本文利用微波辐射方法,在水相中直接快速制备,得到了谷胱甘肽修饰的水溶性ZnSe纳米晶,并详细讨论了制备条件(溶液中离子配比、PH值、反应温度和时间等)对结果的影响.在最佳条件下制备所得的ZnSe纳米晶,发射波长在360nm～410nm之间可调,荧光光谱半峰宽最小值可达到21nm.另外,进一步利用光辐射方法,对ZnSe纳米晶进行表面修饰,将其荧光量子效率提高到了55%.本文制备方法具有过程简单、经济的优点,此外,这种水溶性ZnSe纳米晶具有优良的光谱性能和良好的生物相溶性,可使其作为荧光探针进一步应用在生物领域.
In this paper, a novel method is presented for the rapid synthesis of glutathione (GSH) -capped ZnSe nanocrystals in aqueous phase assisted with microwave irradiation. The as-prepared ZnSe nanocrystals have tunable fluorescence emissions between 360 and 410 nm with narrow full width at half maximum (FWHM)of 21 nm. Moreover, the luminescent properties were greatly improved through photo-chemical treatment. Their photoluminescence quantum yields (PLQY) reached as high as 55% after illu-mination. The key synthesis parameters (molar ratio of reagents, pH values, reaction temperature, and time) are fully discussed. The facile synthesis of glutathione-capped ZnSe nanocrystals is free of compli-cated manipulations and cost-effective. Furthermore, the water-dispersed ZnSe nanocrystals with high luminescence and favorable biocompatibility allow their potential applications in biological imaging as fluo-rescent labels.
参考文献
| [1] | Bruchez M P;Moronne M;Gin P et al.Semiconductor nanocrystals as fluorescent biological labels[J].Science,1998,281:2013-2016. |
| [2] | Tsutsui T .Applied physics-A light-emitting sandwich filling[J].NATURE,2002,420:752-755. |
| [3] | Keith Barnham;Jose Luis Marques;John Hassard .Quantum-dot concentrator and thermodynamic model for the global redshift[J].Applied physics letters,2000(9):1197-1199. |
| [4] | Alivisatos A P .Perspectives on the physical chemistry of semiconductor nanocrystals[J].Journal of Physical Chemistry,1996,100:13226-13239. |
| [5] | Peter Reiss;Joel Bleuse;Adam Pron .Highly Luminescent CdSe/ZnSe Core/Shell Nanocrystals of Low Size Dispersion[J].Nano letters,2002(7):781-784. |
| [6] | Norris D J;Yao N;Charnock F T et al.High-Quality manganese-doped ZnSe nanocyrstals[J].Nano Letters,2001,1:3-7. |
| [7] | Hines M A;Guyot-Sionnest P .Bright UV-Blue luminescent colloidal ZnSe nanocrystals[J].Journal of Physical Chemistry B,1998,102:3655-3657. |
| [8] | Lin SL;Pradhan N;Wang YJ;Peng XG .High quality ZnSe and ZnS nanocrystals formed by activating zinc carboxylate precursors[J].Nano letters,2004(11):2261-2264. |
| [9] | Shavel A;Gaponik N;Eychmuller A .Efficient UV-Blue blue photoluminescing thiol-stabilized water-soluble alloyed ZnSe[S] nanocrystals[J].Journal of Physical Chemistry B,2004,108:5905-5908. |
| [10] | Gaponik N;Talapin D V;Rogach A L et al.Thiol-Capping of CdTe nanocrystals:An alternative to organometallic synthetic routes[J].Journal of Physical Chemistry B,2002,106:7177. |
| [11] | Huifeng Qian;Chaoqing Dong;Jifang Weng;Jicun Ren .Facile One-Pot Synthesis of Luminescent, Water-Soluble, and Biocompatible Glutathione-Coated CdTe Nanocrystals[J].Small,2006(6):747-751. |
| [12] | Zheng Y;Yang Z;Ying J Y .Aqueous synthesis of glutathione-capped ZnSe and Znl-xCdxSe alloyed quantum dots[J].Advanced Materials,2007,19:1475-1479. |
| [13] | Gerbee J A;D.Magana;A.Washington et al.Microwave-Enhanced reaction rates for nanoparticle synthesis[J].Journal of the American Chemical Society,1995,127:15791-15800. |
| [14] | He Y;Lu H T;Sai L M et al.Microwave-assisted growth and characterization of water-dispersed CdTe/CdS core-shell nanocrystals with high photoluminescence[J].Journal of Physical Chemistry B,2006,110:13370-13373. |
| [15] | Lan GY;Lin YW;Huang YF;Chang HT .Photo-assisted synthesis of highly fluorescent ZnSe(S) quantum dots in aqueous solution[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2007(25):2661-2666. |
| [16] | Zhang H;Zhou Z;Yang B et al.The influence of carboxyl groups on the photoluminescence of mercaptocarboxylic acid-stabilized CdTe nanoparticles[J].Journal of Physical Chemistry B,2003,107:8-13. |
| [17] | Borchert H;Talapin D V;Gaponik N et al.Relations between the photolumineacence efficiency of CdTe nanocrystals and their surface properties revealed by synchrotron XPS[J].Journal of Physical Chemistry B,2003,107:9662-9668. |
| [18] | Swayambunathan V;Hayes D;Schmidt K H et al.Thiol surface complexation on growing cadmium sulfide clusters[J].Journal of the American Chemical Society,1990,112:3831-3837. |
| [19] | Guo J;Yang W L;Wang C C .Systematic study of the photoluminescence dependence of thiol-capped CdTe nanocrystals on the reaction conditions[J].Journal of Physical Chemistry B,2005,109:17467-17473. |
| [20] | Hao Zhang;Liping Wang;Huanming Xiong;Lianghai Hu;Bai Yang;Wei Li .Hydrothermal Synthesis for High-Quality CdTe Nanocrystals[J].Advanced Materials,2003(20):1712-1715. |
| [21] | Mello Donega de C;Hickey S G;Wuister S F et al.Single-Step synthesis to control the photoluminescence quantum yield and size Dispersion of CdSe Nanocrystals[J].Journal of Physical Chemistry B,2003,107:489-496. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%