magistrsko delo
Tina Đukić (Author), Boštjan Genorio (Mentor), Marjan Marinšek (Thesis defence commission member), Aleš Ručigaj (Thesis defence commission member)

Abstract

Grafen, material z izjemnimi toplotnimi, električnimi, optičnimi in mehanskimi lastnostmi, postaja vse bolj zanimiv za uporabo v sodobnih električnih napravah. S prilagajanjem njegovih lastnosti določenemu namenu, tj. z njegovo funkcionalizacijo, je mogoče izdelati visoko zmogljive elektrodne sisteme. Posebej pomembna je uporaba grafena v Li-organskih baterijskih sistemih, katerih glavni problem je odtapljanje redoks aktivnih molekul v konvencionalnih organskih elektrolitih skozi čas. Grafen ima lahko v teh sistemih dvojno vlogo: 1) izredno porozna, netopna podlaga za vezavo redoks aktivnih molekul, in 2) nosilec naboja. S ciljem odkritja materiala, ki bi zadovoljil naštete kriterije, je bila preučevana možnost funkcionalizacije dveh grafenskih materialov različnih specifičnih površin, z različno vsebnostjo kisikovih skupin, in sicer reduciranega grafen oksida (rGO) ter njegovega prekurzorja, grafen oksida (GO), z izbranimi redoks aktivnimi molekulami (2-aminoantrakinon in antrakinon-2-diazonijev tetrafluorborat) s pomočjo ultrazvočne kavitacije. Z uporabo vrstične elektronske mikroskopije, Brunauer–Emmett–Teller metode, Ramanske spektroskopije, Fourierjeve transformacijske infrardeče spektroskopije in termogravimetrične analize, sklopljene z masno spektrometrijo, je bila izvedena podrobna analiza sintetiziranih materialov. Opažena je bila pomembna prednost pristopa z diazonijevo soljo, kjer je uporaba ultrazvočne kavitacije bistveno prispevala k funkcionalizaciji materialov. Analize so pokazale uspešnost izbranega načina funkcionalizacije, zlasti v primeru GO.

Keywords

grafen;grafenski materiali;funkcionalizacija grafena;redoks aktivne molekule;ultrazvočna kavitacija;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [T. Đukić]
UDC: 620.1(043.2)
COBISS: 34942467 Link will open in a new window
Views: 355
Downloads: 72
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Other data

Secondary language: English
Secondary title: Functionalization of reduced graphene oxide with redox active molecules via cavitation
Secondary abstract: Graphene, a material of exceptional thermal, electrical, optical and mechanical properties, is becoming increasingly interesting for applications in modern electrical devices. By adapting its properties to a certain purpose, i.e. by its functionalization, it is possible to make high-capacity electrode systems. Of particular importance is the application of graphene in Li-organic battery systems, whose main problem is the dissolution of redox active molecules in conventional electrolytes over time. Graphene can play a dual role in these systems: 1) extremely porous, insoluble substrate for binding redox active molecules, and 2) charge carrier. In order to find a material that would meet the above criteria, the possibility of functionalization of two graphene materials with different specific surfaces and with different content of oxygen groups, namely reduced graphene oxide (rGO) and its precursor, graphene oxide (GO), with selected redox active molecules (2-aminoanthraquinone and anthraquinone-2-diazonium tetrafluoroborate) by ultrasonic cavitation has been studied. Using scanning electron microscopy, Brunauer–Emmett–Teller method, Raman spectroscopy, Fourier-transform infrared spectroscopy, and thermogravimetric analysis with mass spectrometry, a detailed analysis of the synthesized materials was performed. A significant advantage of the diazonium salt approach was observed, where the application of ultrasonic cavitation significantly contributed to the functionalization of the materials. The analyses showed the success of the chosen method of functionalization, especially in the case of GO.
Secondary keywords: graphene;functionalization;redox active molecules;ultrasound cavitation;
Type (COBISS): Master's thesis/paper
Study programme: 1000376
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemijsko inženirstvo
Pages: 65 str.
ID: 12046366