Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Z. Alfassi
  • D. Bahnemann
  • A. Henglein

Externe Organisationen

  • Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
  • Ben-Gurion University of the Negev (BGU)
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)4656-4657
Seitenumfang2
FachzeitschriftJournal of Physical Chemistry
Jahrgang86
Ausgabenummer24
PublikationsstatusVeröffentlicht - 1982
Extern publiziertJa

Abstract

Hydrated electrons are formed in the illumination of a CdS colloid and of ZnS/CdS co-colloids with a 347.2-nm laser flash. The yield is increased by excess sulfide anions. In the presence of 2 × 10-3 M Na2S, the quantum yield is 0.15 hydrated electrons per absorbed photon. The photoelectron emission from the colloids shows the intensity dependence of a monophotonic process. A mechanism is proposed in which the storage of a huge number of electrons for a short time after scavenging of positive holes by sulfide anions plays an important role. The accompanying cathodic potential changes enable part of the electrons to migrate from the colloidal particles into the aqueous phase.

ASJC Scopus Sachgebiete

Zitieren

Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids. / Alfassi, Z.; Bahnemann, D.; Henglein, A.
in: Journal of Physical Chemistry, Jahrgang 86, Nr. 24, 1982, S. 4656-4657.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Alfassi, Z, Bahnemann, D & Henglein, A 1982, 'Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids', Journal of Physical Chemistry, Jg. 86, Nr. 24, S. 4656-4657. https://doi.org/10.1021/j100221a002
Alfassi, Z., Bahnemann, D., & Henglein, A. (1982). Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids. Journal of Physical Chemistry, 86(24), 4656-4657. https://doi.org/10.1021/j100221a002
Alfassi Z, Bahnemann D, Henglein A. Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids. Journal of Physical Chemistry. 1982;86(24):4656-4657. doi: 10.1021/j100221a002
Alfassi, Z. ; Bahnemann, D. ; Henglein, A. / Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids. in: Journal of Physical Chemistry. 1982 ; Jahrgang 86, Nr. 24. S. 4656-4657.
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AU - Bahnemann, D.

AU - Henglein, A.

N1 - Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 1982

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AB - Hydrated electrons are formed in the illumination of a CdS colloid and of ZnS/CdS co-colloids with a 347.2-nm laser flash. The yield is increased by excess sulfide anions. In the presence of 2 × 10-3 M Na2S, the quantum yield is 0.15 hydrated electrons per absorbed photon. The photoelectron emission from the colloids shows the intensity dependence of a monophotonic process. A mechanism is proposed in which the storage of a huge number of electrons for a short time after scavenging of positive holes by sulfide anions plays an important role. The accompanying cathodic potential changes enable part of the electrons to migrate from the colloidal particles into the aqueous phase.

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