Table of Contents
Journal of Nanoparticles
Volume 2014, Article ID 760712, 7 pages
http://dx.doi.org/10.1155/2014/760712
Research Article

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

1College of Physics Science and Technology, Hebei University, Baoding 071002, China
2Key Laboratory of Photo-Electricity Information Materials of Hebei Province, Baoding 071002, China

Received 19 November 2013; Accepted 15 February 2014; Published 30 March 2014

Academic Editor: Jerome Plain

Copyright © 2014 Zechao Deng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.