Femtosecond Laser Interaction with Graphene Oxide Aqueous Solution
dc.contributor.author | Ibrahim, Khaled | |
dc.date.accessioned | 2015-09-23T12:39:03Z | |
dc.date.available | 2015-09-23T12:39:03Z | |
dc.date.issued | 2015-09-23 | |
dc.date.submitted | 2015-09-04 | |
dc.description.abstract | In this study fs pulsed laser of wavelength 800 nm was used to reduce two sets of aqueous graphene oxide solution namely low (0.5 mg/mL) and high concentration (6.2 mg/mL). It was found that after fs laser treatment the surface roughness of the graphene oxide flakes was reduced by 95.6% and 66% for the high and low GO concentration films respectively. It was also found that the resistivity of high concentration (6.2 mg/ml) rGO films was enhanced by 4 orders of magnitude as a result of the laser treatment which could raise the electron mobility of the rGO films close to that of pristine graphene films. The C-O atomic ratio for the high concentration graphene oxide samples was found to increase by 3 times after 6 hrs of laser treatment. A novel technique of graphene oxide sol-gel (GOSG) fabrication was introduced where GOSG was obtained by placing the laser focal point at the solution/air interface. By manipulating the exposure parameters such as the ablated volume, laser energy and focal length, the GOSG was obtained at various times in the range of as 8 min to 7 hrs. The chemical analysis (XPS) revealed the reduction of the COOH molecules as a result of the exposure process, which is due to removing the OH- from the GO sheets and vaporization of the water content within the solution. Surface morphology analysis using AFM and SEM showed that all GOSG thin films except the 7 hrs one depicted a high surface roughness and porous surface area with randomly stacked graphene oxide layers. However, a smooth stacking layered structure and the smallest average surface roughness was observed in the 7 hrs GOSG, which was pertained the behavior of pure graphene as proved by the FTIR analysis. | en |
dc.identifier.uri | http://hdl.handle.net/10012/9695 | |
dc.language.iso | en | en |
dc.pending | false | |
dc.publisher | University of Waterloo | |
dc.subject | Graphene oxide | en |
dc.subject | Graphene oxide gel | en |
dc.subject | Graphene | en |
dc.subject | Femtosecond laser | en |
dc.subject | Material Science | en |
dc.subject | Reduced graphene oxide | en |
dc.subject | Microscope | en |
dc.subject | FTIR | en |
dc.subject | UV Visible | en |
dc.subject | XRD | en |
dc.subject | Raman spectrometer | en |
dc.subject.program | Mechanical Engineering | en |
dc.title | Femtosecond Laser Interaction with Graphene Oxide Aqueous Solution | en |
dc.type | Master Thesis | en |
uws-etd.degree | Master of Applied Science | en |
uws-etd.degree.department | Mechanical and Mechatronics Engineering | en |
uws.peerReviewStatus | Unreviewed | en |
uws.scholarLevel | Graduate | en |
uws.typeOfResource | Text | en |