Carbon nanowalls and related materials

Abstract

Size, dimensionality, and shape play important roles in determining the properties of nanomaterials. So far, most of the nanomaterial researches have been focused on zero-dimensional nanoparticles/nanodots and onedimensional nanowires/nanorods/nanotubes, but very few studies have been carried out on two-dimensional nanosheets. Starting from carbon, recently we have succeeded in growing a class of nanostructured two-dimensional materials either in the pure forms or in the form of composites with carbon. In this paper, we will first briefly discuss various types of two-dimensional systems and then focus on the formation mechanism of carbon nanowalls and their field-emission and electron transport properties. The use of carbon nanowalls as templates for the formation of other types of nanomaterials will also be discussed.

Large networks of vertical multi-layer graphenes with morphology-tunable magnetoresistance

“…15 The petal-like graphene network shows a relatively low order of graphitization with quite signicant defects at ultralong edges and boundaries, where the electrons could be trapped and lead to localized states. (i.e., when the magnetic eld is parallel to the side surfaces of the graphene nanowalls), and the minimum value is found at around 90 and 270 (with the magnetic eld perpendicular to the side surfaces).…”

Morphology, Microstructure, and Hydrogen Content of Carbon Nanostructures Obtained by PECVD at Various Temperatures

“…The three kinds of carbon hybrid bonds, sp 1 , sp 2 , and sp 3 , different C-C, C-O, and C-H bonding arrangement, and dimensional network make the carbon-containing films a complex structure with a wide variety of allotropy and applications [1]. Formations like quasi-zero-dimensional (Q0D) spheres/nanoparticles [2,3], quasi-one-dimensional (Q1D) wires/rods/tubes [4,5], and quasi-two-dimensional (Q2D) walls/flakes/sheets nanocarbon were reported [6].…”

Synthesis of Vertical Graphene by Microwave Plasma Enhanced Chemical Vapor Deposition Technique

“…A notable feature of vertically oriented graphene is that the correlation between the two indices greatly deviates from that of ordinary graphitebased carbon materials. This correlation strongly suggests that vertical graphene are characterized by a high degree of graphitization in spite of the very small average size of the graphite regions [6]. Such deviation should give vertical graphene unique physical properties that might not be present in other graphite-based carbon materials.…”