فهرس المقالات Field Emission

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  1 - Properties of nanoscale copper oxide thin film deposited by plasma focus device
  Hasan Anousha
  10.30495/jtap.162245
  In this study a 2 kJ Mather type plasma focus device was employed to deposit copper oxide (CuO) nanoscale thin film at room temperature on the glass substrate. The anode of the device was made of copper alloys. A mixture of oxygen and argon (O2+Ar) gases was used as the أکثر

  In this study a 2 kJ Mather type plasma focus device was employed to deposit copper oxide (CuO) nanoscale thin film at room temperature on the glass substrate. The anode of the device was made of copper alloys. A mixture of oxygen and argon (O2+Ar) gases was used as the working gas for CuO deposition. CuO nanostructures were formed on the glass substrate by 25 shots at 9 cm above the anode and 0° angle with respect to the anode axis. According to the XRD results, the crystallite size of the CuO thin film is between 64 and 122 nm. FESEM images show that the growth nanostructures on the surface of the film are almost clusters with the average size of 80 nm. UV-Vis spectroscopy results indicate that the transmittance of the deposited CuO thin films in the UV region is very low. The bandgapenergy and refraction index of the film are 1.8 eV and 1.9, respectively. The IV diagram shows that as the applied voltage increases, the current intensity increases exponentially. Four-probe method shows that the electrical surface resistance of CuO thin film is in the range of 680 Ωcm, and their dc conductivity is about 13.2 S/m. تفاصيل المقالة
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  2 - Two efficient approaches for improving field emission properties of ZnO NRs
  Marziyeh Advand Bahram Azizollah Ganji Mohammad Reza Kolahdouz
  The structure of pure and Al doped ZnO (AZO) nanorods (NRs) has been studied. A post annealing procedure in oxygen ambience at 400ﹾC were used in order to improve crystallinity of both group of samples. The XRD patterns illustrate that the Al doped ZnO NRs were successf أکثر

  The structure of pure and Al doped ZnO (AZO) nanorods (NRs) has been studied. A post annealing procedure in oxygen ambience at 400ﹾC were used in order to improve crystallinity of both group of samples. The XRD patterns illustrate that the Al doped ZnO NRs were successfully synthesized using our method. Then, the field emission properties of the as grown NRs before and after annealing process were evaluated by our home-made setup. Experimental results show that Al density in ZnO NRs directly affects FE properties of these samples. The oxygen post annealing process leads to a significant improvement in the field emission performances of pristine and doped ZnO NRs including considerably lower turn on voltage, and higher emission current. تفاصيل المقالة