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Green chemical approaches to ZnSe quantum dots: preparation,
characterisation and formation mechanism Lanlan Chen a ; Yang Jiang a ; Chun Wang a ; Xinmei Liu a ; Yan Chen a ; Jiansheng Jie b
a School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009,
PR China b Department of Applied Physics, Hefei University of Technology, Hefei, Anhui 230009, PR
China Online publication date: 24 March 2010
To cite this Article Chen, Lanlan , Jiang, Yang , Wang, Chun , Liu, Xinmei , Chen, Yan and Jie, Jiansheng(2010) 'Green chemical approaches to ZnSe quantum dots: preparation, characterisation and formation mechanism', Journal of Experimental Nanoscience, 5: 2, 106 — 117
To link to this Article: DOI: 10.1080/17458080903314022
URL: /10.1080/17458080903314022
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Journal of Experimental Nanoscience
Vol.5,No.2,April 2010,106–117
Green chemical approaches to ZnSe quantum dots:preparation,
characterisation and formation mechanism
Lanlan Chen a ,Yang Jiang a *,Chun Wang a ,Xinmei Liu a ,Yan Chen a and Jiansheng Jie b a
School of Materials Science and Engineering,Hefei University of Technology,Tunxi Road 193,Hefei,Anhui 230009,PR China;b Department of Applied Physics,Hefei University of Technology,Hefei,Anhui 230009,PR China
(Received 13April 2009;final version received 6September 2009)
ZnSe quantum dots (QDs)and flower-shaped nanocrystals (NCs)were success-
fully synthesised via a cheap,green and nontoxic route,using environmentally
friendly N,N-dimethyl-oleoyl amide as the solvent of Se.The experimental results
show that the as-prepared ZnSe QDs with a zinc-blende structure have a narrow
size distribution and without resorting to any as-synthetic size-selective
procedure.A systematic study of the ZnSe QDs formation process indicates the
following properties:variation of some reaction parameters allows us to tune the
particle sizes and plays a greater role in the determination of the monodisperse
characterisation,for example,these parameters include the amount of ligand and
precursors,the injection temperature of Se solution.These size tunabilities
interpreted well by the growth kinetics.Another interesting result is that the ZnSe
QDs aggregate to flower-shaped NCs,and the flower-shaped NCs also have size-
dependence quantum effects as the prepared disperse ZnSe QDs.
Keywords:ZnSe;quantum dots;green chemistry;II–VI group semiconductors 1.Introduction Synthesis of semiconductor quantum dots (QDs)or nanocrystals (NCs)by means of
pyrolysis in hot surfactant mixtures has evolved over the past 10years to produce a variety of high quality materials in colloidal solutions ranging from II–VI NCs,for example,CdS,CdSe,CdTe,HgTe,[1–6]ZnS,ZnSe and ZnTe,[7–9]to III–V,for example,InAs and InP,
[6,10]and II–VI,for example,PbS and PbSe,[11,12]QDs.Semiconductor QDs are of great interest for both fundamental research and industrial applications,such as biomedical tag [13,14],lightemitting diodes [15,16],laser [17,18]and solar cells [19].Most of the interest is focussed on CdSe QDs,because their optical spectra can be made to cover the whole visible range by simply tuning their particles size [20,21].The highly toxic component cadmium,however,places CdSe QDs in a disadvantageous position or even in a doubtful future.Cadmium could be released from CdSe NCs.Any leakage of cadmium would be fatal to biological systems,and eventually cadmium containing products would *Corresponding author.Email:apjiang@
ISSN 1745–8080print/ISSN 1745–8099online
ß2010Taylor &Francis
DOI:10.1080/17458080903314022
D o w n l o a d e d A t : 14:52 4 S e p t e m b e r 2010
