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Surface-enhanced Raman scattering of reduced graphene coated with silver nanoparticles
Shivi Rathore,Dinesh Kumar Patel,Po-Da Hong 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Recently carbon based materials such as graphene and silver nanoparticles hybrid become very important for a variety of applications including bio-medical, waste water treatment, solar energy, chemical sensors, electronics etc. We have studied the Surface Enhanced Raman Spectroscopy (SERS) of reduced graphene oxide modified with silver nanoparticles. First, graphene oxide was synthesized by oxidation of graphite powder using KMnO4, NaNO3, H2SO4 and H2O2 and then silver nitrate along with graphene oxide were reduced chemically using Hydrazine Hydrate and the mixture is known as graphene- silver NPs hybrid. The structural and morphological properties of prepared samples were characterized by means of scanning electron microscope (SEM), UV-visible spectroscopy and Raman spectroscopy. We found that the D peak, G peak and 2D peak intensity of Raman spectra has been amplified many times with silver nanoparticles as well as silver nanoparticles intercalate between the layers of graphene oxide, therefore it is also helpful in reduction of graphene oxide.
Chuang Wei-Tsung,Jeng U-Ser,Sheu Hwo-Shuenn,Hong Po-Da The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.1
We conducted simultaneous, small-angle, X-ray scattering/differential scanning calorimetry (SAXS/DSC) and simultaneous, wide-angle, X-ray scattering (WAXS)/DSC measurements for a polymer blend of poly($\varepsilon$-caprolactone)/poly(ethylene glycol)(PCL/PEG). The time-dependent SAXS/DSC and WAXS/DSC results, measured while the system was quenched below the melting temperature of PCL from a melting state, revealed the competitive behavior between liquid-liquid phase separation and crystallization in the polymer blend. The time-dependent structural evolution extracted from the SAXS/WAXS/DSC results can be characterized by the following four stages in the PCL crystallization process: the induction (I), nucleation (II), growth (III), and late (IV) stages. The influence of the liquid-liquid phase separation on the crystallization of PCL was also observed by phase-contrast microscope and polarized microscope with 1/4$\lambda$ compensator.