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Li Z, Li ZH, Zhang Y, Xu X, Cheng Y, Zhang Y, Zhao J, Wei N. Highly Sensitive Weaving Sensor of Hybrid Graphene Nanoribbons and Carbon Nanotubes for Enhanced Pressure Sensing Function. ACS Sens 2024; 9:2499-2508. [PMID: 38683974 DOI: 10.1021/acssensors.4c00170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
Carbon nanotubes (CNTs) hold great promise in next-generation sensors because of their remarkable physical properties. Yet, maintaining precise stacking configurations of CNTs to make full use of their remarkable properties is challenging because of their susceptibility to spontaneous reconstruction. Inspired by the weaving technology, we propose a CNT-graphene nanoribbon hybrid woven model that can maintain the specific structure of CNTs to achieve their elaborately designed function. In this study, comprehensive molecular dynamics simulations are carried out to investigate the thermal stability of the CNT-graphene hybrid woven model, as well as their potential for pressure sensing applications by utilizing the unique response of thermal transport to mechanical deformation at heterojunctions. The thermal stability is sensitive to the size of the graphene nanoribbon, and the woven structure remains stable from 200-500 K when its width is greater than 2.0 nm. Moreover, it is exciting that the sensors are effective at predicting the shapes of externally loaded objects through the analysis of the thermal conductivity distribution, which can be derived from the relationship between the thermal conduction and the pressure. Our findings shed light on the bottom-up functional design of nanomaterials and expand wider applications of high-performance nanosensors in other related fields.
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Affiliation(s)
- Zhen Li
- Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology; Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China
| | - Zhi-Hui Li
- China Aerodynamics Research and Development Center, Mianyang 621000, China
- National Laboratory for Computational Fluid Dynamics, Beijing 100191, China
| | - Yue Zhang
- Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology; Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China
| | - Xujun Xu
- Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology; Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China
| | - Yanhua Cheng
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Yingyan Zhang
- School of Engineering, RMIT University, PO Box 71, Bundoora, Victoria 3083, Australia
| | - Junhua Zhao
- Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology; Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China
| | - Ning Wei
- Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology; Jiangsu Province Engineering Research Center of Micro-Nano Additive and Subtractive Manufacturing, Institute of Advanced Technology, Jiangnan University, Wuxi 214122, China
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2
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Panneerselvam V, Sathian SP. Thermal transport in a defective pillared graphene network: insights from equilibrium molecular dynamics simulation. Phys Chem Chem Phys 2024; 26:10650-10659. [PMID: 38511499 DOI: 10.1039/d4cp00147h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
Graphene-based hybrid nanostructures have great potential to be ideal candidates for developing tailored thermal transport materials. In this study, we perform equilibrium molecular dynamics simulations employing the Green-Kubo method to investigate the influence of topological defects in three-dimensional pillared graphene networks. Similar to single-layer graphene and carbon nanotubes, the thermal conductivity (k) of pillared graphene systems exhibits a strong correlation with the system size (L), following a power-law relation k ∼ Lα, where α ranges from 0.12 to 0.15. Our results indicate that the vacancy defects significantly reduce thermal conductivity in pillared graphene systems compared to Stone-Wales defects. We observe that, beyond defect concentration, the location of the defects also plays a crucial role in determining thermal conductivity. We further analyze the phonon vibrational spectrum and the phonon participation ratio to obtain more insight into the thermal transport in the defective pillared graphene network. In most scenarios, longitudinal and flexural acoustic phonons experience significant localization within the 15-45 THz frequency range in the defective pillared graphene system.
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Affiliation(s)
- Vivekkumar Panneerselvam
- Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology, Chennai, India.
| | - Sarith P Sathian
- Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology, Chennai, India.
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3
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Brakat A, Zhu H. From Forces to Assemblies: van der Waals Forces-Driven Assemblies in Anisotropic Quasi-2D Graphene and Quasi-1D Nanocellulose Heterointerfaces towards Quasi-3D Nanoarchitecture. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2399. [PMID: 37686907 PMCID: PMC10489977 DOI: 10.3390/nano13172399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/14/2023] [Accepted: 08/19/2023] [Indexed: 09/10/2023]
Abstract
In the pursuit of advanced functional materials, the role of low-dimensional van der Waals (vdW) heterointerfaces has recently ignited noteworthy scientific interest, particularly in assemblies that incorporate quasi-2D graphene and quasi-1D nanocellulose derivatives. The growing interest predominantly stems from the potential to fabricate distinct genres of quasi-2D/1D nanoarchitecture governed by vdW forces. Despite the possibilities, the inherent properties of these nanoscale entities are limited by in-plane covalent bonding and the existence of dangling π-bonds, constraints that inhibit emergent behavior at heterointerfaces. An innovative response to these limitations proposes a mechanism that binds multilayered quasi-2D nanosheets with quasi-1D nanochains, capitalizing on out-of-plane non-covalent interactions. The approach facilitates the generation of dangling bond-free iso-surfaces and promotes the functionalization of multilayered materials with exceptional properties. However, a gap still persists in understanding transition and alignment mechanisms in disordered multilayered structures, despite the extensive exploration of monolayer and asymmetric bilayer arrangements. In this perspective, we comprehensively review the sophisticated aspects of multidimensional vdW heterointerfaces composed of quasi-2D/1D graphene and nanocellulose derivatives. Further, we discuss the profound impacts of anisotropy nature and geometric configurations, including in-plane and out-of-plane dynamics on multiscale vdW heterointerfaces. Ultimately, we shed light on the emerging prospects and challenges linked to constructing advanced functional materials in the burgeoning domain of quasi-3D nanoarchitecture.
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Affiliation(s)
| | - Hongwei Zhu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Panneerselvam V, Anandakrishnan A, Sathian SP. Modeling the effect of chirality on thermal transport in a pillared-graphene structure. Phys Chem Chem Phys 2023; 25:6184-6193. [PMID: 36752543 DOI: 10.1039/d2cp03792k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The anisotropic heat transport in graphene-CNT based materials provoked the development of three-dimensional pillared-graphene (PG) systems. In this study, we performed non-equilibrium molecular dynamics simulations to analyze PG thermal conductivity and thermal boundary conductance. For the first time, we have considered the influence of pillar chirality and the temperature effect on PG heat transport. We analyzed the influence of pillar chirality and pillar length on the in- and out-of-plane transport properties. For the temperature-dependent analysis, the chosen temperatures were in the range of 100 K to 500 K. To elucidate the mechanism underlying the heat transport, we investigated the phonon density of states (DOS) in the different regions of PG systems. The overlap factor was calculated to quantify the mismatch in the phonon DOS profiles. Across the pillar region, the overlap factor correlates directly with the thermal boundary conductance. When heat is transported in an out-of-plane direction, the zig-zag PG system performs better than the armchair PG system. The atomic arrangement at the graphene-CNT interface plays an inevitable role in limiting heat transport in PG systems. The calculated phonon energy in the zig-zag PG interface is higher than that in the armchair PG interface.
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Affiliation(s)
| | | | - Sarith P Sathian
- Department of Applied Mechanics, Indian Institute of Technology, Chennai, India.
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5
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Yang Y, Shen H, Yang J, Gao K, Wang Z, Sun L. Synergistic effect of reduced graphene oxide/carbon nanotube hybrid papers on cross-plane thermal and mechanical properties. RSC Adv 2022; 12:19144-19153. [PMID: 35865578 PMCID: PMC9246462 DOI: 10.1039/d2ra01723g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/26/2022] [Indexed: 11/21/2022] Open
Abstract
Graphene paper has attracted great attention as a heat dissipation material due to its excellent thermal conductivity and mechanical properties. However, the thermal conductivity of graphene paper in the normal direction is relatively poor. In this work, the cross-plane thermal conductivities (K⊥) and mechanical properties of the reduced graphene oxide/carbon nanotube papers with different CNT loadings were studied systematically. It was found that the K⊥ decreased from 0.0393 W m−1 K−1 for 0 wt% paper to 0.0250 W m−1 K−1 for 3 wt% paper, and then increased to 0.1199 W m−1 K−1 for 20 wt% paper. The papers demonstrated a maximum elastic modulus of 6.1 GPa with 10 wt% CNT loading. The CNTs acted as scaffolds to restrain the graphene sheets from corrugating and to reinforce the mechanical properties of the hybrid papers. The more CNTs that filled the gaps between graphene sheets, the greater the number of channels of the transmission of phonons and the looser the structure in the cross-plane direction. Further mechanism analysis revealed the synergistic effects of CNT loadings and graphene sheets on enhancing the thermal and mechanical performance of the papers. The top-view SEM images for (a) rGO, (b) rGO/CNT-3%, (c) rGO/CNTs-20% and the corresponding schematic diagram of photon transmission with different spacer CNTs loadings (a-i, b-ii, c-iii).![]()
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Affiliation(s)
- Yan Yang
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
| | - Honglie Shen
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
| | - Jiale Yang
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
| | - Kai Gao
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
| | - Zehui Wang
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
| | - Luanhong Sun
- College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China
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Atomic Simulations of (8,0)CNT-Graphene by SCC-DFTB Algorithm. NANOMATERIALS 2022; 12:nano12081361. [PMID: 35458069 PMCID: PMC9027127 DOI: 10.3390/nano12081361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 04/03/2022] [Accepted: 04/05/2022] [Indexed: 11/16/2022]
Abstract
Self-consistent density functional tight binding (SCC-DFTB) approaches were used to study optimized structures, energy, differential charge density, and Mülliken populations for the (8,0) carbon nanotubes (CNTs) connected to the graphene having different topology defects. Based on the calculations, nine seamless (8,0)CNT-graphenes were selected. For these connected systems, geometric configurations of the graphene and nanotubes were characterized, and the nearest neighbor length of C-C atoms and average length were obtained. The intrinsic energy, energy gap, and chemical potential were analyzed, and they presented apparent differences for different connection modes. Differential charge densities of these connection modes were analyzed to present covalent bonds between the atoms. We have also thoroughly analyzed the Mülliken charge transfer among the C atoms at the junctions.
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7
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Electrically Conductive Networks from Hybrids of Carbon Nanotubes and Graphene Created by Laser Radiation. NANOMATERIALS 2021; 11:nano11081875. [PMID: 34443706 PMCID: PMC8399117 DOI: 10.3390/nano11081875] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/18/2021] [Accepted: 07/20/2021] [Indexed: 11/17/2022]
Abstract
A technology for the formation of electrically conductive nanostructures from single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), and their hybrids with reduced graphene oxide (rGO) on Si substrate has been developed. Under the action of single pulses of laser irradiation, nanowelding of SWCNT and MWCNT nanotubes with graphene sheets was obtained. Dependences of electromagnetic wave absorption by films of short and long nanotubes with subnanometer and nanometer diameters on wavelength are calculated. It was determined from dependences that absorption maxima of various types of nanotubes are in the wavelength region of about 266 nm. It was found that contact between nanotube and graphene was formed in time up to 400 fs. Formation of networks of SWCNT/MWCNT and their hybrids with rGO at threshold energy densities of 0.3/0.5 J/cm2 is shown. With an increase in energy density above the threshold value, formation of amorphous carbon nanoinclusions on the surface of nanotubes was demonstrated. For all films, except the MWCNT film, an increase in defectiveness after laser irradiation was obtained, which is associated with appearance of C–C bonds with neighboring nanotubes or graphene sheets. CNTs played the role of bridges connecting graphene sheets. Laser-synthesized hybrid nanostructures demonstrated the highest hardness compared to pure nanotubes. Maximum hardness (52.7 GPa) was obtained for MWCNT/rGO topology. Regularity of an increase in electrical conductivity of nanostructures after laser irradiation has been established for films made of all nanomaterials. Hybrid structures of nanotubes and graphene sheets have the highest electrical conductivity compared to networks of pure nanotubes. Maximum electrical conductivity was obtained for MWCNT/rGO hybrid structure (~22.6 kS/m). Networks of nanotubes and CNT/rGO hybrids can be used to form strong electrically conductive interconnections in nanoelectronics, as well as to create components for flexible electronics and bioelectronics, including intelligent wearable devices (IWDs).
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Chen Q, Yan X, Wu L, Xiao Y, Wang S, Cheng G, Zheng R, Hao Q. Small-Nanostructure-Size-Limited Phonon Transport within Composite Films Made of Single-Wall Carbon Nanotubes and Reduced Graphene Oxides. ACS APPLIED MATERIALS & INTERFACES 2021; 13:5435-5444. [PMID: 33492119 DOI: 10.1021/acsami.0c20551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Nanocarbon materials have been widely used for nanoelectronics and energy-related applications. In this work, composite films consisting of reduced graphene oxides (rGOs) and single-wall carbon nanotubes (SWCNTs) are synthesized and studied for their in-plane thermal conductivities. Different from pristine carbon nanotubes or graphene with decreased thermal conductivities above 300 K, the in-plane thermal conductivities of these composite films are found to follow the trend of the specific heat of graphene from 100 to 400 K, i.e., monotonously increasing at elevated temperatures. Such a trend can often be found within amorphous solids but has seldom been observed for nanocarbon. This unique temperature dependence of thermal conductivities is attributed to the largely restricted phonon mean free paths within the graphene sheets that mainly contribute to the in-plane thermal transport. The highest in-plane thermal conductivity among samples with different synthesis conditions is 62.8 W/(m·K) at 300 K. Such a high thermal conductivity, combined with its unique temperature dependency, can be ideal for applications such as flexible film-like thermal diodes based on the junction between two materials with a large contrast for their temperature dependence of the thermal conductivity.
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Affiliation(s)
- Qiyu Chen
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Xiaolu Yan
- School of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China
| | - Leyuan Wu
- School of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China
| | - Yue Xiao
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Sien Wang
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
| | - Guoan Cheng
- School of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China
| | - Ruiting Zheng
- School of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China
| | - Qing Hao
- Department of Aerospace and Mechanical Engineering, University of Arizona, Tucson, Arizona 85721, United States
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9
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Junction-Producing Algorithm Connecting Carbon Nanotube to Carbon Nanocone to Obtain Funnel-Like Nanostructure: Nanochimney Generator. COATINGS 2020. [DOI: 10.3390/coatings10121267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study aims to provide a computational algorithm which contributes to the understanding and implementation of carbon nanochimneys. The structure resembles a tube ending with an inverted funnel, with a connection region that uses non-hexagonal rings as defects in order to match the boundaries of the two linked nanostructures. They are important for applications such as thermal transport, gas storage, or separation. The algorithm is written in Python 3.7 and provides a .pdb file with the coordinates of all the atoms included in the system. The parameters that can be specified are the carbon nanotube dimensions, for either armchair or zigzag conformations, five levels of disclination for the carbon nanocone along with the base diameter of the latter.
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10
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Gervilla V, Zarshenas M, Sangiovanni DG, Sarakinos K. Anomalous versus Normal Room-Temperature Diffusion of Metal Adatoms on Graphene. J Phys Chem Lett 2020; 11:8930-8936. [PMID: 32986445 PMCID: PMC7649840 DOI: 10.1021/acs.jpclett.0c02375] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 09/28/2020] [Indexed: 05/05/2023]
Abstract
Fabrication of high-performance heterostructure devices requires fundamental understanding of the diffusion dynamics of metal species on 2D materials. Here, we investigate the room-temperature diffusion of Ag, Au, Cu, Pd, Pt, and Ru adatoms on graphene using ab initio and classical molecular dynamics simulations. We find that Ag, Au, Cu, and Pd follow Lévy walks, in which adatoms move continuously within ∼1-4 nm2 domains during ∼0.04 ns timeframes, and they occasionally perform ∼2-4 nm flights across multiple surface adsorption sites. This anomalous diffusion pattern is associated with a flat (<50 meV) potential energy landscape (PEL), which renders surface vibrations important for adatom migration. The latter is not the case for Pt and Ru, which encounter a significantly rougher PEL (>100 meV) and, hence, migrate via conventional random walks. Thus, adatom anomalous diffusion is a potentially important aspect for modeling growth of metal films and nanostructures on 2D materials.
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Affiliation(s)
- Victor Gervilla
- Nanoscale
Engineering Division, Department of Physics, Chemistry and Biology, Linköping University, SE 581 83, Linköping, Sweden
| | - Mohammad Zarshenas
- Nanoscale
Engineering Division, Department of Physics, Chemistry and Biology, Linköping University, SE 581 83, Linköping, Sweden
| | - Davide G. Sangiovanni
- Theoretical
Physics Division, Department of Physics, Chemistry and Biology, Linköping University, SE 581 83, Linköping, Sweden
| | - Kostas Sarakinos
- Nanoscale
Engineering Division, Department of Physics, Chemistry and Biology, Linköping University, SE 581 83, Linköping, Sweden
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11
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Barai DP, Bhanvase BA, Sonawane SH. A Review on Graphene Derivatives-Based Nanofluids: Investigation on Properties and Heat Transfer Characteristics. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00865] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Divya P. Barai
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India
| | - Bharat A. Bhanvase
- Department of Chemical Engineering, Laxminarayan Institute of Technology, Rashtrasant Tukadoji Maharaj Nagpur University, Nagpur 440033, MS, India
| | - Shirish H. Sonawane
- Department of Chemical Engineering, National Institute of Technology, Warangal, 506004 Telangana State, India
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12
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Yousefi F, Khoeini F, Rajabpour A. Thermal rectification and interfacial thermal resistance in hybrid pillared-graphene and graphene: a molecular dynamics and continuum approach. NANOTECHNOLOGY 2020; 31:285707. [PMID: 32217831 DOI: 10.1088/1361-6528/ab8420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigate thermal rectification and thermal resistance in a hybrid pillared-graphene and graphene (PGG) system by both molecular dynamics (MD) simulation and a continuum model. First, the thermal conductivity of both pillared-graphene and graphene is calculated by employing MD simulation and Fourier's law. Our results show that the thermal conductivity of the pillared-graphene is much smaller than that of graphene by one order of magnitude. Next, by applying positive and negative temperature gradients along the longitudinal direction of the PGG, the thermal rectification is examined. The MD results indicate that for the lengths in the range of 3686 nm, the thermal rectification remains almost constant (~3%-5%). We have also studied the phonon density of states (DOS) on both sides of the interface of PGG. The DOS curves show that there is phonon scattering at low frequencies that depends on the imposed temperature gradient direction in the system. Therefore, we can introduce the PGG as a thermal rectifier at room temperature. Furthermore, next, we also explore the temperature distribution over the PGG by using the continuum model. The results obtained from the continuum model predict the MD results, such as the temperature distribution in the upper half-layer and lower full-layer graphene, the temperature gap, and also the thermal resistance at the interface. This study could help in the design of chip coolers, and phononic devices such as thermal nanodiodes.
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Affiliation(s)
- Farrokh Yousefi
- Department of Physics, University of Zanjan, Zanjan 45195-313, Iran
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13
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Chen XK, Chen KQ. Thermal transport of carbon nanomaterials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:153002. [PMID: 31796650 DOI: 10.1088/1361-648x/ab5e57] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The diversity of thermal transport properties in carbon nanomaterials enables them to be used in different thermal fields such as heat dissipation, thermal management, and thermoelectric conversion. In the past two decades, much effort has been devoted to study the thermal conductivities of different carbon nanomaterials. In this review, different theoretical methods and experimental techniques for investigating thermal transport in nanosystems are first summarized. Then, the thermal transport properties of various pure carbon nanomaterials including 1D carbon nanotubes, 2D graphene, 3D carbon foam, are reviewed in details and the associated underlying physical mechanisms are presented. Meanwhile, we discuss several important influences on the thermal conductivities of carbon nanomaterials, including size, structural defects, chemisorption and strain. Moreover, we introduce different nanostructuring pathways to manipulate the thermal conductivities of carbon-based nanocomposites and focus on the wave nature of phonons for controlling thermal transport. At last, we briefly review the potential applications of carbon nanomaterials in the fields of thermal devices and thermoelectric conversion.
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Affiliation(s)
- Xue-Kun Chen
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China. School of Mathematics and Physics, University of South China, Hengyang 421001, People's Republic of China
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14
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Thermally Reduced Graphene Oxide/Carbon Nanotube Composite Films for Thermal Packaging Applications. MATERIALS 2020; 13:ma13020317. [PMID: 32284495 PMCID: PMC7014255 DOI: 10.3390/ma13020317] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/05/2020] [Accepted: 01/07/2020] [Indexed: 11/28/2022]
Abstract
Thermally reduced graphene oxide/carbon nanotube (rGO/CNT) composite films were successfully prepared by a high-temperature annealing process. Their microstructure, thermal conductivity and mechanical properties were systematically studied at different annealing temperatures. As the annealing temperature increased, more oxygen-containing functional groups were removed from the composite film, and the percentage of graphene continuously increased. When the annealing temperature increased from 1100 to 1400 °C, the thermal conductivity of the composite film also continuously increased from 673.9 to 1052.1 W m−1 K−1. Additionally, the Young’s modulus was reduced by 63.6%, and the tensile strength was increased by 81.7%. In addition, the introduction of carbon nanotubes provided through-plane thermal conduction pathways for the composite films, which was beneficial for the improvement of their through-plane thermal conductivity. Furthermore, CNTs apparently improved the mechanical properties of rGO/CNT composite films. Compared with the rGO film, 1 wt% CNTs reduced the Young’s modulus by 93.3% and increased the tensile strength of the rGO/CNT composite film by 60.3%, which could greatly improve its flexibility. Therefore, the rGO/CNT composite films show great potential for application as thermal interface materials (TIMs) due to their high in-plane thermal conductivity and good mechanical properties.
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15
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Yu Z, Feng Y, Feng D, Zhang X. Thermal conductance bottleneck of a three dimensional graphene-CNT hybrid structure: a molecular dynamics simulation. Phys Chem Chem Phys 2019; 22:337-343. [PMID: 31815266 DOI: 10.1039/c9cp05228c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Three dimensional (3D) graphene-CNT hybrid structures (GCNTs) are promising materials for applications including capacitors and gas storage and separation devices, however until now their thermal conductance mechanism has scarcely been studied. These hybrid nanomaterials are particularly suitable as next-generation thermal interface materials due to the excellent thermal properties of carbon nanotubes and single atomic layer graphene. In this paper, the out-of-plane thermal conductivities of GCNTs, graphene nanomesh (GNM), and graphene sheets are investigated using molecular dynamics (MD) simulations which apply the Green-Kubo method. Distinct from GNMs and graphene sheets, the GCNTs exhibit a relatively high out-of-plane thermal conductivity, stemming from the CNTs' ability to accelerate the energy flow. However, the GCNT out-of-plane thermal conductivity is still far lower than that of pristine graphene due to extreme phonon localizations, which are concentrated on the graphene-CNT junction regions as evidenced by the participation ratio, phonon vibrational density of states, and overlap energy. This study provides microscopic insight into the GCNT heat transfer mechanism and offers design guidelines for application of GCNTs in thermal management devices.
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Affiliation(s)
- Zepei Yu
- School of Energy & Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
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16
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Zhuang S, Zhang F, Liu Y, Lu C. Exceptional high thermal conductivity of inter-connected annular graphite structures. Phys Chem Chem Phys 2019; 21:25495-25505. [PMID: 31714563 DOI: 10.1039/c9cp05216j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Based on the experimentally observed templating effects in CNTs containing carbon fibers, new types of inter-connected annular graphite structures are proposed and designed in order to significantly improve the cross-plane thermal conductivity of graphite. The calculations of the thermal conductivity of the newly designed structures were carried out by combining macroscopic continuous equations and microscopic molecular dynamic (MD) simulations. First, MD simulation was used to examine the influence of bending curvature on the in-plane thermal conductivity of a graphene sheet along and perpendicular to the rolling direction. Next, various types of annular graphite structures with single and inter-connected double/triple multi-layered graphite sheets were designed. Finally, finite element analysis was used to calculate the effective out of plane thermal conductivities of these structural models. The cross-plane thermal conductivity of a common graphite film is 2-3 orders of magnitude lower than its in-plane thermal conductivity, which strongly restricts its heat dissipation ability. However, the formation of annular graphite structures and the inter-connections of the outer layers lead to a dramatic improvement of effective out of plane thermal conductivity from 2.3 W m-1 K-1 to 799.8 W m-1 K-1 in this work, which is superior to common metal materials, especially considering the relatively lower density of carbon materials. These results would be valuable for designing and fabricating highly thermally conductive carbon materials for heat dissipation and temperature management.
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Affiliation(s)
- Shengyi Zhuang
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China. and National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
| | - Fengying Zhang
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
| | - Yaodong Liu
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China. and Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China and National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
| | - Chunxiang Lu
- Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China. and National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
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17
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Zheng Z, Jin J, Dong JC, Li B, Xu GK, Li JF, Shchukin DG. Unusual Sonochemical Assembly between Carbon Allotropes for High Strain-Tolerant Conductive Nanocomposites. ACS NANO 2019; 13:12062-12069. [PMID: 31532636 PMCID: PMC6812068 DOI: 10.1021/acsnano.9b06366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 09/18/2019] [Indexed: 06/10/2023]
Abstract
Facile methods toward strain-tolerant graphene-based electronic components remain scarce. Although being frequently used to disperse low-dimensional carbonaceous materials, ultrasonication (US) has never been reliable for fabricating stretchable carbonaceous nanocomposite (SCNC). Inspired by the unusual sonochemical assembly between graphene oxide (GO) and carbon nanotube (CNT), we verified the roots-like GO-CNT covalent bonding, rather than just π-π conjugation, was formed during US. In addition, the shockwave-induced collision in the binary-component system enables a burst of fragmentation at the early stage, spatially homogeneous hybridization, and time-dependent restoration of graphitic domains. All of the above are distinct from extensive fragmentation of a conventional single-component system and π-π conjugative assembly. The optimized SCNC exhibits conductivity comparable to reduced monolayer GO and outperforms π-π assemblies in retaining electrical conductance at a strain of 160%-among one of the best reported stretchable conductors. Raman analysis and mechanics simulation confirm the dominant role of counterweighing between the intrinsic and external strains on the mechano-response and durability of SCNC. This work suggests the guideline of creating multiple-component sonochemical systems for various functional nanocomposites.
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Affiliation(s)
- Zhaoliang Zheng
- Stephenson
Institute for Renewable Energy and Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom
| | - Jidong Jin
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Jin-Chao Dong
- MOE
Key Laboratory of Spectrochemical Analysis and Instrumentation, State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
| | - Bo Li
- Institute
of Biomechanics and Medical Engineering, AML, Department of Engineering
Mechanics, Tsinghua University, Beijing 100084, China
| | - Guang-Kui Xu
- International
Center for Applied Mechanics, State Key Laboratory for Strength and
Vibration of Mechanical Structures, Xi’an
Jiaotong University, Xi’an 710049, China
| | - Jian-Feng Li
- MOE
Key Laboratory of Spectrochemical Analysis and Instrumentation, State
Key Laboratory of Physical Chemistry of Solid Surfaces, College of
Chemistry and Chemical Engineering, Xiamen
University, Xiamen 361005, China
| | - Dmitry G. Shchukin
- Stephenson
Institute for Renewable Energy and Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, United Kingdom
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18
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Organically interconnected graphene flakes: A flexible 3-D material with tunable electronic bandgap. Sci Rep 2019; 9:13676. [PMID: 31548554 PMCID: PMC6757027 DOI: 10.1038/s41598-019-50037-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 08/07/2019] [Indexed: 11/23/2022] Open
Abstract
The structural and electronic properties of molecularly pillared graphene sheets were explored by performing Density Functional based Tight Binding calculations. Several different architectures were generated by varying the density of the pillars, the chemical composition of the organic molecule acting as a pillar and the pillar distribution. Our results show that by changing the pillars density and distribution we can tune the band gap transforming graphene from metallic to semiconducting in a continuous way. In addition, the chemical composition of the pillars affects the band gap in a lesser extent by introducing additional states in the valence or the conduction band and can act as a fine band gap tuning. These unique electronic properties controlled by design, makes Mollecular Pillared Graphene an excellent material for flexible electronics.
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19
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Govindaraj P, Fox B, Aitchison P, Hameed N. A Review on Graphene Polymer Nanocomposites in Harsh Operating Conditions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01183] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Premika Govindaraj
- Factory of the Future, Swinburne University of Technology, Melbourne 3127, VIC, Australia
| | - Bronwyn Fox
- Factory of the Future, Swinburne University of Technology, Melbourne 3127, VIC, Australia
| | | | - Nishar Hameed
- Factory of the Future, Swinburne University of Technology, Melbourne 3127, VIC, Australia
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20
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Yeandel SR, Molinari M, Parker SC. The impact of tilt grain boundaries on the thermal transport in perovskite SrTiO 3 layered nanostructures. A computational study. NANOSCALE 2018; 10:15010-15022. [PMID: 30052247 DOI: 10.1039/c8nr02234h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Thermal management at solid interfaces presents a technological challenge for modern thermoelectric power generation. Here, we define a computational protocol to identify nanoscale structural features that can facilitate thermal transport in technologically important nanostructured materials. We consider the highly promising thermoelectric material, SrTiO3, where tilt grain boundaries lower thermal conductivity. The magnitude of the reduction is shown to depend on compositional and structural arrangements at the solid interface. Quantitative analysis indicates that layered nanostructures less than 10 nm will be required to significantly reduce the thermal conductivity below the bulk value, and it will be virtually independent of temperature for films less than 2 nm depending on the orientation with a reduction of thermal transport up to 75%. At the nanoscale, the vibrational response of nanostructures shows concerted vibrations between the grain boundary and inter-boundary regions. As the grain boundary acts markedly as a phonon quencher, we predict that any manipulation of nanostructures to further reduce thermal conductivity will be more beneficial if applied to the inter-boundary region. Our findings may be applied more widely to benefit other technological applications where efficient thermal transport is important.
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Affiliation(s)
- Stephen R Yeandel
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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21
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Meng X, Pan H, Zhu C, Chen Z, Lu T, Xu D, Li Y, Zhu S. Coupled Chiral Structure in Graphene-Based Film for Ultrahigh Thermal Conductivity in Both In-Plane and Through-Plane Directions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:22611-22622. [PMID: 29888597 DOI: 10.1021/acsami.8b05514] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of high-performance thermal management materials to dissipate excessive heat both in plane and through plane is of special interest to maintain efficient operation and prolong the life of electronic devices. Herein, we designed and constructed a graphene-based composite film, which contains chiral liquid crystals (cellulose nanocrystals, CNCs) inside graphene oxide (GO). The composite film was prepared by annealing and compacting of self-assembled GO-CNC, which contains chiral smectic liquid crystal structures. The helical arranged nanorods of carbonized CNC act as in-plane connections, which bridge neighboring graphene sheets. More interestingly, the chiral structures also act as through-plane connections, which bridge the upper and lower graphene layers. As a result, the graphene-based composite film shows extraordinary thermal conductivity, in both in-plane (1820.4 W m-1 K-1) and through-plane (4.596 W m-1 K-1) directions. As a thermal management material, the heat dissipation and transportation behaviors of the composite film were investigated using a self-heating system and the results showed that the real-time temperature of the heater covered with the film was 44.5 °C lower than a naked heater. The prepared film shows a much higher efficiency of heat transportation than the commonly used thermal conductive Cu foil. Additionally, this graphene-based composite film exhibits excellent mechanical strength of 31.6 MPa and an electrical conductivity of 667.4 S cm-1. The strategy reported here may open a new avenue to the development of high-performance thermal management films.
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Affiliation(s)
- Xin Meng
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Hui Pan
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Chengling Zhu
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Zhixin Chen
- School of Mechanical, Materials & Mechatronics Engineering , University of Wollongong , Wollongong , NSW 2522 , Australia
| | - Tao Lu
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Da Xu
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Yao Li
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Shenmin Zhu
- State Key Laboratory of Metal Matrix Composites , Shanghai Jiao Tong University , Shanghai 200240 , China
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22
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Shi J, Zhong Y, Fisher TS, Ruan X. Decomposition of the Thermal Boundary Resistance across Carbon Nanotube-Graphene Junctions to Different Mechanisms. ACS APPLIED MATERIALS & INTERFACES 2018; 10:15226-15231. [PMID: 29613768 DOI: 10.1021/acsami.8b00826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Three different mechanisms are identified to contribute to thermal resistances across a carbon nanotube-graphene junction: material mismatch, nonplanar junction, and defects. To isolate the contributions of each mechanism, we have designed five types of junctions and performed nonequilibrium molecular dynamics simulations. The results show that the contributions from the three mechanisms are similar, each at around 2.5 × 10-11 m2 K/W. The relations between thermal boundary resistance and both defect number and turning angle at the interface are also studied.
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Affiliation(s)
- Jingjing Shi
- School of Mechanical Engineering and Birck Nanotechnology Center , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Yang Zhong
- School of Mechanical Engineering and Birck Nanotechnology Center , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Timothy S Fisher
- Department of Mechanical and Aerospace Engineering & California NanoSystems Institute , University of California Los Angeles , Los Angeles , California 90095 , United States
| | - Xiulin Ruan
- School of Mechanical Engineering and Birck Nanotechnology Center , Purdue University , West Lafayette , Indiana 47907 , United States
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23
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Gao P, Sun M, Wu X, Zhou S, Deng X, Xie Z, Xiao L, Jiang L, Huang Q. (B,N)-Doped 3D porous graphene–CNTs synthesized by chemical vapor deposition as a bi-functional catalyst for ORR and HER. RSC Adv 2018; 8:26934-26937. [PMID: 35541039 PMCID: PMC9083289 DOI: 10.1039/c8ra04048f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 07/10/2018] [Indexed: 11/25/2022] Open
Abstract
Novel (B,N)-doped three-dimensional (3D) porous graphene–carbon nanotubes (CNTs) can be used as an excellent alkaline and acid tolerant electrocatalyst for both the oxygen reduction reaction (ORR) and the hydrogen evolution reaction (HER). Based on density functional theory, the H and O atoms’ pre-and post-adsorption energy can effectively reduce the reaction energy barrier. A simple but very efficient two-step CVD method to prepare a (B,N)-doped 3D porous graphene–CNT hybrid material (B–N–G–CNT), and its catalytic performance for ORR and HER.![]()
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Affiliation(s)
- Pingping Gao
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
- College of Metallurgy and Materials Engineering
| | - Min Sun
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
| | - Xiaobo Wu
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
- College of Metallurgy and Materials Engineering
| | - Shuzhu Zhou
- College of Metallurgy and Materials Engineering
- Hunan University of Technology
- Hunan 412000
- PR China
| | - Xiaoting Deng
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
| | - Zhiyong Xie
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
| | - Li Xiao
- College of Metallurgy and Materials Engineering
- Hunan University of Technology
- Hunan 412000
- PR China
| | - Lihui Jiang
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- P. R.China
| | - Qizhong Huang
- State Key Laboratory for Powder Metallurgy
- Central South University
- Changsha 410083
- P. R. China
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24
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Varshney V, Unnikrishnan V, Lee J, Roy AK. Developing nanotube junctions with arbitrary specifications. NANOSCALE 2017; 10:403-415. [PMID: 29219154 DOI: 10.1039/c7nr06659g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Experimentally synthesized carbon nanotube (CNTs) junctions (either single or with 2D/3D CNT network topology) are expected to have random orientation of defect sites (non-hexagonal rings) around the junction. This random and irregular nature of the junction topology and defect characteristics is expected to affect their strength and durability as well as impact the associated mesoscopic and macroscopic properties. On the contrary, theoretical and computational studies often investigate structure-property relationships of pristine and regular junctions of carbon nanostructures. In this study, we developed a computational framework to model a variety of junction structures between CNTs with arbitrary spatial (orientation and degree of overlap) and intrinsic (chirality) specifications. The developed computational model also has the ability to tune the degree of topological defects around the junction via a variety of defect annihilation approaches. Our method makes use of the primal/dual meshing concept, where the development and manipulation of the junction nodes occur using triangular meshes (primal mesh), which is eventually converted to its dual mesh (honeycomb mesh) to render a fully covalently bonded CNT junction. Here each carbon atom has 3 bonded neighbors (mimicking sp2 hybridization). Under a given set of CNT orientation, overlap and chirality specifications, the approach creates a number of CNT junction configurations with varying degrees of energetic stability, offering an opportunity to investigate the effect of topological arrangement of defects around the junction on mechanical, electrical and thermal properties. In addition, it is shown via few examples that the discussed methodology can easily be extended to create multi-junction nanotube clusters, multi-wall nanotube junctions, as well as true 3D random network structures.
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Affiliation(s)
- Vikas Varshney
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA.
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25
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Sakhavand N, Shahsavari R. Asymmetric Junctions Boost in-Plane Thermal Transport in Pillared Graphene. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39122-39126. [PMID: 29095592 DOI: 10.1021/acsami.7b16162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hybrid 3D nanoarchitectures by covalent connection of 1D and 2D nanomaterials are currently in high demands to overcome the intrinsic anisotropy of the parent materials. This letter reports the junction configuration-mediated thermal transport properties of Pillared Graphene (PGN) using reverse nonequilibrium molecular dynamics simulations. The asymmetric junctions can offer ∼20% improved in-plane thermal transport in PGN, unlike the intuition that their wrinkled graphene sheets cause phonon scattering. This asymmetric trait, which entails lower phonon scattering provides a new degree of freedom to boost thermal properties of PGN and potentially other hybrid nanostructures.
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Affiliation(s)
- Navid Sakhavand
- Department of Civil and Environmental Engineering, ‡Department of Material Science and NanoEngineering, and §Smalley Institute for Nanoscale Science and Technology, Rice University , Houston, Texas 77005, United States
| | - Rouzbeh Shahsavari
- Department of Civil and Environmental Engineering, ‡Department of Material Science and NanoEngineering, and §Smalley Institute for Nanoscale Science and Technology, Rice University , Houston, Texas 77005, United States
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26
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Investigation of thermal energy transport interface of hybrid graphene-carbon nanotube/polyethylene nanocomposites. Sci Rep 2017; 7:14700. [PMID: 29089620 PMCID: PMC5666017 DOI: 10.1038/s41598-017-14710-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 10/13/2017] [Indexed: 12/02/2022] Open
Abstract
It is well known the thermal properties of three-dimensional (3-D) hybrid graphene (GR)-carbon nanotube (CNT) structures are not superior to that of the individual GR and CNT, however, the 3-D hybrid GR-CNT structures can effectively improve the thermal properties of polymer matrix. Therefore, understanding the thermal energy transport in the interface between polymer matrix and 3-D hybrid GR-CNT structure is essential. Here, the enhancement mechanism of interfacial thermal transport of hybrid GR-CNT structure was explored by applying non-equilibrium molecular dynamics (NEMD) simulations. Three different types of hybrid GR-CNT structures were built. The influences of CNT radius and CNT type for the hybrid GR-CNT on the interfacial thermal properties were also analyzed. Computational results show that among the three different types of hybrid GR-CNT structures, the Model-I, i.e., the covalent bond hybrid GR-CNT structures are of the best interfacial thermal properties. Meanwhile, the CNT radius of hybrid GR-CNT structure has a great influence on the interfacial thermal properties.
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27
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Bauer J, Meza LR, Schaedler TA, Schwaiger R, Zheng X, Valdevit L. Nanolattices: An Emerging Class of Mechanical Metamaterials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28873250 DOI: 10.1002/adma.201701850] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/23/2017] [Indexed: 05/12/2023]
Abstract
In 1903, Alexander Graham Bell developed a design principle to generate lightweight, mechanically robust lattice structures based on triangular cells; this has since found broad application in lightweight design. Over one hundred years later, the same principle is being used in the fabrication of nanolattice materials, namely lattice structures composed of nanoscale constituents. Taking advantage of the size-dependent properties typical of nanoparticles, nanowires, and thin films, nanolattices redefine the limits of the accessible material-property space throughout different disciplines. Herein, the exceptional mechanical performance of nanolattices, including their ultrahigh strength, damage tolerance, and stiffness, are reviewed, and their potential for multifunctional applications beyond mechanics is examined. The efficient integration of architecture and size-affected properties is key to further develop nanolattices. The introduction of a hierarchical architecture is an effective tool in enhancing mechanical properties, and the eventual goal of nanolattice design may be to replicate the intricate hierarchies and functionalities observed in biological materials. Additive manufacturing and self-assembly techniques enable lattice design at the nanoscale; the scaling-up of nanolattice fabrication is currently the major challenge to their widespread use in technological applications.
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Affiliation(s)
- Jens Bauer
- Department of Mechanical and Aerospace Engineering, University of California Irvine, CA, 92697, USA
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Lucas R Meza
- Engineering Department, Trumpington Street, Cambridge, CB2 1PZ, UK
| | | | - Ruth Schwaiger
- Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Xiaoyu Zheng
- Department of Mechanical Engineering, Virginia Tech, 635 Prices Fork Road, Blacksburg, VA, 24061, USA
| | - Lorenzo Valdevit
- Department of Mechanical and Aerospace Engineering, University of California Irvine, CA, 92697, USA
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28
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Cheng T, Yu B, Cao L, Tan H, Li X, Zheng X, Li W, Ren Z, Bai J. Synthesis and loading-dependent characteristics of nitrogen-doped graphene foam/carbon nanotube/manganese oxide ternary composite electrodes for high performance supercapacitors. J Colloid Interface Sci 2017; 501:1-10. [DOI: 10.1016/j.jcis.2017.04.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 04/08/2017] [Accepted: 04/11/2017] [Indexed: 12/25/2022]
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29
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Senturk AE, Oktem AS, Konukman AES. Effects of the nitrogen doping configuration and site on the thermal conductivity of defective armchair graphene nanoribbons. J Mol Model 2017; 23:247. [DOI: 10.1007/s00894-017-3415-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 07/06/2017] [Indexed: 11/28/2022]
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30
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Qian HJ, Eres G, Irle S. Quantum chemical molecular dynamics simulation of carbon nanotube–graphene fusion. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1328555] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Hu-Jun Qian
- State Key Laboratory of Superamolecular Structure and Materials, Jilin University, Changchun, P.R. China
- Department of Chemistry, WPI-Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, Japan
| | - Gyula Eres
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Stephan Irle
- Department of Chemistry, WPI-Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, Japan
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31
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Rashidi V, Coyle EJ, Sebeck K, Kieffer J, Pipe KP. Thermal Conductance in Cross-linked Polymers: Effects of Non-Bonding Interactions. J Phys Chem B 2017; 121:4600-4609. [DOI: 10.1021/acs.jpcb.7b01377] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vahid Rashidi
- Department of Mechanical Engineering, ‡Department of Materials Science and
Engineering, and §Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Eleanor J. Coyle
- Department of Mechanical Engineering, ‡Department of Materials Science and
Engineering, and §Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Katherine Sebeck
- Department of Mechanical Engineering, ‡Department of Materials Science and
Engineering, and §Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - John Kieffer
- Department of Mechanical Engineering, ‡Department of Materials Science and
Engineering, and §Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Kevin P. Pipe
- Department of Mechanical Engineering, ‡Department of Materials Science and
Engineering, and §Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109, United States
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32
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Bian J, Wang G, Lin HL, Zhou X, Wang ZJ, Xiao WQ, Zhao XW. HDPE composites strengthened-toughened synergistically by l
-aspartic acid functionalized graphene/carbon nanotubes hybrid nanomaterials. J Appl Polym Sci 2017. [DOI: 10.1002/app.45055] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- J. Bian
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - G. Wang
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - H. L. Lin
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - X. Zhou
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - Z. J. Wang
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - W. Q. Xiao
- School of Materials Science and Engineering; Xi-Hua University; Chengdu Sichuan 610039 China
| | - X. W. Zhao
- Department of Physics; Tokyo University of Science; Shinjuku-Ku Tokyo 162-8601 Japan
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33
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Yang Y, Kim ND, Varshney V, Sihn S, Li Y, Roy AK, Tour JM, Lou J. In situ mechanical investigation of carbon nanotube-graphene junction in three-dimensional carbon nanostructures. NANOSCALE 2017; 9:2916-2924. [PMID: 28181613 DOI: 10.1039/c6nr09897e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Hierarchically organized three-dimensional (3D) carbon nanotubes/graphene (CNTs/graphene) hybrid nanostructures hold great promises in composite and battery applications. Understanding the junction strength between CNTs and graphene is crucial for utilizing such special nanostructures. Here, in situ pulling an individual CNT bundle out of graphene is carried out for the first time using a nanomechanical tester developed in-house, and the measured junction strength of CNTs/graphene is 2.23 ± 0.56 GPa. The post transmission electron microscopy (TEM) analysis of remained graphene after peeling off CNT forest confirms that the failure during pull-out test occurs at the CNT-graphene junction. Such a carefully designed study makes it possible to better understand the interfacial interactions between CNTs and graphene in the 3D CNTs/graphene nanostructures. The coupled experimental and computational effort suggests that the junction between the CNTs and the graphene layer is likely to be chemically bonded, or at least consisting of a mixture of chemical bonding and van der Waals interactions.
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Affiliation(s)
- Yingchao Yang
- Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
| | - Nam Dong Kim
- Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77005, USA
| | - Vikas Varshney
- Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXAN, Wright-Patterson AFB, OH 45433, USA. and Universal Technology Corporation, 1270 N. Fairfield Road, Dayton, OH 45432, USA
| | - Sangwook Sihn
- Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXAN, Wright-Patterson AFB, OH 45433, USA. and University of Dayton Research Institute, 300 College Park, Dayton, OH 45469, USA
| | - Yilun Li
- Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77005, USA
| | - Ajit K Roy
- Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXAN, Wright-Patterson AFB, OH 45433, USA.
| | - James M Tour
- Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA. and Department of Chemistry, Rice University, 6100 Main Street, Houston, TX 77005, USA and NanoCarbon Center, Rice University, 6100 Main Street, Houston, TX 77005, USA
| | - Jun Lou
- Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA.
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Zhou C, Senegor R, Baron Z, Chen Y, Raju S, Vyas AA, Chan M, Chai Y, Yang CY. Synthesis and interface characterization of CNTs on graphene. NANOTECHNOLOGY 2017; 28:054007. [PMID: 28029110 DOI: 10.1088/1361-6528/28/5/054007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Carbon nanotubes (CNTs) and graphene are potential candidates for future interconnect materials. CNTs are promising on-chip via interconnect materials due to their readily formed vertical structures, their current-carrying capacity, which is much larger than existing on-chip interconnect materials such as copper and tungsten, and their demonstrated ability to grow in patterned vias with sub-50 nm widths; meanwhile, graphene is suitable for horizontal interconnects. However, they both present the challenge of having high-resistance contacts with other conductors. An all-carbon structure is proposed in this paper, which can be formed using the same chemical vapor deposition method for both CNTs and graphene. Vertically aligned CNTs are grown directly on graphene with an Fe or Ni catalyst. The structural characteristics of the graphene and the grown CNTs are analyzed using Raman spectroscopy and electron microscopy techniques. The CNT-graphene interface is studied in detail using transmission electron microscopic analysis of the CNT-graphene heterostructure, which suggests C-C bonding between the two materials. Electrical measurement results confirm the existence of both a lateral conduction path within graphene and a vertical conduction path in the CNT-graphene heterostructure, giving further support to the C-C bonding at the CNT-graphene interface and resulting in potential applications for all-carbon interconnects.
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Affiliation(s)
- Changjian Zhou
- School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
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Yang X, Yu D, Cao B, To AC. Ultrahigh Thermal Rectification in Pillared Graphene Structure with Carbon Nanotube-Graphene Intramolecular Junctions. ACS APPLIED MATERIALS & INTERFACES 2017; 9:29-35. [PMID: 27936563 DOI: 10.1021/acsami.6b12853] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this letter, graded pillared graphene structures with carbon nanotube-graphene intramolecular junctions are demonstrated to exhibit ultrahigh thermal rectification. The designed graded two-stage pillared graphene structures are shown to have rectification values of 790.8 and 1173.0% at average temperatures 300 and 200 K, respectively. The ultrahigh thermal rectification is found to be a result of the obvious phonon spectra mismatch before and after reversing the applied thermal bias. This outcome is attributed to both the device shape asymmetry and the size asymmetric boundary thermal contacts. We also find that the significant and stable standing waves that exist in graded two-stage pillared graphene structures play an important role in this kind of thermal rectifier, and are responsible for the ultrahigh thermal rectification of the two-stage ones as well. Our work demonstrates that pillared graphene structure with SWCNT-graphene intramolecular junctions is an excellent and promising phononic device.
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Affiliation(s)
- Xueming Yang
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University , Beijing 100084, China
- Department of Power Engineering, North China Electric Power University , Baoding 071003, China
| | - Dapeng Yu
- Department of Power Engineering, North China Electric Power University , Baoding 071003, China
| | - Bingyang Cao
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Engineering Mechanics, Tsinghua University , Beijing 100084, China
| | - Albert C To
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
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36
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Tiwari N, Agarwal N, Roy D, Mukhopadhyay K, Prasad NE. Tailor Made Conductivities of Polymer Matrix for Thermal Management: Design and Development of Three-Dimensional Carbonaceous Nanostructures. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b03245] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Neeru Tiwari
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Neha Agarwal
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Debmalya Roy
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Kingsuk Mukhopadhyay
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
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38
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Liu J. Graphene Foam (GF)/Carbon Nanotubes (CNTs) Hybrid Film-Based High-Performance Flexible Asymmetric Supercapacitors. GRAPHENE-BASED COMPOSITES FOR ELECTROCHEMICAL ENERGY STORAGE 2017. [DOI: 10.1007/978-981-10-3388-9_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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39
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Song N, Pan H, Hou X, Cui S, Shi L, Ding P. Enhancement of thermal conductivity in polyamide-6/graphene composites via a “bridge effect” of silicon carbide whiskers. RSC Adv 2017. [DOI: 10.1039/c7ra09094c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
It is urgent to manufacture a polymer composite that has high thermal conductivity (especially in the through-plane direction) and mechanical properties simultaneously to meet the heat dissipation requirement of electronic devices.
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Affiliation(s)
- Na Song
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Haidong Pan
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Xingshuang Hou
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Siqi Cui
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Liyi Shi
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Peng Ding
- Research Center of Nanoscience and Nanotechnology
- Shanghai University
- Shanghai 200444
- P. R. China
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40
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Chen J, Walther JH, Koumoutsakos P. Ultrafast cooling by covalently bonded graphene-carbon nanotube hybrid immersed in water. NANOTECHNOLOGY 2016; 27:465705. [PMID: 27758979 DOI: 10.1088/0957-4484/27/46/465705] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The increasing power density and the decreasing dimensions of transistors present severe thermal challenges to the design of modern microprocessors. Furthermore, new technologies such as three-dimensional chip-stack architectures require novel cooling solutions for their thermal management. Here, we demonstrate, through transient heat-dissipation simulations, that a covalently bonded graphene-carbon nanotube (G-CNT) hybrid immersed in water is a promising solution for the ultrafast cooling of such high-temperature and high heat-flux surfaces. The G-CNT hybrid offers a unique platform to integrate the superior axial heat transfer capability of individual CNTs via their parallel arrangement. The immersion of the G-CNT in water enables an additional heat dissipation path via the solid-liquid interaction, allowing for the sustainable cooling of the hot surface under a constant power input of up to 10 000 W cm-2.
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Affiliation(s)
- Jie Chen
- Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China. Institute for Advanced Study, Tongji University, Shanghai 200092, People's Republic of China
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41
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Wei Z, Wehmeyer G, Dames C, Chen Y. Geometric tuning of thermal conductivity in three-dimensional anisotropic phononic crystals. NANOSCALE 2016; 8:16612-16620. [PMID: 27424558 DOI: 10.1039/c6nr04199j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Molecular dynamics simulations are performed to investigate the thermal transport properties of a three-dimensional (3D) anisotropic phononic crystal consisting of silicon nanowires and films. The calculation shows that the in-plane thermal conductivity is negatively correlated with the out-of-plane thermal conductivity upon making geometric changes, whether varying the nanowire diameter or the film thickness. This enables the anisotropy ratio of thermal conductivity to be tailored over a wide range, in some cases by more than a factor of 20. Similar trends in thermal conductivity are also observed from an independent phonon ray tracing simulation considering only diffuse boundary scattering effects, though the range of anisotropy ratios is smaller than that obtained in MD simulation. By analyzing the phonon dispersion relation with varied geometric parameters, it is found that increasing the nanowire diameter increases the out-of-plane acoustic phonon group velocities, but reduces the in-plane longitudinal and fast transverse acoustic phonon group velocities. The calculated phonon irradiation further verified the negative correlation between the in-plane and the out-of-plane thermal conductivity. The proposed 3D phononic crystal may find potential application in thermoelectrics, energy storage, catalysis and sensing applications owing to its widely tailorable thermal conductivity.
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Affiliation(s)
- Zhiyong Wei
- Jiangsu Key Laboratory for Design & Manufacture of Micro/Nano Biomedical Instruments and School of Mechanical Engineering, Southeast University, Nanjing 210096, People's Republic of China.
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42
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43
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Mandal D, Kumar Dash S, Das B, Chattopadhyay S, Ghosh T, Das D, Roy S. Bio-fabricated silver nanoparticles preferentially targets Gram positive depending on cell surface charge. Biomed Pharmacother 2016; 83:548-558. [PMID: 27449536 DOI: 10.1016/j.biopha.2016.07.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 07/01/2016] [Accepted: 07/07/2016] [Indexed: 01/24/2023] Open
Abstract
Recently bio-inspired experimental processes for synthesis of nanoparticles are receiving significant attention in nanobiotechnology. Silver nanoparticles (Ag NPs) have been used very frequently in recent times to the wounds, burns and bacterial infections caused by drug-resistant microorganisms. Though, the antibacterial effects of Ag NPs on some multi drug-resistant bacteria specially against Gram positive bacteria has been established, but further investigation is needed to elicit its effectiveness against Gram negatives and to identify the probable mechanism of action. Thus, the present study was conducted to synthesize Ag NPs using Andrographis paniculata leaf extract and to investigate its antibacterial efficacy. After synthesis process the biosynthesized nanoparticles were purified and characterized with the help of various physical measurement techniques which raveled their purity, stability and small size range. The antimicrobial activity of Ag NPs was determined against both Gram-positive Enterococcus faecalis and Gram-negative Proteus vulgaris. Results showed comparatively higher antibacterial efficacy of Ag NPs against Gram positive Enterococcus faecalis strains. It was found that greater difference in zeta potential values between Gram positive bacteria and Ag NPs triggers better internalization of the particles. Thus the cell surface charge played vital role in cell killing which was confirmed by surface zeta potential study. Finally it may be concluded that green synthesized Ag NPs using Andrographis paniculata leaf extract can be very useful against both multi drug resistant Gram-positive and Gram-negative bacteria.
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Affiliation(s)
- Debasis Mandal
- Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore-721 102, West Bengal, India
| | - Sandeep Kumar Dash
- Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore-721 102, West Bengal, India
| | - Balaram Das
- Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore-721 102, West Bengal, India
| | - Sourav Chattopadhyay
- Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore-721 102, West Bengal, India
| | - Totan Ghosh
- Department of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel
| | - Debasis Das
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700 009, India
| | - Somenath Roy
- Immunology and Microbiology Laboratory, Department of Human Physiology with Community Health, Vidyasagar University, Midnapore-721 102, West Bengal, India.
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44
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Deng K, Li X, Huang H. Synthesis of a novel triad hybrid of noncovalent-assembled nickel (II) norcorrole on graphene oxide encapsulated multiwalled carbon nanotubes and its application. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.04.060] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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45
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Deng K, Zhou J, Huang H, Ling Y, Li C. Electrochemical Determination of Nitrite Using a Reduced Graphene Oxide–Multiwalled Carbon Nanotube-Modified Glassy Carbon Electrode. ANAL LETT 2016. [DOI: 10.1080/00032719.2016.1163364] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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46
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Pykal M, Jurečka P, Karlický F, Otyepka M. Modelling of graphene functionalization. Phys Chem Chem Phys 2016; 18:6351-72. [DOI: 10.1039/c5cp03599f] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This perspective describes the available theoretical methods and models for simulating graphene functionalization based on quantum and classical mechanics.
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Affiliation(s)
- Martin Pykal
- Regional Centre of Advanced Technologies and Materials
- Department of Physical Chemistry
- Faculty of Science
- Palacký University Olomouc
- 771 46 Olomouc
| | - Petr Jurečka
- Regional Centre of Advanced Technologies and Materials
- Department of Physical Chemistry
- Faculty of Science
- Palacký University Olomouc
- 771 46 Olomouc
| | - František Karlický
- Regional Centre of Advanced Technologies and Materials
- Department of Physical Chemistry
- Faculty of Science
- Palacký University Olomouc
- 771 46 Olomouc
| | - Michal Otyepka
- Regional Centre of Advanced Technologies and Materials
- Department of Physical Chemistry
- Faculty of Science
- Palacký University Olomouc
- 771 46 Olomouc
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47
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Niu J, Xia Z. Template-directed growth and mechanical properties of carbon nanotube–graphene junctions with nano-fillets: molecular dynamic simulation. RSC Adv 2016. [DOI: 10.1039/c6ra11844e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nano-fillet enhances both the stability and mechanical properties of carbon nanotube–graphene junctions synthesized by a templating method.
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Affiliation(s)
- Jianbing Niu
- Department of Materials Science and Engineering
- University of North Texas
- Denton TX 76203
- USA
| | - Zhenhai Xia
- Department of Materials Science and Engineering
- University of North Texas
- Denton TX 76203
- USA
- Department of Chemistry
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48
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Wesołowski RP, Terzyk AP. Dynamics of effusive and diffusive gas separation on pillared graphene. Phys Chem Chem Phys 2016; 18:17018-23. [DOI: 10.1039/c6cp02392d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In this study we examine the ability of pillared graphene membranes to separate the species of two gas mixtures that are important from an industrial point of view: air and coal gas.
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Affiliation(s)
- Radosław P. Wesołowski
- Faculty of Chemistry
- Physicochemistry of Carbon Materials Research Group
- Nicolaus Copernicus University in Toruń
- 87-100 Toruń
- Poland
| | - Artur P. Terzyk
- Faculty of Chemistry
- Physicochemistry of Carbon Materials Research Group
- Nicolaus Copernicus University in Toruń
- 87-100 Toruń
- Poland
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49
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Kholmanov I, Kim J, Ou E, Ruoff RS, Shi L. Continuous Carbon Nanotube-Ultrathin Graphite Hybrid Foams for Increased Thermal Conductivity and Suppressed Subcooling in Composite Phase Change Materials. ACS NANO 2015; 9:11699-11707. [PMID: 26529570 DOI: 10.1021/acsnano.5b02917] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Continuous ultrathin graphite foams (UGFs) have been actively researched recently to obtain composite materials with increased thermal conductivities. However, the large pore size of these graphitic foams has resulted in large thermal resistance values for heat conduction from inside the pore to the high thermal conductivity graphitic struts. Here, we demonstrate that the effective thermal conductivity of these UGF composites can be increased further by growing long CNT networks directly from the graphite struts of UGFs into the pore space. When erythritol, a phase change material for thermal energy storage, is used to fill the pores of UGF-CNT hybrids, the thermal conductivity of the UGF-CNT/erythritol composite was found to increase by as much as a factor of 1.8 compared to that of a UGF/erythritol composite, whereas breaking the UGF-CNT bonding in the hybrid composite resulted in a drop in the effective room-temperature thermal conductivity from about 4.1 ± 0.3 W m(-1) K(-1) to about 2.9 ± 0.2 W m(-1) K(-1) for the same UGF and CNT loadings of about 1.8 and 0.8 wt %, respectively. Moreover, we discovered that the hybrid structure strongly suppresses subcooling of erythritol due to the heterogeneous nucleation of erythritol at interfaces with the graphitic structures.
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Affiliation(s)
- Iskandar Kholmanov
- Texas Materials Institute and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
- CNR-INO, Sensor Lab, The University of Brescia , Via Branze 45, 25123, Brescia, Italy
| | - Jaehyun Kim
- Texas Materials Institute and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Eric Ou
- Texas Materials Institute and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
| | - Rodney S Ruoff
- Center for Multidimensional Carbon Materials, Institute for Basic Science (IBS) , Ulsan 689-798, Republic of Korea
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Republic of Korea
| | - Li Shi
- Texas Materials Institute and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States
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Hu Y, Wu G, Lan T, Zhao J, Liu Y, Chen W. A Graphene-Based Bimorph Structure for Design of High Performance Photoactuators. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:7867-73. [PMID: 26498737 DOI: 10.1002/adma.201502777] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 08/10/2015] [Indexed: 05/27/2023]
Abstract
A photoactuator based on a tubular-shaped graphene composite bimorph is fabricated and shows reversible photoactuation with fast response and large deformation (deformation angle of ca. 479° in only 3.6 s), which is mostly attributed to the interfacial thermal stress. Various photoactuator devices based on the tubular bimorph, including a smart box and crawler-type robot that can mimic tank-track motion, are designed.
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Affiliation(s)
- Ying Hu
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
| | - Guan Wu
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
| | - Tian Lan
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
| | - Jingjing Zhao
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
| | - Yang Liu
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
| | - Wei Chen
- i-Lab, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, P. R. China
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