Morphological, size-dependent field emission investigation of GO and rGO nanosheet
DOI:
https://doi.org/10.62638/ZasMat1069Abstract
Here, we report the role of surface morphologies and grain size on the electron field emission characteristics of GO and rGO nanosheets, synthesized through a modified Hummer's method. Plasmon peaks were observed at 290 nm to 310 nm for both samples. A plasmonic energy-associated effective mass model was used to calculate the crystal size of the nanosheets, which was found to be 3.56 nm and 4.79 nm for GO and rGO, respectively, confirming confinement behavior. Raman spectroscopy data recorded for GO and rGO nanosheets confirmed the presence of D and G bands, indicating the successful growth of both GO and rGO. Additionally, the crystal size calculated from the Raman data is comparable to the Bohr exciton radius, suggesting that GO and rGO exhibit quantum dot-like behavior. The electron field emission parameters of the synthesized GO and rGO nanosheets were investigated, and the parameters were calculated using the Fowler–Nordheim (F-N) equation. Among the samples, the GO nanosheets exhibited the best electron field emission properties, with a minimum turn-on voltage of 8.2 V/μm and a field enhancement factor of 1200, attributed to the smallest emitter tip radius and the varying surface morphologies.
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