通过简单的两步热蒸发方法成功地实现了ZnO纳米管和纳米棒的集成.SEM结果表明,大量的纳米线以层层生长的机理从约200℃低温Si基片表面生长出来.EDS和XRD结果进一步表明第一步所制备的样品主要是由大量Zn和少量Zn的氧化物组成.第二步所制备样品的SEM和TME图像证实了在高温下以第一步所制备的样品作为第二步的基片,可实现纳米管和纳米棒的集成.TEM图像表明,纳米管的表面所生长的纳米棒是单晶的.通过改变工作气压,可调控纳米管表面纳米棒的尺寸和形貌,实现ZnO纳米结构可控生长.室温光致发光谱表明,样品的光学性质可通过可控的形貌来调制.
Integration of ZnO nanotubes and nanorods is realized through simple two-step thermal evaporation deposition process. SEM image indicates that a number of nanowires grow from ～200℃ Si substrate via layer-by-layer growth model. EDS and XRD results display that one-step-prepared samples consist of plentiful Zn and little oxide. SEM and TEM images of samples prepared at step two testify that at high temperature, integration of ZnO nanotubes and nanorods is realized using the one-step-prepared samples as substrate. TEM results indicate that the nanorods on the surface of nanotubes are single crystal. The variety of work pressures may control the size and morphology of nanorods located on the surface of nanotubes, resulting in the formation of ZnO nanostructures with controllable morphologies. The morn-temperature photoluminescence spectra show that the optical properties of samples can be modulated by controllable morphology.
参考文献
| [1] | Huang M H;Mao S;Feick H et al.Room-temperature ultraviolet nanowire nanolasers[J].Science,2001,292:1897. |
| [2] | Chen YF.;Yao TF.;Bagnall D. .ZnO as a novel photonic material for the UV region[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2000(2/3):190-198. |
| [3] | Li Q H;Wang Q;Chen Y J et al.Stable field emission from tetrapod-like ZnO nanostructures[J].Applied Physics Letters,2004,85:636. |
| [4] | Lin YH.;Tang ZL.;Yuan FL.;Li JL.;Zhang ZT. .Characterisation of ZnO-based varistors prepared from nanometre precursor powders[J].Advanced materials for optics and electronics,1999(5):205-209. |
| [5] | Law M;Greene LE;Johnson JC;Saykally R;Yang PD .Nanowire dye-sensitized solar cells[J].Nature materials,2005(6):455-459. |
| [6] | Pan Z W;Dai Z R;Wang Z L .Nanobelts of semiconducting oxides[J].Science,2001,291:1947. |
| [7] | Kong X Y;Ding Y;Yang R S et al.Single-crystal nanorings formed by epitaxial self-colling of oolar nanobelts[J].Science,2004,303:1348. |
| [8] | Yan H Q;He R R;Johnson J et al.Dendritic nanowire ultraviolet laser array[J].Journal of the American Chemical Society,2003,125:4728. |
| [9] | Fan H J;Scholz R;Kolb F M et al.Two-dimensional dendritic ZnO nanowires from oxidation of Zn microcrystals[J].Applied Physics Letters,2004,85:4142. |
| [10] | Chik H;Liang J;Cloutier S G et al.Periodic array of uniform ZnO nanorods by second-order self-assembly[J].Applied Physics Letters,2004,84:3376. |
| [11] | Hu JQ.;Li Q.;Meng XM.;Lee CS.;Lee ST. .Thermal reduction route to the fabrication of coaxial Zn/ZrO nanocables and ZnO nanotubes[J].Chemistry of Materials,2003(1):305-308. |
| [12] | Yan H Q et al.Morphogenesis of one-dimensional ZnO nano-and microcrystals[J].Advanced Materials,2003,15:402. |
| [13] | Zhou X F;Chen S Y;Zhang D Y et al.Microsphere organization of nanorods directed by PEG linear polymer[J].Langmuir,2006,22:1383. |
| [14] | Lao J Y;Wen J G;Ren Z F .ZnO nanobridges and nanonails[J].Nano Letters,2003,3:235. |
| [15] | Wu J J;Liu S C .Catalyst-free growth and characterization of ZnO nanorods[J].Journal of Physical Chemistry B,2002,106:9546. |
| [16] | Shen GZ;Bando Y;Liu BD;Golberg D;Lee CJ .Characterization and field-emission properties of vertically aligned ZnO nanaonails and nanopencils fabricated by a modified thermal-evaporation process[J].Advanced functional materials,2006(3):410-416. |
| [17] | Park W I;Kim D H;Jung S W et al.Metalorganic vaporphase epitaxial growth of vertically well-aligned ZnO nanorods[J].Applied Physics Letters,2002,80:4232. |
| [18] | Fan DH;Ning ZY;Jiang MF .Characteristics and luminescence of Ge doped ZnO films prepared by alternate radio frequency magnetron sputtering[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2005(1/4):414-419. |
| [19] | Tong Y H;Liu Y C;Shao C L et al.Structural and optical properties of ZnO nanotower bundles[J].Applied Physics Letters,2006,88:123111. |
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