纳米材料的本征性质与其结构密切相关,在纳米尺度操控材料并表征其结构是纳米科学与技术的关键.采用热蒸发法制备了一种四足结构Znse纳米晶,通过高分辨透射电子显微镜对这种四足ZnSe纳米晶的晶体结构进行了表征.该ZnSe纳米晶由一个四面体的立方晶核和四个沿[001]方向生长的六方相分枝构成.本研究对这种ZnSe纳米晶的形貌和结构进行了讨论,证明了在Znse纳米晶内两种晶相的共存.根据ZnSe的结晶学特性和晶相的温度稳定性,解释了这种四足结构纳米晶的生长机制:Znse的四面体立方晶核在高温区域形成后,ZnSe蒸汽在低温区继续沉积在晶核上形成四个六方相的分支足,最终形成了具有立方晶核的ZnSe四足纳米晶.
Manipulation of materials with nanoscale control is the key of nanoscience and nanotechnology, because the intrinsic properties of nanoscale materials are closely determined by their structures. In this work, a tetrapod-shaped ZnSe nanostructure was synthesized successfully via thermal evaporation and their crystallographic structures were characterized by high-resolution transmission electron microscope. The morphology and construction of ZnSe nanostructure are discussed in detail. The as-grown ZnSe tetrapods include one zinc blende nucleus and four arms with uniform wurtzite structure growing along the [001] direc-tion. And the co-existence of two crystal structures in different domains of one ZnSe nanocrystal is experimentally demonstrated. According to the crystal phase stability in different temperature regions and crystallographic property of ZnSe, an acceptable growth model is employed to explain the formation process of this newly discovered ZnSe tetrapods nanocrystal.
参考文献
| [1] | Ahmadi T S.Wang Z L,Green T C.et al.Shape-controlled syntheais of colloidal platinum nanoparticles.Science,1996,272(5270):1924-1926. |
| [2] | Peng X G,Manna L,Yang W D.et al.Shape control of CdSe nanocrystals.Nature,2000,404 (6773):59-61. |
| [3] | Dai Y,Zhang Y,Wang Z L.The octa-twin tetraleg ZnO nanostructures.Solid State Commun.,2003,126(11):629-633. |
| [4] | Manna L,Milliron D J,Meisel A,et al.Controlled growth of tetrapod-branched inorganic nanocrystals.Nat.Mater.,2003,2(6):382-385. |
| [5] | Zhu Y C,Bando Y,Xue D F,et al.Nanocable-aligned ZnS tetrapod nanocrystals.J.Am.Chem.Soc.,2003,125 (52):16196-16197. |
| [6] | Hu J Q,Bando Y,Golberg D.Sn-catalyzed thermal evaporation synthesis of tetrapod-branched ZnSe nanorod architectures.Small,2005,1(1):95:99. |
| [7] | Cui Y,Banin U,Bjork M T,et al.Electrical transport through a single nanoscale semiconductor branch point.Nano Lett.,2005,5(7):1519-1523. |
| [8] | Nie L,Gao L Z.Feng P,et al.Three-dimensional functionalized tetrapod-like ZnO nanostructures for plasmid DNA delivery.Small,2006,2(5):621-625. |
| [9] | Takeuchi S.Iwanaga H.Fujii M.Octahedral multiple-twin model of tetrapod ZnO crystals.Phil.Mag.A,1994.69(6):1125-1129. |
| [10] | Ding Y,Wang Z L,Sun TJ.et al.Zinc-blende ZnO and its role in nucleating wurtzite tetrapods and twinned nanowires.Appl.Phys.Lett.,2007,90(15):153510-1-3. |
| [11] | Xu H Y,Liang Y.Liu Z A,et al.Synthesis and optical properties of tetrapod-like ZnSSe alloy nanostructures.Adv.Mater.,2008,20(17):3294-3297. |
| [12] | Manna L.Scher E C,Alivisatos A P.Synthesis of soluble and processabje rod-,arrw-,teardrop-,and tetrapod-shaped CdSe nanocrystals.J.Am.Chem.Soc.,2000,122(51):12700-12706. |
| [13] | Zhu Y C,Bando Y.Preparation and photoluminescence of singlecrystal zinc selenide nanowires.Chem.Phys.Lett.,2003,377(3/4):367-370. |
| [14] | Zhu Y C,Bando Y.Xue D F,et al.Oriented assemblies of ZnS one-dimensional nanostructures.Adv.Mater.,2004,16 (9/10):831-834. |
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