Abstract
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 ~1700 °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.
Highlights
The discovery of graphene and the study of its properties is one of the brightest pages in the development of solid-state physics over the past 15 years
Graphene films obtained by thermal destruction of the surface of silicon carbide are the second in terms of structural perfection
The advent of graphene opened a new page in solid state physics—the production and study of two-dimensional materials
Summary
The discovery of graphene and the study of its properties is one of the brightest pages in the development of solid-state physics over the past 15 years. Graphene samples obtained by this technology have had the best structural perfection It was on these samples that the most important results were obtained, which confirmed the two-dimensional nature of this material. Their small size and irregular and unpredictable geometrical shape in advance do not allow the exfoliation method in industry. Graphene films obtained by thermal destruction of the surface of silicon carbide are the second in terms of structural perfection. High mobility of charge carriers in combination with their low concentration; The maximum possible ratio of surface area to volume; Low noise level The combination of these properties leads to the fact that the addition of a minimal amount of impurity to the graphene surface can noticeably change the conductivity of the graphene film. New results obtained by detecting various types of biological molecules with a graphene sensor are analyzed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
