Journal: Scientific Reports

Article Title: Synthesis of diamond-like phase from graphite by ultrafast laser driven dynamical compression

doi: 10.1038/srep11812

Figure Lengend Snippet: ( a ) and ( b ) refer to the polycrystalline graphite (precursor). ( c ) and ( d ) correspond to the laser-modified surface, and in ( c ), the thicker red curve is the measured Raman spectrum and the gray ones are its component bands obtained from Voigt functions fittings. ( e ) and ( f ) present the measurements for the laser-created structure (the corresponding optical image is shown in the , which also shows the Raman spectra for two other laser created particles). Clear morphological differences are noted between the precursor and the laser modified materials. The raw graphite contains disordered and buckled flakes ( b ). In ( d ) the material features micrometer sized globular formations composed by nanometer sized structures. Stacked layers resulting from shockwaves dynamic compressed carbon produce the structure shown in ( e ).

Article Snippet: Micro Raman spectroscopy (Xplora Plus microscope from Horiba with laser excitation at 532 nm), Scanning Electron Microscopy (SEM, FEI Inspect 50F), and High Resolution Electron Microscopy (HREM, JEOL JEM 2100F) were used to characterize the precursor sample and the subsequent products of the laser irradiation.

Techniques: Modification

Journal: RSC Advances

Article Title: Oxide-assisted growth of scalable single-crystalline graphene with seamlessly stitched millimeter-sized domains on commercial copper foils †

doi: 10.1039/c8ra00770e

Figure Lengend Snippet: (a) Schematic of the CVD growth procedure. (b) The XRD measurements show that the Cu substrates before and after graphene growth are dominated by the (100) texture. (c) The EBSD results demonstrate an actual surface monocrystallization to the (111) texture for the Cu substrates. (d) An optical image for individual aHGDs grown for 60 min. (e) An SEM image for individual aHGDs grown for 30 min. (f) An OM image of a nearly continuous graphene film coalesced by aHGDs. The exposed Cu surfaces (dark orange areas) confirm the alignment of coalesced aHGDs. (g) Typical Raman spectrum of aHGDs indicates the monolayer nature and high quality of the sample.

Article Snippet: The characterizations of graphene were carried out by SEM (3 kV, S-3400, Hitachi Co., Ltd.), XRD (X'Pert PRO, PANalytical Co., Ltd.), micro-Raman spectroscopy (532 nm wavelength excitation laser, LabRAM HR Evolution, Horiba Co., Ltd.), OM (yellow light by Shanghai 8XB-PC from Shanghai Optical Instrument Factory and blue light by Olympus BXFM-ILHS from Olympus Co., Ltd), EBSD using scanning auger electron spectroscopy (AES, PHI-710, ULVAC-PHI Inc.), AFM (Multimode 8 system equipped with a silicon probe SNL-10 from Bruker Co., Ltd.), and high-resolution AFM/STM (NT-MDT spectrum Instruments).

Techniques:

Journal: RSC Advances

Article Title: Oxide-assisted growth of scalable single-crystalline graphene with seamlessly stitched millimeter-sized domains on commercial copper foils †

doi: 10.1039/c8ra00770e

Figure Lengend Snippet: The OM image and scanning Raman spectroscopy results for the G, 2D, and D bands for an aHGD transferred onto the SiO 2 /Si substrate. Scale bars: 100 μm.

Article Snippet: The characterizations of graphene were carried out by SEM (3 kV, S-3400, Hitachi Co., Ltd.), XRD (X'Pert PRO, PANalytical Co., Ltd.), micro-Raman spectroscopy (532 nm wavelength excitation laser, LabRAM HR Evolution, Horiba Co., Ltd.), OM (yellow light by Shanghai 8XB-PC from Shanghai Optical Instrument Factory and blue light by Olympus BXFM-ILHS from Olympus Co., Ltd), EBSD using scanning auger electron spectroscopy (AES, PHI-710, ULVAC-PHI Inc.), AFM (Multimode 8 system equipped with a silicon probe SNL-10 from Bruker Co., Ltd.), and high-resolution AFM/STM (NT-MDT spectrum Instruments).

Techniques: Raman Spectroscopy