期刊
MATERIALS
卷 14, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/ma14030590
关键词
graphene; SiC; sublimation; Auger and Raman spectroscopies; Green-function method; graphene gas sensor; grapheme biosensor
This work focuses on the development and optimization of graphene-based sensors, successfully growing single-layer graphene films on semi-insulating 6H-SiC substrates with high sensitivity detection of NO2 concentration. The sensor structure was formed on the graphene film and tested for detection of protein molecules.
This work is devoted to the development and optimization of the parameters of graphene-based sensors. The graphene films used in the present study were grown on semi-insulating 6H-SiC substrates by thermal decomposition of SiC at the temperature of similar to 1700 degrees C. The results of measurements by Auger and Raman spectroscopies confirmed the presence of single-layer graphene on the silicon carbide surface. Model approach to the theory of adsorption on epitaxial graphene is presented. It is demonstrated that the Green-function method in conjunction with the simple substrate models permit one to obtain analytical results for the charge transfer between adsorbed molecules and substrate. The sensor structure was formed on the graphene film by laser. Initially, a simpler gas sensor was made. The sensors developed in this study demonstrated sensitivity to the NO2 concentration at the level of 1-0.01 ppb. The results obtained in the course of development and the results of testing of the graphene-based sensor for detection of protein molecules are also presented. The biosensor was fabricated by the technology previously developed for the gas sensor. The working capacity of the biosensor was tested with an immunochemical system constituted by fluorescein and monoclonal antibodies (mAbs) binding this dye.
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