SEM and Raman analysis of graphene on SiC(0001)

Grodecki, K.; Jóźwik, I.; Baranowski, J. M.; Teklińska, Dominika; Strupiński, Włodek

doi:10.1016/j.micron.2015.05.013

Cited by 31 publications

(19 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…FIB allowed to obtain chemically unchanged, perfectly polished surfaces for subsequent analysis. The application of EsB detector at low acceleration voltage clearly showed even the slightest differences in the composition [25]. …”

Section: Focused Ion Beam-scanning Electron Microscopymentioning

confidence: 98%

Biphasic Polyurethane/Polylactide Sponges Doped with Nano-Hydroxyapatite (nHAp) Combined with Human Adipose-Derived Mesenchymal Stromal Stem Cells for Regenerative Medicine Applications

et al. 2016

View full text Add to dashboard Cite

Cartilage and bone tissue injuries are common targets in regenerative medicine. The degeneration of cartilage tissue results in tissue loss with a limited ability to regenerate. However, the application of mesenchymal stem cells in the course of such condition makes it possible to manage this disorder by improving the structure of the remaining tissue and even stimulating its regeneration. Nevertheless, in the case of significant tissue loss, standard local injection of cell suspensions is insufficient, due to the low engraftment of transplanted cells. Introduction of mesenchymal stem cells on the surface of a compatible biomaterial can be a promising tool for inducing the regeneration by both retaining the cells at the desired site and filling the tissue gap. In order to obtain such a cell-biomaterial hybrid, we developed complex, biphasic polymer blend biomaterials composed of various polyurethane (PU)-to-polylactide (PLA) ratios, and doped with different concentrations of nano-hydroxyapatite (nHAp). We have determined the optimal blend composition and nano-hydroxyapatite concentration for adipose mesenchymal stem cells cultured on the biomaterial. We applied biological in vitro techniques, including cell viability assay, determination of oxidative stress factors level, osteogenic and chondrogenic differentiation potentials as well as cell proteomic analysis. We have shown that the optimal composition of biphasic scaffold was 20:80 of PU:PLA with 20% of nHAp for osteogenic differentiation, and 80:20 of PU:PLA with 10% of nHAp for chondrogenic differentiation, which suggest the optimal composition of final biphasic implant for regenerative medicine applications.

show abstract

Section: Focused Ion Beam-scanning Electron Microscopymentioning

confidence: 98%

Biphasic Polyurethane/Polylactide Sponges Doped with Nano-Hydroxyapatite (nHAp) Combined with Human Adipose-Derived Mesenchymal Stromal Stem Cells for Regenerative Medicine Applications

et al. 2016

View full text Add to dashboard Cite

show abstract

“…SEM is also used for characterizations of the growth of graphene on SiC [63]. Because of its atomic thickness, graphene is usually detected with secondary electrons which probe only a sample surface.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…These modes are used to study crystal structures, X-rays are used for determining chemical composition, and visible light with a monochromator can be used for cathodoluminescence (CL). SEM is also used for characterizations of the growth of graphene on SiC [63]. Because of its atomic thickness, graphene is usually detected with secondary electrons which probe only a sample surface.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…Because of its atomic thickness, graphene is usually detected with secondary electrons which probe only a sample surface. With SEM imaging, different contrast can be observed, such as thickness, roughness, and edge contrast; the brighter area shows the thinner part of the graphene layers [63]. The roughness contrast of a graphene layer is due to the different numbers of secondary electrons detected.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

See 1 more Smart Citation

Epitaxial Graphene on SiC: A Review of Growth and Characterization

2016

View full text Add to dashboard Cite

This review is devoted to one of the most promising two-dimensional (2D) materials, graphene. Graphene can be prepared by different methods and the one discussed here is fabricated by the thermal decomposition of SiC. The aim of the paper is to overview the fabrication aspects, growth mechanisms, and structural and electronic properties of graphene on SiC and the means of their assessment. Starting from historical aspects, it is shown that the most optimal conditions resulting in a large area of one ML graphene comprise high temperature and argon ambience, which allow better controllability and reproducibility of the graphene quality. Elemental intercalation as a means to overcome the problem of substrate influence on graphene carrier mobility has been described. The most common characterization techniques used are low-energy electron microscopy (LEEM), angle-resolved photoelectron spectroscopy (ARPES), Raman spectroscopy, atomic force microscopy (AFM) in different modes, Hall measurements, etc. The main results point to the applicability of graphene on SiC in quantum metrology, and the understanding of new physics and growth phenomena of 2D materials and devices.

show abstract

“…All the SEM images were obtained with a primary electron beam of 2 keV, because the formation of buffer layer and graphene on SiC substrates are easily distinguished by low-voltage SEM contrasts [11,23,24]. Ex situ micro probe Raman spectroscopy was also carried out for graphene and buffer layer evaluation before and after the selective oxygen etching.…”

Section: Methodsmentioning

confidence: 99%

<i>In Situ </i>Study on Oxygen Etching of Surface Buffer Layer on SiC(0001) Terraces

Wang

Nakahara

Saito

2017

e-J. Surf. Sci. Nanotech.

View full text Add to dashboard Cite

Thermal decomposition of SiC has been used for the fabrication of high quality monolayer graphene and graphene nanoribbons on semi-insulating substrates. In this work, we propose a selective oxygen etching method to remove buffer layers on SiC surfaces that are connected to monolayer graphene formed from step edges. A thermal treatment in an extreme low partial pressure oxygen diluted by argon atmosphere was found to be effective to etch only the buffer layers and remain monolayer graphene areas intact, which might be significant for the application of graphene to electric/spintronic devices. The etching processes of surface buffer layer investigated by in situ scanning electron microscopy and scanning tunneling microscopy revealed an etching rate dependence on a distance from a step edges, suggesting a distribution of crystallinity of surface buffer layer on a terrace.

show abstract

SEM and Raman analysis of graphene on SiC(0001)

Cited by 31 publications

References 13 publications

Biphasic Polyurethane/Polylactide Sponges Doped with Nano-Hydroxyapatite (nHAp) Combined with Human Adipose-Derived Mesenchymal Stromal Stem Cells for Regenerative Medicine Applications

Biphasic Polyurethane/Polylactide Sponges Doped with Nano-Hydroxyapatite (nHAp) Combined with Human Adipose-Derived Mesenchymal Stromal Stem Cells for Regenerative Medicine Applications

Epitaxial Graphene on SiC: A Review of Growth and Characterization

<i>In Situ </i>Study on Oxygen Etching of Surface Buffer Layer on SiC(0001) Terraces

Contact Info

Product

Resources

About