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Titolo:
Growth of single-wall carbon nanotubes dependent on laser power density and ambient gas pressure during room-temperature CO2 laser vaporization
Autore:
Kokai, F; Takahashi, K; Kasuya, D; Yudasaka, M; Iijima, S;
Indirizzi:
Inst Res & Innovat, Kashiwa, Chiba 2770861, Japan Inst Res & Innovat Kashiwa Chiba Japan 2770861 hiwa, Chiba 2770861, Japan Meijo Univ, Dept Phys, Tenpaku Ku, Nagoya, Aichi 4688502, Japan Meijo Univ Nagoya Aichi Japan 4688502 ku Ku, Nagoya, Aichi 4688502, Japan NEC Corp Ltd, JST ICORP Nantubelites Project, Tsukuba, Ibaraki 3058601, Japan NEC Corp Ltd Tsukuba Ibaraki Japan 3058601 sukuba, Ibaraki 3058601, Japan NEC Corp Ltd, Tsukuba, Ibaraki 3058601, Japan NEC Corp Ltd Tsukuba Ibaraki Japan 3058601 sukuba, Ibaraki 3058601, Japan
Titolo Testata:
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
fascicolo: 4, volume: 73, anno: 2001,
pagine: 401 - 407
SICI:
0947-8396(200110)73:4<401:GOSCND>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
CO2-LASER VAPORIZATION; DYNAMICS; ABLATION; PARTICLES; EMISSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Kokai, F Inst Res & Innovat, 1201 Takada, Kashiwa, Chiba 2770861, Japan Inst Res & Innovat 1201 Takada Kashiwa Chiba Japan 2770861 Japan
Citazione:
F. Kokai et al., "Growth of single-wall carbon nanotubes dependent on laser power density and ambient gas pressure during room-temperature CO2 laser vaporization", APPL PHYS A, 73(4), 2001, pp. 401-407

Abstract

Single-wall carbon nanotubes (SWNTs) were synthesized by the irradiation of 20-ms CO2 laser pulses onto a graphite-Co/Ni target at room temperature. We investigated the effect of laser power density (10-150kW/cm(2)) and ambient At gas pressure (150-760 Torr) on the abundance of SWNTs with lengths of up to about 200 nm in soot-like carbonaceous deposits. For a constant power density (30 kW/cm(2)), depending on the Ar gas pressure, SWNTs with diameters of 1.2-1.4 nm were synthesized. Expansion behavior and temperature-fall rates of clusters and/or particles in laser plumes were also analyzed byhigh-speed video imaging and temporally and spatially resolved emission spectroscopy. The temperature-fall rates were estimated to be 171-427 K/ms. The SWNT growth on the time scale of a few milliseconds appeared to be related to same features of condensing clusters and/or particles, including resident densities, collision frequencies and temperatures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 21:39:20