Luminescence-based assessment of thermodynamic constants for electrostatic binding of non-luminescent dyes and atomic ions to colloidal semiconductor surfaces

Xiaojun Dang, Joseph T Hupp

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Steady-state and time-resolved luminescence experiments were employed to study the electrostatic interaction of cationic photosensitizers and negatively charged colloidal semiconductor particles. Electrostatic adsorption of efficient photosensitizers on semiconductor surfaces is known to quench the photosensitizers' luminescence. By monitoring the quenching, either directly or competitively, thermodynamic constants for binding of both luminescent and non-luminescent ruthenium and osmium complexes to negatively charged SnO2 particle have been determined. The function of atomic cations, such as Li+, Na+ and K+, in controlling the binding of cationic dyes to colloidal SnO2 has also been studied via competitive luminescence. From the study, semiconductor surface binding constants for these species have also been determined.

Original languageEnglish
Pages (from-to)251-256
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume143
Issue number2-3
Publication statusPublished - Oct 10 2001

Fingerprint

Photosensitizing Agents
Photosensitizers
Luminescence
Electrostatics
Coloring Agents
Dyes
dyes
Thermodynamics
Ions
luminescence
electrostatics
Semiconductor materials
thermodynamics
Osmium
ions
Ruthenium
osmium
Charged particles
Coulomb interactions
ruthenium

Keywords

  • Binding constant
  • Electrostatic binding
  • Semiconductor surface

ASJC Scopus subject areas

  • Bioengineering
  • Physical and Theoretical Chemistry

Cite this

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AB - Steady-state and time-resolved luminescence experiments were employed to study the electrostatic interaction of cationic photosensitizers and negatively charged colloidal semiconductor particles. Electrostatic adsorption of efficient photosensitizers on semiconductor surfaces is known to quench the photosensitizers' luminescence. By monitoring the quenching, either directly or competitively, thermodynamic constants for binding of both luminescent and non-luminescent ruthenium and osmium complexes to negatively charged SnO2 particle have been determined. The function of atomic cations, such as Li+, Na+ and K+, in controlling the binding of cationic dyes to colloidal SnO2 has also been studied via competitive luminescence. From the study, semiconductor surface binding constants for these species have also been determined.

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