Electron injection dynamics from photoexcited porphyrin dyes into SnO 2 and TiO2 nanoparticles

Rebecca L. Milot, Gary F. Moore, Robert H. Crabtree, Gary W Brudvig, Charles A. Schmuttenmaer

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

The photoexcited electron injection dynamics of free-base and metallo-derivatives of tris(pentafluorophenyl)porphyrins bound to TiO 2 and SnO2 nanoparticle surfaces have been investigated using time-resolved terahertz spectroscopy (TRTS). The metallo-derivatives include Zn(II), Cu(II), Ni(II), and Pd(II). For the TiO2-porphyrin assemblies, electron injection from the photoexcited dye to the semiconductor occurs only when using the zinc derivative as the sensitizer because it is the only dye studied in this report with long-lived excited states higher in energy than the TiO2 conduction band edge. All of the dyes, however, have excited-state energies above the SnO2 conduction band edge, and the electron injection rates vary widely from 0.4 to 200 ps depending on the sensitizer. For the SnO2-porphyrin assemblies, electron injection is strongly influenced by competition with alternate deactivation routes that are accessible following Soret band excitation. These results offer thermodynamic and kinetic considerations for designing improved high-potential porphyrin photoanodes with applications to solar-powered water oxidation.

Original languageEnglish
Pages (from-to)21662-21670
Number of pages9
JournalJournal of Physical Chemistry C
Volume117
Issue number42
DOIs
Publication statusPublished - 2013

Fingerprint

Electron injection
Porphyrins
porphyrins
Coloring Agents
Dyes
dyes
injection
Nanoparticles
nanoparticles
Derivatives
Conduction bands
Excited states
assemblies
conduction bands
electrons
Terahertz spectroscopy
excitation
deactivation
Zinc
zinc

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Electron injection dynamics from photoexcited porphyrin dyes into SnO 2 and TiO2 nanoparticles. / Milot, Rebecca L.; Moore, Gary F.; Crabtree, Robert H.; Brudvig, Gary W; Schmuttenmaer, Charles A.

In: Journal of Physical Chemistry C, Vol. 117, No. 42, 2013, p. 21662-21670.

Research output: Contribution to journalArticle

Milot, Rebecca L. ; Moore, Gary F. ; Crabtree, Robert H. ; Brudvig, Gary W ; Schmuttenmaer, Charles A. / Electron injection dynamics from photoexcited porphyrin dyes into SnO 2 and TiO2 nanoparticles. In: Journal of Physical Chemistry C. 2013 ; Vol. 117, No. 42. pp. 21662-21670.
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