以十二烷基苯磺酸钠和六偏磷酸钠作为分散剂,采用沉淀法制备了ZnS及不同掺杂浓度的ZnS:Cr纳米晶.利用XRD和TEM对纳米晶物相和形貌进行了分析.结果表明,ZnS和ZnS:Cr纳米晶均为立方闪锌矿结构,利用谢乐公式估算ZnS和ZnS:Cr纳米晶平均粒径分别为2.1和2.2nm.TEM观察到纳米晶近似为球形,平均粒度为3nm左右,具有较好的单分散性且分布均匀.荧光光谱(PL)表明,纳米晶在420、440和495nm处有发射谱带,前两者被认为是S空位深陷阱发光,后者被认为是表面态或中心辐射复合发光.
ZnS and ZnS:Cr nanocrystals were synthesized by chemical co-precipitation method.Sodium lauryl benzenesulfate and sodium-hexametaphosphate were used as a dispersant.The crystalline,microscopy and luminescent properties of ZnS:Cr nanocrystals were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and photoluminescence (PL) spectra.The results show that ZnS:Cr nanocrystals have cubic zinc blende crystal structure,and the size of these spheroidal particles is about 3nm.At room temperature,the luminescence properties are investigated with PL spectra.In PL spectra,the emission peaks of ZnS:Cr at about 420 and 440nm,which may be attributed to sulfur vacancy.The emission peak at 495nm of ZnS:Cr be assigned to the emitting of surface states or centers of radiation.Fourier transform infrared red (FT-IR) spectroscopy results provide evidence of the presence of sodium-hexametaphosphate and TAA.
参考文献
| [1] | He Hu;Weihua Zhang .Synthesis and properties of transition metals and rare-earth metals doped ZnS nanoparticles[J].Optical materials,2006(5):536-550. |
| [2] | Shionoya S;Yen W M.Phosphor Handbook[M].NewYork:Washington D C,1999 |
| [3] | Xun Wang;Jing Zhuang;Qing Peng;Yadong Li .A general strategy for nanocrystal synthesis[J].Nature,2005(7055):121-124. |
| [4] | Soo Y L;Ming Z H;Huang S W et al.[J].Physical Review B,1994,50(11):7603-7607. |
| [5] | Kripal R;Bajpai M;Shukla AK .EPR and optical absorption study of Cr3+-doped ammonium oxalate monohydrate single crystals[J].Physica, B. Condensed Matter,2009(1):82-88. |
| [6] | Singh V;Chakradhar RPS;Rao JL;Kim DK .Combustion synthesized MgAl2O4:Cr phosphors-An EPR and optical study[J].Journal of Luminescence: An Interdisciplinary Journal of Research on Excited State Processes in Condensed Matter,2009(2):130-134. |
| [7] | da Fonseca R J M;Sosman L P;Dias Tavares A et al.[J].Journal of Fluorescence,2000,10(04):375-381. |
| [8] | Schneider L;Zaitsev S V;Jin W et al.[J].Nanotechnology,2009,20:135604,10. |
| [9] | Zhao M G;Xie L H .[J].Materials Science and Engineering,2000,B75:72-77. |
| [10] | Martyshkin D V;Kim C;Moskalev I S et al.[J].IEEE,2008,16(07):4952-4959. |
| [11] | Angeles L.The Sadtler Handbook of Infrared Spectra[M].London:Sadtler,1978 |
| [12] | Ranjani V .[J].Industrial and Engineering Chemistry Research,1997,36:5277-5281. |
| [13] | Wu QZ;Cao HQ;Zhang SC;Zhang XR;Rabinovich D .Generation and optical properties of monodisperse Wurtzite-type ZnS microspheres[J].Inorganic Chemistry: A Research Journal that Includes Bioinorganic, Catalytic, Organometallic, Solid-State, and Synthetic Chemistry and Reaction Dynamics,2006(18):7316-7322. |
| [14] | Leonid V A.Introduction to Solids[M].New York:McGraw-Hill,1960 |
| [15] | West A R.Solid State Chemistry and its Application[M].New York:wiley,1984 |
| [16] | He Jun;Ji Wei;Mi Jun et al.[J].Applied Physics Letters,2006,88:181114,3. |
| [17] | Goswami N;Sen P .Photoluminescent properties of ZnS nanoparticles prepared by electro-explosion of Zn wires[J].Journal of nanoparticle research: An interdisciplinary forum for nanoscale science and technology,2007(3):513-517. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%