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Abbaspour M. Polyoxometalate ionic liquid between graphene oxide surfaces as a new membrane in the desalination process: a molecular dynamics study. Phys Chem Chem Phys 2023; 25:13654-13664. [PMID: 37145119 DOI: 10.1039/d2cp05486h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In this study, the performance of the positioning of polyoxometalate ionic liquid ([Keggin][emim]3 IL) between graphene oxide (GO) plates with different concentrations (nIL-GO (n = 1-4)) were examined in the desalination process at different external pressures using molecular dynamics (MD) simulations. The use of Keggin anions with charged GO layers was also investigated in the desalination process. The potential of the mean force, average number of hydrogen bonds, self-diffusion coefficient, and angle distribution function were calculated and discussed. The results showed that although the presence of polyoxometalate ILs between the GO plates decreases water flux, they efficiently increase salt rejection. The positioning of one IL increases salt rejection to two times at lower pressure and increases it up to four times at higher pressure. Moreover, the positioning of four ILs results in almost complete salt rejection at all pressures. The use of only Keggin anions between the charged GO plates (n[Keggin]-GO+3n) presents more water flux and a smaller salt rejection rate than the nIL-GO systems. However, the n[Keggin]-GO+3n systems show a nearly complete salt rejection at high concentrations of Keggin anions. These systems also have a smaller risk of the contamination of the desalinated water by the probable escape of cations from the nanostructure to the desalinated water at very high pressures.
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Affiliation(s)
- Mohsen Abbaspour
- Department of Chemistry, Hakim Sabzevari University, Sabzevar, Iran.
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2
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Hizi A, Forster GD, Ferrando R, Garreau Y, Coati A, Andreazza-Vignolle C, Andreazza P. Combined atomistic simulations to explore metastability and substrate effects in Ag-Co nanoalloy systems. Faraday Discuss 2023; 242:35-51. [PMID: 36349781 DOI: 10.1039/d2fd00114d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The Ag/Co nanoalloy system is a model system situated energetically at the limit of stability of the core-shell chemical ordering with respect to a simple phase separation behavior. This makes the system highly susceptible to effects of the environment, such as interaction with a substrate. However, kinetic effects may also be exploited by careful atom-by-atom particle growth that allows to lock in certain out-of-equilibrium configurations, such as off-center, quasi-Janus and even Janus type particles. In this contribution, we explore to what extent out-of-equilibrium structures are due to kinetic effects and the influence of the interaction of the particles with an amorphous carbon substrate by a joint experimental and molecular dynamics study. The simulation set up performed at 300 K and 600 K mimicks the experimental growth process. The substrate deforms the particles, but has also an ordering effect on particle orientation and particle structure. In the case of growth of Ag on Co seeds, particles assume close to equilibrium quasi-Janus structures, while for the deposition of Co on Ag seeds, highly out-of-equilibrium structures with several subsurface Co clusters are obtained.
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Affiliation(s)
- Abir Hizi
- Interfaces, Confinement, Matériaux et Nanostructures (ICMN), Université d'Orléans, CNRS, Orléans, France.
| | - Georg Daniel Forster
- Interfaces, Confinement, Matériaux et Nanostructures (ICMN), Université d'Orléans, CNRS, Orléans, France.
| | | | | | | | | | - Pascal Andreazza
- Interfaces, Confinement, Matériaux et Nanostructures (ICMN), Université d'Orléans, CNRS, Orléans, France.
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3
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Tafrishi H, Sadeghzadeh S, Ahmadi R. Molecular dynamics simulations of phase change materials for thermal energy storage: a review. RSC Adv 2022; 12:14776-14807. [PMID: 35702228 PMCID: PMC9112287 DOI: 10.1039/d2ra02183h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 04/18/2022] [Indexed: 02/05/2023] Open
Abstract
Phase change materials (PCM) have had a significant role as thermal energy transfer fluids and nanofluids and as media for thermal energy storage. Molecular dynamics (MD) simulations, can play a significant role in addressing several thermo-physical problems of PCMs at the atomic scale by providing profound insights and new information. In this paper, the reviewed research is classified into five groups: pure PCM, mixed PCM, PCM containing nanofillers, nano encapsulated PCM, and PCM in nanoporous media. A summary of the equilibrium and non-equilibrium MD simulations of PCMs and their results is presented as well. The primary results of the simulated systems are demonstrated to be efficient in manufacturing phase change materials with better thermal energy storage features. The goals of these studies are to achieve higher thermal conductivity, higher thermal capacity, and lower density change, determine the melting point, and understand the molecular behaviors of PCM composites. A molecular dynamics-based grouping (PCM simulation table) was presented that is very useful for the future roadmap of PCM simulation. In the end, the PCFF force field is presented in detail and a case problem is studied for more clarity. The results show that simulating the PCMs with a similar strategy could be performed systematically. Results of investigations of thermal conductivity enhancement showed that this characteristic can be increased at the nano-scale by the orientation of PCM molecules. Phase change materials (PCM) have had a significant role as thermal energy transfer fluids and nanofluids and as media for thermal energy storage.![]()
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Affiliation(s)
- Hossein Tafrishi
- MSc Student of Energy Systems Engineering, School of Advanced Technologies, Iran University of Science and technology Tehran Iran
| | - Sadegh Sadeghzadeh
- Associate Professor of Nanotechnology Engineering, School of Advanced Technologies, Iran University of Science and Technology Tehran Iran
| | - Rouhollah Ahmadi
- Associate Professor of Energy Systems Engineering, School of Advanced Technologies, Iran University of Science and Technology Tehran Iran
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Abbaspour M, Akbarzadeh H, Namayandeh Jorabchi M, Salemi S, Ahmadi N. Investigation of doped carbon nanotubes on desalination process using molecular dynamics simulations. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118040] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Abbaspour M, Jorabchi MN, Akbarzadeh H, Ebrahimnejad A. Investigation of the thermal properties of phase change materials encapsulated in capped carbon nanotubes using molecular dynamics simulations. RSC Adv 2021; 11:24594-24606. [PMID: 35481038 PMCID: PMC9036877 DOI: 10.1039/d1ra02033a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 06/24/2021] [Indexed: 11/21/2022] Open
Abstract
Due to the high demand for clean, economic, and recyclable energy, phase change materials (PCMs) have received significant attention in recent years. To improve the performance of PCMs, they are confined in micro- and nano-capsules composed of organic or inorganic materials. In this study, encapsulated phase change material (EPCM) systems were constructed with paraffin molecules as the core material and capped carbon nanotubes (CNTs) as the shell. We investigated the effects of different parameters including CNT diameter, length, and chirality and the length of the alkane molecule chain. We also investigated metal nanocluster-enhanced PCM systems via the addition of Cu, Ag, and Al clusters to the EPCM systems. Different thermodynamic, dynamic, and structural properties including configurational energy, melting range, mean square displacement, self-diffusion coefficient, radial distribution function (RDF), and average end-to-end distance of the confined molecules were examined. We also investigated the effect of metal doping in CNT on the different properties of the confined PCM. The results indicated that a longer CNT has a lower melting point than the normal CNT system. It was also observed that the bigger (30,0) CNT, (14,14) armchair CNT, and icosane systems have higher melting ranges than the normal (25,0) system. The metal cluster systems also have a lower starting melting point than the normal system. Furthermore, it was found that the Al cluster system has the lowest starting melting point among the studied systems. Nanocluster enhanced PCM and metal doped CNT PCM systems have lower melting points than the normal system.![]()
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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: 7] [Impact Index Per Article: 1.8] [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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Seo KJ, Kim DE. Molecular dynamics investigation on the nano-mechanical behaviour of C 60 fullerene and its crystallized structure. NANOSCALE 2020; 12:9849-9858. [PMID: 32342956 DOI: 10.1039/d0nr00584c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
C60 fullerene has been utilized in various applications, including low friction and wear coatings, due to its unique molecular structure. In this work, molecular dynamics simulations were conducted to assess the nano-mechanical behaviour of a single C60 fullerene and its crystallized structure. A single C60 model and a model of a face-centred cubic structured C60 crystal with a one-unit-cell thickness were prepared for compression and unloading simulations based on the adaptive intermolecular reactive empirical bond-order potential for carbon. Force-displacement curves and molecule-averaged virial stresses were obtained during the simulation. The models applied during the compression and unloading processes were visualized to confirm the deformation behaviour. Both the single and crystal C60 models showed a perfectly reversible deformation before the point of force decrease that occurred during compression. In particular, the face-centred cubic structure of the crystal C60 model was severely altered during compression before the individual C60 molecules experienced permanent deformation. The maximum values of the normal virial stress in the compression direction before the permanent deformation of the molecules were almost same for both the single and crystallized models.
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Affiliation(s)
- Kuk-Jin Seo
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea.
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8
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Abbaspour M, Akbarzadeh H, Zaeifi S. Thermodynamics, Structure, and Dynamic Properties of Nanostructured Water Confined into B-, N-, and Si-Doped Graphene Surfaces and Carbon Nanotubes. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00119] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohsen Abbaspour
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
| | - Hamed Akbarzadeh
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
| | - Shadi Zaeifi
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
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9
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Lotfi S, Abbaspour M. Investigation of temperature and pressure effects on thermodynamics and structural properties of gold nanoparticles formed during the gas condensation procedure. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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A comparative study of graphite and CNT supported Au-Ag, Au-Pd, Au-Pt and Au-Rh nanoalloys using MD simulation. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Tran-Khac BC, Kim HJ, DelRio FW, Chung KH. Operational and environmental conditions regulate the frictional behavior of two-dimensional materials. APPLIED SURFACE SCIENCE 2019; 483:10.1016/j.apsusc.2019.03.249. [PMID: 31555019 PMCID: PMC6759862 DOI: 10.1016/j.apsusc.2019.03.249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The friction characteristics of single-layer h-BN, MoS2, and graphene were systematically investigated via friction force microscopy measurements at various operational (e.g., normal force and sliding speed) and environmental (e.g., relative humidity and thermal annealing) conditions. The low friction characteristics of these single-layer materials were clearly observed from the normal force-dependent friction results, and their interfacial shear strengths were further estimated using a Hertz-plus-offset model. In addition, speed-dependent friction characteristics clearly demonstrated two regimes of friction as a function of sliding speed - the first is the logarithmic increase in friction with sliding speed regime at sliding speeds smaller than the critical speed and the second is the friction plateau regime at sliding speeds greater than the critical speed. Fundamental parameters such as effective shape of the interaction potential and its corrugation amplitude for these single-layer materials were characterized using the thermally-activated Prandtl-Tomlinson model. Moreover, friction of single-layer h-BN, MoS2, and graphene was found to increase with relative humidity and decrease with thermal annealing; these trends were attributed to the diffusion of water molecules to the interface between the single-layer materials and their substrates, which leads to an increase in the puckering effect at the tip-material interface and interaction potential corrugation. The enhanced puckering effect was verified via molecular dynamics simulations. Overall, the findings enable a comprehensive understanding of friction characteristics for several classes of two-dimensional materials, which is important to elucidate the feasibility of using these materials as protective and solid-lubricant coating layers for nanoscale devices.
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Affiliation(s)
- Bien-Cuong Tran-Khac
- School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Hyun-Joon Kim
- Department of Precision Mechanical Engineering, Kyungpook National University, Sangju 37224, Republic of Korea
| | - Frank W. DelRio
- Applied Chemicals and Materials Division, Material Measurement Laboratory, National Institute of Standards and Technology, Boulder, CO 80305, USA
| | - Koo-Hyun Chung
- School of Mechanical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
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12
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Abbaspour M, Valizadeh Z, Jorabchi MN. Nucleation, coalescence, thermal evolution, and statistical probability of formation of Au/Ir/Pd nanoalloys in gas-phase condensation process. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.10.152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Liu Y, Song A, Xu Z, Zong R, Zhang J, Yang W, Wang R, Hu Y, Luo J, Ma T. Interlayer Friction and Superlubricity in Single-Crystalline Contact Enabled by Two-Dimensional Flake-Wrapped Atomic Force Microscope Tips. ACS NANO 2018; 12:7638-7646. [PMID: 30060665 DOI: 10.1021/acsnano.7b09083] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Interlayer friction between the atomic planes of 2D materials and heterostructures is a promising probe of the physics in their interlayer couplings and superlubricity. However, it is still challenging to measure the interlayer friction between well-defined 2D layers. We propose an approach of thermally assisted mechanical exfoliation and transfer to fabricate various 2D flake-wrapped atomic force microscopy (AFM) tips and to directly measure the interlayer friction between 2D flakes in single-crystalline contact. First, superlubricity between different 2D flakes and layered bulk materials is achieved with a friction coefficient as low as 10-4. The rotation angle dependence of superlubricity is observed for friction between graphite layers, whereas it is not observed between graphite and h-BN because of the incommensurate contact of the mismatched lattices. Second, the interlayer lateral force map between ReS2 layers is measured with atomic resolution, showing hexagonal patterns, as further verified by theoretical simulations. The tribological system constructed here offers an experimental platform to study interlayer couplings and friction between 2D flakes and layered bulk materials.
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Affiliation(s)
- Yanmin Liu
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Aisheng Song
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Zhi Xu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , People's Republic of China
| | - Ruilong Zong
- National Center of Electron Spectroscopy in Beijing , Beijing 100084 , People's Republic of China
| | - Jie Zhang
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Wenyan Yang
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Rong Wang
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Yuanzhong Hu
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - Jianbin Luo
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
| | - TianBao Ma
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084 , People's Republic of China
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14
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Akbarzadeh H, Abbaspour M, Mehrjouei E, Ramezanzadeh S. Pt-Co nanocluster in hollow carbon nanospheres. J Comput Chem 2018; 39:1267-1274. [DOI: 10.1002/jcc.25191] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/09/2018] [Accepted: 01/28/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry, Faculty of Basic Sciences; Hakim Sabzevari University; Sabzevar 96179-76487 Iran
| | - Mohsen Abbaspour
- Department of Chemistry, Faculty of Basic Sciences; Hakim Sabzevari University; Sabzevar 96179-76487 Iran
| | - Esmat Mehrjouei
- Department of Chemistry, Faculty of Basic Sciences; Hakim Sabzevari University; Sabzevar 96179-76487 Iran
| | - Samira Ramezanzadeh
- Department of Chemistry, Faculty of Basic Sciences; Hakim Sabzevari University; Sabzevar 96179-76487 Iran
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15
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Akbarzadeh H, Shamkhali AN, Mehrjouei E. Ag-Au bimetallic nanoclusters formed from a homogeneous gas phase: a new thermodynamic expression confirmed by molecular dynamics simulation. Phys Chem Chem Phys 2018; 19:3763-3769. [PMID: 28098288 DOI: 10.1039/c6cp08508c] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this work, two probabilistic and thermodynamic limits for formation of a bimetallic nanocluster from a homogeneous gas phase were obtained in order to investigate the related phenomena using molecular dynamics simulation. Therefore, by application of some simple assumptions from thermodynamics and statistical mechanics, a new expression for composition of the nanocluster was derived which depends only on the initial conditions of the system and one adjustable parameter. This expression can be easily fitted to the results of molecular dynamics and can be used as a measure of the thermodynamic contribution in the cluster formation process. Then, molecular dynamics simulations were performed for several systems containing the same total number of metallic atoms and different concentrations of Ag and Au atoms. The results of this study exhibited that depending on different initial compositions of Ag and Au types, fcc and icosahedral structures are formed. Moreover, increase of the initial Ag concentration leads to products whose compositions are more controlled by probability limits. However, longer simulation times indicated that creation of more thermodynamically favoured nanoclusters depends on the formation of more probable ones in the early stages of the simulation.
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Affiliation(s)
- H Akbarzadeh
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
| | - A N Shamkhali
- Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, 56199-11367 Ardabil, Iran.
| | - E Mehrjouei
- Department of Chemistry, Faculty of Basic Sciences, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran.
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16
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Martín EI, Sánchez-Coronilla A, Navas J, Gómez-Villarejo R, Martínez-Merino P, Alcántara R, Fernández-Lorenzo C. Revealing at the molecular level the role of the surfactant in the enhancement of the thermal properties of the gold nanofluid system used for concentrating solar power. Phys Chem Chem Phys 2018; 20:2421-2430. [DOI: 10.1039/c7cp05384c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A surfactant acts as a kind of net around gold that enhances at the molecular level the gold nanofluid thermal properties.
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Affiliation(s)
- Elisa I. Martín
- Departamento de Ingeniería Química
- Facultad de Química
- Universidad de Sevilla
- E-41012 Sevilla
- Spain
| | | | - Javier Navas
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- E-11510 Puerto Real (Cádiz)
- Spain
| | - Roberto Gómez-Villarejo
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- E-11510 Puerto Real (Cádiz)
- Spain
| | - Paloma Martínez-Merino
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- E-11510 Puerto Real (Cádiz)
- Spain
| | - Rodrigo Alcántara
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- E-11510 Puerto Real (Cádiz)
- Spain
| | - Concha Fernández-Lorenzo
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- E-11510 Puerto Real (Cádiz)
- Spain
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17
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Akbarzadeh H, Abbaspour M, Mehrjouei E, Ramezanzadeh S. Ag–Au nanoparticles encapsulated inside porous hollow carbon nanospheres: a molecular dynamics study. NEW J CHEM 2018. [DOI: 10.1039/c8nj01857j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have simulated bare Ag/Au nanoclusters and Ag/Au nanoclusters encapsulated into hollow carbon spheres (AgAu@C) with various structures (core–shell, hollow core–shell, rattle core–shell, and alloy nanoclusters) from 300 to 700 K.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Esmat Mehrjouei
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Samira Ramezanzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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18
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Abbaspour M, Akbarzadeh H, Valizadeh Z. Au–Ir nanoalloy nucleation during the gas-phase condensation: a comprehensive MD study including different effects. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00177d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The number of formed clusters and their size increases with the increasing temperature and pressure, which is in good agreement with the experimental results.
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Affiliation(s)
- Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Zahra Valizadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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19
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Coalescence process of gold/silver core-shell nanoparticles located on carbon nanotube and graphene surfaces. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Akbarzadeh H, Abbaspour M, Mehrjouei E, Masoumi A. Structural evolution of Pt/Pd nanoparticles in condensation process. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.132] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Dabaghmanesh S, Neek-Amal M, Partoens B, Neyts EC. The formation of Cr2O3 nanoclusters over graphene sheet and carbon nanotubes. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.09.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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de Aquino BRH, Neek-Amal M, Milošević MV. Unconventional two-dimensional vibrations of a decorated carbon nanotube under electric field: linking actuation to advanced sensing ability. Sci Rep 2017; 7:13481. [PMID: 29044124 PMCID: PMC5647406 DOI: 10.1038/s41598-017-12647-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 09/13/2017] [Indexed: 11/08/2022] Open
Abstract
We show that a carbon nanotube decorated with different types of charged metallic nanoparticles exhibits unusual two-dimensional vibrations when actuated by applied electric field. Such vibrations and diverse possible trajectories are not only fundamentally important but also have minimum two characteristic frequencies that can be directly linked back to the properties of the constituents in the considered nanoresonator. Namely, those frequencies and the maximal deflection during vibrations are very distinctively dependent on the geometry of the nanotube, the shape, element, mass and charge of the nanoparticle, and are vastly tunable by the applied electric field, revealing the unique sensing ability of devices made of molecular filaments and metallic nanoparticles.
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Affiliation(s)
- Belisa R H de Aquino
- Department of Physics, Universiteit Antwerpen, Groenenborgerlaan, 171, B-2020, Antwerpen, Belgium
| | - Mehdi Neek-Amal
- Department of Physics, Shahid Rajaee Teacher Training University, Lavizan, 16875-163, Tehran, Iran.
| | - Milorad V Milošević
- Department of Physics, Universiteit Antwerpen, Groenenborgerlaan, 171, B-2020, Antwerpen, Belgium.
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23
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24
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Akbarzadeh H, Taherkhani F, Mehrjouei E, Masoumi A. Kinetics formation of bimetallic nanoalloys at different simulation times. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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25
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Akbarzadeh H, Shamkhali AN, Abbaspour M, Salemi S, Attaran Z. A comprehensive molecular dynamics investigation on confinement of Pt Cu nanocluster inside carbon nanotubes. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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26
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Size and temperature dependency on structure, heat capacity and phonon density of state for colloidal silver nanoparticle in 1-Ethyl-3-methylimidazolium Hexafluorophosphate ionic liquid. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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27
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Melting Properties and Structural Evolution of (Agx-Pd1x)256 Bimetallic Nanoclusters Supported on SWCNT: A Molecular Dynamics Simulation. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Kumar S. Effect of applied force and atomic organization of copper on its adhesion to a graphene substrate. RSC Adv 2017. [DOI: 10.1039/c7ra01873h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Copper/graphene composites are lightweight and possess many attractive properties such as improved mechanical, electrical, and thermal properties.
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Affiliation(s)
- Sunil Kumar
- Metal Extraction and Forming Division
- CSIR
- -National Metallurgical Laboratory
- Jamshedpur
- 831007 India
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29
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Lodge MS, Tang C, Blue BT, Hubbard WA, Martini A, Dawson BD, Ishigami M. Lubricity of gold nanocrystals on graphene measured using quartz crystal microbalance. Sci Rep 2016; 6:31837. [PMID: 27554595 PMCID: PMC4995488 DOI: 10.1038/srep31837] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 07/27/2016] [Indexed: 12/31/2022] Open
Abstract
In order to test recently predicted ballistic nanofriction (ultra-low drag and enhanced lubricity) of gold nanocrystals on graphite at high surface speeds, we use the quartz microbalance technique to measure the impact of deposition of gold nanocrystals on graphene. We analyze our measurements of changes in frequency and dissipation induced by nanocrystals using a framework developed for friction of adatoms on various surfaces. We find the lubricity of gold nanocrystals on graphene to be even higher than that predicted for the ballistic nanofriction, confirming the enhanced lubricity predicted at high surface speeds. Our complementary molecular dynamics simulations indicate that such high lubricity is due to the interaction strength between gold nanocrystals and graphene being lower than previously assumed for gold nanocrystals and graphite.
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Affiliation(s)
- M S Lodge
- Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
| | - C Tang
- School of Engineering, University of California Merced, Merced, CA 95343, USA
| | - B T Blue
- Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
| | - W A Hubbard
- Department of Physics and California NanoSystems Institute, University of California, Los Angeles, California 90095, USA
| | - A Martini
- School of Engineering, University of California Merced, Merced, CA 95343, USA
| | - B D Dawson
- Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
| | - M Ishigami
- Department of Physics and NanoScience Technology Center, University of Central Florida, Orlando, FL 32816, USA
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30
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Akbarzadeh H, Abbaspour M. Investigation of melting and freezing of Ag–Au alloy nanoclusters supported on carbon nanotube using molecular dynamics simulations. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.02.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Akbarzadeh H, Shamkhali AN, Taherkhani F. Adsorption of He–Ar binary mixture on the silver nanoclusters: A molecular dynamics investigation on the effects mole fraction of mixture, shape and size of the nanocluster. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.01.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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32
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Ozmaian M, Fathizadeh A, Jalalvand M, Ejtehadi MR, Allaei SMV. Diffusion and self-assembly of C60 molecules on monolayer graphyne sheets. Sci Rep 2016; 6:21910. [PMID: 26912386 PMCID: PMC4766508 DOI: 10.1038/srep21910] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 01/27/2016] [Indexed: 12/15/2022] Open
Abstract
The motion of a fullerene (C60) on 5 different types of graphyne is studied by all-atom molecular dynamics simulations and compared with former studies on the motion of C60 on graphene. The motion shows a diffusive behavior which consists of either a continuous motion or discrete movements between trapping sites depending on the type of the graphyne sheet. For graphyne-4 and graphyne-5, fullerenes could detach from the surface of the graphyne sheet at room temperature which was not reported for similar cases on graphene sheets. Collective motion of a group of fullerenes interacting with a graphyne studied and it is shown that fullerenes exhibit stable assemblies. Depending on the type of graphyne, these assemblies can have either single or double layers. The mobility of the assembled structures is also dependent on the type of the graphyne sheet. The observed properties of the motion suggests novel applications for the complexes of fullerene and monolayer graphynes.
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Affiliation(s)
- Masoumeh Ozmaian
- Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran
| | - Arman Fathizadeh
- School of physics, Institute for research in fundamental sciences (IPM), Tehran, Iran
| | | | - Mohammad Reza Ejtehadi
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran.,Center of Excellence in Complex Systems and Condensed Matter (CSCM), Sharif University of Technology, Tehran 1458889694, Iran
| | - S Mehdi Vaez Allaei
- Department of physics, University of Tehran, Tehran 14395-547, Iran.,School of physics, Institute for research in fundamental sciences (IPM), Tehran, Iran
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33
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Akbarzadeh H, Abbaspour M, Salemi S. Carbon monoxide adsorption on the single-walled carbon nanotube supported gold–silver nanoalloys. NEW J CHEM 2016. [DOI: 10.1039/c5nj01382h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The carbon nanotube diameter and chirality have significant influences on CO adsorption.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Sirous Salemi
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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34
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Akbarzadeh H, Shamkhali AN, Abbaspour M, Salemi S, Attaran Z. A molecular dynamics study of the effect of the substrate on the thermodynamic properties of bound Pt–Cu bimetallic nanoclusters. Phys Chem Chem Phys 2016; 18:21730-6. [DOI: 10.1039/c6cp04522g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In this work confinement of the Pt708Cu707 bimetallic nanocluster in single-walled carbon, boron nitride, and silicon carbide nanotubes was investigated using molecular dynamics simulation.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Amir Nasser Shamkhali
- Department of Chemistry
- Faculty of Basic Sciences
- University of Mohaghegh Ardabili
- 56199-11367 Ardabil
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Sirous Salemi
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Zeinab Attaran
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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35
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Akbarzadeh H, Abbaspour M, Khomarian E. Propene adsorption on gold–palladium nanoalloys supported on bundle nanotubes. RSC Adv 2016. [DOI: 10.1039/c6ra12350c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Propene adsorption on (Pd–Au)N nanoalloys supported on carbon nanotube (CNT) bundles has been investigated using molecular dynamics (MD) simulations at 300 K.
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Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Mohsen Abbaspour
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
| | - Elham Khomarian
- Department of Chemistry
- Faculty of Basic Sciences
- Hakim Sabzevari University
- 96179-76487 Sabzevar
- Iran
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36
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Akbarzadeh H, Abbaspour M, Salemi S, Dastoorani M. Investigation of Thermodynamic, Dynamic, and Structural Properties of H2Adsorption on a Ag-Au Nanoalloy with a Carbon Nanotube Support. Chemphyschem 2015; 16:1676-82. [DOI: 10.1002/cphc.201500055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Indexed: 11/07/2022]
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37
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Akbarzadeh H, Shamkhali AN. H2adsorption on Ag-nanocluster/single-walled carbon nanotube composites: A molecular dynamics study on the effects of nanocluster size, diameter, and chirality of nanotube. J Comput Chem 2015; 36:433-40. [DOI: 10.1002/jcc.23817] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Accepted: 12/05/2014] [Indexed: 01/22/2023]
Affiliation(s)
- Hamed Akbarzadeh
- Department of Chemistry; Faculty of Basic Sciences; Hakim Sabzevari University; 96179-76487 Sabzevar Iran
| | - Amir Nasser Shamkhali
- Department of Chemistry; Faculty of Basic Sciences; University of Mohaghegh Ardabili; 56199-11367 Ardabil Iran
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38
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Yong Y, Hao X, Li C, Li X, Li T, Cui H, Lv S. Density functional studies of small silicon clusters adsorbed on graphene. RSC Adv 2015. [DOI: 10.1039/c5ra02081f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The structural and electronic properties of small Sin clusters (n = 1–6, 10) adsorbed on graphene are studied by use of density functional theory within periodic boundary conditions.
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Affiliation(s)
- Yongliang Yong
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
- Department of Physics
| | - Xiping Hao
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
| | - Chao Li
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
| | - Xiaohong Li
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
| | - Tongwei Li
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
| | - Hongling Cui
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
| | - Shijie Lv
- College of Physics and Engineering
- Henan University of Science and Technology
- Luoyang 471003
- People's Republic of China
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39
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Akbarzadeh H, Abbaspour M, Salemi S, Abroodi M. Investigation of thermal evolution of copper nanoclusters encapsulated in carbon nanotubes: a molecular dynamics study. Phys Chem Chem Phys 2015; 17:12747-59. [DOI: 10.1039/c5cp01294e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We have simulated the heating and cooling processes of CuN nanoclusters encapsulated in CNTs with different diameters and chiralities.
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Affiliation(s)
| | | | - Sirous Salemi
- Department of Chemistry
- Hakim Sabzevari University
- Sabzevar
- Iran
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40
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Shamkhali AN, Akbarzadeh H. A molecular dynamics investigation of hydrogen adsorption on Ag–Cu bimetallic nanoclusters supported on a bundle of single-walled carbon nanotubes. RSC Adv 2014. [DOI: 10.1039/c4ra10932e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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41
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Peng Q, Dearden AK, Crean J, Han L, Liu S, Wen X, De S. New materials graphyne, graphdiyne, graphone, and graphane: review of properties, synthesis, and application in nanotechnology. Nanotechnol Sci Appl 2014; 7:1-29. [PMID: 24808721 PMCID: PMC3998860 DOI: 10.2147/nsa.s40324] [Citation(s) in RCA: 196] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Plenty of new two-dimensional materials including graphyne, graphdiyne, graphone, and graphane have been proposed and unveiled after the discovery of the “wonder material” graphene. Graphyne and graphdiyne are two-dimensional carbon allotropes of graphene with honeycomb structures. Graphone and graphane are hydrogenated derivatives of graphene. The advanced and unique properties of these new materials make them highly promising for applications in next generation nanoelectronics. Here, we briefly review their properties, including structural, mechanical, physical, and chemical properties, as well as their synthesis and applications in nanotechnology. Graphyne is better than graphene in directional electronic properties and charge carriers. With a band gap and magnetism, graphone and graphane show important applications in nanoelectronics and spintronics. Because these materials are close to graphene and will play important roles in carbon-based electronic devices, they deserve further, careful, and thorough studies for nanotechnology applications.
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Affiliation(s)
- Qing Peng
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Albert K Dearden
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Jared Crean
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Liang Han
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
| | - Sheng Liu
- Institute for Microsystems, School of Mechanical Engineering, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Xiaodong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China ; Synfuels China Co, Ltd, Huairou, Beijing, People's Republic of China
| | - Suvranu De
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA
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42
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Xu P, Dong L, Neek-Amal M, Ackerman ML, Yu J, Barber SD, Schoelz JK, Qi D, Xu F, Thibado PM, Peeters FM. Self-organized platinum nanoparticles on freestanding graphene. ACS NANO 2014; 8:2697-2703. [PMID: 24499285 DOI: 10.1021/nn406394f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Freestanding graphene membranes were successfully functionalized with platinum nanoparticles (Pt NPs). High-resolution transmission electron microscopy revealed a homogeneous distribution of single-crystal Pt NPs that tend to exhibit a preferred orientation. Unexpectedly, the NPs were also found to be partially exposed to the vacuum with the top Pt surface raised above the graphene substrate, as deduced from atomic-scale scanning tunneling microscopy images and detailed molecular dynamics simulations. Local strain accumulation during the growth process is thought to be the origin of the NP self-organization. These findings are expected to shape future approaches in developing Pt NP catalysts for fuel cells as well as NP-functionalized graphene-based high-performance electronics.
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Affiliation(s)
- Peng Xu
- Department of Physics, University of Arkansas , Fayetteville, Arkansas 72701, United States
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43
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Molecular dynamics simulations of silver nanocluster supported on carbon nanotube. J Colloid Interface Sci 2014; 418:178-84. [DOI: 10.1016/j.jcis.2013.12.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/30/2013] [Accepted: 12/03/2013] [Indexed: 11/22/2022]
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44
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Paulus GLC, Wang QH, Ulissi ZW, McNicholas TP, Vijayaraghavan A, Shih CJ, Jin Z, Strano MS. Charge transfer at junctions of a single layer of graphene and a metallic single walled carbon nanotube. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:1954-63. [PMID: 23281165 DOI: 10.1002/smll.201201034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 08/27/2012] [Indexed: 05/08/2023]
Abstract
Junctions between a single walled carbon nanotube (SWNT) and a monolayer of graphene are fabricated and studied for the first time. A single layer graphene (SLG) sheet grown by chemical vapor deposition (CVD) is transferred onto a SiO₂/Si wafer with aligned CVD-grown SWNTs. Raman spectroscopy is used to identify metallic-SWNT/SLG junctions, and a method for spectroscopic deconvolution of the overlapping G peaks of the SWNT and the SLG is reported, making use of the polarization dependence of the SWNT. A comparison of the Raman peak positions and intensities of the individual SWNT and graphene to those of the SWNT-graphene junction indicates an electron transfer of 1.12 × 10¹³ cm⁻² from the SWNT to the graphene. This direction of charge transfer is in agreement with the work functions of the SWNT and graphene. The compression of the SWNT by the graphene increases the broadening of the radial breathing mode (RBM) peak from 3.6 ± 0.3 to 4.6 ± 0.5 cm⁻¹ and of the G peak from 13 ± 1 to 18 ± 1 cm⁻¹, in reasonable agreement with molecular dynamics simulations. However, the RBM and G peak position shifts are primarily due to charge transfer with minimal contributions from strain. With this method, the ability to dope graphene with nanometer resolution is demonstrated.
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Affiliation(s)
- Geraldine L C Paulus
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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45
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Shang H, Wang W. Hypervelocity impact properties of graphene armor via molecular dynamics simulations. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20122604027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Kim HJ, Kim DE. Molecular dynamics simulation of atomic-scale frictional behavior of corrugated nano-structured surfaces. NANOSCALE 2012; 4:3937-3944. [PMID: 22628124 DOI: 10.1039/c2nr30691c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Surface morphology is one of the critical parameters that affect the frictional behavior of two contacting bodies in relative motion. It is important because the real contact area as well as the contact stiffness is dictated by the micro- and nano-scale geometry of the surface. In this regard, the frictional behavior may be controlled by varying the surface morphology through nano-structuring. In this study, molecular dynamics simulations were conducted to investigate the effects of contact area and structural stiffness of corrugated nano-structures on the fundamental frictional behavior at the atomic-scale. The nano-structured surface was modeled as an array of corrugated carbon atoms with a given periodicity. It was found that the friction coefficient of the nano-structured surface was lower than that of a smooth surface under specific contact conditions. The effect of applied load on the friction coefficient was dependent on the size of the corrugation. Furthermore, stiffness of the nano-structure was identified to be an important variable in dictating the frictional behavior.
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Affiliation(s)
- Hyun-Joon Kim
- Department of Mechanical Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul, South Korea
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47
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Ramasse QM, Zan R, Bangert U, Boukhvalov DW, Son YW, Novoselov KS. Direct experimental evidence of metal-mediated etching of suspended graphene. ACS NANO 2012; 6:4063-4071. [PMID: 22533553 DOI: 10.1021/nn300452y] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Atomic resolution high angle annular dark field imaging of suspended, single-layer graphene, onto which the metals Cr, Ti, Pd, Ni, Al, and Au atoms had been deposited, was carried out in an aberration-corrected scanning transmission electron microscope. In combination with electron energy loss spectroscopy, employed to identify individual impurity atoms, it was shown that nanoscale holes were etched into graphene, initiated at sites where single atoms of all the metal species except for gold come into close contact with the graphene. The e-beam scanning process is instrumental in promoting metal atoms from clusters formed during the original metal deposition process onto the clean graphene surface, where they initiate the hole-forming process. Our observations are discussed in the light of calculations in the literature, predicting a much lowered vacancy formation in graphene when metal ad-atoms are present. The requirement and importance of oxygen atoms in this process, although not predicted by such previous calculations, is also discussed, following our observations of hole formation in pristine graphene in the presence of Si-impurity atoms, supported by new calculations which predict a dramatic decrease of the vacancy formation energy, when SiO(x) molecules are present.
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Affiliation(s)
- Quentin M Ramasse
- SuperSTEM Laboratory, STFC Daresbury Campus , Daresbury WA4 4AD, United Kingdom.
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48
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Neek-Amal M, Abedpour N, Rasuli SN, Naji A, Ejtehadi MR. Diffusive motion of C60 on a graphene sheet. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 82:051605. [PMID: 21230486 DOI: 10.1103/physreve.82.051605] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 08/11/2010] [Indexed: 05/30/2023]
Abstract
The motion of a C60 molecule over a graphene sheet at finite temperature is investigated both theoretically and computationally. We show that a graphene sheet generates a van der Waals laterally periodic potential, which directly influences the motion of external objects in its proximity. The translational motion of a C60 molecule near a graphene sheet is found to be diffusive in the lateral directions, while in the perpendicular direction, the motion may be described as diffusion in an effective harmonic potential which is determined from the distribution function of the position of the C60 molecule. We also examine the rotational diffusion of C60 and show that its motion over the graphene sheet is not a rolling motion.
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Affiliation(s)
- M Neek-Amal
- Department of Physics, Shahid Rajaee Teacher Training University, Lavizan, PO Box 16785-136, Tehran, Iran.
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