It is universally known that the preparation of high quality graphene on a large scale and in a cost-effective manner is essential for many technological applications. Graphene oxide (GO) has emerged as the precursor ...It is universally known that the preparation of high quality graphene on a large scale and in a cost-effective manner is essential for many technological applications. Graphene oxide (GO) has emerged as the precursor of choice for bulk production of graphene-based materials, as it can be synthesized from inexpensive graphite powders. In this paper, a simple method is described for reduction of GO solution by a free and green irradiation based technique. The majority of oxygen-containing functional groups of GO are removed by sun light. This methodology provides an effective way to quantitatively produce high quality graphene sheets. This paper presents irradiation by sun light of synthesized graphene oxide nano-flakes prepared by Hummer’s method. These nano-flakes have been successfully reduced while the dynamic of this irradiation process is discussed. The irradiated nano-flakes of graphene oxide have been investigated using X-Ray diffraction, ATR-FTIR and UV-Vis-NIR.展开更多
Graphene is a single layer of carbon atoms arranged in a two dimension hexagonal lattice. It appeared very quickly that this exceptional material had truly outstanding electronic, mechanical, thermal and optical prope...Graphene is a single layer of carbon atoms arranged in a two dimension hexagonal lattice. It appeared very quickly that this exceptional material had truly outstanding electronic, mechanical, thermal and optical properties. The main goal of this work is the confinement of graphene nanosheets in an individual polymeric nanofiber and the study of their vibrational and thermal properties in one dimension. After their preparation, graphene sheets were mixed with Polyethylene oxide (PEO) solution to be electrospinned. The synthesized nanofibers were systematically investigated by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy measurements and their morphology and structure were characterized by atomic force microscopy (AFM), optical microscope and Scanning Electron Microscope (SEM) and finally thermogravimetric analysis (TGA) to check G/PEO mass ratio and interactions to prove the capability of PEO to be a good envelope for the confinement and the alignment of graphene nanosheets in a one dimensional system.展开更多
Graphene is a two-dimensional crystal of carbon atoms arranged in a honeycomb lattice. It is a zero band gap semimetal with very unique physical and chemical properties which make it useful for many applications such ...Graphene is a two-dimensional crystal of carbon atoms arranged in a honeycomb lattice. It is a zero band gap semimetal with very unique physical and chemical properties which make it useful for many applications such as ultra-high-speed field-effect transistors, p-n junction diodes, terahertz oscillators, and low-noise electronic, NEMS and sensors. When the high quality mass production of this nanomaterial is still a big challenge, we developed a process which will be an important step to achieve this goal. Atomic Force Microscopy, Scanning Electron Microscopy, Scanning tunneling microscopy, High Resolution Transmission Electron Microscopy, X-Ray Diffraction, Raman spectroscopy, Energy Dispersive X-ray system were investigated to characterize and examine the quality of this product.展开更多
文摘It is universally known that the preparation of high quality graphene on a large scale and in a cost-effective manner is essential for many technological applications. Graphene oxide (GO) has emerged as the precursor of choice for bulk production of graphene-based materials, as it can be synthesized from inexpensive graphite powders. In this paper, a simple method is described for reduction of GO solution by a free and green irradiation based technique. The majority of oxygen-containing functional groups of GO are removed by sun light. This methodology provides an effective way to quantitatively produce high quality graphene sheets. This paper presents irradiation by sun light of synthesized graphene oxide nano-flakes prepared by Hummer’s method. These nano-flakes have been successfully reduced while the dynamic of this irradiation process is discussed. The irradiated nano-flakes of graphene oxide have been investigated using X-Ray diffraction, ATR-FTIR and UV-Vis-NIR.
基金supported by USMBA,NanoAfNet and Technologia University
文摘Graphene is a single layer of carbon atoms arranged in a two dimension hexagonal lattice. It appeared very quickly that this exceptional material had truly outstanding electronic, mechanical, thermal and optical properties. The main goal of this work is the confinement of graphene nanosheets in an individual polymeric nanofiber and the study of their vibrational and thermal properties in one dimension. After their preparation, graphene sheets were mixed with Polyethylene oxide (PEO) solution to be electrospinned. The synthesized nanofibers were systematically investigated by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy measurements and their morphology and structure were characterized by atomic force microscopy (AFM), optical microscope and Scanning Electron Microscope (SEM) and finally thermogravimetric analysis (TGA) to check G/PEO mass ratio and interactions to prove the capability of PEO to be a good envelope for the confinement and the alignment of graphene nanosheets in a one dimensional system.
文摘Graphene is a two-dimensional crystal of carbon atoms arranged in a honeycomb lattice. It is a zero band gap semimetal with very unique physical and chemical properties which make it useful for many applications such as ultra-high-speed field-effect transistors, p-n junction diodes, terahertz oscillators, and low-noise electronic, NEMS and sensors. When the high quality mass production of this nanomaterial is still a big challenge, we developed a process which will be an important step to achieve this goal. Atomic Force Microscopy, Scanning Electron Microscopy, Scanning tunneling microscopy, High Resolution Transmission Electron Microscopy, X-Ray Diffraction, Raman spectroscopy, Energy Dispersive X-ray system were investigated to characterize and examine the quality of this product.
