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Alfa Chemistry offers quality assurance testing services to analyze and characterize the structure and quality of graphene and graphene-based devices, such as transmission electron microscopy, energy dispersive X-ray analysis, Raman spectroscopy, etc.
Since the discovery of graphene and its mechanized production, the application of graphene in different scientific fields has exploded. The main challenge now is to produce sufficient high-quality graphenes to develop applications for daily life. The quality of graphene varies with production conditions, so manufacturers need reliable structure and quality feedback to optimize the process. Downstream users also need tools to evaluate the quality of incorporating graphene into related products.
Instrument platform: SEM/TEM
Through the high-resolution electron microscopy, graphene's layered structure can be clearly evaluated.
Instrument platform: AFM/TEM/Raman/STM/Optical microscope
Atomic force microscope can effectively measure the thickness of graphene. Transmission electron microscopy can estimate the number and size of graphene sheets with the help of high-resolution electron micrographs at the edges or wrinkles of graphene. In the range of few layers, Raman spectroscopy can be used to quickly and accurately determine the number of graphene layers. Scanning tunneling microscope is one of the earliest instruments used to characterize the structure of graphene. Optical microscopy is an effective method to quickly and simply characterize the number of graphene layers.
Instrument platform: Raman
A series of methods such as doping with boron or nitrogen and chemical modification will introduce defects to graphene, which will have a great impact on its electrical performance and device performance. Raman spectroscopy has unique advantages(G/D and G/G' ratios) in characterizing the defects of graphene materials.
Instrument platform: UV/IR/XPS/TGA
Graphene oxide is rich in various oxygen-containing groups. Determining the oxidation degree of graphene oxide is the basis for its modification. Alfa Chemistry uses infrared spectroscopy, ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy and thermogravimetric analysis to qualitatively and quantitatively analyze the oxygen content of graphene.
Instrument platform: XPS/ICP-OES/ICP-MS/EDS
XPS can determine the ratio of sp2/sp3 carbon, quantify the surface chemical modification, and measure the reduction of graphene oxide in addition to the determination of elements. ICP-OES can accurately (batch) determine the specified elements. ICP-MS can simultaneously semi-quantitatively determine more than 70 elements.
