Dissertations / Theses on the topic 'Graphite oxide'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Graphite oxide.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Sokolov, Denis A. "Investigation of Graphene Formation from Graphite Oxide and Silicon Carbide." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/53642.
Full textArbuzov, A. A., V. E. Muradyan, and B. P. Tarasov. "Synthesis of Few-layer Graphene Sheets via Chemical and Thermal Reduction of Graphite Oxide." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35063.
Full textNyangiwe, Nangamso Nathaniel. "Graphene based nano-coatings: synthesis and physical-chemical investigations." Thesis, UWC, 2012. http://hdl.handle.net/11394/3237.
Full textIt is well known that a lead pencil is made of graphite, a naturally form of carbon, this is important but not very exciting. The exciting part is that graphite contains stacked layers of graphene and each and every layer is one atom thick. Scientists believed that these graphene layers could not be isolated from graphite because they were thought to be thermodynamically unstable on their own and taking them out from the parent graphite crystal will lead them to collapse and not forming a layer. The question arose, how thin one could make graphite. Two scientists from University of Manchester answered this question by peeling layers from a graphite crystal by using sticky tape and then rubbing them onto a silicon dioxide surface. They managed to isolate just one atom thick layer from graphite for the first time using a method called micromechanical cleavage or scotch tape. In this thesis chemical method also known as Hummers method has been used to fabricate graphene oxide (GO) and reduced graphene oxide. GO was synthesized through the oxidation of graphite to graphene oxide in the presence of concentrated sulphuric acid, hydrochloric acid and potassium permanganate. A strong reducing agent known as hydrazine hydrate has also been used to reduce GO to rGO by removing oxygen functional groups, but unfortunately not all oxygen functional groups have been removed, that is why the final product is named rGO. GO and rGO solutions were then deposited on silicon substrates separately. Several characterization techniques in this work have been used to investigate the optical properties, the morphology, crystallography and vibrational properties of GO and rGO.
Lee, Dongwook. "The structure and magnetism of graphite oxide." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611649.
Full textLi, Wei. "Composite polymer/graphite/oxide electrode systems for supercapacitors." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439309266.
Full textArbuzov, A. A., V. E. Muradyan, B. P. Tarasov, and E. A. Sokolov. "Preparation of Amino-Functionalized Graphene Sheets and their Conductive Properties." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35639.
Full textJiang, San-Ping. "A study of teflon-bonded cobalt oxide/graphite electrodes." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306058.
Full textShulga, Y. M., S. A. Baskakov, E. I. Knerelman, G. I. Davidova, E. R. Badamshina, S. Y. Shulga, E. A. Skrileva, A. L. Agapov, D. N. Voylov, and A. P. Sokolov. "Carbon Nanomaterial Produced by Microwave Exfoliation of Graphite Oxide." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35118.
Full textMowry, Michael N. "In situ Raman Spectroscopy Study of the Formation of Graphene from Urea and Graphite Oxide." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17424.
Full textGraphene, 10 or fewer atomic layers of carbon atoms, has attracted much attention during recent years due to its unique structure and exceptional physical properties. While there exist a wide range of potential applications, as with many nanomaterials, new synthesis techniques are required that allow for a production of graphene on an industrial scale. In this study, in situ Raman spectroscopy was used to study the formation and doping of graphene during urea-assisted thermal exfoliation of graphite oxide (GO), a promising new synthesis method that can be scaled to industrial levels. Thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and mass spectroscopy were used complementary to Raman spectroscopy to assist with the interpretation of the obtained data. Raman spectroscopy is a powerful characterization tool for the analysis of carbon nanomaterials, such as graphene. While several researchers have reported on the reaction of urea and GO, none of the studies found in literature has provided deeper insights on the evolution of the graphene structure and the simultaneous incorporation of nitrogen into the honeycomb lattice during synthesis. The knowledge gained from this work allows for a better understanding of the graphene production process and provides further evidence for the potential nitrogen-doping of graphene via deposition of urea.
Leve, Zandile Dennis. "Determination of paracetamol at the electrochemically reduced graphene oxide-metal nanocomposite modified pencil graphite (ERGO-MC-PGE) electrode using adsorptive stripping differential pulse voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7350.
Full textThis project focuses on the development of simple, highly sensitive, accurate, and low cost electrochemical sensors based on the modification of pencil graphite electrodes by the electrochemical reduction of graphene oxide-metal salts as nanocomposites (ERGO-MC-PGE; MC = Sb or Au nanocomposite). The electrochemical sensors ERGO-Sb-PGE and ERGO-Au-PGE were used in the determination of paracetamol (PC) in pharmaceutical formulations using adsorptive stripping differential pulse voltammetry. The GO was prepared from graphite via a modified Hummers’ method and characterized by FTIR and Raman spectroscopy to confirm the presence of oxygen functional groups in the conjugated carbon-based structure whilst, changes in crystalline structure was observed after XRD analysis of graphite and GO.
2023-10-07
Dahlberg, Tobias. "The first order Raman spectrum of isotope labelled nitrogen-doped reduced graphene oxide." Thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-116699.
Full textPradhan, Siddharth. "Quantification of Graphene Oxide Structure Using an Improved Model." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342730902.
Full textKushch, S. D., N. S. Kuyunko, V. E. Muradyan, L. A. Korshunova, N. N. Dremova, and B. P. Tarasov. "Platinum Nanoparticles Supported on Reduced Graphite Oxide as Hydrogenation Catalyst." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35054.
Full textKushch, S. D., N. S. Kuyunko, A. A. Arbuzov, N. N. Dremova, and V. E. Muradyan. "Pt supported on reduced graphite oxide catalysts for H2 activation." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35570.
Full textKruger, Hermanus Joachim. "Characterisation of expandable graphite and its flame retardant abilities in flame retardant systems for polyethylene." Thesis, University of Pretoria, 2017. http://hdl.handle.net/2263/61304.
Full textThesis (PhD)--University of Pretoria, 2017.
Chemical Engineering
PhD
Unrestricted
Cerezo, Frances Therese, and francestherese_cerezo@hotmail com. "Thermal stability and mechanical property of polymer layered graphite oxide composites." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080627.161157.
Full textKiryukhin, D. P., Y. M. Shulga, S. A. Baskakov, G. A. Kichigina, P. P. Kushch, and A. Michtchenko. "Low Temperature Post Radiation Polymerization of Tetrafluoroethylene in the Presence of the Graphene 3D Material." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35597.
Full textTekenya, Ronald. "Graphene-modified pencil graphite mercury-film electrodes for the determination of trace metals by cathodic adsorptive stripping voltammetry." University of the Western Cape, 2018. http://hdl.handle.net/11394/6552.
Full textThis project focuses on the simple, fast and highly sensitive adsorptive stripping voltammetry detection of Nickel and Cobalt complexed with DMG and Nioxime respectively at a Reduced Graphene Oxide modified pencil graphite electrode in water samples. This research as well demonstrates a novel electrochemically reduced graphene oxide (ERGO)/mercury film (MF) nanocomposite modified PGE, prepared through successive electrochemical reduction of graphene oxide (GO) sheets and in-situ plated mercury film. The GO and graphene were characterized using FT-IR, HR-SEM, HR-TEM, XRD and Raman spectroscopy. The FT-IR results supported by Xray diffraction analysis confirmed the inclusion of oxygen moieties within the graphitic structure during the chemical oxidation step. Microscopic and spectroscopic analysis was used to confirm the stackings of graphene on the pencil electrode. The ERGO-PG-MFE, in combination with a complexing agents of [dimethylglyoxime (DMG) and Nioxime] and square-wave cathodic stripping voltammetry (SW-CSV), was evaluated towards the individual determination of Ni2+ and Co2+ respectively and simultaneous determination of both metals from the combination of DMG and Nioxime mixture. A single-step electrode pre-concentration approach was employed for the in-situ Hg-film electroplating, metal-chelate complex formation and its non-electrolytic adsorption at – 0.7 V for the individual analysis of Ni2+ and Co2+. The current response due to metal-ligand(s) complex reduction were studied as a function of experimental variables; deposition/accumulation potential, deposition/accumulation time, rotation speed, frequency and amplitude and carefully optimized for the individual determination of Ni2+and Co2+ and simultaneous determination of Ni2+ and Co2+ at low concentration levels (μg L-1) in 0.1 M NH3- NH4Cl buffer solution (pH 9.4) solution. The recorded limit of detection for the individual analysis of Ni2+and Co2+ was found to be 0.120 μg L-1 and 0.220 μg L-1 respectively, at an accumulation time of 120 s for both metals. The recorded limit of detection of the simultaneous analysis of Ni2+ and Co2+ was found to be 6.1 μg L-1 and 1.8 μg L-1 respectively. The ERGO-PG-MFE further demonstrated a highly selective stripping response toward all trace metal analysis. The testing of the applicability of graphene-based sensor and method in laboratory tap water samples was evaluated. This electrode was found to be sensitive enough to detect metal ions in the tap water samples at the 0.2 μg L-1 level for individual analysis and 0.001 μg L-1 for simultaneous, well below WHO standards.
Jankus, Daniel James. "Antimicrobial Properties of Graphite and Coal-Derived Graphene Oxides as an Advanced Coating for Titanium Implants." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103151.
Full textMaster of Science
Any time a patient receives implantation surgery, there is a chance of microbes entering the body. These are typically naturally occurring skin flora, harmless but opportunistic. On the surface of implants within the body, these bacteria can form colonies called biofilms, leading to severe and potentially deadly infections, called prosthetic joint infection (PJI). PJI often requires multiple surgeries to remedy, but rates of reinfection are relatively high. As with any surgery, patients are given antibiotic drugs, but implants to not receive blood flow as the body normally would, reducing the effectiveness of antibiotics. Once biofilms are formed, the bacteria become even hardier and resistant even to powerful antibiotics. Graphene oxide (GO) is a carbon material known to have good biocompatibility (i.e., non-toxic) while providing antimicrobial properties. The focus of this study is on the development and characterization of a robust coating for titanium alloy implants to promote bone healing while reducing microbial biofilm colonization on the implant's surface. The novelty of this study is the use of proprietary coal-derived graphene oxide (c-GO) in a biomedical application. c-GO has been demonstrated to have a different chemical makeup than graphite-derived GO, which may improve its efficacy as an antimicrobial coating. As an alternative to powerful antimicrobial drugs, it was hypothesized that a coating of graphene-oxide would provide a defensive, passively antimicrobial layer to a titanium implant. While GO is typically quite expensive, the newly developed one-pot process provides an economical and environmentally friendly method of producing GO from coal (c-GO). The result is a coating that is inexpensive and capable of halving the biofilm formation of MRSA on titanium-alloy surgical screws in addition to providing improved bone cell adhesion and hard tissue compatibility.
Ghaffari, Nastaran. "Electrochemical deposition of Graphene Oxide- metal nano-composite on Pencil-Graphite Electrode for the high sensitivity detection of Bisphenol A by Adsorptive Stripping Differential Pulse Voltammetry." University of the Western Cape, 2018. http://hdl.handle.net/11394/6336.
Full textElectrochemical platforms were developed based on pencil graphite electrodes (PGEs) modified electrochemically with reduced graphene oxide metal nanoparticles (ERGO–metalNPs) composite and used for the high-sensitivity determination of Bisphenol A (BPA) in water samples. Synergistic effects of both reduced Graphene Oxide sheets and metal nanoparticles on the performance of the pencil graphite electrode (PGE) were demonstrated in the oxidation of BPA by differential pulse voltammetry (DPV). A solution of graphene oxide (GO) 1 mg mL-1 and 15 ppm of metal stock solutions (1,000 mg L-1, atomic absorption standard solution) (Antimony or Gold) was prepared and after sonication deposited onto pencil graphite electrodes by cyclic voltammetry reduction. Different characterization techniques such as FT-IR, HR-SEM, XRD and Raman spectroscopy were used to characterize the GO and ERGO–metalNPs. Parameters that influence the electroanalytical response of the ERGO–SbNPs and ERGO–AuNPs such as, pH, deposition time, deposition potential, purging time were investigated and optimized. Well-defined, reproducible peaks with detection limits of 0.0125 μM and 0.062 μM were obtained for BPA using ERGO–SbNPs and ERGO–AuNPs respectively. The rGO-metalNPs–PGE was used for the quantification of BPA in tap water sample and proved to be suitable for the detection of BPA below USEPA prescribed drinking water standards of 0.087 μM.
Chu, Hua-Wei. "Development of solution-processed methods for graphene synthesis and device fabrication." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44738.
Full textThar, Dhaval. "Acetone Induced Structural Effects on Charge Storage in PEO-Graphite Supercapacitor Electrodes." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1490351036541031.
Full textShinde, Amul [Verfasser], and Nils [Akademischer Betreuer] Huse. "Ultrafast dynamics of graphite oxide and semiconductor saturable absorber / Amul Shinde ; Betreuer: Nils Huse." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1158900279/34.
Full textSanga, Nelia Abraham. "Determination of heavy metals at the electrochemically reduced graphene oxide mercury film electrode (ERGO-HgF-PGE) using adsorptive stripping voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7718.
Full textThis work reports the use of a pencil graphite electrode (PGE) as inexpensive and sensitive electrochemical sensing platform fabricated by using electrochemically reduced graphene oxide (ERGO) in conjunction with an in-situ plated thin mercury film. For the first time the ERGOHgF-PGE sensor is proposed for simultaneous detection of cadmium (Cd2+), copper (Cu2+), lead (Pb2+) and zinc (Zn2+) using N-Nitroso-N-phenylhydroxylamine (cupferron) as complexing agent by square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV). The technique is based on the adsorption of cupferron- metal ion complexes onto the surface of the ERGO-HgFPGE at 0.1 V for 60 s carried out in 0.1 M acetate buffer solution (pH 4.6). The synthesized graphene oxide (GO) and graphene nanosheets (GNs) were characterized using different analytical techniques such as FT-IR which confirms the presence of oxygen moieties embedded in the graphitic structure and further demonstrated by UV-Vis, validating the synthesis of GO
2023
Moloto, Ledwaba Harry. "Reduction of ferric and ferrous compounds in the presence of graphite using mechanical alloying." Thesis, Vaal University of Technology, 2011. http://hdl.handle.net/10352/419.
Full textMany oxidic iron compounds—iron oxides; oxy-hydroxides and hydroxides—not only play an important role in a variety of disciplines but also serve as a model system of reduction and catalytic reactions. There are more than 16 identifiable oxidic iron compounds. The reduction of these compounds has been investigated for centuries. Despite this, the reduction behavior of the oxides is not fully understood as yet. To date the reduction mechanism is still plagued with uncertainties and conflicting theories, partly due to the complex nature of these oxides and intermediates formed during the reduction. Thermodynamically, the reduction of iron oxide occurs in steps. For example, during the reduction of hematite (a-Fe2O3) magnetite (Fe3O4) is first formed followed by non-stoichiometric wüstite (Fe1-yO) and lastly metallic iron (a-Fe). The rate of transformation depends on the reduction conditions. Further, this reduction is accompanied by changes in the crystal structure. The reduction behavior of iron oxides using graphite under ball-milling conditions was investigated using Planetary mono mill (Fritsch Pulverisette 6), Mössbauer Spectroscopy (MS), X-ray Diffraction (XRD), Scanning electron microscopy (SEM) and Transmission Electron Microscopy (TEM). It was found that hematite transformed into magnetite, Wüstite and or cementite depending on the milling conditions. The study shows that by increasing the milling time, the rotational speed and / or the ball to powder ratio, the extent of the conversion of hematite to its reduction products increased. Further investigations are required for the elucidation of the reduction mechanism. The reaction og magnetite and graphite at different milling conditions lead to the formation of Fe2+ and Fe3+ species, the former increasing at the expense of Fe3O4. Fe3O4 completely disappeared after a BPR of 50:1 and beyond. The Fe2+ species was confirmed to be due to FeO using XRD analysis. HRSEM images Fe2O3 using scanning electron microscopy prior to and after milling at different times showed significant changes while the milling period was increased, HRSEM images showed that the once well defined hematite particles took ill-defined shapes and also became smaller in size, which was a results of the milling action that induced reaction between the two powders to form magnetite. EDX spectra at different milling times also confirmed formation of magnetite. EDX elemental analysis and quantification confirmed the elemental composition of starting material consisting mainly of iron. Similarly, HRSEM images of Fe3O4 using Scanning electron microscopy (SEM) prior to and after milling at different BPR showed significant changes when the milling period was increased. EDX spectra at different milling times also confirmed formation of partial FeO and EDX elemental analysis and quantification confirmed the elemental composition of starting material consisting mainly of iron than Fe2O3. TEM images of both Fe2O3 and Fe3O4 particles at different milling conditions displayed observable particle damages as a function of milling period.The once well - defined particles (Fe2O3 and Fe3O4 ) successively took ill – defined shapes, possibly accompanied by crystallite size reduction. MAS showed that the reactive milling of α- Fe2O3 and C resulted in reduction to Fe3O4 , FeO and or cementite depending on the milling conditions etc Time, milling speed and BPR variation which influenced the reduction. The study shows that by increasing the milling time, the rotational speed and / or the ball to powder ratio, the extent of the conversion of hematite to its reduction products increased. XRD study investigations even though were unable to detect spm species (Fe2+ and Fe3+ ) which has smaller crystallites below detection limits ,the variation in time showed an increment in the magnetite peaks accompanied by recession of hematite and graphite peaks as the milling time was increased which relates to the MAS observation.XRD also corroborated the data obtained from MAS that showed that the main constituent was magnetite and further evidence in support of the reduction of hematite to magnetite under reactive milling was obtained using XRD . Overall, the work demonstrated selective reduction of Fe2O3 to Fe3O4 and Fe3O4 to FeO by fine tuning the milling conditions. It is envisaged that the reduction of FeO to Fe and possible carburization to FexC could also be achieved.
Kang, Seungyeon. "Femtosecond laser direct writing of 3D metallic structures and 2D graphite." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11495.
Full textEngineering and Applied Sciences
Macedo, Nadia Guerra. "Estudo e desenvolvimento de grafite como agente anti-chama para PVC." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-12092012-173435/.
Full textPVC is one of the most important thermoplastic polymers because of its versatility. However, like other polymers, for many technological uses, there is a need to enhance its thermal stability. Security is a global concern, so, the use of some fire retardants is required in polymer composites. Expanded graphite appears as a cleaner type of fire retardants, not well known yet. In the present work, expanded graphite obtained from the graphite oxide was studied. It were prepared PVC composite-membranes with 20 weight % of expanded graphite employing Doctor Blade. The samples were characterized by scanning electron microscope, thermogravimetric analysis and N2 adsorption/desorption isotherms were also collected for the determination of specific surface area and porous distribuition. The results show that the best fire retardant behaviour was achieved by the expanded graphite at 900oC, the graphite with the higher specific surface area and with the largest capacity of soot production.
Negreti, Maria Anita de Paula. "Obtenção e caracterização de compósitos poliméricos com óxido de grafeno reduzido." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13032017-115009/.
Full textThe graphene, one of the carbon allotropes, has received a great valorization in the scientific and industrial areas due its exceptional properties. Its electrical conductivity corresponds to copper ones and its thermal conductivity, hardness and strength are superior to known existent material properties. For this reason, it is necessary to search for a more efficient and productive method of obtaining. One of the most used methods nowadays is the Hummers method, it is based on graphite oxidation via acid treatment and also on chemical and thermal reduction. However, the yield of the process generally does not generate sufficient amount of material for preparing polymer composites using traditional mixing equipment such as extruders. Polymeric composites graphene have increased thermal and dimensional stability of molded parts compared to the same part without load, can be used as a flame retardant and also to ensure higher electrical conductivity to the polymer, can be used in touch screens and flexible solar cells. Faced to these possibilities, it is necessary to search for improvements to Hummers method, making it more effective and productive. Evaluating the chemical kinetic from the reaction of graphite oxide (GO), the removal manners from the residual acids from the process, the reduction technician from the oxygenated functional groups and the obtention method of the dry material to posterior incorporation in to the polymer, were evaluated in this work. Three oxidation methods have been performed and compared to GO commercial, and three reduction methods (chemical with NaBH4 and thermal to 550 °C and 1000 °C) have been tested. The GOs and the graphene oxide reduced (GORs) were characterized by Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopic (SEM) and Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The results showed that the reaction kinetic from the GO is not linear, because it has been obtained oxides with different characteristics, using the same reagents proportion in two methods (A and C). The filtration or the dialysis, used to remove the acids residues from the treatment, and the drying oven or the freeze drying, used to obtain the dry material, didn\'t interfere in the final properties of the GOs and GORs. Finally, the chemical reduction and the thermal shock at 700 ° C proved the most suitable methods for chemically modified graphene with good properties and increased yield. The composites obtained through an internal mixer were characterized with mechanical tests (tensile and impact), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Results indicated poor dispersion of the fillers in the polymer, which can be confirmed by the presence of agglomerates in the morphological analysis and the inferior mechanical properties of the composites.
Valim, Fernanda Cabrera Flores. "Comportamento reológico de compósitos reforçados com óxido de grafite em matriz de poli(metacrilato de metila)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-12072016-114838/.
Full textIn this study, composites of graphite oxide (GO) in poly(methyl methacrylate) (PMMA) were obtained. Obtaining of graphite oxide was performed by two potential methods by literature: modified Hummers method and Staudenmaier method; Then, a secondary GOs obtained heat treatment step - at 1000° C - was added in order to expand the graphite flakes and remove functional groups attached during the acid attack of graphite. The reinforcement obtained by both methods were characterized by X-Ray Diffraction (XRD), Raman Spectroscopy, Infra Red Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM), confirming the formation of Graphite Oxide by both methods, and also the expansion of the leaves after the heat treatment. Then, a comparative study of the polymer matrix composites with 1, 3 and 5 % concentration of oxides graphite before the heat treatment and 1 and 3 % after the heat treatment was performed in order to understand the contribution to the rheological properties of the polymer with the addition of GO reinforcement. The composites were obtained by internal mixer, varying the load adding method in the polymeric matrix - via mill and via solvent - to study the best dispersion of GO in the matrix. The samples were characterized by Gel Permeation Ghromatography (GPC), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM); and rheological measurements of Deformation Scan, Time Sweep, and Small Amplitude Oscillatory Shear (SAOS). The rheological results showed an increase in complex viscosity at both Time Sweep, as in SAOS. However, it was not possible to verify the increase of complex viscosity at low frequencies, that would indicate that graphite oxide form a three-dimensional arrangement, which prevents the percolation of the polymer chains, letting them to relax completely.
Hack, Renata. "Nanocompósitos poliméricos multifuncionais reforçados com grafeno." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/1655.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
O grafite natural é uma fonte de baixo custo e é abundante para obtenção de grafeno. O método que se mostrou mais eficiente para a produção de grafeno em larga escala é o método Hummers modificado, que consiste na oxidação do grafite. Com isso, o objetivo principal deste trabalho foi produzir grafeno a partir do grafite natural pelo método de Hummers modificado, além de produzir nanocompósitos de matriz epoxídica reforçada com o grafeno produzido (GP) e o grafeno comercial (GC). Para a produção dos nanocompósitos foi utilizado à resina epoxídica à base de éter diglicidílico do bisfenol A (DGEBA). Foram obtidos nanocompósitos em concentrações de 0,75; 1,00 e 2,00% m/m de GC e GP, com e sem a utilização de solvente THF no processo de preparação. Os resultados obtidos indicaram um alto grau de oxidação do grafite, comprovando assim que o processo foi eficiente. As análises de Raman e FTIR realizadas no GC e GP mostraram que o GP possui as mesmas características do GC. A adição do GC e GP com e sem adição de THF elevou a estabilidade térmica dos nanocompósitos. A alta concentração de nanoreforços e a não utilização de solvente THF em alguns sistemas pode ter contribuído para a formação de aglomerados nestes nanocompósitos, decorrendo assim em uma diminuição do módulo de Young. Através da análise de impedância foi possível verificar que apenas os nanocompósitos com 2%m/m de GP sem THF apresentou percolação dielétrica. Verifica-se que a produção do grafeno a partir do grafite natural possui potencial para aplicação em nanocompósitos estruturais.
Kharlamov, A. I., M. E. Bondarenko, G. A. Kharlamova, and V. V. Fomemko. "Direct Synthesis of O-doped Carbon Nitride and Oxide of Graphite-like Carbon Nitride from Melamine." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42601.
Full textSilva, Delne Domingos da. "Produção de grafeno a partir do óxido de grafite e sua aplicação em nanocompósitos de matriz epoxídica." Universidade do Estado de Santa Catarina, 2011. http://tede.udesc.br/handle/handle/1598.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Graphite is the cheapest and the most abundant source to obtain graphene. For a large scale production of graphene and its application in nanocomposites, reduction of graphite oxide (GO) method has been currently used. The graphite oxidation causes an introduction of functional groups which leads to an increase in graphite interlayer distance, producing GO. The GO can be reduced either by chemical or thermal methods. Several polymer matrices have been utilized to produce graphene nanocomposites, one of them is the epoxy resin. One of the challenges to produce polymer nanocomposites is the total dispersion of the nanofillers into the matrix and a strong matrix/nanofillers interfacial adhesion to obtain enhanced final properties. The aim of this work was the production of reinforcements for application in epoxy matrix nanocomposites. From natural graphite, some reinforcements were produced, such as sonicated graphite (SG), exfoliated graphite by supercritical fluid of carbon dioxide (GE-scCO2), GO, expanded GO (EGO) and chemical reduced GO (RGO). Among these, only the SG, GO and EGO were utilized in nanocomposites production at concentrations of 0.025, 0.05, 0.075 e 0.1 wt% in epoxy resin based on diglycidyl ether of bisphenol-A (DGBEA). The results showed the graphite oxidation method was efficient to produce GO and both, chemical and thermal reduction methods, increases the thermal stability of the material, indicating high reduction level which was also verified by X-ray diffraction. The graphite exfoliation by scCO2 demonstrated to be a promising method for graphene production, although it had a low production rate. The results did not show significant changes in thermal stability and electrical conductivity of the nanocomposites, indicating an absence of a threshold percolation with the amounts of reinforcements studied. The most promising system to enhance mechanical properties of epoxy resin nanocomposites is that one with EGO, since it showed a tenacity increase and an improvement of ~70% in tensile strength, although the Young s modulus decreased. The results showed the reinforcements produced from the natural graphite have a great potential to be applied in structural nanocomposites, however to get more significant results on the properties evaluated, higher amounts of reinforcements and different dispersion methods should be studied further.
O grafite é a fonte mais abundante e de baixo custo para obtenção de grafeno. Para uma produção em larga escala de grafeno e sua aplicação em nanocompósitos, o método de redução do óxido de grafite (OG) tem sido o mais utilizado. Com a oxidação do grafite, grupos funcionais, são introduzidos na sua estrutura e causam o afastamento dos planos cristalinos do grafite, produzindo o OG. Sua redução pode ser realizada tanto por métodos químicos quanto térmicos. Várias matrizes poliméricas estão sendo utilizadas na produção de nanocompósitos com grafeno, dentre elas a resina epoxídica. Um dos desafios é proporcionar a dispersão total do nanoreforço na matriz e promover uma forte adesão interfacial matriz/nanoreforço para se obter melhores propriedades finais. Sendo assim, o objetivo desse trabalho foi produzir reforços a partir do grafite natural para aplicação em nanocompósitos poliméricos de matriz epoxídica. A partir do grafite natural, foram produzidos alguns reforços, como o grafite sonificado (GS), grafite esfoliado por fluido supercrítico de CO2 (GE-scCO2), OG, OG expandido (OGE) e OG reduzido quimicamente (OGR). Dentre estes, apenas o GS, OG e OGE foram utilizados na produção dos nanocompósitos, utilizando as concentrações de 0,025, 0,05, 0,075 e 0,1% m/m do reforço em matriz de resina epoxídica à base de éter diglicidílico do bisfenol A (DGEBA). Os resultados indicaram que o método de oxidação do grafite foi eficaz na produção de OG e que tanto a redução química quanto a térmica aumentou a estabilidade térmica do material, evidenciando alto grau de redução, comprovado também por difratografia de raios-X. A esfoliação do grafite por scCO2 se mostrou um método promissor na obtenção de grafeno, embora os resultados obtidos indicaram baixo rendimento de produção. Não foram observadas alterações significativas na estabilidade térmica e na condutividade térmica dos nanocompósitos, indicando que não se formaram redes de percolação nas concentrações estudadas. Os sistemas contendo OGE mostraram ser os mais promissores na melhoria das propriedades mecânicas, pois apresentou maior tenacidade e um incremento de até ~70% na resistência à tração, embora o módulo de Young tenha sido reduzido. Com base nestes dados, pode-se dizer que os reforços produzidos a partir do grafite natural possuem grande potencial para aplicação em nanocompósitos estruturais, porém para se obter resultados mais significativos a respeito das propriedades avaliadas, maiores concentrações de reforço e diferentes técnicas de dispersão devem ser estudadas.
Guimont, Aline. "Greffage de polydimethylsiloxane et de polyéthylène sur des feuillets de graphène oxydé : application à la synthèse de (nano)composites conducteurs." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10028/document.
Full textThe aim of this thesis was to experiment and validate new means of graphene exfoliation in an elastomer matrix such as silicone (PDMS) and a thermoplastic matrix such as polyethylene (PE). Because of the low affinity of graphene oxide for these matrices due to its high polarity, its chemical modification was carried out. Different approaches were explored: the grafting of PDMS onto GO was carried out with success by a direct functionalization with a PDMS terminated triethoxysilane and by a catalytic hydrosilation reaction of a PDMS terminated Si-H onto vinyltrimethoxysilane modified GO. The viscoelastic behavior of GO and modified GO/PDMS suspensions showed the importance of the filler-filler interaction on the formation of a percolating network. The rheological percolation threshold of the GO/PDMS suspension was obtained at ~1.75 wt% with an aspect ratio (Af) of ~60. In addition, the grafting of PE onto GO was studied with the high temperature radical grafting of pentadecane formed by a hydrogen atom abstraction with a peroxide, which was then extrapolated to a low molecular PE (Mn~2000). Moreover, thio and azide functionnalized PE with a similar Mn were also grafted onto graphite derivatives by a radical and a Michael addition. After choosing the filler which presented the closest electrical conductivity to the one of graphite powder and a good affinity for a heptane media, a LDPE based nano-composite that presented suitable electrical properties for an electromagnetic shielding application (4 105 Ω.cm at 25 wt%) was obtained and this without any use of toxic reducing agents
Dhahri, Abdelwaheb. "Synthèse et caractérisation de nanocomposites conducteurs à base de « graphène » et de polysaccharides." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1069/document.
Full textThe main objective of this thesis has been to experiment a new ways of exfoliation of graphene sheets in polysaccharide matrices such as cellulose and chitosan doped with gold nanoparticles (Au). Our strategy was to explore new routes for the grafting of molecules and macromolecules onto graphene oxide (GO). First, we have oxidized commercial graphite by the method of Hummers which is a priori the simplest method to implement to produce a stable suspension of graphene oxide sheets totally exfoliated in water. The advantage of this oxidation is the formation of carboxylic acid and epoxy functional groups onto the graphite surface that can be functionalized in two stages by ethylenediamine and then by a polysaccharide such as cellulose. Indeed, in order to improve the compatibility of graphite oxide with organic matrix such as cellulose, the idea is to graft it onto polysaccharide chains. These results made it possible to demonstrate the partial exfoliation of the graphene sheets after functionalization and to obtain a percentage of grafting of about 35wt% for cellulose. The electrical conductivity of the corresponding nanocomposites has also been studied by dielectric measurements at various temperatures. The increase of the electrical conductivity after the functionalization of graphite oxide showed a solvo-thermo reduction simultaneously with the functionalization. Finally, the doping of this material by gold particles made it possible to obtain an electrical conductivity of 1.60 10-4 S m-1. Concerning chitosan-based composite materials, the scientific approach was the same as cellulose substrate and we obtained a percentage of grafting of 68wt%. In addition, its catalytic activity for the conversion of 4-Nitrophenol to 4-Aminophenol was of high efficiency
Zhang, Yubai. "Electrochemical synthesis of 2D materials and their applications in energy storage." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410071.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Science
Science, Environment, Engineering and Technology
Full Text
Dhahri, Abdelwaheb. "Synthèse et caractérisation de nanocomposites conducteurs à base de « graphène » et de polysaccharides." Electronic Thesis or Diss., Lyon, 2017. http://www.theses.fr/2017LYSE1069.
Full textThe main objective of this thesis has been to experiment a new ways of exfoliation of graphene sheets in polysaccharide matrices such as cellulose and chitosan doped with gold nanoparticles (Au). Our strategy was to explore new routes for the grafting of molecules and macromolecules onto graphene oxide (GO). First, we have oxidized commercial graphite by the method of Hummers which is a priori the simplest method to implement to produce a stable suspension of graphene oxide sheets totally exfoliated in water. The advantage of this oxidation is the formation of carboxylic acid and epoxy functional groups onto the graphite surface that can be functionalized in two stages by ethylenediamine and then by a polysaccharide such as cellulose. Indeed, in order to improve the compatibility of graphite oxide with organic matrix such as cellulose, the idea is to graft it onto polysaccharide chains. These results made it possible to demonstrate the partial exfoliation of the graphene sheets after functionalization and to obtain a percentage of grafting of about 35wt% for cellulose. The electrical conductivity of the corresponding nanocomposites has also been studied by dielectric measurements at various temperatures. The increase of the electrical conductivity after the functionalization of graphite oxide showed a solvo-thermo reduction simultaneously with the functionalization. Finally, the doping of this material by gold particles made it possible to obtain an electrical conductivity of 1.60 10-4 S m-1. Concerning chitosan-based composite materials, the scientific approach was the same as cellulose substrate and we obtained a percentage of grafting of 68wt%. In addition, its catalytic activity for the conversion of 4-Nitrophenol to 4-Aminophenol was of high efficiency
Avril, Florian. "Contribution à l'élaboration d'un supercondensateur à basse de graphène." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS034/document.
Full textThe use of micro-power generation energy is a promising concept that consists in harvesting low and diffuse energy sources present in our environment for the supply of autonomous systems. The growing number of new miniaturized and communicating devices in civil and military fields should accentuate the phenomenon of energy dependence and open up new markets.Among possible sources of renewable energy, solar energy is the most promising source because it is potentially the most powerful and best distributed. The development of these micro-energy recovery systems involves low costs with flexible substrate (paper, polymer) and easily exploitable materials. After energy recovery, it is necessary for the autonomous systems to store electricity.For this purpose, supercapacitors are ideal candidates. Indeed, the main advantage of supercapacitors over batteries is their high power density (fast energy collection) as well as a long cycle life. The thesis concerns the manufacture of a supercapacitor and ultimately coupling with a solar cell. The work specifically concerns the study of graphene oxide (GO) synthesized by the Hummers and Marcano methods, its reduction in reduced graphene oxide (RGO) by chemical and electrochemical routes and the realization of supercapacitor. In this project, the properties of reduced graphene oxide (RGO) will be optimized during the reduction step and the material will be shaped into a sandwich structure (RGO / electrolyte / RGO) or interdigitated.Keywords: Graphene,supercapacitor, graphene oxide,energy micro-source
Hass, Joanna R. "Structural characterization of epitaxial graphene on silicon carbide." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26654.
Full textCommittee Co-Chair: Conrad, Edward; Committee Co-Chair: First, Phillip; Committee Member: Carter, Brent; Committee Member: de Heer, Walter; Committee Member: Zangwill, Andrew. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Pazat, Alice. "Chemical Modification of Graphite-based Derivates and Their Uses in Elastomer Nanocomposites." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1050/document.
Full textThe aim of this study was the investigation of various dispersion methods for graphite-based fillers in elastomers such as polyisoprene, to enhance mechanical and barrier properties. To increase graphite-rubber interactions and so decrease filler-filler aggregation, graphite-based fillers have been chemically modified. Graphite was previously oxidized into graphite oxide (GO), bearing epoxide, hydroxyl and carboxylic acid groups, which could further act as anchor sites for molecules and polymer chains. To increase the compatibility between GO and the polymeric matrix, amines and alkoxysilanes, as well as polymer chains, were grafted on GO. Grafting contents between 4-50 wt% were obtained, depending on the functionalization technique which was used. A thermal modification path of GO was also investigated and led to the formation of porous graphite structure. Polyisoprene composites containing 15 phr of these graphite-based fillers were prepared and showed decreased air permeability (-70 % for composites containing thermally-treated graphite filler, as compared to those containing carbon black only) as well as enhanced tensile properties. Finally, the use of ionic liquids as dispersing agents was investigated. Natural rubber – graphite composites with 1 wt% of ionic liquid displayed enhanced reinforcement (+ 25 % for the stress at 300 % strain) while maintaining similar strain at break to composites containing carbon black only
Wu, Zhibin, Xingzhong Yuan, Hua Zhong, Hou Wang, Guangming Zeng, Xiaohong Chen, Hui Wang, Lei zhang, and Jianguang Shao. "Enhanced adsorptive removal of p-nitrophenol from water by aluminum metal–organic framework/reduced graphene oxide composite." NATURE PUBLISHING GROUP, 2016. http://hdl.handle.net/10150/614746.
Full textMADDALENA, LORENZA. "Nanocoatings based on graphene related materials for gas barrier and heat shielding application." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2827707.
Full textAlshammari, Hanaa Ali. "Heating Power of Coated FeCoV Magnetic Nanoparticles." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464477896.
Full textFehse, Marcus. "Nanostructured titanium oxide as active insertion material for negative electrodes in Li-ion batteries." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-01018975.
Full textPakulski, Dawid. "Graphene based materials and their potential applications." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF060.
Full textScientific purpose of this doctoral dissertation is synthesis of functionalized two-dimensional materials (graphene and graphene oxide) and their comprehensive physicochemical characterization, with particular emphasis on adsorption and energy storage properties. We could demonstrate that covalent modification of graphene oxide (GO) with an organic polymer (BPEI) very favorably affects the efficiency of the adsorption process. The maximum adsorption capacity (qmax) values for heavy metal ions significantly favour this material in comparison to the majority of known carbon adsorbents. Moreover, functionalization of GO with mesoporous aminosilica (SiO2NH2) leads to obtaining an efficient and rapid adsorbent of organic cationic dyes (MB, RhB, MV). ln addition we proved that the functionalization of graphene (EEG) using the POM-surfactant su bu nits proved that this type of organic-inorganic hybrids material is very stable and have interesting electrical properties with potential application in the production of supercapacitors
Stankevičienė, Inga. "Synthesis and coatings production of carbonaceous nanostructures." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121017_111706-30788.
Full textUnikaliomis savybėmis pasižyminčios anglinės nanostruktūros panaudojamos dangų ir plėvelių gamyboje, kurios pritaikomos nanoelektronikoje, biotechnologijoje ir kitose srityse. Šio darbo tikslas buvo susintetinti daugiasienius anglinius nanovamzdelius ir grafito oksidą, pagaminti ir ištirti jų dangas. Mūsų laboratorijoje daugiasieniai angliniai nanovamzdeliai buvo susintetinti cheminio nusodinimo iš garų fazės metodu. Susintetinto produkto valymui nuo katalizatoriaus priemaišų pirmą kartą buvo panaudoti CCl4 garai. Ištyrus CCl4 garais paveiktą medžiagą buvo pagrįstas šio valymo metodo efektyvumas. Grafito oksidas buvo gautas oksiduojant grafitą Hummers'o metodu. Anglinių nanovamzdelių dangos ant skirtingų pagrindų buvo pagamintos cheminio nusodinimo iš garų fazės metodu bei suformuotos panaudojant medžiagos vandenines suspensijas. Grafito oksido su Kongo raudonojo dažo priedu dangos ir plėvelės buvo pagamintos laboratorijoje sukurtu filtravimo į tirpalą metodu. Anglinių nanovamzdelių ir jų dangų tyrimo rezultatai parodė, kad dangų morfologija priklauso nuo sintezės sąlygų, o paviršiaus savybes nulemia prisijungusių funkcinių grupių pobūdis ir kiekis. Ištyrus grafito oksido plėveles ir dangas buvo nustatyta, kad Kongo raudonojo dažo priedas skatina kompaktiškesnių nanokompozitų susidarymą ir stiprina dangų bei plėvelių patvarumą.
Stankevičienė, Inga. "Anglinių nanostruktūrų sintezė ir dangų gamyba." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121017_111714-25597.
Full textFilms and coatings of carbonaceous nanostructures are employed in nanoelectronics, biotechnology and other fields. The aim of the research was to synthesize multi-walled carbon nanotubes and graphite oxide and fabricate coatings thereof. Consequently, multi-walled carbon nanotubes and their coatings were synthesized by the catalytic chemical vapour deposition method. As-grown carbon nanotubes inevitably contain remains of metal catalyst particles. A method developed in the laboratory using CCl4 was successfully applied to remove the residual catalyst from the batch of synthesized carbon nanotubes. Simultaneously, graphite oxide was synthesized from graphite powder by Hummer's method. Coatings and films of carbonaceous nanostructures were fabricated from carbon nanotubes and graphite oxide aqueous suspensions. The analysis of carbon nanotubes coatings revealed that their morphology depends on synthesis parameters. The surface properties of these coatings depend on the amount and nature of functional groups attached to carbon nanotube walls. The analysis of graphite oxide films indicated that Congo red dye addition leads to more compact structure of the nanocomposites due the interaction between functional groups of these particles.
Alami, Omar. "Oxyde de graphène fonctionnalisés par des dendrons et dendrimères pour des applications en oncologie." Thesis, Toulouse 3, 2022. http://www.theses.fr/2022TOU30086.
Full textGraphene, a monolayer of carbon atoms densely packed in a honeycomb lattice, was first isolated in 2004. In recent years, research on graphene and its derivatives has generated considerable interest in a wide range of research activities thanks to its interesting properties. The easiest and most versatile way to obtain graphene-based nanocomposites is to oxidize natural graphite to obtain graphene oxide (GO), a material with a surface rich in modifiable chemical functions. Graphene oxide nanocomposites have been synthesized for potential applications in electronics, energy storage, catalysis and sorption, gas storage, separation and detection as well as in the biomedical field. Dendrimers are particularly advantageous macromolecules for a very large number of applications in extremely varied fields. This interest resides essentially in their properties of cooperativity and multivalence, as well as in their very high capacity for encapsulation or fixing of small molecules, and this in a volume of nanometric size. This structural characteristic is the consequence of their unique branched architecture containing a central core and having many peripheral functions. Dendrimers are very interesting tools for the delivery of drugs and nucleic acids. In this work we will develop simple approaches to decorate the surface of graphene oxide with phosphorus dondron and dendrimers in order to create new hybrid materials with new properties. First, the synthesis of classical phosphorus dendrimers and of AB5 dendrons will be carried out, followed by the grafting of the different monomers on their surface. In parallel the preparation of graphene oxide (GO) as well as the modification of the GO surface with different methods will be carried out, and finally the grafting of the different dendrons on the platform of graphene oxide will afford new hybrid materials that will be biologically tested
Nasr, Maryline. "Elaboration of oxides membranes by electrospinning for photocatalytic applications." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT210/document.
Full textNowadays, industrial toxic chemicals are still not properly treated and these contaminants may directly impact the safety of drinking water. Photocatalysis “a green technology” is an effective and economical approach and plays an important role in solar energy conversion and degradation of organic pollutants. This thesis manuscript reports on developing advanced materials (based on TiO2 and ZnO) being capable of exploiting renewable solar energy for solving the environmental pollution problems. A part of this work was dedicated to improve the UV and visible light TiO2 photoresponse. Therefore, rGO/TiO2, BN/TiO2 and BN-Ag/TiO2 composties nanofibers were successfully elaborated using the electrospinning technique. The second part focused on ZnO. Novel structures of ZnO/ZnAl2O4 multi co-centric nanotubes and Al2O3 doped ZnO nanotubes were designed by combining the two techniques of atomic layer deposition (ALD) and electrospinning. The morphological, structural and optical properties of all synthesized nanostructures were investigated by several characterization techniques. The results show that the chemical and physical properties have a high impact on the photocatalytic properties of the synthesized materials. Moreover, it was found that the doping effect lead to a more efficient charge separation in the photocatalyst, which is an advantage for photocatalytic activities. In addition, methyl orange and methylene blue were used as model reference. A significant enhancement and a long-term stability in the photocatalytic activity were observed with the doped materials compared to the non-doped ones under both UV and visible light. Antibacterial tests against Escherichia coli have also been performed; the results indicate that BN-Ag/TiO2 present interesting photocatalytic properties for both organic compound degradation and bacterial removal
Mach, Radoslav. "Vlastnosti grafenoidových vrstev." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377055.
Full textMuchharla, Baleeswaraiah. "Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/dissertations/1132.
Full text