Asian Institute of Technology; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC)
Type
Article; Proceedings Paper
Source Title
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
ISSN
1468-6996
Year
2005
Volume
6
Issue
1
Open Access
gold
Publisher
TAYLOR & FRANCIS LTD
DOI
10.1016/j.stam.2005.03.006
Format
PDF
Abstract
We report the synthesis of luminescent nanoparticles of manganese doped zinc sulfide (ZnS:Mn2+) with an emission peak at around 590 nm. Nanoparticles of ZnS:Mn2+ are prepared by a co-precipitation reaction from homogenous solutions of zinc and manganese salts. Based on Ostwald ripening and surface passivation, we discuss a mechanism for the formation of ZnS:Mn2+ nanoparticles. The reaction proceeds with the nucleation of ZnS crystals, which are immediately passivated by the anions in the solution. This in turn attracts cations including zinc and manganese which contribute to the growth of the crystal. These nanoparticles are sterically stabilized using polyphosphates of sodium namely sodium tripolyphosphate (STTP) and sodium hexametaphosphate (SHMP). The nanoparticles consist of particles of 60-80 nm in diameter, each containing primary crystallites that was estimated from the X-ray diffraction patterns to be at around 2.2 nm. (c) 2005 Elsevier Ltd. All rights reserved.
