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Carbon based dots (CDs) have attracted broad attention exhibit due to the unique optical properties. However, the exact origins of their optical properties are still controversial. Citric acid (CA) coupled with some amino group-containing small molecules are believed to be ideal precursors for the synthesis of high luminescent CDs through various thermal treatment processes. Herein, CA coupled with...
The development of environment-friendly electrode materials is highly desired for the clean and sustainable Li-ion batteries (LIBs) system. Organic cathode materials that involve conducting polymers, organic carbonyl/sulfur compounds are expected to be promising candidates for future LIBs with a concept of “green and sustainable”. However, their battery performances are relatively worse than that...
Single-walled carbon nanotubes (SWCNTs) have been used to prepare single-layered graphene quantum dots (GQDs) through a simple and green hydrothermal etching method. After the characterization of products and intermediates with scanning electronic microscopy, Raman and FTIR, a possible mechanism has been proposed for the formation of GQDs. The treatment of SWCNTs has resulted in two kinds of GQDs...
To explore the role of the interaction between the adsorbed molecules and substrates for the charge transfer (CT) induced Raman enhancement, we systematically study the surface enhanced Raman scattering (SERS) on graphene, graphene oxide (GO) and reduced graphene oxide (r-GO) using rhodamine 6G (R6G) as the probe molecule. The Raman spectra of R6G molecules deposited on these three SERS substrates...
By tuning substrate temperatures in a thermal deposition process, Au nanostructures with different morphologies, such as polygons, dendrites, irregular islands and dense clusters have been obtained on graphene surface. The surface-enhanced Raman scattering (SERS) of graphene caused by gold decoration is systematically investigated. The enhancement factor of graphene G band and the extent of G band...
The shape transformation of gold directly on graphene has been well studied by thermally annealing gold-deposited graphene samples at the temperature range from 600 to 800°C. We find that few-layer graphene can be served as a platform to transform a gold film into mainly hexagonal gold nanoparticles (AuNPs) at 600 or 700°C, or coexistence of hexagonal and triangular AuNPs at 800°C. Especially, the...
By white light contrast spectroscopy, we have successfully identified number of graphene oxide (GO) layers (⩽10 layers) and obtained a new refractive index of GO sheets (⩽10 layers) of n GO =1.2–0.24i. For few layers (⩽10 layers) GO sheets, both the contrast at ∼580nm wavelength and the Raman intensity of G band linearly increase with the increase of the layer numbers. However, due to the...
In Raman spectroscopy investigations of defective suspended graphene, splitting in the D band is observed. Four double resonance Raman scattering processes: the outer and inner scattering processes, as well as the scattering processes with electrons first scattered by phonons (“phonon-first”) or by defects (“defect-first”), are found to be responsible for these features of the D band. The D sub-bands...
Doping effects on exfoliated graphenes induced by methyl orange (MO) have been studied by spatially resolved Raman spectroscopy. When the MO molecules were adsorbed on the top of graphenes, the charge transfer between them caused two outcomes simultaneously. One is the strong chemical doping in graphenes and the other is the enhanced Raman signals of MO molecules. Our finding provides a potential...
We present the electronic structure evolution from graphite oxide to thermally reduced graphite oxide. Most functional groups were removed by thermal reduction as indicated by high resolution X-ray photoelectron spectroscopy, and the electrical conductivity increased 6 orders compare with the precursor graphite oxide. X-ray absorption spectroscopy reveals that the thermally reduced graphite oxide...
The microstructures of mesoporous carbon nanofibers were characterized by scanning electron microscopy, transmission electron microscopy, nano-Raman, nitrogen adsorption–desorption and optical transmission. They possessed a high specific surface area 840m 2 g −1 and a 1.07eV band gap. All mesoporous carbon nanofiber network can act as the channel material in p-type field-effect transistor...
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