Wednesday, 09 October 2019 06:29
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Noor Malik Saadoun, a graduate student, optained her Ph.D. from the Department of Applied Sciences at University of Technology for her thesis entitled "Using LIBS for different metal detection " at the hall of the deceased Prof. Dr. Abdul Muttalib Ibrahim Al-Sheikh in the department.

The discussion committee, consisted of  Prof. Dr. Mohamed Rady Mohamed  as apresdent  ,. Prof. Dr.  Evan Tariq Salem., Dr. Kadhim Abdul Wahid Aadm,M.D. Raad Azawi Khamis. Dr. Qusay Adnan Abbas  as members and Dr. Sabah Habib Sbeih supervisor and Dr. Naseer Mahdi Hadi co-supervisor.

The studying included, metallic nanoparticle was fabricated by an efficient and size – controlled. Many parameters have been studied and structural properties were investigated and analyzed. Structure and surface morphology of Nanoparticles were characterized by X-ray diffraction. Atomic Force Microscope and Scanning and Electron Microscopy measurements.

Annealing was in air at a specifics temperature of (400) ̊ C and at a constant time of (75 min); the XRD for cu - NPs technique that showed these films is monoclinic structure with a preferred orientation. Lattice parameters are a = 4.84 Å, b = 3.47 Å and C = 5.33 Å. Corresponding to plane (002) and (111) , (222) ,(113) the XRD profile of Al-NPs  was shown with  diffraction peaks of (111, 200, 220 , 311), where the peaks at 111 and 200 were the most intense. The estimated average size corresponding to the most intense crystallographic plane (111) was determined to be 40 nm. The AFM Analysis suggested the size of Al-NPs as 45 nm . Four sharp peaks appeared at 2θ = 38.5°, 44.7°, 64.7°, and 77.6°, which can be assigned to the (111), (200), (220), and (311) planes of the face centered cubic (FCC) structure of metallic silver.

In the second part for diagnosis the metal sample for (Al, Ag Cu )  emission spectroscopy with different laser energy  of ( 81.5,134.5,221 , 240 and 319) mj with a specific distance between the fiber optic and the  target with 5mm ,  where the experiment was in air. Identification for emission spectrum line was analyzed based on  the NIST data base.

It is noticed that the intensity of spectrum lines, which is in (a.u) , increases with laser energy increase; in addition,  the plasma parameter for electron temperature and electron density number also increase that for bulk material .

For the enhancement of the LIBS technique we diagnosis the nanoparticles emission spectroscopy and calculated the plasma parameters. it was found the intensity increases   in different values higher than for bulk material with the same position for peaks , plasma parameter also increases  for electron temperature also reached to saturation value but the values electron density number decrease for NE-LIBS.

It is mentioned that the scientific expert of the thesis, is Prof. Dr. Alya Mohsen and the linguistic expert is Prof. Dr. Omar Farouk Lutfi.

 

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