کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5364363 | 1388315 | 2011 | 4 صفحه PDF | دانلود رایگان |
The synthesis of ZnO nanocrystals is reported using a hydrothermal chemical growth technique combined with 248Â nm nanosecond excimer laser heating at fluences in the range 0-390Â mJÂ cmâ2. The effect of laser heating in controlling the morphology of the nanocrystals is investigated using optical spectroscopy and electron microscopy characterization. Laser heating is shown to allow control of the crystal morphology from nanoparticles to nanorods as well as to modify the size distributions. The results indicate that not only does the laser accelerate the growth of nanocrystals, but can also produce crystals with a narrow size distribution possibly via photothermal size selection. An initial study of electrical conduction properties of ZnO nanocrystal thin films is also discussed.
Research highlightsⶠAn excimer laser has been used on the traditional hydrothermal growth of ZnO. ⶠThe laser is used in order to accelerate the process as well as to control the morphology. ⶠThe morphology is observed to be dependent upon the laser fluence. The fluence is also seen to control the size distribution ⶠNarrow size distributed ZnO nanocrystals have been achieved using a fluence of 330 mJ cmâ2.
Journal: Applied Surface Science - Volume 257, Issue 12, 1 April 2011, Pages 5274-5277