A novel approach to electroconductive ceramics filled by graphene covered nanofibers

Drozdova, Maria; Hussainova, Irina; Pérez-Coll, Domingo; Aghayan, Marina; Ivanov, Roman; Rodríguez, Miguel Á.

doi:10.1016/j.matdes.2015.10.148

Cited by 33 publications

(15 citation statements)

References 25 publications

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“…It was demonstrated that the resulting material had an outstanding electrochemical stability and could serve as an excellent electrocatalyst support for Pt particles in fuel cells. A novel type of electroconductive ceramics was proposed by homogeneous dispersion of graphenated alumina nanofibers within alumina matrix. The developed approach utilized the advantages of reinforcement by fibers and high conductivity of graphene.…”

Section: Introductionmentioning

confidence: 99%

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

et al. 2017

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The authors propose a novel type of ion-selective membranes, which combine the advantages of ceramic nanofibrous media with good electrical conductivity. The membranes are produced from Nafen alumina nanofibers (diameter around 10 nm) by filtration of nanofiber suspension through a porous support followed by drying and sintering. Electrical conductivity is achieved by depositing a thin carbon layer on the nanofibers by chemical vapor deposition (CVD). Raman and FTIR spectroscopy, X-ray fluorescence analysis, and TEM are used to confirm the carbon structure formation. The deposition of carbon leads to decreasing porosity (from 75 to 62%) and specific surface area (from 146 to 107 m 2 g À1 ) of membranes, while the pore size distribution maximum shifts from 28 to 16 nm. Measurements of membrane potential in an electrochemical cell show that the carbon coated membranes acquire high ionic selectivity (transference numbers 0.94 for anion and 0.06 for cation in aqueous KCl). Fitting the membrane potential data by the Teorell-Meyer-Sievers model shows that the fixed membrane charge increases proportionally with increasing electrolyte concentration. The carbon coated membranes are ideally polarizable for applied voltages from À0.5 to þ0.8 V. The potential applications of produced membranes include nano-and ultrafiltration, separation of charged species, and switchable ion-transport selectivity.

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Section: Introductionmentioning

confidence: 99%

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

et al. 2017

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“…Raman spectroscopy and measurement of electrical resistance confirm this conclusion. These findings could be employed for further development of conductive nanoporous membranes for switchable ion transport [36,37,40] as well electroconductive ceramics [33,34].…”

Section: Resultsmentioning

confidence: 92%

“…Due to its unique aspect ratio and thermal stability up to 1250 °C [32], the Nafen material could be a promising support for few-layered graphene synthesis on its surface. This idea was realized 3 previously in [33,34]. The resulting composite material showed excellent properties as an electrocatalyst support for Pt particles in fuel cells, and as a novel type of filler for electroconductive ceramics.…”

Section: Introductionmentioning

confidence: 88%

Coupled thermal analysis of carbon layers deposited on alumina nanofibres

et al. 2019

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Catalyst-free chemical vapor deposition is used to form thin (1-2 nm) carbon layers on the surface of alumina nanofibers resulting in carbon-alumina nanocomposites. Thermal analysis, Xray fluorescent microanalysis, Raman spectroscopy, and electrical resistance measurements of these composites show that increasing of synthesis time not only increases the amount of carbon on alumina surface, but also the ordering and density of the carbon layers. Nitrogen adsorption data reveal the decrease of total pore volume with increasing the synthesis time. The obtained composite material could be employed for the preparation of ion-selective membranes with switchable ion transport, electroconductive ceramics, and electrochemical sensors.

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“…The fact that alumina has poor sinterability, from the one hand, and the addition of a reinforcement to produce a composite lowers the densification, from the other hand, indicates that obtaining fully dense alumina hybrid nanocomposites is challenging. Conventional consolidation techniques, such as furnace sintering [36] and hot pressing sintering [35,38,50,51,52], and non-traditional sintering techniques, such as SPS [32,39,40,41,43,53,54,55,56,57,58,59,60] and high-frequency induction heat sintering (HFIHS) [48], were used to sinter alumina hybrid nanocomposites.…”

Section: Consolidation Of Alumina Hybrid Nanocomposite Powdersmentioning

confidence: 99%

“…In fact, the use of SPS allowed for the sintering of alumina hybrid nancomposites to high relative density, while retaining the small grain size of the matrix. This includes Al 2 O 3 -SiC-CNTs [32,40,41,42,43], Alumina-GNPs-SiC [39], Alumina-Graphene-CNTs [53], Al 2 O 3 -SiCw-TiC [54,55], Al 2 O 3 -TiC-Ni [56], Al 2 O 3 -CNFs-SiC [57], and Al 2 O 3 -graphene based hybrid nanocomposites [58,59]. The majority of the performed studies were dedicated to the evaluation of mechanical properties and few researchers considered the tribological, electrical, and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

2019

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Although ceramics have many advantages when compared to metals in specific applications, they could be more widely applied if their low properties (fracture toughness, strength, and electrical and thermal conductivities) are improved. Reinforcing ceramics by two nano-phases that have different morphologies and/or properties, called the hybrid microstructure design, has been implemented to develop hybrid ceramic nanocomposites with tailored nanostructures, improved mechanical properties, and enhanced functionalities. The use of the novel spark plasma sintering (SPS) process allowed for the sintering of hybrid ceramic nanocomposite materials to maintain high relative density while also preserving the small grain size of the matrix. As a result, hybrid nanocomposite materials that have better mechanical and functional properties than those of either conventional composites or nanocomposites were produced. The development of hybrid ceramic nanocomposites is in its early stage and it is expected to continue attracting the interest of the scientific community. In the present paper, the progress made in the development of alumina hybrid nanocomposites, using spark plasma sintering, and their properties are reviewed. In addition, the current challenges and potential applications are highlighted. Finally, future prospects for developing alumina hybrid nanocomposites that have better performance are set.

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A novel approach to electroconductive ceramics filled by graphene covered nanofibers

Cited by 33 publications

References 25 publications

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

Carbon Coated Alumina Nanofiber Membranes for Selective Ion Transport

Coupled thermal analysis of carbon layers deposited on alumina nanofibres

Recent Advances and Future Prospects in Spark Plasma Sintered Alumina Hybrid Nanocomposites

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