1
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Shin S, Song H, Shin YS, Lee J, Seo TH. Bayesian Optimization of Wet-Impregnated Co-Mo/Al 2O 3 Catalyst for Maximizing the Yield of Carbon Nanotube Synthesis. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 14:75. [PMID: 38202530 PMCID: PMC10780783 DOI: 10.3390/nano14010075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/19/2023] [Accepted: 12/23/2023] [Indexed: 01/12/2024]
Abstract
Multimetallic catalysts have demonstrated their high potential for the controlled synthesis of carbon nanotubes (CNTs), but their development requires a more complicated optimization than that of monometallic catalysts. Here, we employed Bayesian optimization (BO) to optimize the preparation of Co-Mo/Al2O3 catalyst using wet impregnation, with the goal of maximizing carbon yield in the chemical vapor deposition (CVD) synthesis of CNTs. In the catalyst preparation process, we selected four parameters to optimize: the weight percentage of metal, the ratio of Co to Mo in the catalyst, the drying temperature, and the calcination temperature. We ran two parallel BO processes to compare the performance of two types of acquisitions: expected improvement (EI), which does not consider noise, and one-shot knowledge gradient (OKG), which takes noise into account. As a result, both acquisition functions successfully optimized the carbon yield with similar performance. The result suggests that the use of EI, which has a lower computational load, is acceptable if the system has sufficient robustness. The investigation of the contour plots showed that the addition of Mo has a negative effect on carbon yield.
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Affiliation(s)
- Sangsoo Shin
- School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea; (S.S.); (H.S.); (Y.S.S.)
| | - Hyeongyun Song
- School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea; (S.S.); (H.S.); (Y.S.S.)
| | - Yeon Su Shin
- School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea; (S.S.); (H.S.); (Y.S.S.)
| | - Jaegeun Lee
- School of Chemical Engineering, Pusan National University, Busan 46241, Republic of Korea; (S.S.); (H.S.); (Y.S.S.)
- Department of Organic Material Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Tae Hoon Seo
- Green Energy and Nano Technology & R&D Group, Korea Institute of Industrial Technology (KITECH), Gwangju 61012, Republic of Korea
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2
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Kurnosov N, Karachevtsev V. Observation of hole doping of metallic carbon nanotubes contained in unsorted species by Raman spectroscopy. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Wei X, Li S, Wang W, Zhang X, Zhou W, Xie S, Liu H. Recent Advances in Structure Separation of Single-Wall Carbon Nanotubes and Their Application in Optics, Electronics, and Optoelectronics. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2200054. [PMID: 35293698 PMCID: PMC9108629 DOI: 10.1002/advs.202200054] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 02/10/2022] [Indexed: 05/04/2023]
Abstract
Structural control of single-wall carbon nanotubes (SWCNTs) with uniform properties is critical not only for their property modulation and functional design but also for applications in electronics, optics, and optoelectronics. To achieve this goal, various separation techniques have been developed in the past 20 years through which separation of high-purity semiconducting/metallic SWCNTs, single-chirality species, and even their enantiomers have been achieved. This progress has promoted the property modulation of SWCNTs and the development of SWCNT-based optoelectronic devices. Here, the recent advances in the structure separation of SWCNTs are reviewed, from metallic/semiconducting SWCNTs, to single-chirality species, and to enantiomers by several typical separation techniques and the application of the corresponding sorted SWCNTs. Based on the separation procedure, efficiency, and scalability, as well as, the separable SWCNT species, purity, and quantity, the advantages and disadvantages of various separation techniques are compared. Combined with the requirements of SWCNT application, the challenges, prospects, and development direction of structure separation are further discussed.
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Affiliation(s)
- Xiaojun Wei
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Shilong Li
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
| | - Wenke Wang
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
| | - Xiao Zhang
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Weiya Zhou
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Sishen Xie
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
| | - Huaping Liu
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- Center of Materials Science and Optoelectronics Engineeringand School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Beijing Key Laboratory for Advanced Functional Materials and Structure ResearchBeijing100190China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
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4
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Koji H, Kusumoto Y, Hatta A, Furuta H. Formation of Thermally Stable, High-Areal-Density, and Small-Diameter Catalyst Nanoparticles via Intermittent Sputtering Deposition for the High-Density Growth of Carbon Nanotubes. NANOMATERIALS 2022; 12:nano12030365. [PMID: 35159710 PMCID: PMC8838723 DOI: 10.3390/nano12030365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 02/01/2023]
Abstract
We report the formation of thermally stable catalyst nanoparticles via intermittent sputtering deposition to prevent the agglomeration of the nanoparticles during thermal chemical vapor deposition (CVD) and for the high-density growth of carbon nanotubes (CNTs). The preparation of high-areal-density and small-diameter catalyst nanoparticles on substrates for the high-density growth of CNTs is still a challenging issue because surface diffusion and Ostwald ripening of the nanoparticles induce agglomeration, which results in the low-density growth of large-diameter CNTs during high-temperature thermal CVD. Enhancing the adhesion of nanoparticles or suppressing their diffusion on the substrate to retain a small particle diameter is desirable for the preparation of thermally stable, high-areal-density, and small-diameter catalyst nanoparticles. The intermittent sputtering method was employed to deposit Ni and Fe metal nanoparticles on a substrate for the synthesis of high-areal-density CNTs for Fe nanoparticle catalyst films. The metal particles deposited via intermittent sputtering with an interval time of over 30 s maintained their areal densities and diameters during the thermal CVD process in a vacuum for CNT synthesis. An interval of over 30 s was expected to oxidize the metal particles, which resulted in thermal stability during the CVD process. The intermittent sputtering method is thus a candidate process for the preparation of thermally stable catalyst films for the growth of a high density of long CNTs, which can be combined with the present CNT production process.
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Affiliation(s)
- Hirofumi Koji
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan; (Y.K.); (A.H.)
- National Institute of Technology, Kitakyushu College, 5-20-1 Shii, Kokuraminami-ku, Kitakyushu, Fukuoka 802-0985, Japan
- Correspondence: (H.K.); (H.F.)
| | - Yuji Kusumoto
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan; (Y.K.); (A.H.)
| | - Akimitsu Hatta
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan; (Y.K.); (A.H.)
- Center for Nanotechnology, Research Institute, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan
| | - Hiroshi Furuta
- School of Systems Engineering, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan; (Y.K.); (A.H.)
- Center for Nanotechnology, Research Institute, Kochi University of Technology, 185 Miyanokuchi, Kami, Kochi 782-8502, Japan
- Correspondence: (H.K.); (H.F.)
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5
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Carbon nanotube membranes – Strategies and challenges towards scalable manufacturing and practical separation applications. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117929] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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6
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Zhao X, Liu X, Yang F, Liu Q, Zhang Z, Li Y. Graphene oxide-supported cobalt tungstate as catalyst precursor for selective growth of single-walled carbon nanotubes. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01114b] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Graphene oxide-supported uniform cobalt tungstate nanoparticles (CoWO4/GO) were prepared, which can be used as catalyst precursors for the diameter-controlled growth of single-walled carbon nanotubes (SWCNTs).
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Affiliation(s)
- Xue Zhao
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
| | - Xiyan Liu
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
| | - Feng Yang
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
| | - Qidong Liu
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
| | - Zeyao Zhang
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
| | - Yan Li
- Beijing National Laboratory for Molecular Science
- Key Laboratory for the Physics and Chemistry of Nanodevices
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
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7
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He M, Zhang S, Zhang J. Horizontal Single-Walled Carbon Nanotube Arrays: Controlled Synthesis, Characterizations, and Applications. Chem Rev 2020; 120:12592-12684. [PMID: 33064453 DOI: 10.1021/acs.chemrev.0c00395] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Single-walled carbon nanotubes (SWNTs) emerge as a promising material to advance carbon nanoelectronics. However, synthesizing or assembling pure metallic/semiconducting SWNTs required for interconnects/integrated circuits, respectively, by a conventional chemical vapor deposition method or by an assembly technique remains challenging. Recent studies have shown significant scientific breakthroughs in controlled SWNT synthesis/assembly and applications in scaled field effect transistors, which are a critical component in functional nanodevices, thereby rendering the horizontal SWNT array an important candidate for innovating nanotechnology. This review provides a comprehensive analysis of the controlled synthesis, surface assembly, characterization techniques, and potential applications of horizontally aligned SWNT arrays. This review begins with the discussion of synthesis of horizontally aligned SWNTs with regulated direction, density, structure, and theoretical models applied to understand the growth results. Several traditional procedures applied for assembling SWNTs on target surface are also briefly discussed. It then discusses the techniques adopted to characterize SWNTs, ranging from electron/probe microscopy to various optical spectroscopy methods. Prototype applications based on the horizontally aligned SWNTs, such as interconnects, field effect transistors, integrated circuits, and even computers, are subsequently described. Finally, this review concludes with challenges and a brief outlook of the future development in this research field.
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Affiliation(s)
- Maoshuai He
- State Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Shuchen Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jin Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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8
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Lee JH, Kim HS, Yun ET, Ham SY, Park JH, Ahn CH, Lee SH, Park HD. Vertically Aligned Carbon Nanotube Membranes: Water Purification and Beyond. MEMBRANES 2020; 10:membranes10100273. [PMID: 33023144 PMCID: PMC7601676 DOI: 10.3390/membranes10100273] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/24/2020] [Accepted: 10/01/2020] [Indexed: 12/07/2022]
Abstract
Vertically aligned carbon nanotube (VACNT) membranes have attracted significant attention for water purification owing to their ultra-high water permeability and antibacterial properties. In this paper, we critically review the recent progresses in the synthesis of VACNT arrays and fabrication of VACNT membrane methods, with particular emphasis on improving water permeability and anti-biofouling properties. Furthermore, potential applications of VACNT membranes other than water purification (e.g., conductive membranes, electrodes in proton exchange membrane fuel cells, and solar electricity–water generators) have been introduced. Finally, future outlooks are provided to overcome the limitations of commercialization and desalination currently faced by VACNT membranes. This review will be useful to researchers in the broader scientific community as it discusses current and new trends regarding the development of VACNT membranes as well as their potential applications.
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Affiliation(s)
- Jeong Hoon Lee
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02855, Korea; (J.H.L.); (E.-T.Y.); (S.-Y.H.); (C.H.A.)
| | - Han-Shin Kim
- Korea Institute of Civil Engineering and Building Technology (KICT), Goyang 10223, Gyeonggi-do, Korea;
| | - Eun-Tae Yun
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02855, Korea; (J.H.L.); (E.-T.Y.); (S.-Y.H.); (C.H.A.)
| | - So-Young Ham
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02855, Korea; (J.H.L.); (E.-T.Y.); (S.-Y.H.); (C.H.A.)
| | - Jeong-Hoon Park
- Clean Innovation Technology Group, Korea Institute of Industrial Technology (KITECH), Jeju-si 63243, Korea;
| | - Chang Hoon Ahn
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02855, Korea; (J.H.L.); (E.-T.Y.); (S.-Y.H.); (C.H.A.)
| | - Sang Hyup Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea;
| | - Hee-Deung Park
- School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02855, Korea; (J.H.L.); (E.-T.Y.); (S.-Y.H.); (C.H.A.)
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 02841, Korea;
- Correspondence: ; Tel.: +82-2-3290-4861; Fax: +82-2-3290-5999
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9
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Yang F, Wang M, Zhang D, Yang J, Zheng M, Li Y. Chirality Pure Carbon Nanotubes: Growth, Sorting, and Characterization. Chem Rev 2020; 120:2693-2758. [PMID: 32039585 DOI: 10.1021/acs.chemrev.9b00835] [Citation(s) in RCA: 146] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Single-walled carbon nanotubes (SWCNTs) have been attracting tremendous attention owing to their structure (chirality) dependent outstanding properties, which endow them with great potential in a wide range of applications. The preparation of chirality-pure SWCNTs is not only a great scientific challenge but also a crucial requirement for many high-end applications. As such, research activities in this area over the last two decades have been very extensive. In this review, we summarize recent achievements and accumulated knowledge thus far and discuss future developments and remaining challenges from three aspects: controlled growth, postsynthesis sorting, and characterization techniques. In the growth part, we focus on the mechanism of chirality-controlled growth and catalyst design. In the sorting part, we organize and analyze existing literature based on sorting targets rather than methods. Since chirality assignment and quantification is essential in the study of selective preparation, we also include in the last part a comprehensive description and discussion of characterization techniques for SWCNTs. It is our view that even though progress made in this area is impressive, more efforts are still needed to develop both methodologies for preparing ultrapure (e.g., >99.99%) SWCNTs in large quantity and nondestructive fast characterization techniques with high spatial resolution for various nanotube samples.
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Affiliation(s)
- Feng Yang
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Meng Wang
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Daqi Zhang
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Juan Yang
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ming Zheng
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Yan Li
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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10
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Kwon H, Han DJ, Lee BY. All-solid-state flexible supercapacitor based on nanotube-reinforced polypyrrole hollowed structures. RSC Adv 2020; 10:41495-41502. [PMID: 35516535 PMCID: PMC9057791 DOI: 10.1039/d0ra08064k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Accepted: 11/03/2020] [Indexed: 11/21/2022] Open
Abstract
Nanotube-reinforced polypyrrole nanowires with hollowed cavities allow the fabrication of a flexible supercapacitor with a large specific capacitance.
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Affiliation(s)
- Hyungho Kwon
- Department of Mechanical Engineering
- Korea University
- Seoul 02841
- Korea
| | - Dong Jin Han
- Department of Mechanical Engineering
- Korea University
- Seoul 02841
- Korea
| | - Byung Yang Lee
- Department of Mechanical Engineering
- Korea University
- Seoul 02841
- Korea
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11
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Cui K, Wardle BL. Breakdown of Native Oxide Enables Multifunctional, Free-Form Carbon Nanotube-Metal Hierarchical Architectures. ACS APPLIED MATERIALS & INTERFACES 2019; 11:35212-35220. [PMID: 31514497 DOI: 10.1021/acsami.9b08290] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Passive oxide layers on metal substrates impose remarkable interfacial resistance for electron and phonon transport. Here, a scalable surface activation process is presented for the breakdown of the passive oxide layer and the formation of nanowire/nanopyramid structured surfaces on metal substrates, which enables high-efficiency catalysis of high-crystallinity carbon nanotubes (CNTs) and the direct integration of the CNT-metal hierarchical architectures with flexible free-form configurations. The CNT-metal hierarchical architecture facilitates a dielectric free-energy-carrier transport pathway and blocks the reformation of passive oxide layer, and thus demonstrates a 5-fold decrease in interfacial electrical resistance with 66% increase in specific surface area compared with those without surface activation. Moreover, the CNT-metal hierarchical architectures demonstrate omnidirectional blackbody photoabsorption with the reflectance of 1 × 10-5 over the range from ultraviolet to terahertz region, which is 1 order of magnitude lower than that of any previously reported broadband absorber material. The synergistically incorporated CNT-metal hierarchical architectures offer record-high broadband optical absorption with excellent electrical and structural properties as well as industrial-scale producibility.
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Affiliation(s)
- Kehang Cui
- Department of Aeronautics and Astronautics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02134 , United States
| | - Brian L Wardle
- Department of Aeronautics and Astronautics , Massachusetts Institute of Technology , Cambridge , Massachusetts 02134 , United States
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12
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Fukuhara S, Misawa M, Shimojo F, Shibuta Y. Ab initio molecular dynamics simulation of ethanol dissociation reactions on alloy catalysts in carbon nanotube growth. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136619] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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An H, Kumamoto A, Xiang R, Inoue T, Otsuka K, Chiashi S, Bichara C, Loiseau A, Li Y, Ikuhara Y, Maruyama S. Atomic-scale structural identification and evolution of Co-W-C ternary SWCNT catalytic nanoparticles: High-resolution STEM imaging on SiO 2. SCIENCE ADVANCES 2019; 5:eaat9459. [PMID: 31236457 PMCID: PMC6587631 DOI: 10.1126/sciadv.aat9459] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 04/15/2019] [Indexed: 05/05/2023]
Abstract
Recently, W-based catalysts have provided a promising route to synthesize single-walled carbon nanotubes (SWCNTs) with specific chirality, but the mechanism of the growth selectivity is vaguely understood. We propose a strategy to identify the atomic structure as well as the structure evolution of the Co-W-C ternary SWCNT catalyst. The key is to use a thin SiO2 film as the catalyst support and observation window. As the catalyst is uniformly prepared on this SiO2 film and directly used for the SWCNT synthesis, this method has an advantage over conventional methods: it creates an opportunity to obtain original, statistical, and dynamic understanding of the catalyst. As a technique, atomic-scale imaging directly on SiO2 serves as a powerful and versatile tool to investigate nanocrystals and high-temperature reactions; for the synthesis of SWCNTs, this work successfully visualizes the structure and evolution of the catalyst and illuminates the possible nucleation sites of the chirality-specific growth.
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Affiliation(s)
- Hua An
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
| | - Akihito Kumamoto
- Institute of Engineering Innovation, University of Tokyo, Tokyo 113-8656, Japan
| | - Rong Xiang
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
| | - Taiki Inoue
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
| | - Keigo Otsuka
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
| | - Shohei Chiashi
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
| | | | - Annick Loiseau
- Laboratoire d’Etude des Microstructures, University Paris-Saclay, CNRS-ONERA, BP72, 92322 Chatillon Cedex, France
| | - Yan Li
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yuichi Ikuhara
- Institute of Engineering Innovation, University of Tokyo, Tokyo 113-8656, Japan
| | - Shigeo Maruyama
- Department of Mechanical Engineering, University of Tokyo, Tokyo 113-8656, Japan
- Energy NanoEngineering Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan
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14
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Yang F, Zhao H, Wang X, Liu X, Liu Q, Liu X, Jin C, Wang R, Li Y. Atomic Scale Stability of Tungsten–Cobalt Intermetallic Nanocrystals in Reactive Environment at High Temperature. J Am Chem Soc 2019; 141:5871-5879. [DOI: 10.1021/jacs.9b00473] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Feng Yang
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Haofei Zhao
- Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
| | - Xiaowei Wang
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xu Liu
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Qidong Liu
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiyan Liu
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chuanhong Jin
- State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Rongming Wang
- Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
| | - Yan Li
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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15
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He M, Zhang S, Wu Q, Xue H, Xin B, Wang D, Zhang J. Designing Catalysts for Chirality-Selective Synthesis of Single-Walled Carbon Nanotubes: Past Success and Future Opportunity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1800805. [PMID: 30160811 DOI: 10.1002/adma.201800805] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/09/2018] [Indexed: 06/08/2023]
Abstract
A major obstacle for the applications of single-walled carbon nanotubes (SWNTs) in electronic devices is their structural diversity, ending in SWNTs with diverse electrical properties. Catalytic chemical vapor deposition has shown great promise in directly synthesizing high-quality SWNTs with a high selectivity to specific chirality (n, m). During the growth process, the tube-catalyst interface plays crucial roles in regulating the SWNT nucleation thermodynamics and growth kinetics, ultimately governing the SWNT chirality distribution. Starting with the introduction of SWNT growth modes, this review seeks to extend the knowledge about chirality-selective synthesis by clarifying the energetically favored SWNT cap nucleation and the threshold step for SWNT growth, which describes how the tube-catalyst interface affects both the nucleus energy and the new carbon atom incorporation. Such understandings are subsequently applied to interpret the (n, m) specific growth achieved on a variety of templates, such as SWNT segments or predefined molecular seeds, transition metal (Fe, Co and Ni)-containing catalysts at low reaction temperatures, W-based alloy catalysts, and metal carbides at relatively high reaction temperatures. The up to date achievements on chirality-controlled synthesis of SWNTs is summarized and the remaining major challenges existing in the SWNT synthesis field are discussed.
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Affiliation(s)
- Maoshuai He
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Shuchen Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Qianru Wu
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Han Xue
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Benwu Xin
- School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Dan Wang
- Key Laboratory of Eco-Chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China
- State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Jin Zhang
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
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16
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Rao R, Pint CL, Islam AE, Weatherup RS, Hofmann S, Meshot ER, Wu F, Zhou C, Dee N, Amama PB, Carpena-Nuñez J, Shi W, Plata DL, Penev ES, Yakobson BI, Balbuena PB, Bichara C, Futaba DN, Noda S, Shin H, Kim KS, Simard B, Mirri F, Pasquali M, Fornasiero F, Kauppinen EI, Arnold M, Cola BA, Nikolaev P, Arepalli S, Cheng HM, Zakharov DN, Stach EA, Zhang J, Wei F, Terrones M, Geohegan DB, Maruyama B, Maruyama S, Li Y, Adams WW, Hart AJ. Carbon Nanotubes and Related Nanomaterials: Critical Advances and Challenges for Synthesis toward Mainstream Commercial Applications. ACS NANO 2018; 12:11756-11784. [PMID: 30516055 DOI: 10.1021/acsnano.8b06511] [Citation(s) in RCA: 168] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Advances in the synthesis and scalable manufacturing of single-walled carbon nanotubes (SWCNTs) remain critical to realizing many important commercial applications. Here we review recent breakthroughs in the synthesis of SWCNTs and highlight key ongoing research areas and challenges. A few key applications that capitalize on the properties of SWCNTs are also reviewed with respect to the recent synthesis breakthroughs and ways in which synthesis science can enable advances in these applications. While the primary focus of this review is on the science framework of SWCNT growth, we draw connections to mechanisms underlying the synthesis of other 1D and 2D materials such as boron nitride nanotubes and graphene.
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Affiliation(s)
- Rahul Rao
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright Patterson Air Force Base , Dayton , Ohio 45433 , United States
- UES Inc. , Dayton , Ohio 45433 , United States
| | - Cary L Pint
- Department of Mechanical Engineering , Vanderbilt University , Nashville , Tennessee 37235 United States
| | - Ahmad E Islam
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright Patterson Air Force Base , Dayton , Ohio 45433 , United States
- UES Inc. , Dayton , Ohio 45433 , United States
| | - Robert S Weatherup
- School of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , U.K
- University of Manchester at Harwell, Diamond Light Source, Didcot , Oxfordshire OX11 0DE , U.K
| | - Stephan Hofmann
- Department of Engineering , University of Cambridge , Cambridge CB3 0FA , U.K
| | - Eric R Meshot
- Physical and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 United States
| | - Fanqi Wu
- Ming-Hsieh Department of Electrical Engineering , University of Southern California , Los Angeles , California 90089 , United States
| | - Chongwu Zhou
- Ming-Hsieh Department of Electrical Engineering , University of Southern California , Los Angeles , California 90089 , United States
| | - Nicholas Dee
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Placidus B Amama
- Tim Taylor Department of Chemical Engineering , Kansas State University , Manhattan , Kansas 66506 , United States
| | - Jennifer Carpena-Nuñez
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright Patterson Air Force Base , Dayton , Ohio 45433 , United States
- UES Inc. , Dayton , Ohio 45433 , United States
| | - Wenbo Shi
- Department of Chemical and Environmental Engineering , Yale University , New Haven , Connecticut 06520 , United States
| | - Desiree L Plata
- Department of Civil and Environmental Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Evgeni S Penev
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - Boris I Yakobson
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - Perla B Balbuena
- Department of Chemical Engineering, Department of Materials Science and Engineering, Department of Chemistry , Texas A&M University , College Station , Texas 77843 , United States
| | - Christophe Bichara
- Aix-Marseille University and CNRS , CINaM UMR 7325 , 13288 Marseille , France
| | - Don N Futaba
- Nanotube Research Center , National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8565 , Japan
| | - Suguru Noda
- Department of Applied Chemistry and Waseda Research Institute for Science and Engineering , Waseda University , 3-4-1 Okubo , Shinjuku-ku, Tokyo 169-8555 , Japan
| | - Homin Shin
- Security and Disruptive Technologies Research Centre, Emerging Technologies Division , National Research Council Canada , Ottawa , Ontario K1A 0R6 , Canada
| | - Keun Su Kim
- Security and Disruptive Technologies Research Centre, Emerging Technologies Division , National Research Council Canada , Ottawa , Ontario K1A 0R6 , Canada
| | - Benoit Simard
- Security and Disruptive Technologies Research Centre, Emerging Technologies Division , National Research Council Canada , Ottawa , Ontario K1A 0R6 , Canada
| | - Francesca Mirri
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - Matteo Pasquali
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - Francesco Fornasiero
- Physical and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 United States
| | - Esko I Kauppinen
- Department of Applied Physics , Aalto University School of Science , P.O. Box 15100 , FI-00076 Espoo , Finland
| | - Michael Arnold
- Department of Materials Science and Engineering University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States
| | - Baratunde A Cola
- George W. Woodruff School of Mechanical Engineering and School of Materials Science and Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Pavel Nikolaev
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright Patterson Air Force Base , Dayton , Ohio 45433 , United States
- UES Inc. , Dayton , Ohio 45433 , United States
| | - Sivaram Arepalli
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - Hui-Ming Cheng
- Tsinghua-Berkeley Shenzhen Institute , Tsinghua University , Shenzhen 518055 , China
- Shenyang National Laboratory for Materials Science , Institute of Metal Research, Chinese Academy of Sciences , Shenyang 110016 , China
| | - Dmitri N Zakharov
- Center for Functional Nanomaterials , Brookhaven National Laboratory , Upton , New York 11973 , United States
| | - Eric A Stach
- Department of Materials Science and Engineering , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Jin Zhang
- College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Fei Wei
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering , Tsinghua University , Beijing 100084 , China
| | - Mauricio Terrones
- Department of Physics and Center for Two-Dimensional and Layered Materials , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - David B Geohegan
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Benji Maruyama
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright Patterson Air Force Base , Dayton , Ohio 45433 , United States
| | - Shigeo Maruyama
- Department of Mechanical Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan
| | - Yan Li
- College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - W Wade Adams
- Department of Materials Science and NanoEngineering , Rice University , Houston , Texas 77005 , United States
| | - A John Hart
- Department of Mechanical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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Xiang R, Maruyama S. Revisiting behaviour of monometallic catalysts in chemical vapour deposition synthesis of single-walled carbon nanotubes. ROYAL SOCIETY OPEN SCIENCE 2018; 5:180345. [PMID: 30225021 PMCID: PMC6124116 DOI: 10.1098/rsos.180345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
A catalyst is essential for the controlled synthesis of single-walled carbon nanotubes (SWNTs) by chemical vapour deposition (CVD). However, it is difficult to observe these nanosized particles in their original forms and in a statistical manner, which has resulted in a vague understanding of the behaviours of these particles. We present a technique to solve this long-standing issue. The key is to have an MEMS fabricated suspended SiO2 layer, which is thick enough to support catalyst deposition and nanotube growth but thin enough to allow electron beams to transit. On a 20 nm SiO2 film, we confirm that catalyst can be observed at an atomic resolution, and the catalyst-SWNT junctions can also be routinely observed. As a demonstration of this technique, we revisited the behaviour of monometallic catalysts through a systematic investigation of the size, chemical state and crystal structure of particles before and after high-temperature CVD. The active catalyst is found to follow a tangential growth mode, while the inactive catalyst is divided into three mechanisms: size growth, metal loss and inappropriate precipitation. The latter two mechanisms were not possible to observe by previous techniques.
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Affiliation(s)
- Rong Xiang
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
| | - Shigeo Maruyama
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
- Energy NanoEngineering Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8564, Japan
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18
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Zhao X, Yang F, Chen J, Ding L, Liu X, Yao F, Li M, Zhang D, Zhang Z, Liu X, Yang J, Liu K, Li Y. Selective growth of chirality-enriched semiconducting carbon nanotubes by using bimetallic catalysts from salt precursors. NANOSCALE 2018; 10:6922-6927. [PMID: 29594289 DOI: 10.1039/c7nr07855b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Bimetallic catalysts play important roles in the selective growth of single-walled carbon nanotubes (SWNTs). Using the simple salts (NH4)6W7O24·6H2O and Co(CH3COO)2·4H2O as precursors, tungsten-cobalt catalysts were prepared. The catalysts were composed of W6Co7 intermetallic compounds and tungsten-dispersed cobalt. With the increase of the W/Co ratio in the precursors, the content of W6Co7 was increased. Because the W6Co7 intermetallic compound can enable the chirality specified growth of SWNTs, the selectivity of the resulting SWNTs is improved at a higher W/Co ratio. At a W/Co ratio of 6 : 4 and under optimized chemical vapor deposition conditions, we realized the direct growth of semiconducting SWNTs with the purity of ∼96%, in which ∼62% are (14, 4) tubes. Using salts as precursors to prepare tungsten-cobalt bimetallic catalysts is flexible and convenient. This offers an efficient pathway for the large-scale preparation of chirality enriched semiconducting SWNTs.
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Affiliation(s)
- Xiulan Zhao
- Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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19
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Luo J, Zheng Z, Kumamoto A, Unah WI, Yan S, Ikuhara YH, Xiang X, Zu X, Zhou W. PEDOT coated iron phosphide nanorod arrays as high-performance supercapacitor negative electrodes. Chem Commun (Camb) 2018; 54:794-797. [DOI: 10.1039/c7cc09163j] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PEDOT coated iron phosphide nanorod arrays are synthesized and exhibit high areal specific capacitance and significantly improved cycling stability as negative electrodes for supercapacitors.
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Affiliation(s)
- Jinling Luo
- School of Physical Electronics
- University of Electronic Science and Technology of China
- Chengdu
- China
- Advanced Materials Research Institute
| | - Zhi Zheng
- Advanced Materials Research Institute
- University of New Orleans
- New Orleans
- USA
| | - Akihito Kumamoto
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Winifred Ini Unah
- Advanced Materials Research Institute
- University of New Orleans
- New Orleans
- USA
| | - Shuke Yan
- Advanced Materials Research Institute
- University of New Orleans
- New Orleans
- USA
| | - Yumi H. Ikuhara
- Nanostructures Research Laboratory
- Japan Fine Ceramics Center
- Nagoya 456-8587
- Japan
| | - Xia Xiang
- School of Physical Electronics
- University of Electronic Science and Technology of China
- Chengdu
- China
| | - Xiaotao Zu
- School of Physical Electronics
- University of Electronic Science and Technology of China
- Chengdu
- China
| | - Weilie Zhou
- Advanced Materials Research Institute
- University of New Orleans
- New Orleans
- USA
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20
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Ping L, Hou PX, Liu C, Li J, Zhao Y, Zhang F, Ma C, Tai K, Cong H, Cheng HM. Surface-restrained growth of vertically aligned carbon nanotube arrays with excellent thermal transport performance. NANOSCALE 2017; 9:8213-8219. [PMID: 28580987 DOI: 10.1039/c7nr01529a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A vertically aligned carbon nanotube (VACNT) array is a promising candidate for a high-performance thermal interface material in high-power microprocessors due to its excellent thermal transport property. However, its rough and entangled free tips always cause poor interfacial contact, which results in serious contact resistance dominating the total thermal resistance. Here, we employed a thin carbon cover to restrain the disorderly growth of the free tips of a VACNT array. As a result, all the free tips are seamlessly connected by this thin carbon cover and the top surface of the array is smoothed. This unique structure guarantees the participation of all the carbon nanotubes in the array in the heat transport. Consequently the VACNT array grown on a Cu substrate shows a record low thermal resistance of 0.8 mm2 K W-1 including the two-sided contact resistances, which is 4 times lower than the best result previously reported. Remarkably, the VACNT array can be easily peeled away from the Cu substrate and act as a thermal pad with excellent flexibility, adhesive ability and heat transport capability. As a result the CNT array with a thin carbon cover shows great potential for use as a high-performance flexible thermal interface material.
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Affiliation(s)
- Linquan Ping
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
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21
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Water vapor transport in carbon nanotube membranes and application in breathable and protective fabrics. Curr Opin Chem Eng 2017. [DOI: 10.1016/j.coche.2017.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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22
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Li M, Liu X, Zhao X, Yang F, Wang X, Li Y. Metallic Catalysts for Structure-Controlled Growth of Single-Walled Carbon Nanotubes. Top Curr Chem (Cham) 2017; 375:29. [DOI: 10.1007/s41061-017-0116-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/28/2017] [Indexed: 10/20/2022]
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23
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Yang F, Wang X, Si J, Zhao X, Qi K, Jin C, Zhang Z, Li M, Zhang D, Yang J, Zhang Z, Xu Z, Peng LM, Bai X, Li Y. Water-Assisted Preparation of High-Purity Semiconducting (14,4) Carbon Nanotubes. ACS NANO 2017; 11:186-193. [PMID: 28114760 DOI: 10.1021/acsnano.6b06890] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Semiconducting single-walled carbon nanotubes (s-SWNTs) with diameters of 1.0-1.5 nm (with similar bandgap to crystalline silicon) are highly desired for nanoelectronics. Up to date, the highest reported content of s-SWNTs as-grown is ∼97%, which is still far below the daunting requirements of high-end applications. Herein, we report a feasible and green pathway to use H2O vapor to modulate the structure of the intermetallic W6Co7 nanocrystals. By using the resultant W6Co7 nanocatalysts with a high percentage of (1 0 10) planes as structural templates, we realized the direct growth of s-SWNT with the purity of ∼99%, in which ∼97% is (14,4) tubes (diameter 1.29 nm). H2O can also act as an environmentally friendly and facile etchant for eliminating metallic SWNTs, and the content of s-SWNTs was further improved to 99.8% and (14,4) tubes to 98.6%. High purity s-SWNTs with even bandgap determined by their uniform structure can be used for the exquisite applications in different fields.
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Affiliation(s)
| | | | | | | | - Kuo Qi
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Chuanhong Jin
- School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China
| | | | | | | | | | | | - Zhi Xu
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | | | - Xuedong Bai
- Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
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24
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Yuan Y, Karahan HE, Yıldırım C, Wei L, Birer Ö, Zhai S, Lau R, Chen Y. "Smart poisoning" of Co/SiO 2 catalysts by sulfidation for chirality-selective synthesis of (9,8) single-walled carbon nanotubes. NANOSCALE 2016; 8:17705-17713. [PMID: 27722714 DOI: 10.1039/c6nr05938d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The chirality-selective synthesis of relatively large (diameter > 1 nm) single-walled carbon nanotubes (SWCNTs) is of great interest for a variety of practical applications, but only a few catalysts are available so far. Previous studies suggested that S (compounds) can enhance the chirality-selectivity of Co catalysts in SWCNT synthesis, however, the mechanism behind is not fully understood, and no tailorable methodology has yet been developed. Here, we demonstrate a facile approach to achieve the chirality-selective synthesis of SWCNTs by the sulfidation-based poisoning of silica-supported Co catalysts using a mixture of H2S and H2. The UV-vis-NIR, photoluminescence, and Raman spectroscopy results together show that the resulting SWCNTs have a narrow diameter distribution of around 1.2 nm, and (9,8) nanotubes have an abundance of ∼38% among the semiconducting species. More importantly, the carbon yield achieved by the sulfided catalyst (2.5 wt%) is similar to that of the nonsulfided one (2.7 wt%). The characterization of the catalysts by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray fluorescence, and H2 temperature-programmed reduction shows that the sulfidation leads to the formation of Co9S8 nanoparticles. However, Co9S8 nanoparticles are reduced back to regenerate metallic Co nanoparticles during the synthesis of SWCNTs, which maintain a high carbon yield. In this process, Co9S8 nanoparticles seemingly intermediate the production of Co nanoparticles with narrow size distribution. Due to the fact that the poisoning step improves the quality of the end-product rather than hampering the growth process, we have coined the process developed as "smart poisoning". This study not only reveals the mechanism behind the beneficial role of S in the selective synthesis of relatively large SWCNTs but also presents a promising method to create chirality-selective catalysts with high activity for scalable synthesis.
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Affiliation(s)
- Yang Yuan
- Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637459, Singapore
| | - H Enis Karahan
- Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637459, Singapore and The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia.
| | - Cansu Yıldırım
- Koç University, KUYTAM Surface Science and Technology Center, Rumelifeneri Yolu, Sarıyer, 34450, İstanbul, Turkey
| | - Li Wei
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia.
| | - Özgür Birer
- Koç University, KUYTAM Surface Science and Technology Center, Rumelifeneri Yolu, Sarıyer, 34450, İstanbul, Turkey and Koç University, Chemistry Department, Rumelifeneri Yolu, Sarıyer, 34450, İstanbul, Turkey
| | - Shengli Zhai
- Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637459, Singapore and The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia.
| | - Raymond Lau
- Nanyang Technological University, School of Chemical and Biomedical Engineering, Singapore, 637459, Singapore
| | - Yuan Chen
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia.
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25
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An H, Kumamoto A, Takezaki H, Ohyama S, Qian Y, Inoue T, Ikuhara Y, Chiashi S, Xiang R, Maruyama S. Chirality specific and spatially uniform synthesis of single-walled carbon nanotubes from a sputtered Co-W bimetallic catalyst. NANOSCALE 2016; 8:14523-14529. [PMID: 27412697 DOI: 10.1039/c6nr02749k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Synthesis of single-walled carbon nanotubes (SWNTs) with well-defined atomic arrangements has been widely recognized in the past few decades as the biggest challenge in the SWNT community, and has become a bottleneck for the application of SWNTs in nano-electronics. Here, we report a selective synthesis of (12, 6) SWNTs with an enrichment of 50%-70% by chemical vapor deposition (CVD) using sputtered Co-W as a catalyst. This is achieved under much milder reduction and growth conditions than those in the previous report using transition-metal molecule clusters as catalyst precursors (Nature, 2014, 510, 522). Meanwhile, in-plane transmission electron microscopy unambiguously identified an intermediate structure of Co6W6C, which is strongly associated with selective growth. However, most of the W atoms disappear after a 5 min CVD growth, which implies that anchoring W may be important in this puzzling Co-W system.
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Affiliation(s)
- Hua An
- Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
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26
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Yang F, Wang X, Li M, Liu X, Zhao X, Zhang D, Zhang Y, Yang J, Li Y. Templated Synthesis of Single-Walled Carbon Nanotubes with Specific Structure. Acc Chem Res 2016; 49:606-15. [PMID: 26999451 DOI: 10.1021/acs.accounts.5b00485] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Single-walled carbon nanotubes (SWNTs) have shown great potential in various applications attributed to their unique structure-dependent properties. Therefore, the controlled preparation of chemically and structurally pristine SWNTs is a crucial issue for their advanced applications (e.g., nanoelectronics) and has been a great challenge for two decades. Epitaxial growth from well-defined seeds has been shown to be a promising strategy to control the structure of SWNTs. Segments of carbon nanotubes, including short pipes from cutting of preformed nanotubes and caps from opening of fullerenes or cyclodehydrogenation of polycyclic hydrocarbon precursors, have been used as the seeds to grow SWNTs. Single-chirality SWNTs were obtained with both presorted chirality-pure SWNT segments and end caps obtained from polycyclic hydrocarbon molecules with designed structure. The main challenges of nanocarbon-segment-seeded processes are the stability of the seeds, yield, and efficiency. Catalyst-mediated SWNT growth is believed to be more efficient. The composition and morphology of the catalyst nanoparticles have been widely reported to affect the chirality distribution of SWNTs. However, chirality-specific SWNT growth is hard to achieve by alternating catalysts. The specificity of enzyme-catalyzed reactions brings us an awareness of the essentiality of a unique catalyst structure for the chirality-selective growth of SWNTs. Only catalysts with the desired atomic arrangements in their crystal planes can act as structural templates for chirality-specific growth of SWNTs. We have developed a new family of catalysts, tungsten-based intermetallic compounds, which have high melting points and very special crystal structures, to facilitate the growth of SWNTs with designed chirality. By the use of W6Co7 catalysts, (12,6) SWNTs were directly grown with purity higher than 92%. Both high-resolution transmission electron microscopy measurements and density functional theory simulations show that the selective growth of (12,6) tubes is due to a good structural match between the carbon atom arrangement around the nanotube circumference and the metal atom arrangement of (0 0 12) planes in the catalyst. Similarly, (16,0) SWNTs exhibit a good structural match to the (116) planes of the W6Co7 catalyst. By optimization of the chemical vapor deposition (CVD) conditions, zigzag (16,0) SWNTs, which are generally known as a kinetically unfavorable species in CVD growth, were obtained with a purity of ∼80%. Generally speaking, the chirality-specific growth of SWNTs is realized by the cooperation of two factors: the structural match between SWNTs and the catalysts makes the growth of SWNTs with specific chirality thermodynamically favorable, and further manipulation of the CVD conditions results in optimized growth kinetics for SWNTs with this designed chirality. We expect that this advanced epitaxial growth strategy will pave the way for the ultimate goal of chirality-specified growth of SWNTs and will also be applicable in the controlled preparation of other nanomaterials.
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Affiliation(s)
- Feng Yang
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiao Wang
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Meihui Li
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiyan Liu
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xiulan Zhao
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Daqi Zhang
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yan Zhang
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Juan Yang
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yan Li
- Beijing National Laboratory
for Molecular Science, Key Laboratory for the Physics and Chemistry
of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry
and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| |
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