Title: Biosensors based on novel material field effect transistors
Language: English
Authors: Fleckl, Gernot 
Qualification level: Diploma
Advisor: Keplinger, Franz 
Issue Date: 2016
Number of Pages: 48
Qualification level: Diploma
For different purposes, state-of-the-art antigen detection mechanisms like ELISA are not sufficient in accuracy. Therefore, new approaches have to be developed to get highly sensitive technologies. Graphene's outstanding electrical properties, like ultrahigh charge mobility and sensitivity to dopants, make it to a promising candidate for new electronic devices and their utilization for sensing technologies. Recent progress in nanotechnology has enabled new possibilities and, thus, has allowed the construction of graphene field effect transistors (gFET). In this work, gFET arrays with high yield and good device-to-device characteristic have been fabricated. Siliconoxide (SiO2) and aluminiumoxide (Al2O3) have been used as insulating oxide layers. To utilize the gFET device, a chemical linker was attached by PI-PI stacking interactions. The liker himself binds antibody fragments, so called single chain variable fragments (scFv). In this approach, detection of HER3, a well known breast cancer biomarker, was of interest. Therefore, matching HER3 immunoglobulin G-antigen complexes were used. Conclusions about the concentration of HER3 antigens down to as small as ng/ml were deducible by monitoring the Dirac voltages of the gFET devices.
Keywords: Graphen; FET; CVD; PI-PI Stacking; Biosensor
Graphene; FET; CVD; PI-PI Stacking; Biosensor
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-3997
Library ID: AC13247441
Organisation: E366 - Institut für Sensor- und Aktuatorsysteme 
Publication Type: Thesis
Appears in Collections:Thesis

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