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Optical Properties of Pure ZnSe Nanocrystals Synthesized by Laser Ablation in Organic Liquids |
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| Authors: | F Mosmer M J Torkamany J Sabbaghzadeh D Dorranian |
| Institution: | 1. Physics Department, Faculty of Science, Islamic Azad University, North Tehran Branch, Tehran, Iran 2. Iranian National Center for Laser Science and Technology (INLC), PO Box 14665-576, Tehran, Iran 3. Center for Advanced Science and Technology, Islamic Azad University, Tehran, Iran 4. Laser Lab., Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran |
| Abstract: | Synthesis of the zinc selenide (ZnSe) nanocrystals (NCs) by pulsed laser ablation approach is reported in two distinct liquid media (ethanol and acetone) by means of the 1st harmonic of high frequency Nd:YAG laser. Based on the X-ray diffraction (XRD) pattern, ZnSe NCs have both wurtzite and zinc blende structures with some overlapping peaks. Transmission electron microscopy (TEM) reveals that as-synthesized NCs are relatively monodispersed and spherical in shape. UV–Vis spectra indicate that the band gap of ZnSe NCs in acetone and ethanol is blue shifted comparing to the band gap of bulk ZnSe which is due to quantum confinement effect. According to the XRD results, TEM observations and UV–Vis spectroscopy, as-synthesized ZnSe NCs in ethanol are larger than the ones in acetone. Two kinds of band edge and deep level emissions are identified by means of the room temperature photoluminescence spectroscopy. |
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