Article
Chemistry, Multidisciplinary
Hongbin Tang, Ruizi Liu, Weijun Huang, Wei Zhu, Weijin Qian, Changkun Dong
Summary: Multi-walled carbon nanotubes (MWNTs) were grown directly on a metal substrate with the assistance of Pt using a chemical vapor deposition method. Pt was found to accelerate the decomposition of the carbon source gas, aiding in the growth of longer and higher quality MWNTs. The Pt-assisted MWNTs also exhibited improved field emission properties and stability.
Article
Chemistry, Physical
Nan Zhao, Qianru Wu, Xiuyun Zhang, Tao Yang, Dong Li, Xueting Zhang, Chen Ma, Runluan Liu, Liantao Xin, Maoshuai He
Summary: The synthesis of SWNTs from plastic polymers using chemical vapor deposition (CVD) relies on a robust Co-MgO cobalt catalyst. This method extends the potential of plastic waste as a feedstock for high-value carbon nanomaterials.
Review
Chemistry, Multidisciplinary
Peng-Xiang Hou, Feng Zhang, Lili Zhang, Chang Liu, Hui-Ming Cheng
Summary: The FCCVD is an important technique for synthesizing high-quality CNTs with various morphologies, offering advantages of simplicity, controllability, and scalability. Researchers review the controlled growth, properties, and applications of CNTs, discussing key challenges and prospects for the future.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Masaru Irita, Takahiro Yamamoto, Yoshikazu Homma
Summary: The study used photoluminescence spectroscopy to directly measure the chirality distributions of individual semiconducting SWCNTs, confirming the influence of chiral angles on the growth yield. When higher-yield chiralities are selected, the chiral angle distribution fits well with a model that incorporates the thermodynamic effect. These quantitative and statistical data provide new insights into the SWCNT growth mechanism and validate theoretical predictions.
Article
Materials Science, Ceramics
R. Fernandez-Loyola, M. Muthuvel, A. B. Hernandez-Maldonado, J. A. Menchaca-Rivera, J. F. Perez-Robles, O. Solorza-Feria, G. G. Botte
Summary: A new nanocomposite material involving multi-walled carbon nanotubes (MWCNTs) was synthesized using the traditional chemical vapor deposition (CVD) method. The morphological and structural characterization, as well as the electrochemical evaluation, indicate the potential application of these nanocomposites as efficient electrocatalysts.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Alisa R. Bogdanova, Dmitry V. Krasnikov, Eldar M. Khabushev, B. Javier A. A. Ramirez, Yakov E. Matyushkin, Albert G. Nasibulin
Summary: In this study, the effect of hydrogen on the growth of single-walled carbon nanotubes in the aerosol chemical vapor deposition process was investigated. It was shown that hydrogen inhibits the pyrolysis of ethylene, extending the synthesis parameter window. Three different regimes of hydrogen effect were distinguished: pyrolysis suppression at low concentrations, surface cleaning/activation promotion, and surface blockage/nanotube etching at high concentrations. This detailed study contributes to understanding the complex role of hydrogen and its impact on the synthesis of single-walled carbon nanotubes.
Article
Materials Science, Multidisciplinary
Shijiang Li, Chao Ruan, Qin Zhou, Dou Zhang, Xinxin Yuan, Minghai Chen, Yongfu Lian
Summary: In this study, a scalable floating catalyst chemical vapor deposition (FCCVD) method was used to synthesize single-walled carbon nanotubes (SWNTs), with Gadolinium (Gd) being used as a growth promoter. The use of Gd significantly increased the production of large-diameter SWNTs with a narrow diameter distribution and improved thermal stability, as confirmed by electron microscopy, thermogravimetric analysis, and Raman spectroscopy. This newly developed FCCVD technique enables the low-cost production of large-diameter SWNTs, which are structurally homogeneous and suitable for applications in electronic systems and electromagnetic shielding.
Article
Chemistry, Physical
Xueting Zhang, Liu Qian, Xiaojing Yao, Lili Zhang, Qianru Wu, Dong Li, Chen Ma, Nan Zhao, Liantao Xin, Chang Liu, Xiuyun Zhang, Jin Zhang, Maoshuai He
Summary: The past two decades have seen significant progress in the catalytic synthesis of single-walled carbon nanotubes (SWNTs) using non-conventional nanoparticles. This study presents the use of a solid magnesia (MgO) supported ruthenium (Ru) catalyst for chemical vapor deposition (CVD) growth of SWNTs. The results show successful synthesis of enriched (6, 5) SWNTs at high temperatures, partially attributed to the high activity of Ru clusters. The study also reveals the mechanism behind the activation of Ru clusters through charge transfer from the MgO support.
Article
Chemistry, Multidisciplinary
Luca Lavagna, Mattia Bartoli, Simone Musso, Daniel Suarez-Riera, Alberto Tagliaferro, Matteo Pavese
Summary: In this study, carbon nanotubes (CNTs) were synthesized on an oil-well cement substrate using chemical vapor deposition (CVD) method. The effect of the synthesis process on cement was thoroughly investigated, and FE-SEM, RAMAN, and X-Ray spectroscopy were used to analyze the modifications in the cementitious matrix and the unique morphological features of CNTs.
Article
Chemistry, Multidisciplinary
Haohao Dong, Liangzhu Zhang, Yongping Liao, Kai Huang, Cheng Lian, Xinghai Zhou, Zhao Zhang, Esko I. Kauppinen, Zhong-Shuai Wu
Summary: A fast and direct solvent-free patterning method is reported to fabricate shape-tailorable and flexible micro-supercapacitors (MSCs) by floating catalyst chemical vapor deposition (FCCVD). The obtained MSCs exhibit excellent areal and volumetric capacitances, along with excellent long-term cycle stability. They also show good performance uniformity and can be easily integrated via connection in parallel or series to deliver a stable high voltage and large capacitance, enabling the power of light emitting displays. Therefore, this method paves the way for directly preparing flexible, shape-customizable, and high-performance MSCs.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Chemical
Afsoon Aghaei, Maryam Shaterian, Hassan Hosseini Monfared, Afsaneh Farokhi
Summary: This study suggests that Fe/Mo catalysts supported on alumina are efficient for the growth of single-walled carbon nanotubes using chemical vapor deposition in methane. The presence of molybdenum eliminates the need for catalyst activation in hydrogen gas, reducing costs. The study also investigates the catalyst's activity and the relationship between carbon yield and growth conditions.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Maciej Gubernat, Marcel Zambrzycki
Summary: The catalytic activity of K10 montmorillonite during the CVD of carbon nanotubes was investigated, and the influence of free iron on CNT synthesis was studied. Before Fe removal, K10-Mt was covered with pyrolytic carbon deposits, while after purification, regular forms of CNT were formed. Multi-walled carbon nanotubes were observed on the surface of pure K10-Mt, and after extraction of free iron, nucleation sites for CNT growth were identified.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Physical
Grzegorz Raniszewski, Lukasz Pietrzak
Summary: Carbon nanotubes possess unique properties suitable for various sensing applications, with the ability to fill or attach to metal particles like iron by controlling the synthesis process. This study focused on the chemical vapor deposition (CVD) method to produce carbon iron nanocontainers with maximum nanoparticles to impurities ratio. The investigation included the consideration of mass flow of gases, use of scanning electron microscopy and thermogravimetric methods, and determination of optimal flow and temperature in the reactor.
Article
Materials Science, Multidisciplinary
Xuemei Lv, Yongfa Zhang, Ying Wang, Guojie Zhang, Yuqiong Zhao, Jun Liu
Summary: Carbon nanofibers/tubes were successfully formed by catalytic cracking methane using Al2O3/KOH as the catalyst precursors. The effects of pyrolysis temperature and the molar ratio of Al2O3 to KOH on the growth of carbon nanofibers/tubes were investigated. The results showed that temperature and molar ratio significantly influenced the properties of the products, with the optimal temperature being 900 degrees Celsius for the production of carbon nanofibers/tubes with diameters ranging from 50 to 150 nanometers.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Chemistry, Physical
Wen Qian Chen, Yi Heng Cheong, Xiaoxu Fu, Li Ya Ge, Andrei Veksha, Grzegorz Lisak
Summary: The study proposes a method for synthesizing GCN using Fe-assisted CCVD, resulting in higher yield and better functionality, leading to a 3D hierarchically porous material with higher specific capacitance, higher capacitance retention, and lower charge transfer resistance.
Article
Chemistry, Physical
Shunsuke Sakurai, Maho Yamada, Jinping He, Kenji Hata, Don N. Futaba
Summary: This study reports a novel hydrogen-free approach to fabricate highly active and corrosion-resistive iron-based catalysts using trace levels of noble metal nanoparticles. XPS analysis reveals that the noble metal nanoparticles can reduce iron atoms on the nanoparticle surface and exhibit catalytic activity. The catalyst is successfully used for the efficient synthesis of carbon nanotube arrays in a completely hydrogen-free chemical vapor deposition process.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Naoki Toyama, Hiroe Kimura, Naoyuki Matsumoto, Shinnosuke Kamei, Don N. Futaba, Norifumi Terui, Shigeki Furukawa
Summary: In this study, we successfully synthesised Ni/single-walled carbon nanotube using the super-growth method. Characterisation and analysis showed that the Ni nanoparticles were effectively immobilised on the surface of the SG-SWCNTs. Furthermore, the Ni/SG-SWCNTs exhibited higher activity than the Ni/graphene in the reduction reaction of 4-nitrophenol.
Article
Polymer Science
Thanh Binh Nguyen Thi, Seisuke Ata, Takahiro Morimoto, Yuto Kato, Masahiro Horibe, Takeo Yamada, Toshiya Okazaki, Kenji Hata
Summary: This study successfully improved the electrical conductivity of carbon nanotube-reinforced polycarbonate composites, significantly increasing the conductivity through post-processing annealing. After annealing, the electrical network of single-walled carbon nanotube-based polymer composites transitioned from aligned and unconnected to randomly oriented interconnected network.
Review
Chemistry, Multidisciplinary
Sijia Wu, Huajian Li, Don N. Futaba, Guohai Chen, Chen Chen, Kechen Zhou, Qifan Zhang, Miao Li, Zonglin Ye, Ming Xu
Summary: This article reviews the critical aspects of structural design and fabrication of nanocarbon materials for extreme environments, as well as their breakthroughs in the fields of wide-temperature structural-material construction, low-temperature energy storage, underwater sensing, and electronics operated at high temperatures.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Rajyashree M. Sundaram, Atsuko Sekiguchi, Takeo Yamada, Ken Kokubo, Kenji Hata
Summary: This study experimentally investigates the influence of oxygen on the electrical performances of CNT/Cu composites. By systematically varying the oxygen interface characteristics, CNT/Cu films with different oxygen functionalities were obtained. Optimizing the interfacial oxygen type and content can enhance the wetting and electrical conductivity of CNT-Cu, improving the temperature stability.
Article
Engineering, Environmental
Guohai Chen, Takashi Tsuji, Maho Yamada, Jinping He, Yoshiki Shimizu, Hajime Sakakita, Kenji Hata, Don N. Futaba, Shunsuke Sakurai
Summary: In this study, a novel design of a chemical vapor synthesis reactor using microplasma was proposed to achieve high precision synthesis of nanomaterials with potential for high productivity. By precisely controlling the start and stop steps, controlled size catalyst nanoparticles and single-walled carbon nanotubes were successfully generated.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Dewu Lin, Ying Zhou, Kazufumi Kobashi, Guohai Chen, Don N. Futaba, Kenji Hata
Summary: A microwave shock approach is reported to open the dead space within carbon nanotube bundles, resulting in an increased interstitial surface area and lithiophilic functionalization without degradation of other properties. The treated CNT films demonstrate improved cycling stability and suppression of dendritic lithium growth, showing potential for further applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Editorial Material
Engineering, Electrical & Electronic
Don N. Futaba
Summary: This paper investigates the synthesis of multilayer hexagonal boron nitride and its use in enhancing mobility in graphene heterostructures, demonstrating the material's potential as an insulator in commercial two-dimensional electronics.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Dewu Lin, Don N. Futaba, Kazufumi Kobashi, Minfang Zhang, Shun Muroga, Guohai Chen, Takashi Tsuji, Kenji Hata
Summary: A microwave-assisted, solvent-free approach is used to directly functionalize carbon nanotubes (CNTs), allowing for the design and fabrication of multifunctional nanocarbon-based materials.
Article
Materials Science, Ceramics
Taiyo Shimizu, Takeo Yamada, Naoyuki Matsumoto, Ken Kokubo, Kenji Hata
Summary: This study successfully improved the thermal stability of silicone-based aerogels by incorporating carbon nanotubes (CNTs) without sacrificing their mechanical flexibility. The CNT/polymethylsilsesquixoane (PMSQ, CH3SiO3/2) composite aerogels demonstrated improved high-temperature stability and comparable or even better deformation behavior under uniaxial compression. The use of centrifugation process preserved the native properties of PMSQ and even enhanced compressive modulus and resilience against compression.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Naoyuki Matsumoto, Hideaki Nakajima, Takahiro Morimoto, Takeo Yamada, Toshiya Okazaki, Ken Kokubo
Summary: In this study, the lock-in thermography technique (LIT) was used to visualize the single-walled carbon nanotube (CNT) networks in CNT/fluoro-rubber (FKM) composites during tensile deformation. The analysis revealed four types of CNT network modes: disconnection, recovery after disconnection, undestroyable, and no network. The quantitative analysis of the heat intensity showed that the change in resistance during strain-loading and unloading affected the disconnection and reconstruction of the conductive network. The study demonstrated the potential of LIT as a valuable tool for composite characterization and material design.
Article
Chemistry, Multidisciplinary
Dewu Lin, Shun Muroga, Hiroe Kimura, Hirokuni Jintoku, Takashi Tsuji, Kenji Hata, Guohai Chen, Don N. Futaba
Summary: Synthetic trade-offs exist in the synthesis of single-walled carbon nanotube forests, but a machine-learning regression model has been successfully used to overcome these trade-offs and improve both growth efficiency and crystallinity. The study also highlights the surprising importance of the nature of the carbon feedstock in overcoming the trade-off between crystallinity and growth efficiency. This research represents a significant advance in overcoming synthetic trade-off barriers for complex multivariable systems.
