利用物理热蒸发法在1 016～1 066℃的温度范围内成功制备出定向排列生长的硅微米晶须.借助扫描电子显微镜(SEM),X射线能谱分析仪(EDX)和透射电子显微镜(TEM)研究了硅微米晶须的形貌、化学成分及晶体结构,讨论了环境压力对硅微米晶须生长有序性的影响.研究结果表明,在环境压力为13.3kPa时,硅微米晶须均垂直于衬底表面生长,定向排列生长的硅微米晶须面积可达13mm×6mm;硅微米晶须的生长遵循气-液-固(VLS)机制;透射电子显微镜观察及选取电子衍射花样表明,硅微米晶须的球形头部为晶体,杆的中部为晶体外包覆非晶体的结合体,杆的尾部为非晶体;环境压力越低,硅微米晶须的定向排列的方向性越好.
参考文献
| [1] | 张信义 .准一维纳米材料有序微阵列体系的模板合成及表征[D].中国科学院固体物理研究所,2001. |
| [2] | Wang J C;Feng S Q;Yu D P .Highly - quality GaN nanowires synthesized using a CVD approach[J].Applied Physics A:Materials Science and Processing,2002,75:691-693. |
| [3] | Dongsheng Xu;Yuxiang Yu;Miao Zheng;Guolin Guo;Youqi Tang .Electrochemical fabrication of one-dimensional silica nanostructures[J].Electrochemistry communications,2003(8):673-676. |
| [4] | Y. H. Tang;Y. F. Zhang;H. Y. Peng;N. Wang;C. S. Lee;S. T. Lee .Si nanowires synthesized by laser ablation of mixed SiC and SiO_2 powders[J].Chemical Physics Letters,1999(1/2):16-20. |
| [5] | Zhang Z.;Xu L.;Lee CS.;Lee ST.;Fan XH. .Morphology and growth mechanism study of self-assembled silicon nanowires synthesized by thermal evaporation[J].Chemical Physics Letters,2001(1/3):18-24. |
| [6] | Wang N.;Zhang YF.;Yu DP.;Lee CS.;Bello I.;Lee ST.;Tang YH. .Transmission electron microscopy evidence of the defect structure in Si nanowires synthesized by laser ablation[J].Chemical Physics Letters,1998(5-6):368-372. |
| [7] | Yu DP.;Hang QL.;Yan HF.;Xu J.;Xi ZH.;Feng SQ.;Xing YJ. .Controlled growth of oriented amorphous silicon nanowires via a solid-liquid-solid (SLS) mechanism[J].Physica, E. Low-dimensional systems & nanostructures,2001(2):305-309. |
| [8] | Dai L.;Chen XL.;Zhou T.;Hu BQ. .Aligned silica nanofibres[J].Journal of Physics. Condensed Matter,2002(25):L473-L477. |
| [9] | Liu ZQ.;Sun LF.;Tang DS.;Zou XP.;Li YB.;Wang CY.;Wang G. Xie SS.;Zhou WY. .Growth of amorphous silicon nanowires[J].Chemical Physics Letters,2001(5-6):523-528. |
| [10] | Peng Hong Ying;Pan Zheng Wei;Xu Lu et al.Temperature dependence of Si nanowire morphology[J].Advanced Materials,2004,13:317-320. |
| [11] | Givargizov E L .[J].Journal of Crystal Growth,1975,31:20. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%