Dye sensitization with octasubstituted liquid crystalline phthalocyanines

L. K. Chau, E. J. Osburn, Neal R Armstrong, D. F. O'Brien, B. A. Parkinson

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

New liquid crystalline octaamide (C12) and octaester (C12) copper phthalocyanines (LC-Pc), which form self-assembled structures in solutions and in cast films, act as effective sensitizers for the photoelectrochemical response of the layered semiconductors, n-SnS2. The photocurrent yield spectra of these cast films, at a wide range of coverages, show a single sharp Q-band at a position corresponding to close packed monolayer assemblies of flat-lying Pc's. Quantum yields per absorbed photon are high (QYAP ≈ 44%) for the close packed monolayers. In contrast, films from a short-chain substituted and an unsubstituted CuPc on SnS2 show Q-band photocurrent yield spectra due to both the monomer and H-aggregate forms. These phenomena suggest that the efficiency of exciton transport through a self-assembled LC-Pc film strongly depends on the separation distance between the chromophores. The interfacial structure of the mesogenic molecules at the semiconductor or metal surface appears to be critical in determining the overall exciton transport efficiency in columnar mesophases.

Original languageEnglish (US)
Pages (from-to)351-353
Number of pages3
JournalLangmuir
Volume10
Issue number2
StatePublished - Feb 1994

Fingerprint

Coloring Agents
Dyes
dyes
Crystalline materials
Liquids
liquids
Photocurrents
Excitons
photocurrents
casts
Monolayers
excitons
Quantum yield
Chromophores
assemblies
chromophores
metal surfaces
Photons
monomers
Monomers

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Chau, L. K., Osburn, E. J., Armstrong, N. R., O'Brien, D. F., & Parkinson, B. A. (1994). Dye sensitization with octasubstituted liquid crystalline phthalocyanines. Langmuir, 10(2), 351-353.

Dye sensitization with octasubstituted liquid crystalline phthalocyanines. / Chau, L. K.; Osburn, E. J.; Armstrong, Neal R; O'Brien, D. F.; Parkinson, B. A.

In: Langmuir, Vol. 10, No. 2, 02.1994, p. 351-353.

Research output: Contribution to journalArticle

Chau, LK, Osburn, EJ, Armstrong, NR, O'Brien, DF & Parkinson, BA 1994, 'Dye sensitization with octasubstituted liquid crystalline phthalocyanines', Langmuir, vol. 10, no. 2, pp. 351-353.
Chau LK, Osburn EJ, Armstrong NR, O'Brien DF, Parkinson BA. Dye sensitization with octasubstituted liquid crystalline phthalocyanines. Langmuir. 1994 Feb;10(2):351-353.
Chau, L. K. ; Osburn, E. J. ; Armstrong, Neal R ; O'Brien, D. F. ; Parkinson, B. A. / Dye sensitization with octasubstituted liquid crystalline phthalocyanines. In: Langmuir. 1994 ; Vol. 10, No. 2. pp. 351-353.
@article{0cae77523abe4e5fbd37d4ac1e20d747,
title = "Dye sensitization with octasubstituted liquid crystalline phthalocyanines",
abstract = "New liquid crystalline octaamide (C12) and octaester (C12) copper phthalocyanines (LC-Pc), which form self-assembled structures in solutions and in cast films, act as effective sensitizers for the photoelectrochemical response of the layered semiconductors, n-SnS2. The photocurrent yield spectra of these cast films, at a wide range of coverages, show a single sharp Q-band at a position corresponding to close packed monolayer assemblies of flat-lying Pc's. Quantum yields per absorbed photon are high (QYAP ≈ 44{\%}) for the close packed monolayers. In contrast, films from a short-chain substituted and an unsubstituted CuPc on SnS2 show Q-band photocurrent yield spectra due to both the monomer and H-aggregate forms. These phenomena suggest that the efficiency of exciton transport through a self-assembled LC-Pc film strongly depends on the separation distance between the chromophores. The interfacial structure of the mesogenic molecules at the semiconductor or metal surface appears to be critical in determining the overall exciton transport efficiency in columnar mesophases.",
author = "Chau, {L. K.} and Osburn, {E. J.} and Armstrong, {Neal R} and O'Brien, {D. F.} and Parkinson, {B. A.}",
year = "1994",
month = "2",
language = "English (US)",
volume = "10",
pages = "351--353",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "2",

}

TY - JOUR

T1 - Dye sensitization with octasubstituted liquid crystalline phthalocyanines

AU - Chau, L. K.

AU - Osburn, E. J.

AU - Armstrong, Neal R

AU - O'Brien, D. F.

AU - Parkinson, B. A.

PY - 1994/2

Y1 - 1994/2

N2 - New liquid crystalline octaamide (C12) and octaester (C12) copper phthalocyanines (LC-Pc), which form self-assembled structures in solutions and in cast films, act as effective sensitizers for the photoelectrochemical response of the layered semiconductors, n-SnS2. The photocurrent yield spectra of these cast films, at a wide range of coverages, show a single sharp Q-band at a position corresponding to close packed monolayer assemblies of flat-lying Pc's. Quantum yields per absorbed photon are high (QYAP ≈ 44%) for the close packed monolayers. In contrast, films from a short-chain substituted and an unsubstituted CuPc on SnS2 show Q-band photocurrent yield spectra due to both the monomer and H-aggregate forms. These phenomena suggest that the efficiency of exciton transport through a self-assembled LC-Pc film strongly depends on the separation distance between the chromophores. The interfacial structure of the mesogenic molecules at the semiconductor or metal surface appears to be critical in determining the overall exciton transport efficiency in columnar mesophases.

AB - New liquid crystalline octaamide (C12) and octaester (C12) copper phthalocyanines (LC-Pc), which form self-assembled structures in solutions and in cast films, act as effective sensitizers for the photoelectrochemical response of the layered semiconductors, n-SnS2. The photocurrent yield spectra of these cast films, at a wide range of coverages, show a single sharp Q-band at a position corresponding to close packed monolayer assemblies of flat-lying Pc's. Quantum yields per absorbed photon are high (QYAP ≈ 44%) for the close packed monolayers. In contrast, films from a short-chain substituted and an unsubstituted CuPc on SnS2 show Q-band photocurrent yield spectra due to both the monomer and H-aggregate forms. These phenomena suggest that the efficiency of exciton transport through a self-assembled LC-Pc film strongly depends on the separation distance between the chromophores. The interfacial structure of the mesogenic molecules at the semiconductor or metal surface appears to be critical in determining the overall exciton transport efficiency in columnar mesophases.

UR - http://www.scopus.com/inward/record.url?scp=0028374312&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028374312&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0028374312

VL - 10

SP - 351

EP - 353

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 2

ER -