Lan, Yang-Wei and Lin, Zong-Hong and Chang, Huan-Tsung (2010) Synthesis and characterization of ZnxHg1-xSeyS1 quantum dots. Journal of Nanoparticle Research, 12 (4). pp. 1377-1388.
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Official URL: http://dx.doi.org/10.1007/s11051-009-9683-1
This article describes the synthesis of highly water-soluble Zn x Hg1âx Se y S1ây quantum dots (QDs) in aqueous solution through a simple photo-assisted reaction between ZnSe QDs and mercury(I) nitrate dihydrate [Hg2(NO3)2Â·2H2O]. In order to deduce the optimal synthesis conditions, we varied several parameters, including the concentrations of mercaptosuccinic acid (MSA) and Hg2(NO3)2Â·2H2O, the illumination time, and the reaction temperature. When irradiated at temperatures below 80 Â°C, the ZnSe QDs reacted with the S2â ions formed rapidly from MSA and the Hg2+ ions formed from Hg2 2+ ions to form Zn x Hg1âx Se y S1ây QDs through a process of photo-etching and surface combination. Under different conditions, we prepared a series of Zn x Hg1âx Se y S1ây QDs that emit fluorescence at the maximum wavelengths ranging from 405 to 760 nm. Inductively coupled plasma-mass spectrometry and transmission electron microscopy/energy dispersive spectrometry revealed that the content of Hg in the Zn x Hg1âx Se y S1ây QDs was greater when the synthesis was conducted at higher temperature. The Zn0.88Hg0.12Se0.44S0.56 QDs exhibit improved photostability than crude ZnSe QDs and possess long lifetimes (Ï1 ~ 38 ns and Ï2 ~ 158 ns).
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||13 May 2010 12:54|
|Last Modified:||13 May 2010 13:19|
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