研究目的
To investigate the effect of different synthesis methods on the properties of lithium-doped graphene oxide composites with tin oxide nanoparticles, aiming to achieve white luminescence and enhance applicability in optoelectronic devices.
研究成果
Composites of graphene oxide with undoped or Li-doped SnO2 nanoparticles show enhanced luminescence and nearly white emission, with synthesis method influencing structural and optical properties. In-situ routes promote higher synergetic effects and luminescence but less control over nanoparticle characteristics. Li doping further enhances luminescence and modifies composite properties, indicating potential for optoelectronic applications.
研究不足
The synthesis routes, especially in-situ methods, offer limited control over nanoparticle size and morphology, leading to wide size distributions. The low concentration of SnO2 nanoparticles in composites may affect luminescence contributions. Further analysis is needed to fully understand the luminescence mechanisms and achieve pure white emission.
1：Experimental Design and Method Selection:
The study employed two synthesis routes for composites: in-situ chemical synthesis (hydrolysis and hydrothermal methods) and ex-situ physical blending (ultrasonication). Methods included XRD, HRTEM, EDS, Raman, XPS, and PL for characterization.
2：Sample Selection and Data Sources:
Graphene oxide was synthesized using a modified Hummers' method. SnO2 nanoparticles (undoped and 10% Li-doped) were prepared by Liquid-Mix, hydrolysis, and hydrothermal methods. Composites were formed with a 3:1 weight ratio of GO to nanoparticles.
3：List of Experimental Equipment and Materials:
Equipment included Panalytical X'Pert Pro Alpha1 XRD, Leica 440 SEM, JEOL-3000F FEG HRTEM, Horiba Jobin-Yvon LabRam Hr800 confocal microscope with UV He-Cd and red He-Ne lasers, and XPS at Elettra Synchrotron. Materials included GO, SnO2 nanoparticles, and lithium precursors.
4：Experimental Procedures and Operational Workflow:
GO synthesis via Hummers' method. Nanoparticle synthesis by Liquid-Mix, hydrolysis, and hydrothermal methods. Composite preparation by in-situ addition of GO during nanoparticle synthesis or ex-situ blending. Characterization using XRD, HRTEM, SEM, Raman, XPS, and PL spectroscopy.
5：Data Analysis Methods:
XRD data analyzed with Scherrer's formula for crystallite size. Raman spectra deconvoluted using Voigt profiles. XPS spectra deconvoluted with Voigt functions after Shirley background subtraction. PL spectra analyzed for emission bands and chromaticity coordinates.
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