2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Green Chemical Approaches toward ZnSe Nanoparticles and Nanoflowers: Synthesis and Mechanism

Q. Dai, N. Xiao, B. Zou, G. Zou, W.W. Yu
Worcester Polytechnic Institute, US

Keywords:
ZnSe, nanoparticles, nanoflowers, synthesis, mechanism, green chemistry

Abstract:
A growing number of researchers are now integrating green chemistry principles into their synthetic routes to green nanomaterials. Green chemistry requires that not only the final products, but also the starting materials are green. Here, we introduce a nontoxic, simple, cheap and reproducible strategy, which meets the standard of green chemistry, for the synthesis of particle- and flower-shaped ZnSe nanocrystals. These as-synthesized nanomaterials with a zinc blende structure have a narrow size distribution without any postsynthetic size-selective procedure. The experimental results show that the production of these green nanoproducts can be readily scaled up and performed directly at ambient condition without reducing their qualities. The amount of precursors is a more sensitive parameter on the determination of the nanoparticle size than other reaction parameters. Variation of this parameter allows the nanoparticle size to be tuned in the high-temperature process, interpreted well by the growth kinetics. A systematic study of the nanocrystal formation process indicates that the reported “limited ligand protection” (LLP) mechanism cannot be employed to explain the formation of our nanoflowers. Instead, upon heating at high temperature, mononuclear Zn complex converts to polynuclear Zn complex with multiple Zn atoms. Each Zn atom grows into one ZnSe nanoparticle after the injection of Se solution. These nanoparticles closely connect and thus look like nanoflowers.


Nanotech 2008 Conference Program Abstract