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Jeon JW, Lee Y, Park GH, Kim DH, Kim DM, Kang MH, Choi SJ. Cost-effective method for fabricating carbon nanotube network transistors by reusing a 99% semiconducting carbon nanotube solution. Nanotechnology 2022; 33:24LT01. [PMID: 35259734 DOI: 10.1088/1361-6528/ac5bb8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/08/2022] [Indexed: 06/14/2023]
Abstract
Carbon nanotubes (CNTs) are one-dimensional materials that have been proposed to replace silicon semiconductors and have been actively studied due to their high carrier mobility, high current density, and high mechanical flexibility. Specifically, highly purified, pre-separated, and solution-processed semiconducting CNTs are suitable for mass production. These CNTs have advantages, such as room-temperature processing compatibility, while enabling a fast and straightforward manufacturing process. In this paper, CNT network transistors were fabricated on a total of five 8 inch wafers by reusing a highly purified and pre-separated 99% semiconductor-enriched CNT solution. The results confirmed that the density of semiconducting CNTs deposited on the five selected wafers was notably uniform, even though the CNT solution was reused up to four times after the initial CNT deposition. Moreover, there was no significant degradation in the key CNT network transistor metrics. Therefore, we believe that our findings regarding this CNT reuse method may provide additional guidance in the field of wafer-scale CNT electronics and may contribute strongly to the development of practical device applications at an ultralow cost.
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Affiliation(s)
- Ju Won Jeon
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Yongwoo Lee
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Geon-Hwi Park
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Dae Hwan Kim
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Dong Myong Kim
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
| | - Min-Ho Kang
- Department of Nano-process, National Nanofab Center (NNFC), Daejeon 34141, Republic of Korea
| | - Sung-Jin Choi
- School of Electrical Engineering, Kookmin University, Seoul 02707, Republic of Korea
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Zu G, Shimizu T, Kanamori K, Zhu Y, Maeno A, Kaji H, Shen J, Nakanishi K. Transparent, Superflexible Doubly Cross-Linked Polyvinylpolymethylsiloxane Aerogel Superinsulators via Ambient Pressure Drying. ACS Nano 2018; 12:521-532. [PMID: 29309140 DOI: 10.1021/acsnano.7b07117] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Aerogels have many attractive properties but are usually costly and mechanically brittle, which always limit their practical applications. While many efforts have been made to reinforce the aerogels, most of the reinforcement efforts sacrifice the transparency or superinsulating properties. Here we report superflexible polyvinylpolymethylsiloxane, (CH2CH(Si(CH3)O2/2))n, aerogels that are facilely prepared from a single precursor vinylmethyldimethoxysilane or vinylmethyldiethoxysilane without organic cross-linkers. The method is based on consecutive processes involving radical polymerization and hydrolytic polycondensation, followed by ultralow-cost, highly scalable, ambient-pressure drying directly from alcohol as a drying medium without any modification or additional solvent exchange. The resulting aerogels and xerogels show a homogeneous, tunable, highly porous, doubly cross-linked nanostructure with the elastic polymethylsiloxane network cross-linked with flexible hydrocarbon chains. An outstanding combination of ultralow cost, high scalability, uniform pore size, high surface area, high transparency, high hydrophobicity, excellent machinability, superflexibility in compression, superflexibility in bending, and superinsulating properties has been achieved in a single aerogel or xerogel. This study represents a significant progress of porous materials and makes the practical applications of transparent flexible aerogel-based superinsulators realistic.
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Affiliation(s)
- Guoqing Zu
- Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University , Shanghai 200092, People's Republic of China
| | - Taiyo Shimizu
- Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yang Zhu
- Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Ayaka Maeno
- Institute for Chemical Research, Kyoto University , Gokasho, Uji, Kyoto 611-0011, Japan
| | - Hironori Kaji
- Institute for Chemical Research, Kyoto University , Gokasho, Uji, Kyoto 611-0011, Japan
| | - Jun Shen
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University , Shanghai 200092, People's Republic of China
| | - Kazuki Nakanishi
- Department of Chemistry, Graduate School of Science, Kyoto University , Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
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