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Porous Spherical Particles of ZnS Nanocrystallites

Published online by Cambridge University Press:  02 July 2020

M. Arnold ,
Z.L. Wang ,
S.M. Scholz ,
R. Vacassy  and
P. Stadelmann
M. Arnold
Affiliation:
Department of Materials Science, SwitzerlandCH-1015, Lausanne
Z.L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA30332-0245, USA
S.M. Scholz
Affiliation:
Department of Materials Science, SwitzerlandCH-1015, Lausanne
R. Vacassy
Affiliation:
Department of Materials Science, SwitzerlandCH-1015, Lausanne
P. Stadelmann
Affiliation:
Interdepartmental Center of Electronic Microscopy, Swiss Federal Institute of Technology Lausanne, SwitzerlandCH-1015Lausanne
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ZnS particles consisting of nanocrystallites have potential applications as light emitters for displays. The possibility of encapsulating chemicals into porous particles and the temperature-controlled release of them could also be of interest in chemical engineering. The objective of this study is to determine the size distribution, shape and morphology of ZnS particles synthesized under different conditions, since they strongly influence the optical and electric properties.

The ZnS powders were prepared by precipitation from homogeneous aqueous solutions, following a procedure described elsewhere1-3 The initial solution consists of a zincsalt precursor dissolved in ultrapure water under acidic pH conditions. Adding Thioacetamide (TAA: CH3C(S)NH2) to this acidic solution at elevated temperature leads to the precipitation of ZnS nanocrystals. Four different types of zincsalt precursors were used to study their influence on the precipitation process and the final powder morphology: acetate (CH3COO), chloride (Cl-), trifluoromethanesulfonate (tFMS: CF3SO3-) and dimethyldithiocarbamate (dMdTC: S4N2C6H12-). The dried powder were subjected to 350°C and 700°C heat treatments, respectively.

Type
Nanophase and Amorphous Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 718 - 719
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Vacassy, R. et al., submitted to: Journal of the American Ceramic SocietyGoogle Scholar
2.Scholz, S.M. et al., submitted to: J. Metal-organic Chem. for proceedings of ECNM Workshop 19.- 20.Sept. 1997 at ENEA Frascati, ItalyGoogle Scholar
3.Celikkaya, A. and Akinc, M., J. Am. Ceram. Soc, Vol. 73, 245 (1990)CrossRefGoogle Scholar