سال انتشار: ۱۳۹۰

محل انتشار: پنجمین کنفرانس بین المللی پیشرفتهای علوم و تکنولوژی

تعداد صفحات: ۹

نویسنده(ها):

Mahdi yousefi – Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, Iran-
Navid Shahabi Sani –
Hamid Ghomi –

چکیده:

Spark discharge method (SDM) is a useful way for synthesis of nanoparticles. Unlike conventional methods for metal nanoparticles synthesis, SDM method does not require application of chemical surfactants and stabilizers. In recent years, a few articles have investigated physical properties of electrical discharge plasmas used for nanoparticlesformation. The aim of this article is the study of spark discharge plasma parameters by means of Optical Emission Spectroscopy (OES) and relation of these parameters with input electrical power and size distribution of gold nanoparticles. We studied spark electrical dischargeplasma by stark broadening of hydrogen atoms. The spectrums contain a strong line of Hα and other lines originated from cracking of dielectric media by plasma and the lines originated from gold electrodes contamination. The effects of three dielectric medium are explored i)Deionized water, ii) Absolute ethanol and iii) Air. Furthermore the effect of input pulsed electrical power on plasma density and it’s relation to density and size distribution ofdispersed gold nanoparticles in liquid was investigated. Surface Plasmon resonance, SEM, XRD, and dynamic light scattering methods were used for investigation of nanoparticles. There were reasonable relation between OES experiment results and both input electrical power and gold nanoparticles distribution