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

Z. Alfassi; D. Bahnemann; A. Henglein

doi:10.1021/j100221a002

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

Z. Alfassi, D. Bahnemann, A. Henglein

Unit of Nuclear Engineering

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

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.

Original language	English
Pages (from-to)	4656-4657
Number of pages	2
Journal	Journal of Physical Chemistry
Volume	86
Issue number	24
DOIs	https://doi.org/10.1021/j100221a002
State	Published - 1 Jan 1982

ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

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

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.",

author = "Z. Alfassi and D. Bahnemann and A. Henglein",

year = "1982",

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doi = "10.1021/j100221a002",

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T1 - Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids

AU - Alfassi, Z.

AU - Bahnemann, D.

AU - Henglein, A.

PY - 1982/1/1

Y1 - 1982/1/1

N2 - 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.

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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SN - 0022-3654

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JF - Journal of Physical Chemistry

IS - 24

ER -

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

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