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Julien BN, Jeon M, Geranfar E, Ghode RGS, Boutilier MSH. Response and resilience of carbon nanotube micropillars to shear flow. NANOTECHNOLOGY 2024; 35:445501. [PMID: 39074484 DOI: 10.1088/1361-6528/ad6873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 07/29/2024] [Indexed: 07/31/2024]
Abstract
Interactions between carbon nanotubes (CNTs) and fluid flows are central to the operation of several emerging nanotechnologies. In this paper, we explore the fluid-structure interaction of CNT micropillars in wall-bounded shear flows, relevant to recently developed microscale wall shear stress sensors. We monitor the deformation of CNT micropillars in channel flow as the flow rate and wall shear stress are gradually varied. We quantify how the micropillars bend at low wall shear stress, and then will commonly tilt abruptly from their base above a threshold wall shear stress, which is attributed to the lower density of the micropillars in this region. Some micropillars are observed to flutter rapidly between a vertical and horizontal position around this threshold wall shear stress, before settling to a tilted position as wall shear stress increases further. Tilted micropillars are found to kink sharply near their base, similar to the observed buckling near the base of CNT micropillars in compression. Upon reducing the flow rate, micropillars are found to fully recover from a near horizontal position to a near vertical position, even with repeated on-off cycling. At sufficiently high wall shear stress, the micropillars were found to detach at the catalyst particle-substrate interface. The mechanical response of CNT micropillars in airflow revealed by this study provides a basis for future development efforts and the accurate simulation of CNT micropillar wall shear stress sensors.
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Affiliation(s)
- Brandon N Julien
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Minae Jeon
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Erfan Geranfar
- Department of Mechanical and Materials Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Rohit G S Ghode
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Michael S H Boutilier
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
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2
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Hamidinejad M, Wang H, Sanders KA, De Volder M. Electrochemically Responsive 3D Nanoarchitectures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2304517. [PMID: 37702306 DOI: 10.1002/adma.202304517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 08/30/2023] [Indexed: 09/14/2023]
Abstract
Responsive nanomaterials are being developed to create new unique functionalities such as switchable colors and adhesive properties or other programmable features in response to external stimuli. While many existing examples rely on changes in temperature, humidity, or pH, this study aims to explore an alternative approach relying on simple electric input signals. More specifically, 3D electrochromic architected microstructures are developed using carbon nanotube-Tin (Sn) composites that can be reconfigured by lithiating Sn with low power electric input (≈50 nanowatts). These microstructures have a continuous, regulated, and non-volatile actuation determined by the extent of the electrochemical lithiation process. In addition, this proposed fabrication process relies only on batch lithographic techniques, enabling the parallel production of thousands of 3D microstructures. Structures with a 30-97% change in open-end area upon actuation are demonstrated and the importance of geometric factors in the response and structural integrity of 3D architected microstructures during electrochemical actuation is highlighted.
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Affiliation(s)
- Mahdi Hamidinejad
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FS, UK
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6G1H9, Canada
| | - Heng Wang
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FS, UK
| | - Kate A Sanders
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FS, UK
| | - Michael De Volder
- Department of Engineering, University of Cambridge, Cambridge, CB3 0FS, UK
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3
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Cao C, Boutilier MSH, Kim S, Taheri-Mousavi SM, Nayakanti N, Roberts R, Owens C, Hart AJ. Low-Profile, Large-Range Compressive Strain Sensing Using Micromanufactured CNT Micropillar Arrays. ACS APPLIED MATERIALS & INTERFACES 2023; 15:38665-38673. [PMID: 37549356 DOI: 10.1021/acsami.3c06299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Tactile sensors, or sensors that collect measurements through touch, have versatile applications in a wide range of fields including robotic gripping, intelligent manufacturing, and biomedical technology. Hoping to match the ability of human hands to sense physical changes in objects through touch, engineers have experimented with a variety of materials from soft polymers to hard ceramics, but so far, all have fallen short. A grand challenge for developers of "human-like" bionic tactile sensors is to be able to sense a wide range of strains while maintaining the low profile necessary for compact integration. Here, we developed a low-profile tactile sensor (∼300 μm in height) based on patterned, vertically aligned carbon nanotubes (PVACNT) that can repetitively sense compressive strains of up to 75%. Upon compression, reversible changes occur in the points of contact between CNTs, producing measurable changes in electrical admittance. By patterning VACNT pillars with different aspect ratios and pitch sizes, we engineered the range and resolution of strain sensing, suggesting that CNT-based tactile sensors can be integrated according to device specifications.
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Affiliation(s)
- Changhong Cao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada
| | - Michael S H Boutilier
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada
| | - Sanha Kim
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - S Mohadeseh Taheri-Mousavi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Nigamaa Nayakanti
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Ricardo Roberts
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- School of Engineering and Sciences, Tecnológico de Monterrey, 64849 Monterrey, NL, Mexico
| | - Crystal Owens
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - A John Hart
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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4
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Multimodal collective swimming of magnetically articulated modular nanocomposite robots. Nat Commun 2022; 13:6750. [PMID: 36347849 PMCID: PMC9643480 DOI: 10.1038/s41467-022-34430-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 10/26/2022] [Indexed: 11/11/2022] Open
Abstract
Magnetically responsive composites can impart maneuverability to miniaturized robots. However, collective actuation of these composite robots has rarely been achieved, although conducting cooperative tasks is a promising strategy for accomplishing difficult missions with a single robot. Here, we report multimodal collective swimming of ternary-nanocomposite-based magnetic robots capable of on-demand switching between rectilinear translational swimming and rotational swimming. The nanocomposite robots comprise a stiff yet lightweight carbon nanotube yarn (CNTY) framework surrounded by a magnetic polymer composite, which mimics the hierarchical architecture of musculoskeletal systems, yielding magnetically articulated multiple robots with an agile above-water swimmability (~180 body lengths per second) and modularity. The multiple robots with multimodal swimming facilitate the generation and regulation of vortices, enabling novel vortex-induced transportation of thousands of floating microparticles and heavy semi-submerged cargos. The controllable collective actuation of these biomimetic nanocomposite robots can lead to versatile robotic functions, including microplastic removal, microfluidic vortex control, and transportation of pharmaceuticals.
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5
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Morco SR, Jensen BD, Bowden AE. Curvature-induced defects on carbon-infiltrated carbon nanotube forests. RSC Adv 2022; 12:2115-2122. [PMID: 35425237 PMCID: PMC8979125 DOI: 10.1039/d1ra07243a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 01/05/2022] [Indexed: 12/21/2022] Open
Abstract
A morphological study of the micro-scale defects induced by growing a carbon-infiltrated carbon nanotube (CICNT) forest on concave substrates was conducted. Two CICNT heights (roughly 60 μm and 400 μm) and 4 curvatures (1–4 mm ID) were studied in order to test the geometric limitations. Defects were categorized and quantified by scanning electron microscopy (SEM) of the tops and cross-sections. These deformities were categorized as increased roughness on the top surface, a corrugated (also called wavy or rippled) forest, a curved forest, an inside crevice where the forest separates, and increased forest density on the top surface. Roughness increased nearly 3-fold with the taller forest heights no matter the substrate curvature. Due to the geometric limitations of CICNT height and substrate curvature, all other microscale defects were significantly more present on samples with a small radius of curvature and a tall CICNT forest (p < 0.05). These buckling and warping types of defects were attributed to the increase in circumferential compression as the forest grows as well as the van der Waals interactions between the nanotubes. Because the fabrication process for CICNT involves growing a CNT forest and then infiltrating it with pyrolytic carbon, this work may be applicable to other CNT forests on concave substrates within these forest heights and substrate curvatures. A morphological study of the micro-scale defects induced by growing a carbon-infiltrated carbon nanotube (CICNT) forest on concave substrates was conducted.![]()
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Affiliation(s)
- Stephanie R Morco
- Brigham Young University, Department of Mechanical Engineering 350 Engineering Building Provo UT 84602 USA
| | - Brian D Jensen
- Brigham Young University, Department of Mechanical Engineering 350 Engineering Building Provo UT 84602 USA
| | - Anton E Bowden
- Brigham Young University, Department of Mechanical Engineering 350 Engineering Building Provo UT 84602 USA
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6
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Xue F, Zheng H, Peng Q, Hu Y, Zhao X, Xu L, Li P, Zhu Y, Liu Z, He X. An ultra-broad-range pressure sensor based on a gradient stiffness design. MATERIALS HORIZONS 2021; 8:2260-2272. [PMID: 34846430 DOI: 10.1039/d1mh00384d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The question of how to make artificial intelligence robots perceive the power of "light as a feather" and "heavy as a mountain" at the same time has always been a goal that people are striving to achieve. However, pressure sensors, the key components of electronic equipment, are often unable to incorporate high sensitivity and wide range performance. Here, we proposed a "gradient stiffness design" strategy to prepare a kind of carbon nanotube sponge with a stiffness difference of up to 254 times between different layers, but still maintaining an integral conductive network without delamination. This gradient stiffness structure sponge shows prominent sensing properties with ultra-broad range (from 0.0022 MPa to 5.47 MPa) and high sensitivity. The low stiffness layer can detect low stress (0.0022 MPa) with high sensitivity of 0.765 MPa-1, and the high stiffness layer can greatly extend the sensing range to an unprecedentedly high value (5.47 MPa). It can concisely detect various motions with different stress, from slight clamping of fragile fries by the robot fingers to heavily stomping motions by a 90 kg person. Moreover, a series of human movements from small-scale to large-scale can be also monitored, revealing the great potential of this gradient stiffness structure in future sensing research.
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Affiliation(s)
- Fuhua Xue
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, P. R. China.
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7
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Park JE, Won S, Cho W, Kim JG, Jhang S, Lee JG, Wie JJ. Fabrication and applications of stimuli‐responsive micro/nanopillar arrays. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210311] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jeong Eun Park
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Sukyoung Won
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Woongbi Cho
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Jae Gwang Kim
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Saebohm Jhang
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Jae Gyeong Lee
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
| | - Jeong Jae Wie
- Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea
- Program in Environmental and Polymer Engineering Inha University Incheon 22212 Republic of Korea
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8
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Dasbach M, Pyschik M, Lehmann V, Parey K, Rhinow D, Reinhardt HM, Hampp NA. Assembling Carbon Nanotube Architectures. ACS NANO 2020; 14:8181-8190. [PMID: 32551529 DOI: 10.1021/acsnano.0c01606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Well-defined multiwalled carbon nanotube structures are generated on stainless steel AISI 304 (EN AW 1.4301) by chemical vapor deposition. Pulsed laser-induced dewetting (PLiD) of the surface, by 532 nm nanosecond laser pulses, is utilized for the preparation of metal oxide nanoparticle fields with a defined particle number per area. The reduction of the precursor particles is achieved in an Ar/H2 (10% H2) atmosphere at 750 °C, thereby generating catalytic nanoparticles (c-NPs) for carbon nanotube (CNT) growth. Ethylene is used as a precursor gas for CNT growth. CNT lengths and morphology are directly related to the c-NP aerial density, which is dependent on the number of dewetting cycles during the PLiD process. Within a narrow window of c-NP per area, vertically aligned carbon nanotubes of great lengths are obtained. For more intense laser treatments, three-dimensional dewetting occurs and results in the formation of cauliflower-like structures. The laser process enables the creation of all kinds of CNT morphologies nearby on the microscale.
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Affiliation(s)
- Michael Dasbach
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
| | - Markus Pyschik
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
| | - Viktor Lehmann
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
| | - Kristian Parey
- Max-Planck Institute for Biophysics, Max-von-Laue Strasse 3, 60438 Frankfurt, Germany
| | - Daniel Rhinow
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
- Max-Planck Institute for Biophysics, Max-von-Laue Strasse 3, 60438 Frankfurt, Germany
| | - Hendrik M Reinhardt
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
| | - Norbert A Hampp
- Department of Chemistry, Philipps-University of Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany
- Material Science Center, 35032 Marburg, Germany
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9
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Hines R, Hajilounezhad T, Love-Baker C, Koerner G, Maschmann MR. Growth and Mechanics of Heterogeneous, 3D Carbon Nanotube Forest Microstructures Formed by Sequential Selective-Area Synthesis. ACS APPLIED MATERIALS & INTERFACES 2020; 12:17893-17900. [PMID: 32208632 DOI: 10.1021/acsami.0c03082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three-dimensional carbon nanotube (CNT) forest microstructures are synthesized using sequenced, site-specific synthesis techniques. Thin-film layers of Al2O3 and Al2O3/Fe are patterned to support film-catalyst and floating-catalyst chemical vapor deposition (CVD) in specific areas. Al2O3 regions support only floating-catalyst CVD, whereas regions of layered Al2O3/Fe support both film- and floating-catalyst CNT growth. Sequenced application of the two CVD methods produced heterogeneous 3D CNT forest microstructures, including regions of only film-catalyst CNTs, only floating-catalyst CNTs, and vertically stacked layers of each. The compressive mechanical behavior of the heterogeneous CNT forests was evaluated, with the stacked layers exhibiting two distinct buckling plateaus. Finite element simulation of the stacked layers demonstrated that the relatively soft film-catalyst CNT forests were nearly fully buckled prior to large-scale deformation of the bottom floating-catalyst CNT forests.
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Affiliation(s)
- Ryan Hines
- Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, United States
| | - Taher Hajilounezhad
- Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, United States
| | - Cole Love-Baker
- Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Gordon Koerner
- Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, United States
| | - Matthew R Maschmann
- Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, United States
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10
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Jessl S, Rongé J, Copic D, Jones MA, Martens J, De Volder M. Honeycomb-shaped carbon nanotube supports for BiVO 4 based solar water splitting. NANOSCALE 2019; 11:22964-22970. [PMID: 31764928 DOI: 10.1039/c9nr06737j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Advances in the synthesis and assembly of nanomaterials offer a unique opportunity to purposefully design structures according to the requirements of the targeted applications. This paper shows a process to create robust 3D carbon nanotube (CNT) structures, which provide an electrically conductive support for nanoparticle coating. We describe a process to reliably fabricate robust honeycomb structures with walls made out of aligned CNTs. We present a design of experimental analysis of this fabrication process and discuss methods to coat these honeycombs with BiVO4 for solar fuel applications. The proposed honeycomb structure allows for an efficient transport of electrons through the electrode, as well as an enhanced light-electrode interaction. Finally, we demonstrate that the developed CNT electrodes can survive harsh BiVO4 synthesis conditions and can subsequently be used as photoelectrodes for solar water splitting.
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Affiliation(s)
- Sarah Jessl
- University of Cambridge, Department of Engineering, Cambridge CB2 1PZ, UK.
| | - Jan Rongé
- KU Leuven, Leuven, Centre for Surface Chemistry and Catalysis, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Davor Copic
- University of Cambridge, Department of Engineering, Cambridge CB2 1PZ, UK.
| | - Michael A Jones
- University of Cambridge, Department of Chemistry, Cambridge CB2 1EW, UK
| | - Johan Martens
- KU Leuven, Leuven, Centre for Surface Chemistry and Catalysis, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Michael De Volder
- University of Cambridge, Department of Engineering, Cambridge CB2 1PZ, UK.
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11
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Kim S, Jiang Y, Thompson Towell KL, Boutilier MSH, Nayakanti N, Cao C, Chen C, Jacob C, Zhao H, Turner KT, Hart AJ. Soft nanocomposite electroadhesives for digital micro- and nanotransfer printing. SCIENCE ADVANCES 2019; 5:eaax4790. [PMID: 31646176 PMCID: PMC6788868 DOI: 10.1126/sciadv.aax4790] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 09/14/2019] [Indexed: 06/10/2023]
Abstract
Automated handling of microscale objects is essential for manufacturing of next-generation electronic systems. Yet, mechanical pick-and-place technologies cannot manipulate smaller objects whose surface forces dominate over gravity, and emerging microtransfer printing methods require multidirectional motion, heating, and/or chemical bonding to switch adhesion. We introduce soft nanocomposite electroadhesives (SNEs), comprising sparse forests of dielectric-coated carbon nanotubes (CNTs), which have electrostatically switchable dry adhesion. SNEs exhibit 40-fold lower nominal dry adhesion than typical solids, yet their adhesion is increased >100-fold by applying 30 V to the CNTs. We characterize the scaling of adhesion with surface morphology, dielectric thickness, and applied voltage and demonstrate digital transfer printing of films of Ag nanowires, polymer and metal microparticles, and unpackaged light-emitting diodes.
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Affiliation(s)
- Sanha Kim
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
| | - Yijie Jiang
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA
| | - Kiera L. Thompson Towell
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael S. H. Boutilier
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Nigamaa Nayakanti
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Changhong Cao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Chunxu Chen
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA
| | - Christine Jacob
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Hangbo Zhao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Kevin T. Turner
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, USA
| | - A. John Hart
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
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12
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Jang LW, Shim J, Son DI, Cho H, Zhang L, Zhang J, Menghini M, Locquet JP, Seo JW. Simultaneous growth of three-dimensional carbon nanotubes and ultrathin graphite networks on copper. Sci Rep 2019; 9:12344. [PMID: 31462677 PMCID: PMC6713782 DOI: 10.1038/s41598-019-48725-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 08/07/2019] [Indexed: 11/24/2022] Open
Abstract
A new way to simultaneously grow carbon nanotubes (CNTs) and ultrathin graphite on copper (Cu) foils has been investigated. This one-step growth process yields three-dimensional networks of CNTs on graphitic layers (3D CNTs/G) on Cu foils. Their synthesis conditions and growth mechanism are discussed in detail taking their structural properties into account. Individual CNTs and the 3D CNTs/G networks by means of an in-situ conductive atomic force microscope inside a scanning electron microscope are electrically characterized. Time-resolved photoluminescence demonstrated fast charge transfer and high carrier collection efficiency superior to two-dimensional ultrathin graphite only. Their facile and tunable growth and excellent electrical properties show that the 3D CNTs/G are strongly attractive for various applications such as solar cells, sensors, supercapacitors, photovoltaics, power generation, and optoelectronics.
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Affiliation(s)
- Lee-Woon Jang
- KU Leuven, Department of Materials Engineering, Leuven, B-3001, Belgium
| | - Jaeho Shim
- Korea Institute of Science and Technology, Institute of Advanced Composite Materials, Jeonbuk, 55324, Republic of Korea
| | - Dong Ick Son
- Korea Institute of Science and Technology, Institute of Advanced Composite Materials, Jeonbuk, 55324, Republic of Korea
| | - Hyunjin Cho
- Chonbuk National University, Department of Organic Materials and Fiber Engineering, Jeonju, 54896, Republic of Korea
| | - Luman Zhang
- KU Leuven, Department of Materials Engineering, Leuven, B-3001, Belgium
| | - Jie Zhang
- KU Leuven, Department of Materials Engineering, Leuven, B-3001, Belgium
| | - Mariela Menghini
- KU Leuven, Department of Physics and Astronomy, Leuven, B-3001, Belgium
| | | | - Jin Won Seo
- KU Leuven, Department of Materials Engineering, Leuven, B-3001, Belgium.
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13
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Zhao H, Park SJ, Solomon BR, Kim S, Soto D, Paxson AT, Varanasi KK, Hart AJ. Synthetic Butterfly Scale Surfaces with Compliance-Tailored Anisotropic Drop Adhesion. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807686. [PMID: 30761627 DOI: 10.1002/adma.201807686] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/25/2019] [Indexed: 06/09/2023]
Abstract
Many natural surfaces such as butterfly wings, beetles' backs, and rice leaves exhibit anisotropic liquid adhesion; this is of fundamental interest and is important to applications including self-cleaning surfaces, microfluidics, and phase change energy conversion. Researchers have sought to mimic the anisotropic adhesion of butterfly wings using rigid surface textures, though natural butterfly scales are sufficiently compliant to be deflected by capillary forces exerted by drops. Here, inspired by the flexible scales of the Morpho aega butterfly wing, synthetic surfaces coated with flexible carbon nanotube (CNT) microscales with anisotropic drop adhesion properties are fabricated. The curved CNT scales are fabricated by a strain-engineered chemical vapor deposition technique, giving ≈5000 scales of ≈10 µm thickness in a 1 cm2 area. Using various designed CNT scale arrays, it is demonstrated that the anisotropy of drop roll-off angle is influenced by the geometry, compliance, and hydrophobicity of the scales; and a maximum roll-off anisotropy of 6.2° is achieved. These findings are supported by a model that relates the adhesion anisotropy to the scale geometry, compliance, and wettability. The electrical conductivity and mechanical robustness of the CNTs, and the ability to fabricate complex multidirectional patterns, suggest further opportunities to create engineered synthetic scale surfaces.
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Affiliation(s)
- Hangbo Zhao
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Sei Jin Park
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94550, USA
| | - Brian R Solomon
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Sanha Kim
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Dan Soto
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Adam T Paxson
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Kripa K Varanasi
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - A John Hart
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
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14
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Xiang M, Song M, Zhu Q, Yang Y, Li S, Hu C, Lv P, Pan F, Ge Y. Synthesis of high melting point TiN mesocrystal powders by a metastable state strategy. CrystEngComm 2019. [DOI: 10.1039/c8ce02156b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of high melting point non-oxide ceramic powders with mesocrystal structure is an important and challenging task.
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Affiliation(s)
- Maoqiao Xiang
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Miao Song
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Qingshan Zhu
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Yafeng Yang
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Shaofu Li
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Chaoquan Hu
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Pengpeng Lv
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Feng Pan
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Yu Ge
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
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15
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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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16
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Schneider JJ. Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing. ACTA ACUST UNITED AC 2017; 1:e1700101. [PMID: 32646166 DOI: 10.1002/adbi.201700101] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 07/04/2017] [Indexed: 12/30/2022]
Abstract
Vertically aligned carbon nanotubes (VACNTs) are one dimensional carbon objects anchored atop of a solid substrate. They are geometrically fixed in contrast to their counterparts, randomly oriented carbon nanotubes (CNTs). In this progress report, the breadth in which these one dimensional, mechanically flexible, though robust and electrical conducting carbon nanostructures can be employed as functional material is shown and our research is put in perspective to work in the last five to ten years. The connection between the different areas touched in this report is the biomimetic-materials approach, which rely on the hairy morphology of VACNTs. These properties in connection with their electrical conductivity offer possibilities towards new functional features and applications of VACNTs. To appreciate the possibilities of biomimetic research with VACNTs, first their material characteristics are given to make the reader familiar with specific features of their synthesis, the peculiarities in arranging and controlling the morphology of CNTs in a vertical alignment as well as a current understanding of these properties on a microscopic basis. In doing so, similarities as well as differences, which offer new possibilities for biomimetic studies of VACNTS with respect to multiwalled randomly oriented CNTs, will become clear.
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Affiliation(s)
- Jörg J Schneider
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss Str. 12, 64287, Darmstadt, Germany
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17
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Meshot ER, Zwissler DW, Bui N, Kuykendall TR, Wang C, Hexemer A, Wu KJJ, Fornasiero F. Quantifying the Hierarchical Order in Self-Aligned Carbon Nanotubes from Atomic to Micrometer Scale. ACS NANO 2017; 11:5405-5416. [PMID: 28414424 DOI: 10.1021/acsnano.6b08042] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Fundamental understanding of structure-property relationships in hierarchically organized nanostructures is crucial for the development of new functionality, yet quantifying structure across multiple length scales is challenging. In this work, we used nondestructive X-ray scattering to quantitatively map the multiscale structure of hierarchically self-organized carbon nanotube (CNT) "forests" across 4 orders of magnitude in length scale, from 2.0 Å to 1.5 μm. Fully resolved structural features include the graphitic honeycomb lattice and interlayer walls (atomic), CNT diameter (nano), as well as the greater CNT ensemble (meso) and large corrugations (micro). Correlating orientational order across hierarchical levels revealed a cascading decrease as we probed finer structural feature sizes with enhanced sensitivity to small-scale disorder. Furthermore, we established qualitative relationships for single-, few-, and multiwall CNT forest characteristics, showing that multiscale orientational order is directly correlated with number density spanning 109-1012 cm-2, yet order is inversely proportional to CNT diameter, number of walls, and atomic defects. Lastly, we captured and quantified ultralow-q meridional scattering features and built a phenomenological model of the large-scale CNT forest morphology, which predicted and confirmed that these features arise due to microscale corrugations along the vertical forest direction. Providing detailed structural information at multiple length scales is important for design and synthesis of CNT materials as well as other hierarchically organized nanostructures.
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Affiliation(s)
- Eric R Meshot
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | - Darwin W Zwissler
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | - Ngoc Bui
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | | | | | | | - Kuang Jen J Wu
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
| | - Francesco Fornasiero
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , 7000 East Avenue, Livermore, California 94550, United States
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18
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Zhu J, Jiang X, Zhong J, Duan Y. Polymer brushes and their possible applications in artificial cilia research. Mol Med Rep 2017; 15:3936-3942. [DOI: 10.3892/mmr.2017.6533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 02/20/2017] [Indexed: 11/06/2022] Open
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19
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Zhao H, Jacob C, Stone HA, Hart AJ. Liquid Imbibition in Ceramic-Coated Carbon Nanotube Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12686-12692. [PMID: 27934531 DOI: 10.1021/acs.langmuir.6b03661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Understanding of the liquid imbibition dynamics in nanoporous materials is important to advances in chemical separations, phase change heat transfer, electrochemical energy storage, and diagnostic assays. We study the liquid imbibition behavior in films of ceramic-coated vertically aligned carbon nanotubes (CNTs). The nanoscale porosity of the films is tuned by conformal ceramic coating via atomic layer deposition (ALD), enabling stable liquid imbibition and precise measurement of the imbibition dynamics without capillary densification of the CNTs. We show that the imbibition rate decreases as the ceramic coating thickness increases, which effectively changes the CNT-CNT spacing and therefore decreases the permeability. We derive a model, based on Darcy's law, that incorporates an expression for the permeability of nanoscale post arrays, and we show that the model fits the experimental results with high accuracy. The tailorable porosity, along with controllable surface wettability and mechanical stability of coated CNTs, suggest their suitability for application-guided engineering, and for further investigation of imbibition behavior at finer length scales.
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Affiliation(s)
- Hangbo Zhao
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Christine Jacob
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Howard A Stone
- Department of Mechanical and Aerospace Engineering, Princeton University , Princeton, New Jersey 08544, United States
| | - A John Hart
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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20
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Yilmazoglu O, Yadav S, Cicek D, Schneider JJ. A nano-microstructured artificial-hair-cell-type sensor based on topologically graded 3D carbon nanotube bundles. NANOTECHNOLOGY 2016; 27:365502. [PMID: 27481641 DOI: 10.1088/0957-4484/27/36/365502] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A design for a unique artificial-hair-cell-type sensor (AHCTS) based entirely on 3D-structured, vertically aligned carbon nanotube (CNT) bundles is introduced. Standard microfabrication techniques were used for the straightforward micro-nano integration of vertically aligned carbon nanotube arrays composed of low-layer multi-walled CNTs (two to six layers). The mechanical properties of the carbon nanotube bundles were intensively characterized with regard to various substrates and CNT morphology, e.g. bundle height. The CNT bundles display excellent flexibility and mechanical stability for lateral bending, showing high tear resistance. The integrated 3D CNT sensor can detect three-dimensional forces using the deflection or compression of a central CNT bundle which changes the contact resistance to the shorter neighboring bundles. The complete sensor system can be fabricated using a single chemical vapor deposition (CVD) process step. Moreover, sophisticated external contacts to the surroundings are not necessary for signal detection. No additional sensors or external bias for signal detection are required. This simplifies the miniaturization and the integration of these nanostructures for future microsystem set-ups. The new nanostructured sensor system exhibits an average sensitivity of 2100 ppm in the linear regime with the relative resistance change per micron (ppm μm(-1)) of the individual CNT bundle tip deflection. Furthermore, experiments have shown highly sensitive piezoresistive behavior with an electrical resistance decrease of up to ∼11% at 50 μm mechanical deflection. The detection sensitivity is as low as 1 μm of deflection, and thus highly comparable with the tactile hair sensors of insects, having typical thresholds on the order of 30-50 μm. The AHCTS can easily be adapted and applied as a flow, tactile or acceleration sensor as well as a vibration sensor. Potential applications of the latter might come up in artificial cochlear systems. In particular, the stable mechanical bending of the sensor up to 90° opens up unique application opportunities.
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Affiliation(s)
- O Yilmazoglu
- Department of High Frequency Electronics, Technische Universität Darmstadt, 64283 Darmstadt, Germany
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21
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Park SJ, Zhao H, Kim S, De Volder M, John Hart A. Predictive Synthesis of Freeform Carbon Nanotube Microarchitectures by Strain-Engineered Chemical Vapor Deposition. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:4393-4403. [PMID: 27378165 DOI: 10.1002/smll.201601093] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 04/27/2016] [Indexed: 06/06/2023]
Abstract
High-throughput fabrication of microstructured surfaces with multi-directional, re-entrant, or otherwise curved features is becoming increasingly important for applications such as phase change heat transfer, adhesive gripping, and control of electromagnetic waves. Toward this goal, curved microstructures of aligned carbon nanotubes (CNTs) can be fabricated by engineered variation of the CNT growth rate within each microstructure, for example by patterning of the CNT growth catalyst partially upon a layer which retards the CNT growth rate. This study develops a finite-element simulation framework for predictive synthesis of complex CNT microarchitectures by this strain-engineered growth process. The simulation is informed by parametric measurements of the CNT growth kinetics, and the anisotropic mechanical properties of the CNTs, and predicts the shape of CNT microstructures with impressive fidelity. Moreover, the simulation calculates the internal stress distribution that results from extreme deformation of the CNT structures during growth, and shows that delamination of the interface between the differentially growing segments occurs at a critical shear stress. Guided by these insights, experiments are performed to study the time- and geometry-depended stress development, and it is demonstrated that corrugating the interface between the segments of each microstructure mitigates the interface failure. This study presents a methodology for 3D microstructure design based on "pixels" that prescribe directionality to the resulting microstructure, and show that this framework enables the predictive synthesis of more complex architectures including twisted and truss-like forms.
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Affiliation(s)
- Sei Jin Park
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Hangbo Zhao
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Sanha Kim
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Michael De Volder
- Institute for Manufacturing, Department of Engineering, University of Cambridge, 17 Charles Babbage Road, Cambridge, CB3 0FS, UK
| | - A John Hart
- Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
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22
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Guo J, Kum CW, Au KH, Tan ZE, Wu H, Liu K. New vibration-assisted magnetic abrasive polishing (VAMAP) method for microstructured surface finishing. OPTICS EXPRESS 2016; 24:13542-13554. [PMID: 27410370 DOI: 10.1364/oe.24.013542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In order to polish microstructured surface without deteriorating its profile, we propose a new vibration-assisted magnetic abrasive polishing (VAMAP) method. In this method, magnetic force guarantees that the magnetic abrasives can well contact the microstructured surface and access the corners of microstructures while vibration produces a relative movement between microstructures and magnetic abrasives. As the vibration direction is parallel to the microstructures, the profile of the microstructures will not be deteriorated. The relation between vibration and magnetic force was analyzed and the feasibility of this method was experimentally verified. The results show that after polishing, the surface finish around microstructures was significantly improved while the profile of microstructures was well maintained.
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23
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Silvestri C, Riccio M, Poelma RH, Morana B, Vollebregt S, Santagata F, Irace A, Zhang GQ, Sarro PM. Thermal characterization of carbon nanotube foam using MEMS microhotplates and thermographic analysis. NANOSCALE 2016; 8:8266-8275. [PMID: 27031225 DOI: 10.1039/c6nr00745g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Thermal material properties play a fundamental role in the thermal management of microelectronic systems. The porous nature of carbon nanotube (CNT) arrays results in a very high surface area to volume ratio, which makes the material attractive for surface driven heat transfer mechanisms. Here, we report on the heat transfer performance of lithographically defined micropins made of carbon nanotube (CNT) nanofoam, directly grown on microhotplates (MHPs). The MHP is used as an in situ characterization platform with controllable hot-spot and integrated temperature sensor. Under natural convection, and equivalent power supplied, we measured a significant reduction in hot-spot temperature when augmenting the MHP surface with CNT micropins. In particular, a strong enhancement of convective and radiative heat transfer towards the surrounding environment is recorded, due to the high aspect ratio and the foam-like morphology of the patterned CNTs. By combining electrical characterizations with high-resolution thermographic microscopy analysis, we quantified the heat losses induced by the integrated CNT nanofoams and we found a unique temperature dependency of the equivalent convective heat transfer coefficient, Hc. The obtained results with the proposed non-destructive characterization method demonstrate that significant improvements can be achieved in microelectronic thermal management and hierarchical structured porous material characterization.
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Affiliation(s)
- Cinzia Silvestri
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Michele Riccio
- Department of Electrical Engineering and Information Technologies, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
| | - René H Poelma
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Bruno Morana
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Sten Vollebregt
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Fabio Santagata
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Andrea Irace
- Department of Electrical Engineering and Information Technologies, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy
| | - Guo Qi Zhang
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
| | - Pasqualina M Sarro
- Department of Microelectronics, Delft University of Technology, Feldmannweg 17, 2628CT Delft, The Netherlands.
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