Photoelectrochemical properties of 'Q-state' CdS particles in arachidic acid Langmuir-Blodgett films

Herman S. Mansur, Franz Grieser, Mark S. Marychurch, Simon Biggs, Robert S. Urquhart, D. Neil Furlong

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

The photoelectrochemical (PEC) characteristics of thin films of 'Q-state' CdS semiconductor particles in arachidic acid Langmuir-Blodgett (LB) layers have been examined. Initially, 'Q-state' size CdS particles of ca. 2 nm were formed in the film and then progressively grown to ca. 10 nm by a cyclic sequence, which involves exposing the film to H2S(g) following its immersion in a CdCl2(aq) solution. A PEC cell was constructed using a layered glass/ITO-CdS/LB plate as the photoanode and a standard calomel electrode (SCE) as the reference electrode. The photoelectrical response of electrodes coated with LB films containing CdS particles of various sizes was investigated using white light. The reproducibility of current-voltage polarisation curves indicated the relatively good stability of the film to PEC degradation processes over several scanning cycles in the range 0 to -1000 mV vs. SCE. Values for the open-circuit (Voc) and the short-circuit current for the PEC cells were obtained and fill factors in the range 20 to 70-75% were calculated. Voc decreased from ca. -200 to ca. -800 mV vs. SCE with increasing particle size. This effect was attributed to the dielectric properties of the arachidic acid LB film matrix.

Original languageEnglish
Pages (from-to)665-672
Number of pages8
JournalJournal of the Chemical Society, Faraday Transactions
Volume91
Issue number4
DOIs
Publication statusPublished - 1 Dec 1995

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Langmuir Blodgett films
Langmuir-Blodgett films
Electrodes
acids
electrodes
Photoelectrochemical cells
Particle size
ITO glass
Cadmium Chloride
Networks (circuits)
short circuit currents
ITO (semiconductors)
cells
Short circuit currents
Dielectric properties
submerging
dielectric properties
arachidic acid
Polarization
Semiconductor materials

Cite this

Mansur, Herman S. ; Grieser, Franz ; Marychurch, Mark S. ; Biggs, Simon ; Urquhart, Robert S. ; Furlong, D. Neil. / Photoelectrochemical properties of 'Q-state' CdS particles in arachidic acid Langmuir-Blodgett films. In: Journal of the Chemical Society, Faraday Transactions. 1995 ; Vol. 91, No. 4. pp. 665-672.
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abstract = "The photoelectrochemical (PEC) characteristics of thin films of 'Q-state' CdS semiconductor particles in arachidic acid Langmuir-Blodgett (LB) layers have been examined. Initially, 'Q-state' size CdS particles of ca. 2 nm were formed in the film and then progressively grown to ca. 10 nm by a cyclic sequence, which involves exposing the film to H2S(g) following its immersion in a CdCl2(aq) solution. A PEC cell was constructed using a layered glass/ITO-CdS/LB plate as the photoanode and a standard calomel electrode (SCE) as the reference electrode. The photoelectrical response of electrodes coated with LB films containing CdS particles of various sizes was investigated using white light. The reproducibility of current-voltage polarisation curves indicated the relatively good stability of the film to PEC degradation processes over several scanning cycles in the range 0 to -1000 mV vs. SCE. Values for the open-circuit (Voc) and the short-circuit current for the PEC cells were obtained and fill factors in the range 20 to 70-75{\%} were calculated. Voc decreased from ca. -200 to ca. -800 mV vs. SCE with increasing particle size. This effect was attributed to the dielectric properties of the arachidic acid LB film matrix.",
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Photoelectrochemical properties of 'Q-state' CdS particles in arachidic acid Langmuir-Blodgett films. / Mansur, Herman S.; Grieser, Franz; Marychurch, Mark S.; Biggs, Simon; Urquhart, Robert S.; Furlong, D. Neil.

In: Journal of the Chemical Society, Faraday Transactions, Vol. 91, No. 4, 01.12.1995, p. 665-672.

Research output: Contribution to journalArticle

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AB - The photoelectrochemical (PEC) characteristics of thin films of 'Q-state' CdS semiconductor particles in arachidic acid Langmuir-Blodgett (LB) layers have been examined. Initially, 'Q-state' size CdS particles of ca. 2 nm were formed in the film and then progressively grown to ca. 10 nm by a cyclic sequence, which involves exposing the film to H2S(g) following its immersion in a CdCl2(aq) solution. A PEC cell was constructed using a layered glass/ITO-CdS/LB plate as the photoanode and a standard calomel electrode (SCE) as the reference electrode. The photoelectrical response of electrodes coated with LB films containing CdS particles of various sizes was investigated using white light. The reproducibility of current-voltage polarisation curves indicated the relatively good stability of the film to PEC degradation processes over several scanning cycles in the range 0 to -1000 mV vs. SCE. Values for the open-circuit (Voc) and the short-circuit current for the PEC cells were obtained and fill factors in the range 20 to 70-75% were calculated. Voc decreased from ca. -200 to ca. -800 mV vs. SCE with increasing particle size. This effect was attributed to the dielectric properties of the arachidic acid LB film matrix.

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