Abstract We experimentally investigated the effect of carbon-containing reactants (C 2 H 2 ) on healing the defects in single-walled carbon nanotubes (SWCNTs) by thermal processes at high temperatures (∼1100 °C). Introducing C 2 H 2 notably improved the crystallinity of healed SWCNTs compared with the thermal process in Ar ambient without C 2 H 2 . The defect healing rate increased with increasing C 2 H 2 partial pressure, and the healing effect of C 2 H 2 was more remarkable for relatively thinner SWCNTs (<1.1 nm). Combined with the relevant theoretical work reported previously, we propose a healing model in which C 2 H 2 helps to heal the vacancy defects and increases the healing rate at high temperatures.

Carbon fibers

Thermal Treatment

10.35848/1882-0786/acaaec

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Development of Photon Upconversion Molecular Solution System That Converts Visible Lights into Shorter UV Region (< 340 nm)

The Proceedings of the Thermal Engineering Conference (2020)

Yoichi Murakami Ayumu Motooka Kazuki Niimi Atsushi Kaiho Noriko Kiyoyanagi

Photon Upconversion

Visible spectrum

10.1299/jsmeted.2020.0132

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Carbon nanotube growth from carbon nano-onion seed

The Japan Society of Applied Physics (2017)

Hiroki Semba Michiharu Arifuku Noriko Kiyoyanagi Yoshihiro Kobayashi

Carbon fibers

Source

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Effect of a protective layer on a carbon nanotube thin film channel in a biosensor device

Japanese Journal of Applied Physics (2019)

Ritsu Niimi Ryota Negishi Michiharu Arifuku Noriko Kiyoyanagi Tomohiro Yamaguchi

We investigated the effect of HfO2 film on the sensor response of a carbon nanotube thin film transistor (CNT-TFT) biosensor. Some parts of the CNT in the channel are suspended due to the formation of a network structure. The electrical noise of the CNT-TFT as a transducer is mainly caused by the structural fluctuation of the suspended CNTs in solution. We found that the electrical noise is dramatically reduced by introducing hafnium oxide (HfO2) film onto the CNT-TFT channel surface. This means that the HfO2 film has a suppression effect of fluctuation on the suspended CNTs and physical adsorption of the impurities such as non-specific molecules. We demonstrate that introducing HfO2 film is effective for the detection of thrombin molecules using the aptamer-modified CNT-TFT.

10.7567/1347-4065/ab1256

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Citations (5)

Combination effect of growth enhancers and carbon sources on synthesis of single-walled carbon nanotubes from solid carbon growth seeds

Diamond and Related Materials (2022)

Mengyue Wang Yuanjia Liu Manaka Maekawa Michiharu Arifuku Noriko Kiyoyanagi

Oxidizing agent

Nanodiamond

Carbon fibers

Amorphous carbon

10.1016/j.diamond.2022.109516

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