TY - BOOK
T1 - Synthesis and Applications of Chemically Derived Graphene
T2 - From Fundamentals to Applications
AU - Overgaard, Marc Hvid
PY - 2017
Y1 - 2017
N2 - This Ph.D. thesis investigates the chemical synthesis and applications of chemically derived graphene, with focus on reducing the structural defects in graphene oxides. The first part of the thesis covers the fundamental understanding of the synthesis and structure of graphene oxide, and the second part utilizes the knowledge gained from the first part to investigate new applications of the developed graphene oxide materials. Introduction of structural defects caused by overoxidation of graphene oxide obtained via the Hummers' modified method is a well known problem, and impedes the electronic properties of reduced graphene oxide. State-of-the-art synthesis protocols for various graphene oxide materials is demonstrated in this thesis. This was achieved by careful control and systematic optimization of the synthesis parameters including reaction temperature, amount of oxidizing agent, reaction time and reaction work-up procedure. Reduction also plays an important role and it is concluded that thermal annealing introduces additional defects, while chemical reduction with trifluoro acetic acid and hydro iodic acid greatly diminishes defect formation. A binder-free and water based ink formulation based on the state-of-the-art graphene oxide is demonstrated for screen-printing of semi-transparent graphene oxide thin film electrodes printed on transparent and flexible plastic substrates. The chemical reduction with trifluoro acetic acids and hydro iodic acid allows for efficient reduction and is compatible with these plastic substrates, in contrast to thermal annealing. The reduced thin films show good conductivity and tolerance to flexing. Another graphene oxide derivative ink is also demonstrated for screen-printing of non-transparent electrodes, and exhibit remarkable low sheet-resistance of 1-10 /sq after film compression, even with binders. The synthesis of this ink is not described in details due to IPR considerations. Graphene oxide is also investigated as an anti-static agent for fluoropolymer protective coatings. The graphene oxide solution is found to mix well with the FEP and the coatings exhibits anti-static behaviours. In addition another graphene fluoropolymer blend is also investigated and shows remarkable permeability resistance against water as well as rendering the coatings anti-static. A recent two component model of graphene oxide is also investigated and the results unequivocally suggests that graphene oxide is more suitably described by a one component model.
AB - This Ph.D. thesis investigates the chemical synthesis and applications of chemically derived graphene, with focus on reducing the structural defects in graphene oxides. The first part of the thesis covers the fundamental understanding of the synthesis and structure of graphene oxide, and the second part utilizes the knowledge gained from the first part to investigate new applications of the developed graphene oxide materials. Introduction of structural defects caused by overoxidation of graphene oxide obtained via the Hummers' modified method is a well known problem, and impedes the electronic properties of reduced graphene oxide. State-of-the-art synthesis protocols for various graphene oxide materials is demonstrated in this thesis. This was achieved by careful control and systematic optimization of the synthesis parameters including reaction temperature, amount of oxidizing agent, reaction time and reaction work-up procedure. Reduction also plays an important role and it is concluded that thermal annealing introduces additional defects, while chemical reduction with trifluoro acetic acid and hydro iodic acid greatly diminishes defect formation. A binder-free and water based ink formulation based on the state-of-the-art graphene oxide is demonstrated for screen-printing of semi-transparent graphene oxide thin film electrodes printed on transparent and flexible plastic substrates. The chemical reduction with trifluoro acetic acids and hydro iodic acid allows for efficient reduction and is compatible with these plastic substrates, in contrast to thermal annealing. The reduced thin films show good conductivity and tolerance to flexing. Another graphene oxide derivative ink is also demonstrated for screen-printing of non-transparent electrodes, and exhibit remarkable low sheet-resistance of 1-10 /sq after film compression, even with binders. The synthesis of this ink is not described in details due to IPR considerations. Graphene oxide is also investigated as an anti-static agent for fluoropolymer protective coatings. The graphene oxide solution is found to mix well with the FEP and the coatings exhibits anti-static behaviours. In addition another graphene fluoropolymer blend is also investigated and shows remarkable permeability resistance against water as well as rendering the coatings anti-static. A recent two component model of graphene oxide is also investigated and the results unequivocally suggests that graphene oxide is more suitably described by a one component model.
UR - https://rex.kb.dk/permalink/f/fic8lq/KGL01012063077
M3 - Ph.D. thesis
BT - Synthesis and Applications of Chemically Derived Graphene
PB - Department of Chemistry, Faculty of Science, University of Copenhagen
ER -