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Application of Graphene Membrane in Nanoelectronic Devices
Kormoš, Lukáš ; Drbohlavová, Jana (referee) ; Bartošík, Miroslav (advisor)
This diploma thesis is focused on the applications and fabrication of graphene membrane from graphene prepared by the chemical vapor deposition. Theoretical part deals with transport properties of the graphene and multiple scattering processes limiting the charge carrier mobility in this material. Included is short review of graphene membrane applications. Experimental part provides fabrication process for achieving suspended graphene device by utilizing electron beam lithography, focused ion beam, chemical etching and patterning of graphene. Graphene membrane is characterized by transport properties measurement and compared to non-suspended graphene.
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Transport properties of hyaluronan-based hydrogel systems
Káčeríková, Martina ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
This bachelor thesis deals with the study of trasport properties of hydrogels, that were prepared by interaction of hyaluronan with karbethopendecinium bromide (Septonex), as a surfactant. Nile red is a fluorescent probe to determine the ability of the system to absorb or to release the substance. All the hydrogels were prepared by the „wet“ way, where the solutions of hyaluronan and surfactant were prepared first. Nile red was prepared in the solution of tenzide, which after the mixing with hyaluronan produced colorful gels. By the spectrophotometric measurement, the absorbance of supernatants were observed. The absorbance was measured in original but also in changed supernatatns after 24, 72 and 168 hours.
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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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Transport properties of hyaluronan-based hydrogel systems
Káčeríková, Martina ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
This bachelor thesis deals with the study of trasport properties of hydrogels, that were prepared by interaction of hyaluronan with karbethopendecinium bromide (Septonex), as a surfactant. Nile red is a fluorescent probe to determine the ability of the system to absorb or to release the substance. All the hydrogels were prepared by the „wet“ way, where the solutions of hyaluronan and surfactant were prepared first. Nile red was prepared in the solution of tenzide, which after the mixing with hyaluronan produced colorful gels. By the spectrophotometric measurement, the absorbance of supernatants were observed. The absorbance was measured in original but also in changed supernatatns after 24, 72 and 168 hours.
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Application of Graphene Membrane in Nanoelectronic Devices
Kormoš, Lukáš ; Drbohlavová, Jana (referee) ; Bartošík, Miroslav (advisor)
This diploma thesis is focused on the applications and fabrication of graphene membrane from graphene prepared by the chemical vapor deposition. Theoretical part deals with transport properties of the graphene and multiple scattering processes limiting the charge carrier mobility in this material. Included is short review of graphene membrane applications. Experimental part provides fabrication process for achieving suspended graphene device by utilizing electron beam lithography, focused ion beam, chemical etching and patterning of graphene. Graphene membrane is characterized by transport properties measurement and compared to non-suspended graphene.
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