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Properties of Zinc Oxide Nanoparticles Synthesized by Electrical Discharge Technique in Liquids
|Nikolai V. Tarasenko , Alena A. Nevar , Mikhail I. Nedelko , Dmitri A. Lopatik|
The capabilities of plasma assisted technique based on electrical discharge in liquids for synthesis of N-doped and In-N codoped ZnO nanocrystals and fabrication of p-type ZnO have been analyzed. The synthesis was carried out in a reactor containing the aqueous ammonium nitrate solution of 0.01M concentration. The pulsed spark discharges between Zn-Zn and Zn-In electrodes have been used. The diameter of the rod electrodes was 6 mm and the gap distance between the electrodes was several hundreds micrometers. The discharge was initiated by applying a high-frequency voltage of 3.5 kV with a repetition rate of 100 Hz. The peak current of the discharge was 60 A with a pulse duration of 30 μs.
The optical properties, morphology and composition of the nanoparticles formed were investigated by means of UV/VIS absorption spectroscopy, TEM and XRD. Optical absorption spectra of as-prepared colloidal solutions exhibited a broad absorption band edge in the UV spectral range. For a better crystallinity and lower electronic conduction, undoped ZnO showed the highest transmittance. There was a distinct red shift for the doped ZnO samples at the sharp fundamental absorption edge as compared with the undoped ZnO particles.
As it followed from the XRD patterns the synthesized product was composed of hexagonal ZnO nanocrystals. The position of the reflection peaks were observed to be varied with the composition of dopants. The influence of doping level on the electrical and optical properties of synthesized nanoparticles has been discussed.
Presentation: Poster at E-MRS Fall Meeting 2009, Symposium C, by Nikolai V. Tarasenko
See On-line Journal of E-MRS Fall Meeting 2009
Submitted: 2009-05-11 17:20 Revised: 2009-06-07 00:48