Transient bleaching of small PbS colloids. Influence of surface properties

Journal Article · Thu Aug 09 00:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100379a044· OSTI ID:6443038

Nenadovic, M T; Comor, M I; Vasic, V; Micic, O I ^[1]

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1. Boris Kidric Institute, Belgrade (Yugoslavia)

Small PbS colloids with a particle diameter of 40 {angstrom} were prepared in aqueous solution, and their absorption spectra exhibit several maxima. Injection of electrons into these particles was achieved by using the pulse radiolysis technique. Excess electrons trapped on the surface lead to a blue shift in the absorption edge of colloids. The appearance of this shift depends critically on the method of colloid preparation. PbS and CdS colloids prepared at pH < 6 have long-lived bleaching, which disappears after several seconds. On the other hand, absorption bleaching does not appear after the addition of hydroxide ions to colloidal solutions (pH > 8). The existence of a hydroxide ion on the particle surface most likely removes surface defects on which electrons are trapped. PbS colloids prepared in the presence of 3-mercapto-1,2-propanediol have an unstructured absorption spectrum, which is due to a wide particle size distribution (10-50 {angstrom}).

• OSTI ID: 6443038
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:16; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
LEAD SULFIDES
SURFACE PROPERTIES
ABSORPTION SPECTRA
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
PHOTOCHEMISTRY
SEMICONDUCTOR MATERIALS
CHALCOGENIDES
CHEMISTRY
DATA
INFORMATION
LEAD COMPOUNDS
MATERIALS
NUMERICAL DATA
SPECTRA
SULFIDES
SULFUR COMPOUNDS
360603* - Materials- Properties