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12/14/2007
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The race for high conductivity heats up.
The conductivity of MoSi nanowires is thought to be limited by defects and imperfections. With improved processing techniques the conductivity of MoSI material has increased more than thousand fold in three years since the material was first synthesised in bulk quantities, until recently reaching values of 10 S/m. In a new development, Maagnus Hummelgard and Hakan Olid from Sweden have repeatedly achieved dramatic improvements in conductivity, with the current best value of 80 000 S/m and cricital current densities of more than 10^6 amperes per square centimeter. They achoeved this by passing high currents through nanowires using a specially modified transmission electron microscope insert.
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12/12/2007
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MoSIx sensor demonstrated
Mo6S3I6 nanowire networks change their resistance in response to the presence of analyte vapors. The vapor sensing behaviour is quantitatively described very well phenomenologically in terms of the concentration of adsorbed analyte molecules in the contact tunneling junctions. The time-response of the sensor is observed to follow simple adsorption-desorption kinetics. The network sensor shows very clear selectivity, whereby the response is related to the dipole moment of the analyte. The response function favours rapid detection of small analyte concentrations. The work is described in the American Chemical Society journal Chemistry of Materials (to appear in early 2008)
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12/11/2007
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Field emission from large area MoSI emitters
Vertically aligned bundles of molybdenum-sulphur-iodine nanowires (MoSIx) were
grown on a molybdenum foil, thin wire and quartz substrate. By choosing different growth parameters
we have been able to vary the surface density from ~0.01 to 0.5 bundles/µm2 and the length of the
nanowire bundles from ~30 µm - 15 mm. In the case of growth on molybdenum, resistivity
measurements show that a good electrical contact exists between the bundles and the metal substrate.
Published online today, 11
December 2007, in Journal of Applied Physics (Vol.102, Issue 11):
DOI: 10.1063/1.2820009
The nanowires are found to have excellent field emission properties, competitive with state-of-the-art
carbon nanotube large-area field emitters.
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6/10/2007
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Optical limiting behaviour of MoSI nanowires
Experiments performed using the open aperture Z-scan technique at 532 nm and 1064 nm show optical limiting behaviour of Mo6S4.5I4.5. The NLE was compared with that for a stabilized multi-walled carbon nanotube (MWNT)-polymer composite dispersion.
The uniformity of the MoSI dispersion in terms of both diameter and electronic behaviour makes MoSI nanowires of particular interest.
More details are given by Werner Blau and collaborators in Chemical Physics Letters (p.435 (2007) p.109.)
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5/8/2007
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Remarkable mechanical properties on the nanoscale have been demonstrated.
in a nanomechanical investigation of moSi nanowire bundles, Andras Kis and collaborators (EPFL) have shown that MoSi nanowires havesurprisingly large Young's moduli, around 420 GPa. This compares very well with the highest measured values of around 1000 GPa for SWCNTs.
The authors note that the extremely low observed shear modulus makes the materials suitable for solid stateklubricants or lubricant additive, especialy considering their good dispersion characteristics.
Reference: A.Kis et al., Small 3,1544 (2007)
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12/12/2006
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Superior dispersion characteristics of MoSI nanowires
have been reported in a number of publications by Nicolosi, Coleman,Blau and coworkers. They have reported procedures for dispersing both 6-3-6 and 6-4.5-4.5 nanowires in different solvents. They conclude that the MoSI materials have superior dispersion characteristics to CNTs and are dispersable in a wider range of solvents. Solubility in water is particularly interesting since it enables aqueus functionalisation chemistry to be performed. For a list of publications...
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7/18/2005
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New literature available
2 new papers have been published:
- Field emission of point-electron source Mo6S3I6 nanowires. M.Zumer et al., Nanotechnology 16 (2005) 1619-1622
- Atomic and Electronic Structure of Subnanometer Diameter Mo6S9-xIx Nanowires, A.Meden et al. Nanotechnology, vol. 16, (2005)
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4/1/2005
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New milestone
Solubility of Mo6S4.5I4.5 nanowires has been investigated in detail by Valeria Nilolosi and Jonathan Coleman and Werner Blau from Trinity College Dublin. In a set of two papers just published, they find that: “the nanowires are can form stable dispersions at reasonably high concentrations with the right choice of solvent. Furthermore, these materials are not nearly as susceptible to bundling as their carbon based counterparts. Together with their ease of synthesis and their mono-disperse metallic nature, these results suggest that these materials are superior to carbonnanotubes in a range of areas.” They also anticipate “that these inorganic nanowires will replace carbon nanotubes as the material of choice in areas from high strength, conductive fillers for composites to vias or interconnects”
For more information see: V. Nicolosi et al. in April 21 issue of J.Chem.Phys. (2005)
They continue: “Mo6S4.5I4.5 nanowire material is soluble at technologically useful concentrations. This allows solution based puri.cation, processing, modi.cation and analysis, in stark contrast to materials such as carbon nanotubes. As Mo6S9_xIx nanowires are thought to be electronically homogenous for a given stoichiometry they are far more useful for electronic applications than carbon nanotubes, which need to be separated by electronic type for use in many applications. We envisage their eventual use in many applications such as electronic interconnects, field emitters and fillers in advanced composite materials. In addition, self-assembly, such as occurs in solution might be useful for building circuits and devices, particularly in conjunction with electrophoretic manipulation.”
For more information see V. Nicolosi et al. / Chemical Physics Letters 401 (2005) 13–18
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3/1/2005
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New milestone
Tribology measurements on Mo6S4.5I4.5 and Mo6S3I6 nanowires by Fabrice Dassenoy and Lucille Jolly-Pottuz in the group of Martin from Ecole normlale, Lyon show ultralow friction characteristics under typical load conditions in combination with lubricating oil, with friction coeffiecient of 0.02. In a paper just published in Tribology Letters they conclude that the results on Mo6S4.5I4.5 and Mo6S3I6 nanowires “can be compared with those obtained with fullerene-like MoS2 nanoparticles tested also under boundary lubrication. They have found that this materials also give very low friction and that its properties can be compared to that of h-MoS2 ….“
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1/1/2005
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New milestone
The structure of Mo6S3I6 and Mo6S4.5I4.5 nanowires has been determined by combination of X-ray diffraction and XAFS (local probe) techniques, opening the way to functionalization. While the structure of the backbone appears to be the same, the variation in physical and chemical properties arise from the different stoichiometry.
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3/23/2004
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Buy samples online
The online order section is now available.
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3/12/2004
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Mo6 announces commercial availability of the MoSIx-6® nanomaterial
HELMOND, The Netherlands / LJUBLJANA, Slovenia, March 12, 2004 - Mo6 B.V., a leading provider of transitional metal chalcogenide-halide nanomaterials, today announced the commercial availability of its groundbreaking MoSIx-6® nanomaterial.
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2/15/2004
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Mo6 website online
Initial version of this website online. Contact, technology and application sections.
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