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Barboza APM, Matos MJS, Chacham H, Batista RJC, de Oliveira AB, Mazzoni MSC, Neves BRA. Compression-Induced Modification of Boron Nitride Layers: A Conductive Two-Dimensional BN Compound. ACS NANO 2018; 12:5866-5872. [PMID: 29787237 DOI: 10.1021/acsnano.8b01911] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The ability to create materials with improved properties upon transformation processes applied to conventional materials is the keystone of materials science. Here, hexagonal boron nitride (h-BN), a large-band-gap insulator, is transformed into a conductive two-dimensional (2D) material- bonitrol-that is stable at ambient conditions. The process, which requires compression of at least two h-BN layers and hydroxyl ions, is characterized via scanning probe microscopy experiments and ab initio calculations. This material and its creation mechanism represent an additional strategy for the transformation of known 2D materials into artificial advanced materials with exceptional properties.
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Affiliation(s)
- Ana P M Barboza
- Departamento de Física , Universidade Federal de Ouro Preto , 35400-000 , Ouro Preto , MG , Brazil
| | - Matheus J S Matos
- Departamento de Física , Universidade Federal de Ouro Preto , 35400-000 , Ouro Preto , MG , Brazil
| | - Helio Chacham
- Departamento de Física , Universidade Federal de Minas Gerais , CP 702, 31270-901 , Belo Horizonte , MG , Brazil
| | - Ronaldo J C Batista
- Departamento de Física , Universidade Federal de Ouro Preto , 35400-000 , Ouro Preto , MG , Brazil
| | - Alan B de Oliveira
- Departamento de Física , Universidade Federal de Ouro Preto , 35400-000 , Ouro Preto , MG , Brazil
| | - Mario S C Mazzoni
- Departamento de Física , Universidade Federal de Minas Gerais , CP 702, 31270-901 , Belo Horizonte , MG , Brazil
| | - Bernardo R A Neves
- Departamento de Física , Universidade Federal de Minas Gerais , CP 702, 31270-901 , Belo Horizonte , MG , Brazil
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2
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Sims CM, Hanna SK, Heller DA, Horoszko CP, Johnson ME, Montoro Bustos AR, Reipa V, Riley KR, Nelson BC. Redox-active nanomaterials for nanomedicine applications. NANOSCALE 2017; 9:15226-15251. [PMID: 28991962 PMCID: PMC5648636 DOI: 10.1039/c7nr05429g] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Nanomedicine utilizes the remarkable properties of nanomaterials for the diagnosis, treatment, and prevention of disease. Many of these nanomaterials have been shown to have robust antioxidative properties, potentially functioning as strong scavengers of reactive oxygen species. Conversely, several nanomaterials have also been shown to promote the generation of reactive oxygen species, which may precipitate the onset of oxidative stress, a state that is thought to contribute to the development of a variety of adverse conditions. As such, the impacts of nanomaterials on biological entities are often associated with and influenced by their specific redox properties. In this review, we overview several classes of nanomaterials that have been or projected to be used across a wide range of biomedical applications, with discussion focusing on their unique redox properties. Nanomaterials examined include iron, cerium, and titanium metal oxide nanoparticles, gold, silver, and selenium nanoparticles, and various nanoscale carbon allotropes such as graphene, carbon nanotubes, fullerenes, and their derivatives/variations. Principal topics of discussion include the chemical mechanisms by which the nanomaterials directly interact with biological entities and the biological cascades that are thus indirectly impacted. Selected case studies highlighting the redox properties of nanomaterials and how they affect biological responses are used to exemplify the biologically-relevant redox mechanisms for each of the described nanomaterials.
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Affiliation(s)
- Christopher M. Sims
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
| | - Shannon K. Hanna
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
| | - Daniel A. Heller
- Memorial Sloan Kettering Cancer Center (MSKCC), 1275 York Avenue, New York, NY 10065, United States
- Weill Cornell Medicine, Cornell University, 1300 York Avenue, New York, NY 10065, United States
| | - Christopher P. Horoszko
- Memorial Sloan Kettering Cancer Center (MSKCC), 1275 York Avenue, New York, NY 10065, United States
- Weill Graduate School of Medical Sciences, Cornell University, 1300 York Avenue, New York, NY 10065, United States
| | - Monique E. Johnson
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
| | - Antonio R. Montoro Bustos
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
| | - Vytas Reipa
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
| | - Kathryn R. Riley
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Avenue, Swarthmore, PA 19081, United States
| | - Bryant C. Nelson
- Material Measurement Laboratory, National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD 20899, United States
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Roy A, Amin KR, Tripathi S, Biswas S, Singh AK, Bid A, Ravishankar N. Manipulation of Optoelectronic Properties and Band Structure Engineering of Ultrathin Te Nanowires by Chemical Adsorption. ACS APPLIED MATERIALS & INTERFACES 2017; 9:19462-19469. [PMID: 28084716 DOI: 10.1021/acsami.6b12064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Band structure engineering is a powerful technique both for the design of new semiconductor materials and for imparting new functionalities to existing ones. In this article, we present a novel and versatile technique to achieve this by surface adsorption on low dimensional systems. As a specific example, we demonstrate, through detailed experiments and ab initio simulations, the controlled modification of band structure in ultrathin Te nanowires due to NO2 adsorption. Measurements of the temperature dependence of resistivity of single ultrathin Te nanowire field-effect transistor (FET) devices exposed to increasing amounts of NO2 reveal a gradual transition from a semiconducting to a metallic state. Gradual quenching of vibrational Raman modes of Te with increasing concentration of NO2 supports the appearance of a metallic state in NO2 adsorbed Te. Ab initio simulations attribute these observations to the appearance of midgap states in NO2 adsorbed Te nanowires. Our results provide fundamental insights into the effects of ambient on the electronic structures of low-dimensional materials and can be exploited for designing novel chemical sensors.
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Affiliation(s)
- Ahin Roy
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Kazi Rafsanjani Amin
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Shalini Tripathi
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Sangram Biswas
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Abhishek K Singh
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - Aveek Bid
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
| | - N Ravishankar
- Materials Research Centre and §Department of Physics, Indian Institute of Science , Bangalore 560012, India
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Araujo KAS, Barboza APM, Fernandes TFD, Shadmi N, Joselevich E, Mazzoni MSC, Neves BRA. Charge transfer between carbon nanotubes on surfaces. NANOSCALE 2015; 7:16175-16181. [PMID: 26381825 DOI: 10.1039/c5nr03547c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The charge transfer between neighboring single-walled carbon nanotubes (SWNTs) on a silicon oxide surface was investigated as a function of both the SWNT nature (metallic or semiconducting) and the anode/cathode distance using scanning probe techniques. Two main mechanisms were observed: a direct electron tunneling described by the typical Fowler-Nordheim model, and indirect electron transfer (hopping) mediated by functional groups on the supporting surface. Both mechanisms depend on the SWNT nature and on the anode/cathode separation: direct electron tunneling dominates the charge transfer process for metallic SWNTs, especially for large distances, while both mechanisms compete with each other for semiconducting SWNTs, prevailing one over the other depending on the anode/cathode separation. These mechanisms may significantly influence the design and operation of SWNT-based electronic devices.
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Affiliation(s)
- Karolline A S Araujo
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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Lovley DR, Malvankar NS. Seeing is believing: novel imaging techniques help clarify microbial nanowire structure and function. Environ Microbiol 2015; 17:2209-15. [PMID: 25384844 DOI: 10.1111/1462-2920.12708] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 10/26/2014] [Accepted: 11/06/2014] [Indexed: 11/30/2022]
Abstract
Novel imaging approaches have recently helped to clarify the properties of 'microbial nanowires'. Geobacter sulfurreducens pili are actual wires. They possess metallic-like conductivity, which can be attributed to overlapping pi-pi orbitals of key aromatic amino acids. Electrostatic force microscopy recently confirmed charge propagation along the pili, in a manner similar to carbon nanotubes. The pili are essential for long-range electron transport to insoluble electron acceptors and interspecies electron transfer. Previous claims that Shewanella oneidensis also produce conductive pili have recently been recanted, based on novel live-imaging studies. The putative pili are, in fact, long extensions of the cytochrome-rich outer membrane and periplasm that, when dried, collapse to form filaments with dimensions similar to pili. It has yet to be demonstrated whether the cytochrome-to-cytochrome electron hopping documented in the dried membrane extensions takes place in intact hydrated membrane extensions or whether the membrane extensions enhance electron transport to insoluble electron acceptors such as Fe(III) oxides or electrodes. These findings demonstrate that G. sulfurreducens conductive pili and the outer membrane extensions of S. oneidensis are fundamentally different in composition, mechanism of electron transport and physiological role. New methods for evaluating filament conductivity will facilitate screening the microbial world for nanowires and elucidating their function.
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Affiliation(s)
- Derek R Lovley
- Department of Microbiology, University of Massachusetts, Amherst, MA, USA
| | - Nikhil S Malvankar
- Department of Microbiology, University of Massachusetts, Amherst, MA, USA.,Department of Physics, University of Massachusetts, Amherst, MA, USA
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7
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Schäfer S, Wang Z, Rammelberg HU, Kipp T, Mews A. Tip-Induced Charging of Free Standing Semiconductor Nanowires and Carbon Nanotubes. Isr J Chem 2012. [DOI: 10.1002/ijch.201200049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Araujo PT, Barbosa Neto NM, Chacham H, Carara SS, Soares JS, Souza AD, Cançado LG, de Oliveira AB, Batista RJC, Joselevich E, Dresselhaus MS, Jorio A. In situ atomic force microscopy tip-induced deformations and Raman spectroscopy characterization of single-wall carbon nanotubes. NANO LETTERS 2012; 12:4110-4116. [PMID: 22731916 DOI: 10.1021/nl3016347] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this work, an atomic force microscope (AFM) is combined with a confocal Raman spectroscopy setup to follow in situ the evolution of the G-band feature of isolated single-wall carbon nanotubes (SWNTs) under transverse deformation. The SWNTs are pressed by a gold AFM tip against the substrate where they are sitting. From eight deformed SWNTs, five exhibit an overall decrease in the Raman signal intensity, while three exhibit vibrational changes related to the circumferential symmetry breaking. Our results reveal chirality dependent effects, which are averaged out in SWNT bundle measurements, including a previously elusive mode symmetry breaking that is here explored using molecular dynamics calculations.
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Affiliation(s)
- P T Araujo
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 30123-970 Brazil
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Zheng M, Zou LF, Wang H, Park C, Ke C. Engineering radial deformations in single-walled carbon and boron nitride nanotubes using ultrathin nanomembranes. ACS NANO 2012; 6:1814-1822. [PMID: 22280493 DOI: 10.1021/nn2048813] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Radial deformations of carbon and boron-nitride nanotubes are of great importance to their respective electronic properties and applications. In this paper, we present a simple and practical approach of engineering radial deformations in single-walled carbon and boron-nitride nanotubes (SWCNTs and SW-BNNTs) through covering individual nanotubes lying on flat substrates with subnanometer-thick monolayer graphene oxide (GO) nanomembranes. The GO membrane conforms to and transversely compresses the underlying nanotube as a result of its adhesion binding interaction with the substrate. Our atomic force microscopy (AFM) imaging measurements reveal that the engineered net radial deformations of both types of tubes increase with the tube diameter and are more for SW-BNNTs compared with SWCNTs of the same tube diameter. Our results capture the net cross-section height reductions of up to 44.1% for SW-BNNTs and up to 29.7% for SWCNTs. Our work clearly demonstrates the effectiveness of our proposed approach for engineering and controlling the radial deformation in one-dimensional tubular nanostructures and opens a promising route for mechanical tuning of their electronic properties for novel nanoelectronics applications.
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Affiliation(s)
- Meng Zheng
- Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, New York 13902, United States
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10
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Barboza APM, Carara SS, Batista RJC, Chacham H, Neves BRA. Controlling the electrical behavior of semiconducting carbon nanotubes via tube contact. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:220-224. [PMID: 22109840 DOI: 10.1002/smll.201101285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 08/17/2011] [Indexed: 05/31/2023]
Abstract
The electromechanical behavior of single-walled carbon nanotubes (SWNTs) in contact with different materials is investigated by scanning probe microscopy. An anomalous diamond/semiconducting nanotube behavior is observed, which is consistent with ab initio calculations: the formation of a broken-gap heterojunction between semiconducting SWNTs and a hydrogenated diamond surface results in a metallic response for such SWNTs.
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Affiliation(s)
- Ana Paula M Barboza
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais-UFMG, C.P. 702, 30123-970 Belo Horizonte, Brazil
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Abstract
Environmental effects are very important in nanoscience and nanotechnology. This work reviews the importance of the substrate in single-wall carbon nanotube properties. Contact with a substrate can modify the nanotube properties, and such interactions have been broadly studied as either a negative aspect or a solution for developing carbon nanotube-based nanotechnologies. This paper discusses both theoretical and experimental studies where the interaction between the carbon nanotubes and the substrate affects the structural, electronic, and vibrational properties of the tubes.
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12
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Buckling of Carbon Nanotubes: A State of the Art Review. MATERIALS 2011; 5:47-84. [PMID: 28817032 PMCID: PMC5448946 DOI: 10.3390/ma5010047] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 12/19/2011] [Accepted: 12/20/2011] [Indexed: 11/18/2022]
Abstract
The nonlinear mechanical response of carbon nanotubes, referred to as their “buckling" behavior, is a major topic in the nanotube research community. Buckling means a deformation process in which a large strain beyond a threshold causes an abrupt change in the strain energy vs. deformation profile. Thus far, much effort has been devoted to analysis of the buckling of nanotubes under various loading conditions: compression, bending, torsion, and their certain combinations. Such extensive studies have been motivated by (i) the structural resilience of nanotubes against buckling and (ii) the substantial influence of buckling on their physical properties. In this contribution, I review the dramatic progress in nanotube buckling research during the past few years.
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Balaji S, Debnath R. Internal stress induced metallization of single-walled carbon nanotubes in a nanotube/glass conducting composite. NANOTECHNOLOGY 2011; 22:415706. [PMID: 21926456 DOI: 10.1088/0957-4484/22/41/415706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Single-walled carbon nanotubes (SWCNTs) have been incorporated into a (Pb, Zn)-phosphate glass host by a melt-quenching technique. Studies of the optical and electronic properties show that the nanotubes in the composite have suffered conformational deformations and attained a band structure of quasimetallic type, making the composite a good electrical conductor. Possible strains in the nanotubes of the composite such as radial compression, torsion and bending have been considered and their role in modulating the band structures has been analyzed by judging the change in band gap energies (ΔE) of the deformed SWCNTs using an equation which is based on the π-electron tight binding model. The effect of σ*-π* hybridization due to the radial compression in generating the metallicity is also discussed. The carrier transport in the composite above room temperature has been shown to be dominated by fluctuation induced tunneling.
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Affiliation(s)
- Sathravada Balaji
- Central Glass and Ceramic Research Institute (CSIR), Jadavpur, Kolkata, India.
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Barboza APM, Guimaraes MHD, Massote DVP, Campos LC, Barbosa Neto NM, Cancado LG, Lacerda RG, Chacham H, Mazzoni MSC, Neves BRA. Room-temperature compression-induced diamondization of few-layer graphene. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:3014-3017. [PMID: 21594909 DOI: 10.1002/adma.201101061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Indexed: 05/30/2023]
Affiliation(s)
- Ana P M Barboza
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais-UFMG, Belo Horizonte, Brazil
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15
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Wu B, Geng D, Liu Y. Evaluation of metallic and semiconducting single-walled carbon nanotube characteristics. NANOSCALE 2011; 3:2074-2085. [PMID: 21387025 DOI: 10.1039/c0nr00958j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The nature of the mixed electronic type metallic (M-) and semiconducting (S-) single-walled carbon nanotubes (SWNTs) synthesized by current methods has posed a key challenge for the development of high performance SWNT-based electronic devices. The precise measurements of M- to S-SWNT ratio in as-grown or separated samples are of paramount importance for the controlled synthesis, separation and the realization of various applications. The objective of this review is to provide comprehensive overview of the progress achieved so far for measuring the M/S ratio both on individual and collective levels of SWNT states. We begin with a brief introduction of SWNT structures/properties and discussion of the problems and difficulties associated with precise measurement of the M/S ratio, and then introduce the principles for obtaining distinguished signals from M-and S-SWNTs. These techniques are classified into different groups based either on the single/ensemble detection of SWNT samples or on the principles of techniques themselves. We then present the M/S ratio evaluation results of these methods, with emphasis on scanning probe microscopy (SPM)-based detection techniques. Finally, the prospects of precise and large-scale measurement of M/S ratio in achieving controlled synthesis and understanding growth mechanism of SWNTs are discussed.
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Affiliation(s)
- Bin Wu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
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16
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Soares JS, Barboza APM, Araujo PT, Barbosa Neto NM, Nakabayashi D, Shadmi N, Yarden TS, Ismach A, Geblinger N, Joselevich E, Vilani C, Cançado LG, Novotny L, Dresselhaus G, Dresselhaus MS, Neves BRA, Mazzoni MSC, Jorio A. Modulating the electronic properties along carbon nanotubes via tube-substrate interaction. NANO LETTERS 2010; 10:5043-5048. [PMID: 21050011 DOI: 10.1021/nl103245q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We study single wall carbon nanotubes (SWNTs) deposited on quartz. Their Raman spectrum depends on the tube-substrate morphology, and in some cases, it shows that the same SWNT-on-quartz system exhibits a mixture of semiconductor and metal behavior, depending on the orientation between the tube and the substrate. We also address the problem using electric force microscopy and ab initio calculations, both showing that the electronic properties along a single SWNT are being modulated via tube-substrate interaction.
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Affiliation(s)
- Jaqueline S Soares
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
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17
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Chang T, Guo Z. Temperature-induced reversible dominoes in carbon nanotubes. NANO LETTERS 2010; 10:3490-3493. [PMID: 20681525 DOI: 10.1021/nl101623c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We show by molecular dynamics simulations that there exists a reversible domino process in single walled carbon nanotubes (SWCNTs). SWCNTs with one end collapsed and the other circular are chosen for demonstration. At a low temperature, the collapsed zone spreads over the whole tube, while at a higher temperature, the collapsed zone shrinks, and the circular zone extends along the tube. The reason for the reversible domino process is that the temperature modifies the stable state of the tube. The temperature-induced reversible domino process of SWCNTs provides opportunities for the design of nanoscale heat engines, rechargeable expelling devices, temperature-sensitive devices, mechanical oscillators, and pulse generators, etc.
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Affiliation(s)
- Tienchong Chang
- Shanghai Institute of Applied Mathematics and Mechanics, Institute of Low Dimensional Carbon and Device Physics, Shanghai University, Shanghai 200072, People's Republic of China.
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Mélin T, Zdrojek M, Brunel D. Electrostatic Force Microscopy and Kelvin Force Microscopy as a Probe of the Electrostatic and Electronic Properties of Carbon Nanotubes. SCANNING PROBE MICROSCOPY IN NANOSCIENCE AND NANOTECHNOLOGY 2010. [DOI: 10.1007/978-3-642-03535-7_4] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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19
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Silva-Pinto E, Gomes AP, Pinheiro CB, Ladeira LO, Pimenta MA, Neves BRA. Controlled growth and positioning of metal nanoparticles via scanning probe microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3356-3358. [PMID: 19708234 DOI: 10.1021/la900045f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A process enabling both the controlled growth and positioning of metal nanoparticles (NPs) is reported. Using scanning probe microscopy (SPM) techniques, metal NPs are directly grown in the region of interest via the reduction of metallic ions in a polymer matrix induced by a properly biased SPM tip. The metallic nature of these NPs is established via X-ray diffraction and surface-enhanced Raman spectroscopy experiments. Some initial applications of this process, such as the decoration of carbon nanotubes with metal NPs, are also briefly demonstrated and discussed.
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Affiliation(s)
- Elisangela Silva-Pinto
- Departamento de Física, Universidade Federal de Minas Gerais, UFMG, Ave. Antonio Carlos, 6627 Belo Horizonte, MG, Brazil
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Barboza APM, Chacham H, Neves BRA. Universal response of single-wall carbon nanotubes to radial compression. PHYSICAL REVIEW LETTERS 2009; 102:025501. [PMID: 19257288 DOI: 10.1103/physrevlett.102.025501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2008] [Indexed: 05/27/2023]
Abstract
The mechanical response of single-wall carbon nanotubes to radial compression is investigated via atomic force microscopy (AFM). We find that the force F applied by an AFM tip (with radius R) onto a nanotube (with diameter d), rescaled through the quantity Fd;{3/2}(2R);{-1/2}, falls into a universal curve as a function of the compressive strain. Such universality is reproduced analytically in a model where the graphene bending modulus is the only fitting parameter. The application of this model to the radial Young's modulus E_{r} leads to a further universal-type behavior which explains the large variations of nanotube E_{r} reported in the literature.
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Affiliation(s)
- A P M Barboza
- Departamento de Física, ICEX, Universidade Federal de Minas Gerais, CP 702, 30123-970, Belo Horizonte, MG, Brazil
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Electronic Structure of a Collapsed Armchair Single-Walled Carbon Nanotube. E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY 2009. [DOI: 10.1380/ejssnt.2009.541] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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