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- Cao, Yu, 1969, et al.
(författare)
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Investigation of Ni/Ta contacts on 4H silicon carbide
- 2007
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Ingår i: Applied Surface Science. - : Elsevier BV. - 0169-4332. ; 254:1 SPEC. ISS., s. 139-142
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Tidskriftsartikel (refereegranskat)abstract
- Nickel and Tantalum thin films with 3:5 thickness ratios were deposited in succession onto 4H–SiC substrate at room temperature. The sampleswere then heated in situ in vacuum at 650, 800 or 950 8C for 30 min. Glancing angle X-ray diffraction (XRD), Auger electron spectroscopy (AES)and current–voltage (I–V) technique were used for characterising the interfacial reactions and electrical properties. Amorphous Ni–Ta can beformed by solid-state reaction at 650 8C. The minor dissolved Ni in the Ta metal promotes the reaction between Ta and SiC. With increasingannealing temperature up to 950 8C, the dominant carbide changes from Ta2C to TaC and a layer structure is developed. Electrical measurementsshow that ohmic contact is formed after annealing at or above 800 8C.
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| 4. |
- Gromov, Andrei, 1959, et al.
(författare)
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Covalent Amino functionalisation of single walled carbon nanotubes
- 2005
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Ingår i: J. Materials Chem. - : Royal Society of Chemistry (RSC). - 0959-9428 .- 1364-5501. ; 15, s. 3334-3339
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Tidskriftsartikel (refereegranskat)abstract
- Chemical transformation of single-wall carbon nanotubes (SWNT), edge-terminated with carboxylic groups, to SWNT species with amino groups directly attached to the tube open ends has been performed. Different synthetic approaches have been investigated. The reaction products were characterised by FTIR, Raman spectroscopy, XPS and SEM.
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| 5. |
- Méndez-Romero, Ulises A., et al.
(författare)
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Functionalized reduced graphene oxide with tunable band gap and good solubility in organic solvents
- 2019
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Ingår i: Carbon. - : Elsevier BV. - 0008-6223. ; 146, s. 491-502
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Tidskriftsartikel (refereegranskat)abstract
- The materials intended for organic photovoltaics and organic electronics require specific properties, such as conjugation along backbones, good solubility in organic solvents and a suitable band gap. Graphene oxide holds a high indirect optical band gap of 3 eV and a hydrophilic behavior. However, based on the fact that the graphene oxide band gap is related to the C/O ratio, chemical reduction and functionalization must be performed to obtain the proper characteristics that are required for organic applications. Here an efficient approach for chemically modified graphene oxide as a low-cost alternative for organic semiconductor materials was developed. The two synthesized materials (functionalized reduced graphene oxide and functionalized reduced graphene oxide decorated with silver nanoparticles) exhibited a 65% and 52% band gap decrease respectively, compared to graphene oxide. Moreover, both materials were soluble in organic solvents at high concentrations [10 mg mL −1 ], turning them suitable for many applications, including organic electronics, with the additional advantage of being a solution process avoiding restacking of layers.
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