Thiol surface complexation on growing CdS clusters

Journal Article · Wed May 09 00:00:00 EDT 1990 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00166a017· OSTI ID:6551618

Swayambunathan, V; Hayes, D; Schmidt, K H; Liao, Y X; Meisel, D ^[1]

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1. Argonne National Lab., IL (USA)

The growth of small CdS colloidal particles has been initiated by pulse radiolytic release of sulfide from thiol (3-mercapto-1,2-propanediol, RSH) in the presence of Cd{sup 2+} ions. The kinetics and stoichiometry of the ensuring reactions were followed by conductivity, absorption spectroscopy, and light-scattering techniques. The final CdS product has been identified by electron diffraction. The formation of Cd-thiolate complexes at the surface of the particles is indicated by conductivity and by energy dispersive analysis of X-ray (EDAX) results. The rate of formation of CdS clusters is strongly pH dependent due to the pH effect on the stability of Dd{sup 2+}/HS{sup {minus}} complexes. At low pHs (4.0-5.3) the growth mechanism is proposed to be primarily a cluster-molecule process. At this pH range Cd{sup 2+} ions at the CdS particle surface complex with thiolate ions stronger than in the bulk of the solution. The size control of the particles by thiols is proposed to result from a competition of thiolate ions with HS{sup {minus}} ions for cadmium ions at the surface of the growing particles.

• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6551618
• Journal Information: Journal of the American Chemical Society; (USA), Vol. 112:10; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM SULFIDES
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
SEMICONDUCTOR MATERIALS
DATA ANALYSIS
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
THIOLS
CADMIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
INFORMATION
INORGANIC PHOSPHORS
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHOSPHORS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
360601* - Other Materials- Preparation & Manufacture