采用KrF脉冲准分子激光器烧蚀金刚石结构多晶Ge靶材, 选取合适的靶与衬底间的距离、氩气压力以及沉积时间, 在单晶Si(100)衬底上首次制备了四方结构的Ge纳米颗粒, 扫描电子显微镜表征显示这些Ge纳米颗粒有橄榄球状的外形. 透射电子显微镜和选区电子衍射结果显示, 这些橄榄球状的Ge纳米颗粒是四方结构的单晶. 而这些Ge纳米颗粒的形成是由于脉冲激光击打Ge靶产生的小的团簇在局域高温的作用下生成四方结构的团簇, 而这些四方结构的团簇和Ar气原子发生碰撞并聚集到一起形成橄榄球状Ge纳米颗粒.
Germanium nanocrystals (Ge-Ncs) were well synthesized by using a KrF excimer laser ablation to ablate polycrystalline Ge target with diamond structure. The rugby-like Ge nanocrystals with tetragonal structure were synthesized on Si(100) substrate by adjusting target-substrate distance, Ar pressure and ablating time. Scanning electron microscopy showed that these Ge-NCs had a rugby-ball like shape; transmission electron microscopy and selected area electron diffraction showed that the synthesized Ge-NCs were of single-crystal state with tetragonal structure. Some small clusters were generated when pulse laser ablated the target and the tetragonal structure was formed due to the local high temperature and pressure. These small clusters with tetragonal structure aggregated to form rugby-ball like nanocrystals due to the collision with Ar gas atoms.
参考文献
| [1] | Xia Y;Yang P;Sun Y;Wu Y Mayers B Gates B Yin Y Kim F Yan H .One-dimensional nanostructures:Synthesis,characterization,and applications[J].Advanced Materials,2003,15:353. |
| [2] | 崔大田,王志法,姜国圣,周俊.Au-19.25Ag-12.80Ge钎料的焊接性能研究[J].稀有金属,2008(03):269-273. |
| [3] | Ge M Y;Liu J F;Wu H P;Yao C W,Zeng Y W,Fu Z D,Zhang S L,Jiang J Z .Synthesis of germanium nanowires[J].Journal of Physical Chemistry C,2007,111:11157. |
| [4] | Nozaki S.;Ono H.;Morisaki H.;Iwase M.;Sato S. .GERMANIUM NANOSTRUCTURES DEPOSITED BY THE CLUSTER-BEAM EVAPORATION TECHNIQUE[J].Nuclear Instruments and Methods in Physics Research, Section B. Beam Interactions with Materials and Atoms,1997(1/4):455-458. |
| [5] | Mathur S;Shen H;Sivakov V;Werner U .Germanium nanowires and core-shell nanostructures by chemical vapor deposition of[Ge(C_5H_5)_2][J].CHEMISTRY OF MATERIALS,2004,16:244. |
| [6] | Lauhon LJ;Gudiksen MS;Wang D;Lieber CM .Epitaxial core-shell and core-multishell nanowire heterostructures.[J].Nature,2002(6911):57-61. |
| [7] | Lu X M;Ziegler K J;Ghezelbash A;Johnston K P Korgel B A .Synthesis of germanium nanocrystals in high temperature supercritical fluid solvents[J].Nano Letters,2004,4:969. |
| [8] | Wang W Z;Huang J Y;Ren Z F .Synthesis of germanium nanocubes by a low-temperature inverse micelle solvothermal technique[J].Langmuir,2005,21:751. |
| [9] | Mei Y F;Li Z M;Chu R M;Tang Z K Siu G G Fu R K Y Chu P K Wu W Cheah K W .Synthesis and optical properties of germanium nanorod arry fabricated on prous anodic alumina and Si-bases templates[J].Applied Physics Letters,2005,86:021111. |
| [10] | Pan Z W;Dai Z R;Wang Z L .Nanobelts of semiconducting oxides[J].Science,2001,291:1947. |
| [11] | Menoni C S;Hu J Z;Spain I L .Systematics of spontaneous emission of intermediate mass fragments from heavy nuclei[J].Physical Review B,1986,34:362. |
| [12] | YU Wei,WANG Bao-zhu,LU Wan-Bing,YANG Yan-bin,HAN Li,FU Guang-Sheng.Growth of Nanocrystalline Silicon Films by Helicon Wave Plasma Chemical Vapour Deposition[J].中国物理快报（英文版）,2004(07):1320-1322. |
| [13] | Rath S.;Ono H.;Nozaki S.;Morisaki H.;Sato S. .Evidence of a tetragonal structure of germanium nanocrystals prepared by the cluster-beam deposition technique[J].Materials Chemistry and Physics,1998(1/3):244-246. |
| [14] | Sato S;Nozaki S;Morisaki H;Iwase M .Tetragonal germanium films deposited by the cluster-beam evaporation technique[J].Applied Physics Letters,1995,66:3176. |
| [15] | Maruyama S;Anderson L R;Smalley R E .Laser annealing of silicon clusters[J].Journal of Chemical Physics,1990,93:5349. |
| [16] | Mujica A;Needs R .First-principles calculations of the structural properties,stability,and band structure of complex tetrahedral phases of germanium:ST12 and BC8[J].Physical Review B,1993,48:17010. |
| [17] | Crain J;Clark S J;Ackland G J;Payne M C,Milman V,Hatton P D .Theoretical study of high-density phases of covalent semiconductors.I.Ab initio treatment[J].Physical Review B,1994,49:5329. |
| [18] | Pizzagalli L.;Klepeis JE.;Gygi F.;Galli G. .Structure and stability of germanium nanoparticles - art. no. 165324[J].Physical Review.B.Condensed Matter,2001(16):165324-1-165324-5. |
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