Influence of ambient gas on the microstructural properties of Er-doped nanocrystalline Si film fabricated by pulsed laser ablation

2007 ◽  
Author(s):  
Yang Zhou ◽  
Lizhi Chu ◽  
Pingguang Duan ◽  
Wei Xu ◽  
Yinglong Wang ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Microstructural Properties ◽  
Ambient Gas ◽  
Er Doped ◽  
Nanocrystalline Si

Silicon and zinc telluride nanoparticles synthesized by low energy density pulsed laser ablation into ambient gases

1999 ◽  
Vol 14 (2) ◽  
pp. 359-370 ◽  
Author(s):  
Douglas H. Lowndes ◽  
Christopher M. Rouleau ◽  
T.G. Thundat ◽  
G. Duscher ◽  
E.A. Kenik ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Energy Density ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Gas Pressure ◽  
Low Energy ◽  
Crystalline Core ◽  
Ambient Gases ◽  
The Mean ◽  
Ambient Gas

The size distributions of Si and ZnTe nanoparticles produced by low energy density ArF (193 nm) pulsed laser ablation into ambient gases were measured as a function of the gas pressure, P, and target-substrate separation, Dts. For both Si and ZnTe, the largest nanoparticles were found closest to the ablation target, and the mean nanoparticle size decreased with increasing Dts. For Si ablation into He, the mean nanoparticle diameter did not increase monotonically with gas pressure but reached a maximum near P = 6 Torr. High resolution Z-contrast transmission electron microscopy and energy loss spectroscopy revealed that ZnTe nanoparticles consist of a crystalline core surrounded by an amorphous ZnO shell; growth defects and surface steps are clearly visible in the crystalline core. A pronounced narrowing of the ZnTe nanocrystal size distribution with increasing Dts also was found. The results demonstrate that the size of laser-ablated nanoparticles can be controlled by varying the molecular weight and pressure of an ambient gas and that nanometer-scale particles can be synthesized. Larger aggregates of both ZnTe and Si having a “flakelike” or “weblike” structure were formed at the higher ambient gas pressures; for ZnTe these appear to be open agglomerates of much smaller (∼10 nm) particles.

Microstructural Properties of Phase-Change Ge2Sb2Te5 Nanoparticles Grown by Pulsed-Laser Ablation

2009 ◽  
Vol 9 (2) ◽  
pp. 901-904 ◽  
Author(s):  
A. R. Jeong ◽  
H. R. Yoon ◽  
Y. J. Oh ◽  
T. Y. Kim ◽  
W. Jo ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Phase Change ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Microstructural Properties

Prompt electron emission and collisional ionization of ambient gas during pulsed laser ablation of silver

1998 ◽  
Vol 67 (5) ◽  
pp. 557-561 ◽  
Author(s):  
R.C. Issac ◽  
G.K. Varier ◽  
P. Gopinath ◽  
S.S. Harilal ◽  
V.P.N. Nampoori ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Electron Emission ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Ambient Gas ◽  
Collisional Ionization

scholarly journals Upconversion Properties of the Er-Doped Y 2 O 3 , Bi 2 O 3 and Sb 2 O 3 Nanoparticles Fabricated by Pulsed Laser Ablation in Liquid Media

2013 ◽  
Vol 30 (11) ◽  
pp. 118103 ◽  
Author(s):  
Reza Zamiri ◽  
Hamid-Reza Bahari-Poor ◽  
Azmi Zakaria ◽  
Raheleh Jorfi ◽  
Golnoush Zamiri ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Liquid Media ◽  
Laser Ablation In Liquid ◽  
Er Doped

The comparison of growing process of nanocrystalline Si films deposited by pulsed laser ablation in He, Ne, and Ar

2006 ◽  
Author(s):  
Lizhi Chu ◽  
Yang Zhou ◽  
Changyu Yan ◽  
Deqi Wu ◽  
Zheng Yan ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Si Films ◽  
Nanocrystalline Si

scholarly journals Influence of Gas Sort on the Nucleation Region Width of Si Nanocrystal Grains Prepared by Pulsed Laser Ablation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Zechao Deng ◽  
Lizhi Chu ◽  
Xuecheng Ding ◽  
Aili Qin ◽  
Guangsheng Fu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Gas Flow ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Effective Energy Transfer ◽  
Si Nanocrystal ◽  
Mean Size ◽  
Ambient Gases ◽  
Ambient Gas

We have calculated the nucleation region (NR) location of Si nanocrystal grains prepared by pulsed laser ablation (PLA) with fluence of 4 J/cm2 in 10 Pa gas at room temperature, and ambient gases were He, Ne, and Ar, respectively. Results of calculation indicated that NR width in Ne gas was narrowest, while it was widest in He gas. Maximum mean size of grains deposited on substrates under ablated spot, which were placed horizontally, was the smallest in Ne gas. It would be attribute to more effective energy transfer during the process of collision when atomic mass of Si and ambient gas Ne are more close to each other. In this work, an additional gas flow with the same element as ambient gas was introduced, which is vertical to the plume axis at different lateral positions above ablated spot.

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