SYNTHESIS AND CHARACTERIZATION OF STRUCTURE AND OPTICAL PROPERTIES OF GRAPHENE OXIDE FROM BIOMASS ASSISTED BY ATMOSPHERIC PLASMA TECHNOLOGY
Graphene oxide (GO) is a form of graphene that contains more oxygen at the edges. GO is generally synthesized by the Hummer method at relatively low temperatures, but it utilizes damaging chemicals and requires a long synthesis process. Researchers from Rice University have introduced a novel tec...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/81632 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Graphene oxide (GO) is a form of graphene that contains more oxygen at the edges.
GO is generally synthesized by the Hummer method at relatively low temperatures,
but it utilizes damaging chemicals and requires a long synthesis process.
Researchers from Rice University have introduced a novel technique known as the
flash method. The high-temperature conditions in this method are generated by the
electrical discharge between two electrodes from a large capacitor bank, which
subsequently converts the material into graphene through a thermal process.
Laboratory-scale discoveries at the BRIN Plasma Centre have shown that a single
exposure to argon plasma can produce activated carbon in the graphite phase from
a random piece of wood, exhibiting conductive and even paramagnetic properties
due to the extremely high plasma temperature and inert atmosphere.
This study introduces a more effective and efficient method, as it can be performed
in a relatively short time, is cost-effective, and does not require the use of chemicals.
It utilizes biomass materials (coconut fronds, palm fronds, and rambutan stems) for
the synthesis of GO using atmospheric plasma. The morphological characteristics
of the samples exhibit a thin multi-layered structure with a hexagonal crystal
structure, as evidenced by SEM and TEM diffraction (SAED) analysis. SEM-EDS
analysis indicates that the carbon content in the samples exceeds 80%, which is
higher than the oxygen content. Raman spectroscopy analysis reveals structural
disorder with a D-band to G-band ratio of around 1. FTIR analysis confirms the
presence of carbon-oxygen bonds in the samples. GO exhibits unique optical
properties with a bandgap energy of around 2 eV and the ability to absorb and emit
light (photoluminescence) in the 400-900 nm wavelength range. Based on these
characteristics, biomass-derived graphene oxide after atmospheric plasma
treatment has potential applications in photonics, bioimaging, optical devices,
sensors, photodetectors, and as an additive in plastic scintillators.
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