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Selective hydrogenation/Oxidation of CVD graphene using AFM
Přikryl, Vojtěch ; Švarc, Vojtěch (referee) ; Bartošík, Miroslav (advisor)
Graphene is a perspective material for utilization in electronics due to its high charge carrier mobility. However, in order to be applicable in practice the bandgap opening is necessary. One way of achieving this is modification of graphene by hydrogenation or oxidation. This work concerns the possibility of using AFM for local hydrogenation/oxidation of graphene depending on the bias voltage between the tip and the sample. The presence of hydrogenation/oxidation was examined by Kelvin probe force microscopy and Raman spectroscopy. The possibility of oxidation was proved but hydrogenation was not proved.
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Development of probes for combined magnetic force microscopy and electron microscopy
Láznička, Tomáš ; Švarc, Vojtěch (referee) ; Pavera, Michal (advisor)
This thesis deals with the production of magnetic probes for Magnetic Force Microscopy. For production, it was necessary to construct a device that can be used to make magnetic probes from commercial AFM probes. The requirements for the holder for deposition are specified, mechanical designs of six proposals which have been improved are discussed and further is described a production of magnetic probes. In a special chapter are shown deposited material on probe tips surface and results of testing magnetic probes.
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Fabrication of nanostructures on graphene using AFM mechanical lithography and observation of their electronic response
Belko, Peter ; Švarc, Vojtěch (referee) ; Bartošík, Miroslav (advisor)
Graphene is a suitable material for future sensors and biosensors due to its high sensitivity to the presence of adsorbents, low thermal noise, and biocompatibility. This work focuses on the lateral shaping of graphene on SiO2 using atomic force microscope-based mechanical lithography. The created barriers exhibit resistances on the order of hundreds of G and are applicable for nanosensor fabrication. Charge propagation is studied in this work through concurrent measurements of Kelvin probe force microscopy and macroscopic transport measurements at various humidities, corresponding to real conditions of atmospheric or solution-based sensors and biosensors.
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A microfluidic platform for working with biological material
Vírostko, Ján ; Švarc, Vojtěch (referee) ; Hrdý, Radim (advisor)
Táto bakalárska práca sa zameriava na návrh a výrobu mikrofluidej platformy určenej pre lýzu buniek a ich následnú analýzu. Táto platforma by mala byť schopná efektívne mechanicky rezať bunky v preparátoch červených krviniek a následne ich analyzovať pomocou dvojelektródového elektrochemického systému. Teoretická časť tejto práce je zameraná na technológiu laboratória na čipe a používané komponenty v tejto technológií, ako napríklad mikrofluidné separátory, mixéry, komory určené na lýzu alebo mikroreaktory, ich aplikáciu a na koniec ich výrobu v čistých priestoroch. Taktiež je časť venovaná stručnej rozprave o fyzike prúdenia tekutín v mikroskopických kanáloch. Praktická časť tejto práce sa skladá z návrhu, výroby v čistých priestoroch a zapúzdrenia troch typov spomínanej platformy pomocou polymeru Parylene C. Následne je popísaná príprava zariadení na testovanie a ich následne testovanie. Na záver je uvedená dokumentácia výroby pomocou vytvárania snímkov s použitím elektrónového mikroskopu a grafické závislosti vypočítané počas charakterizácie elektród a snímky správania sa analytu v komore na lýzu.
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Development of probes for combined magnetic force microscopy and electron microscopy
Láznička, Tomáš ; Švarc, Vojtěch (referee) ; Pavera, Michal (advisor)
This thesis deals with the production of magnetic probes for Magnetic Force Microscopy. For production, it was necessary to construct a device that can be used to make magnetic probes from commercial AFM probes. The requirements for the holder for deposition are specified, mechanical designs of six proposals which have been improved are discussed and further is described a production of magnetic probes. In a special chapter are shown deposited material on probe tips surface and results of testing magnetic probes.
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Selective hydrogenation/Oxidation of CVD graphene using AFM
Přikryl, Vojtěch ; Švarc, Vojtěch (referee) ; Bartošík, Miroslav (advisor)
Graphene is a perspective material for utilization in electronics due to its high charge carrier mobility. However, in order to be applicable in practice the bandgap opening is necessary. One way of achieving this is modification of graphene by hydrogenation or oxidation. This work concerns the possibility of using AFM for local hydrogenation/oxidation of graphene depending on the bias voltage between the tip and the sample. The presence of hydrogenation/oxidation was examined by Kelvin probe force microscopy and Raman spectroscopy. The possibility of oxidation was proved but hydrogenation was not proved.
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