Kinetically Controlled Formation of a Novel Nanoparticulate ZnS with Mixed Cubic and Hexagonal Stacking

Journal Article · Sun Jan 01 04:00:00 EST 2006 · J Mater. Chem.

DOI:https://doi.org/10.1039/b512580d· OSTI ID:913950

Zhang, H; Chen, B; Gilbert, B; Banfield, J

Nanoparticulate ZnS with mixed cubic and hexagonal close packed stacking was synthesized by reaction of zinc acetate with thioacetamide in weakly acidic solutions. The influences of temperature, reaction time, amounts of reagents and solution pH on the nanoparticle size and phase constitution were investigated. Experimental results suggest that the stacking in the nano-ZnS is controlled primarily by the precipitation kinetics. Factors that slow the precipitation rate favor the growth of nanoparticles with mixed stacking, probably because the probabilities of forming wurtzite-like layers and sphalerite-like layers under these conditions are approximately equal. Under conditions of rapid precipitation, the growth of sphalerite is favored, probably due to the aggregation of molecular clusters with sphalerite-like structure. UV-vis spectroscopy reveals that twins and stacking faults in nano-ZnS result in an electronic structure that differs from those of nano-scale sphalerite and wurtzite. New vibrational modes present in IR spectra of the nano-ZnS with mixed stacking indicate that the materials have novel optical properties. Control of defect microstructure may allow use of nano-ZnS in new technological applications.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 913950
• Report Number(s): BNL--78518-2007-JA
• Journal Information: J Mater. Chem., Journal Name: J Mater. Chem. Journal Issue: 3 Vol. 16; ISSN JMACEP; ISSN 0959-9428
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CUBIC LATTICES
ELECTRONIC STRUCTURE
HEXAGONAL LATTICES
NANOSTRUCTURES
OPTICAL PROPERTIES
PRECIPITATION
REACTION KINETICS
STACKING FAULTS
SYNTHESIS
TWINNING
ZINC SULFIDES
national synchrotron light source