjects:
- Molecular physics.
- Nanoscience.
- Nanotechnology.
- Materials Science and Engineering--Penn dissertations.
- Penn dissertations--Materials Science and Engineering.
- Genre:
- Academic theses.
- Physical Description:
- 1 online resource (130 pages)
- Contained In:
- Dissertation Abstracts International 76-05B(E).
- Place of Publication:
- [Philadelphia, Pennsylvania] : University of Pennsylvania ; Ann Arbor, MI : ProQuest, 2014.
- System Details:
- Mode of access: World Wide Web.
- text file
- Summary:
- This research consists in designing a series of experiments to determine the molecular orbital energy levels of zinc-porphyrin molecule when vertically attached to Au(111) substrate. To study the zinc-porphyrine molecular orbitals we use visible light of different wavelengths. Thiolated zinc-porphyrin oligomer molecules link to Au(111) surface, embedded within an 1-octanethiol self-assembled monolayer. Current-Voltage characterization technique allow us to determine the electronic orbital structures of different zinc-porphyrin oligomer single molecules via scanning tunneling microscope. Coupling lasers of different wavelengths and the tunneling junction, illumination effect on the molecular orbital energy levels of zinc-porphyrin molecules is investigated. The results indicate that the experimental zinc-porphyrin orbital energy levels are qualitatively consistent with previous calculations and experiments of similar porphyrin molecules. With illumination at given wavelengths, HOMO-LUMO gaps decreases for zinc-porphyrin molecules, and under dark condition the dimer zinc-porphyrin molecule shows a larger HOMO-LUMO gap than the monomer counterpart. We propose a charged molecule model to explain the light illumination effect, and we attribute the larger HOMO-LUMO gap in dimer molecule to a mixing of face-to-face bundling and tilting of the molecules.
- Notes:
- Source: Dissertation Abstracts International, Volume: 76-05(E), Section: B.
- Adviser: Dawn A. Bonnell.
- Department: Materials Science and Engineering.
- Thesis Ph.D. University of Pennsylvania 2014.
- Local Notes:
- School code: 0175.
- ISBN:
- 9781321479294
- Access Restriction:
- Restricted for use by site license.
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