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Graphene dopamine biosensor and gate effect
Krajíčková, Kateřina ; Šimšíková, Michaela (referee) ; Bartošík, Miroslav (advisor)
This bachelor’s thesis focuses on investigating the interaction between biochemical substances (dopamine solutions) and graphene, using field effect transistor (FET) based sensors. Graphene possesses unique properties, including biocompatibility, high charge carrier mobility, and surface sensitivity, making it an ideal material for biosensing devices. In these sensors, graphene is employed as the conductive sensing channel within fieldeffect transistors. By utilizing sensors with an FET arrangement, the doping of graphene induced by adsorbed atoms or molecules can be experimentally determined through the observation of the shift in the position of the Dirac point. The measurements can be performed using either the bottom-gated or electrolytic top-gated configuration of the FET sensor, and the thesis explores the differences between the two setups. Furthermore, it investigates the impact of the distance between the graphene and top-gate electrode on the sensor’s response. The results of these measurements are represented by transfer curves, which exhibit characteristic peaks indicating the charge neutrality point, known as the Dirac point, of graphene.
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Spider diversity research in relation to habitat conservation management.
Krajíčková, Kateřina ; Opatová, Věra (advisor) ; Dolejš, Petr (referee)
Spiders are a cosmopolitan and highly diversified group of invertebrates that play a very important role in the ecosystem. Thanks to their ubiquity in anthropogenic and economic ecosystems, we can consider them a suitable group that can be used for biological protection needs. Spider venoms and their silks also have potential uses in biotechnology in the future. Today, however, spiders face many threatening factors, including climate change, habitat loss, pesticides, acid rain, and other introduced invertebrate species. Spider conservation is currently addressed in several ways, using regional instruments such as the Bern Convention, the Habitat Directive and the IUCN Red List of Endangered Species. However, in the EU in particular, there is a lack of efforts to protect them not only in terms of evaluation but also in terms of regional and national legislation. However, the fact that they may be located in protected areas, such as national parks or protected landscape areas, also helps to protect them, which greatly helps to maintain their diversity. The biggest obstacle to spider protection is the lack of public support, which can be linked to ignorance and concern. These concerns could theoretically be addressed by pointing out that very few spider species pose a threat to humans and by educating...
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