Download Carbon Nanowalls: Synthesis and Emerging Applications by Mineo Hiramatsu PDF

By Mineo Hiramatsu

Representing the 1st textual content to hide this intriguing new zone of study, this publication will describe synthesis innovations of CNWs, their characterization and diverse anticipated functions utilizing CNWs. Carbon-nanowalls (CNWs) might be defined as two-dimensional graphite nanostructures with edges constructed from stacks of airplane graphene sheets status virtually vertically at the substrate. those sheets shape a wall constitution with a excessive point ratio. The thickness of CNWs levels from a number of nm to some tens of nm. the massive floor quarter and sharp edges of CNWs could end up worthwhile for a couple of purposes equivalent to electrochemical units, box electron emitters, garage fabrics for hydrogen gasoline, catalyst help. particularly, vertically status CNWs with a excessive surface-to-volume ratio, function a great fabric for catalyst help for gasoline cells and in gasoline garage materials.

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However, when the sample layer is too thin, the X-rays are completely transmitted by the sample and no diffraction signal can be measured. In the case of samples with lattice planes perpendicular to the substrate such as carbon nanowall films, where stacked graphene layers are standing almost vertically on the substrate, the standard off-plane X-ray diffraction cannot be applied to measure these lattice planes. In these circumstances, in-plane X-ray diffraction is used. Grazing incidence in-plane X-ray diffraction [11] is an X-ray scattering technique where both the incident and diffracted beams are nearly parallel to the sample surface.

3a shows a typical carbon nanowall with a micrometer-high planar nanosheet structure with a relatively smooth surface M. Hiramatsu and M. 1007/978-3-211-99718-5_3, # Springer-Verlag/Wien 2010 31 32 3 Physics of Carbon Nanowalls a b 500 nm 500 nm Fig. 1 Typical SEM images of carbon nanowall films grown using (a) RF capacitively coupled plasma-enhanced CVD with H radical injection employing a mixture of C2F6 and H2 [1] – reprinted with permission from Elsevier, and (b) electron beam excited plasma-enhanced CVD employing a mixture of CH4 and H2 200 nm 2 µm 6 µm 500 nm Fig.

0V 0 –100 –200 –6 –4 –2 0 2 4 Potential (E/V) vs Ag/AgCl 6 44 3 Physics of Carbon Nanowalls employing fluorocarbon gas, carbon nanowalls exhibit occasionally super-hydrophobic property owing to the existence of fluorine atoms on the surface of carbon nanowalls, although the relative atomic composition ratio [F]/[C] on the surface of carbon nanowalls synthesized by VHF plasma-enhanced CVD with H radical injection using a C2F6/H2 mixture was on the order of 10À4 [4]. Therefore, in the case of electrochemical applications where carbon nanowalls would be immersed in water solutions, carbon nanowall samples should be subjected to suitable surface treatment in order to obtain hydrophilic surface.

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