Single-walled carbon nanotube synthesis on SiO2/Si substrates at very low pressures by the alcohol gas source method using a Pt catalyst

Mizutani, Yoshihiro; Fukuoka, Naoya; Naritsuka, Shigeya; Maruyama, Toru; Iijima, Sumio

doi:10.1016/j.diamond.2012.04.007

Cited by 21 publications

(19 citation statements)

References 10 publications

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“…The nominal thickness of Pt was fixed to be 0.2 nm, which was the optimal thickness to obtain the highest yield [4]. After deposition of catalysts in an ultra-high vacuum (UHV) chamber, the substrate temperature was increased to the growth temperature, 700ºC, under hydrogen gas flow at a pressure of 1×10 -3 Pa to prevent oxidation of catalysts.…”

Section: Methodsmentioning

confidence: 99%

Growth Mechanism of Single-Walled Carbon Nanotubes from Pt Catalysts by Alcohol Catalytic CVD

et al. 2015

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Single-walled carbon nanotube (SWCNT) growth from Pt catalysts by an alcohol gas source method, a type of cold-wall chemical vapor deposition (CVD), was investigated. Raman results showed that the diameters of SWCNTs grown from Pt were below 1.2 nm, while transmission electron microscopy (TEM) showed that the diameters of most Pt catalyst particles were above 1.2 nm. This suggests that SWCNT diameters were smaller than Pt catalysts particles. X-ray photoelectron spectroscopy measurements showed that reduction of Pt particles occurred during the SWCNT growth. Based on these experimental data, growth mechanism of SWCNTs was discussed.

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Section: Methodsmentioning

confidence: 99%

Growth Mechanism of Single-Walled Carbon Nanotubes from Pt Catalysts by Alcohol Catalytic CVD

et al. 2015

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“…The catalyst was first activated in air at 800 °C. This method produces well separated SWNTs with diameters of 0.5 to 2 nm [18][19][20][21]. Electron beam (EB) lithography was used to pattern source and drain contacts, which were deposited by EB evaporation of 30 nm of Pd or Ti.…”

Section: Methodsmentioning

confidence: 99%

Split gate and asymmetric contact carbon nanotube optical devices

et al. 2014

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Abstract.Asymmetric contacts or split gate geometries can be used to obtain rectification, electroluminescence (EL) and photocurrent from carbon nanotube field effect transistors. Here, we report devices with both split gates and asymmetric contacts and show that device parameters can be optimised with an appropriate split gate bias, giving the ability to select the rectification direction, modify the reverse bias saturation current and the ideality factor. When operated as a photodiode, the short circuit current and open circuit voltage can be modified by the split gate bias, and the estimated power conversion efficiency was 1×10 -6. When using split gates and symmetric contacts, strong EL peaking at 0.86 eV was observed with a full width at half maximum varying between 64 and 120 meV, depending on the bias configuration.The power and quantum efficiency of the EL was estimated to be around 1×10 -6 and 1×10 -5 respectively.

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“…The nominal thickness of Pt was fixed to be 0.2 nm, which was the optimal thickness to obtain the highest yield [4]. For comparison, we carried out SWCNT growth using Co catalysts, of which the nominal thickness was set to be the optimal value, 0.1 nm.…”

Section: Methodsmentioning

confidence: 99%

Single-Walled Carbon Nanotube Growth with Narrow Diameter Distribution from Pt Catalysts by Alcohol Gas Source Method

et al. 2014

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Single-walled carbon nanotube (SWCNT) growth were carried out on SiO2/Si substrates using Pt catalysts at different temperatures, from 400ºC to 700ºC, under various ethanol pressures by an alcohol gas source method, a type of cold-wall chemical vapor deposition (CVD). Raman measurements showed that the optimal ethanol pressure decreased as the growth temperature was reduced, and that SWCNTs grew even at 400ºC by optimizing the ethanol pressure to 1×10 -5 Pa in a high vacuum system. Compared to the SWCNTs grown from Co catalysts, the diameters of SWCNTs grown from Pt were smaller, irrespective of the growth temperature. In addition, both the SWCNT diameter and the distribution became narrower by reducing the growth temperature and we obtained small-diameter SWCNTs of which the diameters were less than 1 nm using Pt catalysts.

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Single-walled carbon nanotube synthesis on SiO2/Si substrates at very low pressures by the alcohol gas source method using a Pt catalyst

Cited by 21 publications

References 10 publications

Growth Mechanism of Single-Walled Carbon Nanotubes from Pt Catalysts by Alcohol Catalytic CVD

Growth Mechanism of Single-Walled Carbon Nanotubes from Pt Catalysts by Alcohol Catalytic CVD

Split gate and asymmetric contact carbon nanotube optical devices

Single-Walled Carbon Nanotube Growth with Narrow Diameter Distribution from Pt Catalysts by Alcohol Gas Source Method

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