Applied Physics A (Impact Factor: 1.7). 01/2010; 98(1):195-202. DOI: 10.1007/s00339-009-5373-1
The present work describes the field emission characteristics of nanoscale magnetic nanomaterial encapsulated multi-walled
carbon nanotubes (MWNTs) fabricated over flexible graphitized carbon cloth. Ni/MWNTs, NiFe/MWNTs and NiFeCo/MWNTs have been
synthesized by catalytic chemical vapor decomposition of methane over Mischmetal (Mm)-based AB3 (MmNi3, MmFe1.5Ni1.5 and MmFeCoNi) alloy hydride catalysts. Metal-encapsulated MWNTs exhibited superior field emission performance than pure MWNT-based
field emitters over the same substrate. The results indicate that a Ni-filled MWNT field emitter is a promising material for
practical field emission application with a lowest turn-on field of 0.6V/μm and a high emission current density of 0.3mA/cm2 at 0.9V/μm.
[Show abstract][Hide abstract] ABSTRACT: Quasi-1D α-Fe2O3 nanostructure arrays of four different morphologies (random nanoflakes, random nanobelts, quasi-aligned nanostrips and quasi-aligned nanoneedles) were successfully synthesized via a simple heating process. Field emission measurements indicate that the α-Fe2O3 nanoneedle arrays are superior field emitter exhibiting low turn-on voltage, high current density, and large field-enhancement factor due to better vertical alignment and higher aspect ratio. In addition, we found that adsorbed oxygen molecules greatly hindered the field emission performance of the nanostructures. Prolonged field emission process could drive the oxygen molecules away and give rise to markedly improved and efficient α-Fe2O3 nanostructures field emitter. The improved field emission is attributed to desorption of the oxygen molecules during the field emission process.
The Journal of Physical Chemistry C 04/2011; 115(17). DOI:10.1021/jp200858g · 4.77 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Inside job: New applications of carbon materials pave the way towards greener chemical syntheses. The encapsulation of metallic Fe within CNTs improves electron transfer between the metal and the CNTs. The resulting material offers a high catalytic activity and easy magnetic separation of catalyst in the heterogeneous selective oxidation of cyclohexane.
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