Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session P52: Focus Topic: Surface, Interface, and Thin Film Science of Organic Molecular Solids II
2:30 PM–5:18 PM,
Wednesday, March 4, 2020
Room: Mile High Ballroom 1E
Sponsoring
Unit:
DMP
Chair: Jeffrey Guest, Argonne Natl Lab
Abstract: P52.00009 : Controlling energy level alignment at a chromophore/TiO2 interface using a co-adsorbed helical peptide*
View Presentation
Abstract
Presenter:
Jonathan Viereck
(Physics and Astronomy, Rutgers University)
Authors:
Jonathan Viereck
(Physics and Astronomy, Rutgers University)
Yuan Chen
(Chemistry, Rutgers University - Newark)
Ryan Harmer
(Chemistry, Rutgers University - Newark)
Elena Galoppini
(Chemistry, Rutgers University - Newark)
Sylvie Rangan
(Physics and Astronomy, Rutgers University)
Robert Allen Bartynski
(Physics and Astronomy, Rutgers University)
Here, we present a novel and versatile approach of controlling this energy alignment via a “mixed-layer” solution sensitization process, where a monolayer of a dipole containing helical peptide is prepared on a single crystal TiO2(110) surface and successively exposed to a solution of a Zinc Tetraphenylporphyrin (ZnTPP) derivative. Using UV and X-ray photoemission spectroscopies, we find that (1) repeated exposure to the ZnTPP derivative progressively displaces the peptides on the surface, and (2) the highest occupied molecular orbital and N 1s core level of the ZnTPP derivative within the mixed layer are located 300 meV lower in energy than their respective counterparts on a pure ZnTPP-derivative monolayer. These results are consistent with a simple parallel plate capacitor model of the intermixed peptide dipole layer.
*The authors acknowledge funding from DOE-FG02-01ER15256.
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