Carbon Nanowalls: Synthesis and Emerging Applications by Mineo Hiramatsu

By Mineo Hiramatsu

Representing the 1st textual content to hide this fascinating new quarter of analysis, this ebook will describe synthesis thoughts of CNWs, their characterization and diverse anticipated functions utilizing CNWs. Carbon-nanowalls (CNWs) could be defined as two-dimensional graphite nanostructures with edges made from stacks of airplane graphene sheets status virtually vertically at the substrate. those sheets shape a wall constitution with a excessive element ratio. The thickness of CNWs levels from a number of nm to some tens of nm. the big floor region and sharp edges of CNWs could end up priceless for a few purposes akin to electrochemical units, box electron emitters, garage fabrics for hydrogen fuel, catalyst aid. particularly, vertically status CNWs with a excessive surface-to-volume ratio, function an excellent fabric for catalyst help for gas cells and in gasoline garage materials.

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J Vac Sci Technol B 22: 1269–1272 21. Srivastava SK, Shukla AK, Vankar VD, Kumar V (2005) Growth, structure and field emission characteristics of petal like carbon nano-structured thin films. Thin Solid Films 492: 124–130 22. Wang JY, Ito T (2005) High-current-density electron emissions from nano-carbon films fabricated by high-power microwave-plasma chemical vapour deposition. Diam Relat Mater 14: 1469–1473 23. Wang JY, Teraji T, Ito T (2005) Fabrication of wrinkled carbon nano-films with excellent field emission characteristics.

Spectrum (i), which is a typical Raman spectrum of carbon nanowalls, is found to have a G band peak at 1,590 cmÀ1, which indicates the formation of a graphitized structure, and a D band peak at 1,350 cmÀ1, which corresponds to the disorder-induced phonon mode. The peak intensity of the D band is twice as high as that of the G band. The G band peak is accompanied by a shoulder peak at 1,620 cmÀ1 (D’ band). This shoulder peak is associated with finite-size graphite crystals and graphene edges. The strong and sharp D band peak and D’ band peak suggest a more nanocrystalline structure and the presence of graphene edges and defects, which are prevalent features of carbon nanowalls.

It is noted that the G band peak is accompanied by a shoulder peak at 1,620 cmÀ1. This shoulder peak is often designated as D’ band and associated with finite-size graphite crystals and graphene edges [7–9]. The strong D band peak and D’ band peak suggest a more nanocrystalline structure and presence of graphene edges and defects such as distortion, vacancies, and straining to graphitic lattices, which are prevalent features of carbon nanowalls. Compared with the carbon nanotubes, in the case of carbon nanowalls, the Raman spectrum has strong and sharp D-band peak and shoulder peak, which are due to the small graphite domains and existence of edges of graphene sheets.

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