Document Details

Document Type : Thesis 
Document Title :
The Synthesis of Carbon-based Nanomaterials by Pulsed Laser Ablation in Liquids
تحضير مواد كربونية نانوية باستخدام نبضات الليزر في الوسط السائل
 
Subject : Faculty of Science 
Document Language : Arabic 
Abstract : Pulsed Laser Ablation in Liquid (PLAL) is considered as a robust and simple technique to produce nanomaterials. The carbon-based nanomaterials were fabricated via the PLAL technique by irradiating a graphite target with a pulsed Nd:YAG laser of wavelength 532 nm. The graphite target was immersed in distilled water and irradiated for 10 minutes. The pulse length, repetition rate, and fluence were 6 ns, 10 Hz, and 0.4 J⁄(cm^2,) respectively. The structural and physical properties of the synthesized carbon-based nanomaterials were investigated by different analysis methods. The TEM images revealed diverse carbon nanostructure such as nanospheres with a mean diameter of 50 ± 9 nm, nanospheres agglomerated in the shape of a necklace with a mean diameter of 60 ± 11 nm, nanotubes with a mean diameter of 21 nm and average length of 140 nm. However, the dominance was graphene nanosheets in multi layers. EDX spectra confirmed the synthesis of high purity carbon nanostructures with low oxygen concentration. XRD spectrum indicated the presence of carbon nanostructures with the appearance of a broad peak at 2 = 25o near the graphite peak of (002) plane. This peak is attributed to the formation of stacked layers of graphene nanosheets that are not stacked in an orderly fashion. The XRD results also confirmed the absence of Graphene Oxide (GO), however, it was transformed to reduced Graphene Oxide (rGO). The transmission UV-Vis analysis showed a strong trough at 266 nm which is attributed to the presence of carbon nanostructures. In addition, FTIR analysis showed the vibration bonds related to carbon. The nanostructures produced were semi-stable with little agglomeration as was inferred from the results of the Zeta Potential. Finally, the DLS analysis confirmed the TEM results that the majority (73%) of the sample were graphene nanosheets with average length of 575 nm and smaller portion (27%) were carbon nanospheres with average diameter of 58 nm. In this work, the PLAL technique is proved to be a simple method for producing carbon-based nanomaterials. Moreover, the results confirm that the fluence of the laser beam is an important factor that affects the type of nanostructures that could be synthesized during laser ablation. 
Supervisor : Dr. Reem M. Altuwirqi 
Thesis Type : Master Thesis 
Publishing Year : 1441 AH
2019 AD 
Co-Supervisor : Dr. Entesar Ali Ganash 
Added Date : Monday, November 18, 2019 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
غاليه احمد الجبرتيAl-Jabarti, Ghaliah AhmedResearcherMaster 

Files

File NameTypeDescription
 45169.pdf pdf 

Back To Researches Page