Vapor-Phase Grown Bundles of Carbon Nanotubes

1994 ◽  
Vol 349 ◽  
Author(s):  
Maohui Ge ◽  
Klaus Sattler
Keyword(s):  
Carbon Nanotubes ◽  
Surface Structure ◽  
Vapor Phase ◽  
Pyrolytic Graphite ◽  
Atomic Resolution ◽  
Highly Oriented Pyrolytic Graphite ◽  
Stm Images

We have produced bundles of nanotubes by vapor-phase condensation of carbon on highly-oriented pyrolytic graphite (HOPG). The bundles are found to have widths between 15 nm and 50 nm, and up to 200 nm long. They are composed of concentric tubules with 2-4 nm in diameter. Atomic resolution STM images reveal their graphitic surface structure.

Surface Superstructure of Carbon Nanotubes on Highly Oriented Pyrolytic Graphite Annealed at Elevated Temperatures

1998 ◽  
Vol 37 (Part 1, No. 6B) ◽  
pp. 3809-3811 ◽  
Author(s):  
Bai An ◽  
Seiji Fukuyama ◽  
Kiyoshi Yokogawa ◽  
Masamichi Yoshimura
Keyword(s):  
Carbon Nanotubes ◽  
Elevated Temperatures ◽  
Pyrolytic Graphite ◽  
Highly Oriented Pyrolytic Graphite

Confined Growth of Carbon Nanotubes in Nanocutting Channel on Highly Oriented Pyrolytic Graphite

NANO ◽  
2018 ◽  
Vol 13 (06) ◽  
pp. 1850071
Author(s):  
Yuan Sang ◽  
Chuanhong Jin ◽  
Muhammed Habib ◽  
Li Song
Keyword(s):  
Carbon Nanotubes ◽  
Pyrolytic Graphite ◽  
Metal Particles ◽  
High Symmetry ◽  
Ni Nanoparticles ◽  
Highly Oriented Pyrolytic Graphite ◽  
Controllable Synthesis ◽  
Confined Growth ◽  
Synthesis Of Carbon Nanotubes ◽  
Graphene Edge

Graphite surface can be etched by metal particles because of the catalytic hydrogenation, resulting in unique etching channels along crystallographic high-symmetry directions that provide new possibilities for confinement applications. Herein, we demonstrate a confined growth carbon nanotubes (CNT) inside nanocutting channels on the surface of highly oriented pyrolytic graphite (HOPG). In particular, nickel (Ni) nanoparticles were used as catalytic knife to cut HPOG for creating channels with both zig-zag and armchair graphene edge types. Subsequently, multiwall CNTs were grown along the edge inside channels by reacting Ni nanoparticles catalyzing. It was found that the CNTs inside channels could be grown together along same orientation instead of aggregation, which may bring out a new idea on the controllable synthesis of carbon nanotubes.

STM STUDY OF A SELF-ASSEMBLY BEHAVIOR OF PHTHALOCYANINE AND 1-BROMOHEXADECANE ON HIGHLY ORIENTED PYROLYTIC GRAPHITE

2006 ◽  
Vol 05 (06) ◽  
pp. 877-882
Author(s):  
WU YANG ◽  
WEILIAN LV ◽  
LILI BO ◽  
XIAOYAN HE ◽  
GANG NI ◽  
...  
Keyword(s):  
Self Assembly ◽  
Substrate Surface ◽  
Pyrolytic Graphite ◽  
Molar Ratio ◽  
Highly Oriented Pyrolytic Graphite ◽  
Molar Ratios ◽  
Molecular Features ◽  
Planar Molecules ◽  
Assembly Behavior ◽  
Stm Images

In this paper, we present the results of using alkane derivatives to assist in the adsorption of planar molecules by employing 1-bromohexadecane( C 16 Br ) and phthalocyanine (Pc) as examples. Their assembly behaviors have been well resolved on the observed STM images. The observations presented in this work demonstrate that single molecular arrays of Pc can be obtained with a template of C 16 Br on highly oriented pyrolytic graphite (HOPG) substrate surface to allow high-resolution STM studies. Binary mixtures of different molar ratios were also observed. By adjusting the molar ratio of Pc to C 16 Br to about 1:3–1:4, uniform assembly can become dominative on the surface. The resulting high stability and the well ordered assembly are attributed to the increased adsorption barrier of alkanes. This approach could be adapted to the studies of other molecules to observe molecular features and could be helpful in obtaining two-dimensional assemblies of monodispersed molecules, especially planar molecules.

ORGANOMETALLIC NANOSTRUCTURES OF 1,4-DIBROMO-2,5-DIIODOBENZENE BY METAL IONS CONSTRUCTION ON HOPG SURFACE

2016 ◽  
Vol 23 (04) ◽  
pp. 1650020 ◽  
Author(s):  
WEI LI ◽  
ZHONGPING WANG ◽  
XINLI LENG ◽  
YAN LU ◽  
XIAOQING LIU ◽  
...  
Keyword(s):  
Metal Ions ◽  
Scanning Tunneling Microscopy ◽  
Halogen Bond ◽  
Pyrolytic Graphite ◽  
Scanning Tunneling ◽  
Highly Oriented Pyrolytic Graphite ◽  
Tunneling Microscopy ◽  
Valence States ◽  
Different Shapes ◽  
Stm Images

Different organometallic nanostructures on highly oriented pyrolytic graphite (HOPG) have been synthesized by different metal ions coordinating with 1,4-Dibromo-2,5-diiodobenzene (C6H2Br2I2). Scanning tunneling microscopy (STM) images directly demonstrated the transformation of the nanostructure from self-assembled nanostructures formed by C6H2Br2I2 through halogen bond into organometallic network, formed by the dehalogenated C6H2Br2I2 molecules covalent bonded with metal ions. Moreover, by varying the concentrations of C6H2Br2I2 molecules or valence states of metal ions, organometallic structures with different shapes and sizes have been fabricated, which illustrates that the concentrations and valence states of the metal ions play important roles in the organometallic nanostructures.

Effects of Wet Chemical Oxidation on Surface Functionalization and Morphology of Highly Oriented Pyrolytic Graphite

2020 ◽  
Author(s):  
Mikhail Trought ◽  
Isobel Wentworth ◽  
Timothy Leftwich ◽  
Kathryn Perrine
Keyword(s):  
Surface Functionalization ◽  
Functional Group ◽  
Pyrolytic Graphite ◽  
Surface Oxidation ◽  
Chemical Oxidation ◽  
Synthesis Methods ◽  
Acid Solutions ◽  
Highly Oriented Pyrolytic Graphite ◽  
Wet Chemical ◽  
Surface Morphologies

The knowledge of chemical functionalization for area selective deposition (ASD) is crucial for designing the next generation heterogeneous catalysis. Surface functionalization by oxidation was studied on the surface of highly oriented pyrolytic graphite (HOPG). The HOPG surface was exposed to with various concentrations of two different acids (HCl and HNO3). We show that exposure of the HOPG surface to the acid solutions produce primarily the same -OH functional group and also significant differences the surface topography. Mechanisms are suggested to explain these strikingly different surface morphologies after surface oxidation. This knowledge can be used to for ASD synthesis methods for future graphene-based technologies.

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