Growth and Characterization of Carbon Nanowalls

Kazuhito NISHIMURA; Nan JIANG; Akio HIRAKI

Growth and Characterization of Carbon Nanowalls

Kazuhito NISHIMURA, Nan JIANG, Akio HIRAKI

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A type of carbon nanoform (carbon nanowalls: CNWs) has been successfully deposited on both Ni wafers and Ni wires using dc plasma chemical-vapor-deposition (CVD) method. Transmission electron microscopy (TEM) and Raman spectroscopy were used to characterize CNWs' microstructure. It is found that CNWs are well crystallized, and each CNW consists of several pieces of curved graphene sheets, presenting a quasi-two-dimensional geometry. The average length and width of CNWs are about 2-4µm, while their thickness is less than 7nm. Field emission measurement showed that such CNW films exhibited the excellent electron emission efficiency, comparable to the high-grade carbon nanotube (CNT) emitters. The threshold field defined as the field to obtained 1µA/cm² is less than 1V/µm and the electrical field for 1mA/cm² current density is only about 1.5V/µm. Moreover, the CNWs have stable emission behaviors, and we have successfully fabricated a kind of high-brightness lamps based on the CNW coated Ni wires.

Publication: IEICE TRANSACTIONS on Electronics Vol.E86-C No.5 pp.821-824

Publication Date: 2003/05/01

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Type of Manuscript: Special Section PAPER (Special Issue on Field Electron Emission from Carbon Materials)

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Kazuhito NISHIMURA, Nan JIANG, Akio HIRAKI, "Growth and Characterization of Carbon Nanowalls" in IEICE TRANSACTIONS on Electronics, vol. E86-C, no. 5, pp. 821-824, May 2003, doi: .
Abstract: A type of carbon nanoform (carbon nanowalls: CNWs) has been successfully deposited on both Ni wafers and Ni wires using dc plasma chemical-vapor-deposition (CVD) method. Transmission electron microscopy (TEM) and Raman spectroscopy were used to characterize CNWs' microstructure. It is found that CNWs are well crystallized, and each CNW consists of several pieces of curved graphene sheets, presenting a quasi-two-dimensional geometry. The average length and width of CNWs are about 2-4µm, while their thickness is less than 7nm. Field emission measurement showed that such CNW films exhibited the excellent electron emission efficiency, comparable to the high-grade carbon nanotube (CNT) emitters. The threshold field defined as the field to obtained 1µA/cm² is less than 1V/µm and the electrical field for 1mA/cm² current density is only about 1.5V/µm. Moreover, the CNWs have stable emission behaviors, and we have successfully fabricated a kind of high-brightness lamps based on the CNW coated Ni wires.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e86-c_5_821/_p

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@ARTICLE{e86-c_5_821,
author={Kazuhito NISHIMURA, Nan JIANG, Akio HIRAKI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Growth and Characterization of Carbon Nanowalls},
year={2003},
volume={E86-C},
number={5},
pages={821-824},
abstract={A type of carbon nanoform (carbon nanowalls: CNWs) has been successfully deposited on both Ni wafers and Ni wires using dc plasma chemical-vapor-deposition (CVD) method. Transmission electron microscopy (TEM) and Raman spectroscopy were used to characterize CNWs' microstructure. It is found that CNWs are well crystallized, and each CNW consists of several pieces of curved graphene sheets, presenting a quasi-two-dimensional geometry. The average length and width of CNWs are about 2-4µm, while their thickness is less than 7nm. Field emission measurement showed that such CNW films exhibited the excellent electron emission efficiency, comparable to the high-grade carbon nanotube (CNT) emitters. The threshold field defined as the field to obtained 1µA/cm² is less than 1V/µm and the electrical field for 1mA/cm² current density is only about 1.5V/µm. Moreover, the CNWs have stable emission behaviors, and we have successfully fabricated a kind of high-brightness lamps based on the CNW coated Ni wires.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - Growth and Characterization of Carbon Nanowalls
T2 - IEICE TRANSACTIONS on Electronics
SP - 821
EP - 824
AU - Kazuhito NISHIMURA
AU - Nan JIANG
AU - Akio HIRAKI
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E86-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 2003
AB - A type of carbon nanoform (carbon nanowalls: CNWs) has been successfully deposited on both Ni wafers and Ni wires using dc plasma chemical-vapor-deposition (CVD) method. Transmission electron microscopy (TEM) and Raman spectroscopy were used to characterize CNWs' microstructure. It is found that CNWs are well crystallized, and each CNW consists of several pieces of curved graphene sheets, presenting a quasi-two-dimensional geometry. The average length and width of CNWs are about 2-4µm, while their thickness is less than 7nm. Field emission measurement showed that such CNW films exhibited the excellent electron emission efficiency, comparable to the high-grade carbon nanotube (CNT) emitters. The threshold field defined as the field to obtained 1µA/cm² is less than 1V/µm and the electrical field for 1mA/cm² current density is only about 1.5V/µm. Moreover, the CNWs have stable emission behaviors, and we have successfully fabricated a kind of high-brightness lamps based on the CNW coated Ni wires.
ER -