研究目的
Investigating the electrical and optical properties of graphene quantum dots (GQDs) prepared by different numbers of wet transfer to optimize their density and uniformity for improved performance.
研究成果
The study demonstrates that wet transfer is an efficient method to improve the density and uniformity of GQDs, with the number of wet transfers significantly affecting their electrical and optical properties. The specimen with 2 wet transfers exhibited the lowest resistivity and the second highest transmittance, indicating optimal performance. GQDs can significantly reduce resistivity compared to substrates without GQDs, highlighting their potential for optoelectronic applications.
研究不足
The study is limited by the potential for defects and cracks during the wet transfer process, which could affect the uniformity and quality of GQDs. Additionally, the scalability of the wet transfer method for large-scale applications may pose challenges.
1:Experimental Design and Method Selection:
GQDs were grown on copper foil substrates using CVD synthesis, followed by wet transfer onto glass substrates with varying numbers of transfers (1-3) to study their effects on GQDs' properties.
2:Sample Selection and Data Sources:
Copper foil substrates were cleaned and used for GQD growth. Optical and electrical properties were measured post-transfer.
3:List of Experimental Equipment and Materials:
CVD system (HORNG YIH, HG-120), spin coater (Tekstarter, MSC-300D), Rapid Thermal Annealing (RTA) chamber (ULVAC, RHL-610CP), Raman spectroscopy (ProTrusTech, MRI1532S), HR-TEM (JEOL, JEM-2100F), XRD (Bruker AXS Gmbh, D2 phaser), UV–Visible-NIR spectrophotometer (HITACHI, UV-4100), micro-Raman spectroscopy (ULVAC, Labram HR), Hall effect analyzer (Maechchannel, AHM-900B), XPS (ULVAC, PHI-5000).
4:0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: GQDs were grown on copper foil, transferred to glass substrates using PMMA as a support layer, and characterized for their optical and electrical properties.
5:Data Analysis Methods:
Raman spectra, TEM images, XRD patterns, and electrical measurements were analyzed to determine the effects of wet transfer numbers on GQDs' properties.
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HR-TEM
JEM-2100F
JEOL
Used to observe the microstructures, elemental categories, and lattice orientations of GQDs.
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UV–Visible-NIR spectrophotometer
UV-4100
HITACHI
Used to measure optical properties including absorption, transmittance, and reflection.
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CVD system
HG-120
HORNG YIH
Used for the synthesis of graphene quantum dots on copper foil substrates.
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Spin coater
MSC-300D
Tekstarter
Used to apply PMMA uniformly over the GQDs/copper foil substrate.
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Rapid Thermal Annealing (RTA) chamber
RHL-610CP
ULVAC
Used for annealing the specimens under vacuum to remove PMMA residues.
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Raman spectroscopy
MRI1532S
ProTrusTech
Used to characterize the quality of graphene materials.
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XRD
D2 phaser
Bruker AXS Gmbh
Used to detect crystalline directions of the copper foil.
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micro-Raman spectroscopy
Labram HR
ULVAC
Used to investigate photoluminescence.
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Hall effect analyzer
AHM-900B
Maechchannel
Used to measure electrical properties including carrier concentration, mobility, and resistivity.
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XPS
PHI-5000
ULVAC
Used to identify chemical bonding in GQDs.
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