Interfacial Effects of the Photophysics of Rhodamine 6G Ultra-Thin Films on a Poly(methylmethacrylate) Surface

The absorbance, excitation, and emission spectra of ultra-thin films of rhodamine 6G (Rh6G) spin-cast on poly­(methylmethacrylate) (PMMA)-coated glass slides are examined as a function of both PMMA and Rh6G thickness. The thickness of PMMA has a little effect on the absorption or emission properties...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physical chemistry. C 2022-05, Vol.126 (20), p.8938-8946
Main Authors: Chapman, Mingyu, Chapman, Navid, Euler, William B.
Format: Article
Language:English
Subjects:
C: Physical Properties of Materials and Interfaces
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The absorbance, excitation, and emission spectra of ultra-thin films of rhodamine 6G (Rh6G) spin-cast on poly­(methylmethacrylate) (PMMA)-coated glass slides are examined as a function of both PMMA and Rh6G thickness. The thickness of PMMA has a little effect on the absorption or emission properties of Rh6G. At low surface coverage, the spectral properties of Rh6G are dominated by isolated molecules. As the Rh6G thickness increases, there is no evidence for exciton formation. Instead, the Rh6G molecules aggregate, which is responsible for the observed absorption and emission spectra. The aggregates significantly quench the emission so that the maximum emission intensity is found just below a monolayer surface coverage. The lack of exciton formation, which is unexpected, is attributed to the surface morphology of PMMA, which has a periodic surface structure.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.2c02258