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Observed Enhancement in LiBS Signals from Nano vs. Bulk ZnO Targets: Comparative Study of Plasma Parameters

World Journal of Nano Science and Engineering 2012年第4期2卷 181-188页

作者： Ashraf M. El Sherbini Abdel-Nasser M. Aboulfotouh Farid F. Rashid Sami H. Allam Ashraf El Dakrouri Tharwtt M. El Sherbini Collage of Applied Medical Science King Saud University KSA & the National Institute of Laser Enhanced Sciences Cairo University Giza Egypt Department of Laser and Opto-Electronic Engineering University of Technology Baghdad Iraq Department of Physics Laboratory of Lasers and New Materials Faculty of Science Cairo University Giza Egypt

in this article, we will report an experimental evidence of enhanced LiBS emission upon replacing a Bulk-Based ZnO target by the corresponding Nano-Based target. The plasma was initiated via interaction of a Nd:YAG laser at the fundamental wavelength with both targets in open air under the same experimental conditions. The measurements show an enhanced emission from the Zn i-lines at the wavelengths of 328.26, 330.29, 334.55, 468.06, 472.2, 481.01, 636.38 nm. The measurements were repeated at different delay times in the range from 1 to 5 μs at constant irradiation level and fixed gate time of 1 μs. The average enhancement over the different Zn i-lines was found increases exponentially up to 8-fold with delay time. The electron density to each plasma was measured utilizing the Hα-line appeared in the emitted spectra from each plasma and was found to give similar values. The electron temperatures were measured via Boltzmann plot method utilizing the relative intensities of the Zn i-lines and were found to give very close values. Moreover, the relative population density of the ground state of the zinc atoms (relative concentration) was measured spectroscopically utilizing the Boltzmann plot method and was found to increase in a very similar trend to that of enhancement. The results of the spectroscopic analysis conclude that these signal enhancements can be attributed to the higher concentration of neutral atoms in the Nano-Based material plasma with respect to the corresponding Bulk-based ZnO material.

关键词： LiBS Enhancement ZnO Nonmaterial Hα-Line Zn i-lines Spectroscopy

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