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Rodrigues GLC, de Oliveira TG, Gusmão SBS, Ferreira OP, Vasconcelos TL, Guerra Y, Milani R, Peña-Garcia R, Viana BC. Study of Structural and Optical Properties of Titanate Nanotubes with Erbium under Heat Treatment in Different Atmospheres. Materials (Basel) 2023; 16:1842. [PMID: 36902957 PMCID: PMC10004321 DOI: 10.3390/ma16051842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 01/27/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
Titanate nanotubes were synthesized and subjected to an ion exchange reaction with erbium salt aqueous solution to obtain titanate nanotubes exchanged with erbium (3+) ions. In order to evaluate the effects of the thermal treatment atmosphere on the structural and optical properties of erbium titanate nanotubes, we subjected them to heat treatment in air and argon atmospheres. For comparison, titanate nanotubes were also treated in the same conditions. A complete structural and optical characterizations of the samples was performed. The characterizations evidenced the preservation of the morphology with the presence of phases of erbium oxides decorating the surface of the nanotubes. Variations in the dimensions of the samples (diameter and interlamellar space) were promoted by the replacement of Na+ by Er3+ and the thermal treatment in different atmospheres. In addition, the optical properties were investigated by UV-Vis absorption spectroscopy and photoluminescence spectroscopy. The results revealed that the band gap of the samples depends on the variation of diameter and sodium content caused by ion exchange and thermal treatment. Furthermore, the luminescence strongly depended on vacancies, evidenced mainly by the calcined erbium titanate nanotubes in argon atmosphere. The presence of these vacancies was confirmed by the determination of Urbach energy. The results suggest the use of thermal treated erbium titanate nanotubes in argon atmosphere in optoelectronics and photonics applications, such as photoluminescent devices, displays, and lasers.
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Affiliation(s)
- Gelson L. C. Rodrigues
- Federal Institute of Piauí (IFPI), Parnaíba 64211-145, PI, Brazil
- Interdisciplinary Laboratory of Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
| | - Tainara G. de Oliveira
- Interdisciplinary Laboratory of Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
| | - Suziete B. S. Gusmão
- Interdisciplinary Laboratory of Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
| | - Odair P. Ferreira
- Department of Chemistry, State University of Londrina, Londrina 86050-482, PR, Brazil
| | - Thiago L. Vasconcelos
- National Institute of Metrology, Quality and Technology (Inmetro), Duque de Caxias 25250-02, RJ, Brazil
| | - Yuset Guerra
- Department of Physics, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
| | - Raquel Milani
- Department of Physics, Federal University of Pernambuco (UFPE), Recife 50670-901, PE, Brazil
| | - Ramón Peña-Garcia
- Interdisciplinary Laboratory of Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
- Academic Unit of Cabo de Santo Agostinho, Federal Rural University of Pernambuco (UFRPE), Cabo de Santo Agostinho 50670-901, PE, Brazil
| | - Bartolomeu C. Viana
- Interdisciplinary Laboratory of Advanced Materials (LIMAV), Materials Science and Engineering Graduate Program, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
- Department of Physics, Federal University of Piauí (UFPI), Teresina 64049-550, PI, Brazil
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Nazarkovsky M, Mikhraliieva A, Achete CA, Alves LA, Araujo J, Archanjo BS, de Barros JJF, Cardoso LMDF, Couceiro JNSS, Marques FD, Oliveira BS, de Souza RND, Teixeira AJ, Vasconcelos TL, Zaitsev V. Rational design of large flat nitrogen-doped graphene oxide quantum dots with green-luminescence suitable for biomedical applications. RSC Adv 2022; 12:14342-14355. [PMID: 35702221 PMCID: PMC9096629 DOI: 10.1039/d2ra01516a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 04/08/2022] [Indexed: 11/21/2022] Open
Abstract
Rational synthesis and simple methodology for the purification of large (35-45 nm in lateral size) and flat (1.0-1.5 nm of height) nitrogen-doped graphene oxide quantum dots (GOQDs) are presented. The methodology allows robust metal-free and acid-free preparation of N-GOQDs with a yield of about 100% and includes hydrothermal treatment of graphene oxide with hydrogen peroxide and ammonia. It was demonstrated that macroscopic impurities can be separated from N-GOQD suspension by their coagulation with 0.9% NaCl solution. Redispersible in water and saline solutions, particles of N-GOQDs were characterized using tip-enhanced Raman spectroscopy (TERS), photoluminescent, XPS, and UV-VIS spectroscopies. The size and morphology of N-GOQDs were studied by dynamic light scattering, AFM, SEM, and TEM. The procedure proposed allows nitrogen-doped GOQDs to be obtained, having 60-51% of carbon, 34-45% of oxygen, and up to 7.2% of nitrogen. The N-GOQD particles obtained in two hours of synthesis contain only pyrrolic defects of the graphene core. The fraction of pyridine moieties grows with the time of synthesis, while the fraction of quaternary nitrogen declines. Application of TERS allows demonstration that the N-GOQDs consist of a graphene core with an average crystallite size of 9 nm and an average distance between nearest defects smaller than 3 nm. The cytotoxicity tests reveal high viability of the monkey epithelial kidney cells Vero in the presence of N-GOQDs in a concentration below 60 mg L-1. The N-GOQDs demonstrate green luminescence with an emission maximum at 505 nm and sedimentation stability in the cell culture medium.
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Affiliation(s)
- Michael Nazarkovsky
- Department of Chemistry, Pontifical Catholic University of Rio de Janeiro Marques de Sao Vicente, 225 22451-900 Rio de Janeiro Brazil
| | - Albina Mikhraliieva
- Department of Chemistry, Pontifical Catholic University of Rio de Janeiro Marques de Sao Vicente, 225 22451-900 Rio de Janeiro Brazil
| | - Carlos A Achete
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Luiz Anastacio Alves
- Laboratory of Cellular Communication, Oswaldo Cruz Institute, Oswaldo Cruz Foundation 4365 Manguinhos Rio de Janeiro 21045-900 Brazil
| | - Joyce Araujo
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Bráulio S Archanjo
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | | | - Liana Monteiro da Fonseca Cardoso
- Laboratory of Cellular Communication, Oswaldo Cruz Institute, Oswaldo Cruz Foundation 4365 Manguinhos Rio de Janeiro 21045-900 Brazil
| | - José Nelson S S Couceiro
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941-902 Brazil
| | - Fernanda Davi Marques
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Bruno S Oliveira
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Rafael Nascimento Dias de Souza
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Ayla Josma Teixeira
- Laboratory of Cellular Communication, Oswaldo Cruz Institute, Oswaldo Cruz Foundation 4365 Manguinhos Rio de Janeiro 21045-900 Brazil
| | - Thiago L Vasconcelos
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Inmetro Av. Nossa Senhora das Graças, 50, Xerém Duque de Caxias 25250-020 Brazil
| | - Vladimir Zaitsev
- Department of Chemistry, Pontifical Catholic University of Rio de Janeiro Marques de Sao Vicente, 225 22451-900 Rio de Janeiro Brazil
- National University of Kyiv-Mohyla Academy 2 Skovorody Vul. Kyiv 04070 Ukraine
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3
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Tschannen CD, Frimmer M, Vasconcelos TL, Shi L, Pichler T, Novotny L. Tip-Enhanced Stokes-Anti-Stokes Scattering from Carbyne. Nano Lett 2022; 22:3260-3265. [PMID: 35417179 PMCID: PMC9052751 DOI: 10.1021/acs.nanolett.2c00154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 04/07/2022] [Indexed: 06/10/2023]
Abstract
Carbyne, a linear chain of carbon atoms, is the truly one-dimensional allotrope of carbon and the strongest known Raman scatterer. Here, we use tip-enhanced Raman scattering (TERS) to further enhance the Raman response of a single carbyne chain confined inside a double-walled carbon nanotube. We observe an increase of the anti-Stokes scattering by a factor of 3290 and a 22-fold enhancement of the anti-Stokes/Stokes ratio relative to far-field measurements. The power dependence of the anti-Stokes/Stokes ratio under TERS conditions is indicative of coherent Stokes-anti-Stokes scattering mediated by an excited phonon. The role of resonance effects and laser-induced heating are discussed and potential opportunities are outlined.
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Affiliation(s)
| | - Martin Frimmer
- Photonics
Laboratory, ETH Zürich, 8093 Zürich, Switzerland
| | - Thiago L. Vasconcelos
- Materials
Metrology Division, Instituto Nacional de
Metrologia Qualidade e Tecnologia (INMETRO), 25250-020 Duque
de Caxias, Rio de Janeiro, Brazil
| | - Lei Shi
- State
Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology
Research Center, Guangzhou Key Laboratory of Flexible Electronic Materials
and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P.R. China
| | - Thomas Pichler
- Faculty
of Physics, Universität Wien, 1090 Wien, Austria
| | - Lukas Novotny
- Photonics
Laboratory, ETH Zürich, 8093 Zürich, Switzerland
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4
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Affiliation(s)
| | - Thiago L. Vasconcelos
- Materials Metrology Division, Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO), 25250-020 Duque de Caxias, RJ, Brazil
| | - Lukas Novotny
- Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
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Gadelha AC, Vasconcelos TL, Cançado LG, Jorio A. Nano-optical Imaging of In-Plane Homojunctions in Graphene and MoS 2 van der Waals Heterostructures on Talc and SiO 2. J Phys Chem Lett 2021; 12:7625-7631. [PMID: 34351150 DOI: 10.1021/acs.jpclett.1c01804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Understanding the impact of doping variations on the physical properties of two-dimensional materials is important for their application in electronic and optoelectronic devices. Here we report a nano-optical study on graphene and MoS2 homojunctions by placing these two materials partly on top of a layered talc substrate, partly on top of an SiO2 substrate. By analyzing the nano-Raman scattering from graphene and the nanophotoluminescense emission from MoS2, two different doping zones are evident with sub-100 nm wide charge oscillations. The oscillations occur abruptly at the homojuction and extend over longer distances away from the interface, indicating imperfect deposition of the two-dimensional layer on the substrate. These results evidence fine and unexpected details of the homojuctions, important to build better electronic and optoelectronic devices.
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Affiliation(s)
- Andreij C Gadelha
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
- Department of Physics, Department of Chemistry, and JILA, University of Colorado at Boulder, Boulder, Colorado 80309, United States
| | - Thiago L Vasconcelos
- Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
| | - Luiz G Cançado
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Ado Jorio
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
- Electrical Engineering Graduate Program, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
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6
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Tschannen CD, Frimmer M, Gordeev G, Vasconcelos TL, Shi L, Pichler T, Reich S, Heeg S, Novotny L. Anti-Stokes Raman Scattering of Single Carbyne Chains. ACS Nano 2021; 15:12249-12255. [PMID: 34254777 DOI: 10.1021/acsnano.1c03893] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We investigate the anti-Stokes Raman scattering of single carbyne chains confined inside double-walled carbon nanotubes. Individual chains are identified using tip-enhanced Raman scattering (TERS) and heated by resonant excitation with varying laser powers. We study the temperature dependence of carbyne's Raman spectrum and quantify the laser-induced heating based on the anti-Stokes/Stokes ratio. Due to its molecular size and its large Raman cross section, carbyne holds great promise for local temperature monitoring, with potential applications ranging from nanoelectronics to biology.
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Affiliation(s)
| | - Martin Frimmer
- Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
| | - Georgy Gordeev
- Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
| | - Thiago L Vasconcelos
- Materials Metrology Division, Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO), 25250-020 Duque de Caxias, RJ, Brazil
| | - Lei Shi
- School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Nanotechnology Research Center, Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Thomas Pichler
- Faculty of Physics, Universität Wien, 1090 Wien, Austria
| | - Stephanie Reich
- Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
| | - Sebastian Heeg
- Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
- Department of Physics, Humboldt Universität zu Berlin, 12489 Berlin, Germany
| | - Lukas Novotny
- Photonics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
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7
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de O Pereira ML, de Souza Paiva R, Vasconcelos TL, Oliveira AG, Oliveira Salles M, Toma HE, Grasseschi D. Photoinduced electron transfer dynamics of AuNPs and Au@PdNPs supported on graphene oxide probed by dark-field hyperspectral microscopy. Dalton Trans 2020; 49:16296-16304. [PMID: 32412563 DOI: 10.1039/d0dt01018a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The time scale for interfacial photoinduced electron transfer (PeT) in plasmonic nanoparticles is not well established and the details are still under debate. This has renewed the interest in studying the electron transfer effect from both experimental and theoretical points of view. We present a quantitative analysis of PeT in single spherical gold (Au) and gold@palladium core@shell (Au@Pd) nanoparticles supported on reduced graphene oxide (RGO) using dark-field hyperspectral microscopy (DFHM) and electrochemical impedance spectroscopy (EIS). By studying the plasmon bandwidth in the scattering spectra of single particles and by correlating it to the plasmon damping processes we showed that PeT occurs from the AuNPs to RGO in a 10 fs time scale with a quantum efficiency of 35%. The introduction of a Pd shell on the AuNPs decreases the PeT time, with transfer occurring in as little as 1.7 fs with quantum yield higher than 74%. Furthermore, EIS showed a smaller resistance for PeT on RGO/Au@PdNPs under green light illumination. Our results can improve the understanding of the chemical interface damping process due to PeT in plasmonic nanomaterials and can enable the design of more efficient plasmon enhanced photocatalysts.
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Affiliation(s)
- Maria Luiza de O Pereira
- Instituto de Química, Universidade Federal do Rio de Janeiro (UFRJ), 21941-909, Rio de Janeiro, Brasil.
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8
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Oliveira BS, Archanjo BS, Valaski R, Achete CA, Cançado LG, Jorio A, Vasconcelos TL. Nanofabrication of plasmon-tunable nanoantennas for tip-enhanced Raman spectroscopy. J Chem Phys 2020; 153:114201. [DOI: 10.1063/5.0021560] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Affiliation(s)
- Bruno S. Oliveira
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
| | - Bráulio S. Archanjo
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
| | - Rogério Valaski
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
| | - Carlos A. Achete
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
| | - Luiz Gustavo Cançado
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30270-901, Brazil
| | - Ado Jorio
- Electrical Engineering and Innovation Technology Graduate Programs, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30270-901, Brazil
| | - Thiago L. Vasconcelos
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro), Duque de Caxias, RJ 25250-020, Brazil
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9
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Batista LN, Vasconcelos TL, Senna CA, Archanjo BS, Miguez E, A S San Gil R, Tavares MIB. Impact of nanoconfinement on acetylacetone Equilibria in Ordered Mesoporous Silicates. Nanotechnology 2020; 31:355706. [PMID: 32434178 DOI: 10.1088/1361-6528/ab94db] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nanoconfinement is one of the most intriguing nanoscale effects and affects several physical and chemical properties of molecules and materials, including viscosity, reaction kinetics, and glass transition temperature. In this work, liquid nuclear magnetic resonance (NMR) was used to analyze the behavior of 2,4-pentadienone in ordered mesoporous materials with a pore diameter of between 3 and 10 nm. The liquid NMR results showed meaningful changes in the hydrogen chemical shift and the keto-enol chemical equilibrium, which were associated with the pore diameter, allowing the authors to observe the effects of nanoconfinement. An interesting phenomenon was observed where the chemical equilibria of 2,4-pentadienone confined in a mesoporous material with a pore diameter of 3.5 nm was similar to that obtained with free (bulk) 2,4-pentadienone in larger pore materials. Another interesting result was observed for the enthalpy and entropy of the tautomeric equilibria of 2,4-pentadienone confined in mesoporous materials with a 5.5 nm pore diameter being -7.9 kJ mol-1 and -15.9 J mol-1.K. These values are similar to those obtained by dimethyl sulfoxide. This phenomenon indicates the possible use of ordered mesoporous materials as a reaction substitute in organic solvents. It was further observed that while the values of enthalpy (ΔH) and entropy (ΔS) had been modified by confinement, the Gibbs free energy (ΔG) value remained closer to that observed in free (bulk) 2,4-pentadienone. It is expected that this study will help in understanding the effects of nanoconfinement and provide a simple method to employ NMR techniques to analyze these phenomena.
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Affiliation(s)
- Luciano N Batista
- Instituto Nacional de Metrologia, Qualidade e Tecnologia, Avenida Nossa Senhora das Graças, 50, 25250020, Duque de Caxias, Rio de Janeiro, Brazil. Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Av. Horácio Macedo, 2030, 21941-598, Rio de Janeiro, Brazil
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10
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Sales DA, Marques TMF, Ghosh A, Gusmão SBS, Vasconcelos TL, Luz-Lima C, Ferreira OP, Hollanda LM, Lima IS, Silva-Filho EC, Dittz D, Lobo AO, Viana BC. Synthesis of silver-cerium titanate nanotubes and their surface properties and antibacterial applications. Mater Sci Eng C Mater Biol Appl 2020; 115:111051. [PMID: 32600685 DOI: 10.1016/j.msec.2020.111051] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 04/23/2020] [Accepted: 05/02/2020] [Indexed: 11/18/2022]
Abstract
Nano-heterostructures of titanate nanotubes were synthesized and they revealed a complex structure with the formation of TiO2 (anatase), CeO2, Ag2O and metallic silver nanoparticles on the outer walls and intercalation of Ce4+ and Ag+ into the interlayer spaces of the nanotubes by microwave-assisted hydrothermal process and subjected to ion exchange reactions. To the best of our knowledge, this is the first reported silver and cerium co-exchanged titanate nanotubes for bio-applications. The co-ion exchange processes preserved the original tubular structure of titanate nanotubes with significant changes of the superficial as well as interlamellar environment. This study opens up possibility of synthesizing complex, functional nano-heterostructure with the scope of modification of the final structure, especially the amount and oxidation state of the intercalated cation (Ce4+, Ce3+ and Ag+) as well as the quantity and variety of the decorating nanoparticles (CeO2, Ag2O or metallic Ag). The interplay of which, in turn, can lead to important biological properties and applications, owing to their ion-liberation capacity. The samples were tested in antibacterial activity with two different kind of bacteria (gram positive and negative), cell cytotoxicity and adhesion, and it was found that the nano-heterostructure formed shows high antibacterial activity with low cytotoxicity and high cell adhesion, which makes it a promising material for further health applications.
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Affiliation(s)
- Débora A Sales
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil
| | - Thalles M F Marques
- Instituto Federal de Educação, Ciência e Tecnologia do Piauí - IFPI, 64760-000, Campus São João do Piauí, PI, Brazil
| | - Anupama Ghosh
- LaMFA - Laboratório de Materiais Funcionais Avançados, Departamento de Física, Universidade Federal do Ceará - UFC, 60440-554 Fortaleza, Ceará, Brazil; Central Analítica, Universidade Federal do Ceará - UFC, 60440-554 Fortaleza, Ceará, Brazil
| | - Suziete B S Gusmão
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil
| | - Thiago L Vasconcelos
- Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, Rio de Janeiro 25250-020, Brazil
| | - Cleanio Luz-Lima
- Departamento de Física, Universidade Federal do Piauí - UFPI, 64049-550, Teresina, Piauí, Brazil
| | - Odair P Ferreira
- LaMFA - Laboratório de Materiais Funcionais Avançados, Departamento de Física, Universidade Federal do Ceará - UFC, 60440-554 Fortaleza, Ceará, Brazil
| | - Luciana M Hollanda
- Programa de Pós-Graduação em Biotecnologia Industrial, Universidade Tiradentes - UNIT, 49032-490 Aracaju, Sergipe, Brazil
| | - Idglan S Lima
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil
| | - Edson C Silva-Filho
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil
| | - Dalton Dittz
- Departamento de Bioquímica e Farmacologia, Universidade Federal do Piauí - UFPI, 64049-550 Teresina, Piauí, Brazil
| | - Anderson O Lobo
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil
| | - Bartolomeu C Viana
- Laboratório interdisciplinar de materiais avançados (LIMAV), Programa de Pós-Graduação em Ciência e Engenharia dos Materiais, Universidade Federal do Piauí - UFPI, Teresina, PI, Brazil; Departamento de Física, Universidade Federal do Piauí - UFPI, 64049-550, Teresina, Piauí, Brazil.
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11
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Alencar RS, Rabelo C, Miranda HLS, Vasconcelos TL, Oliveira BS, Ribeiro A, Públio BC, Ribeiro-Soares J, Filho AGS, Cançado LG, Jorio A. Probing Spatial Phonon Correlation Length in Post-Transition Metal Monochalcogenide GaS Using Tip-Enhanced Raman Spectroscopy. Nano Lett 2019; 19:7357-7364. [PMID: 31469281 DOI: 10.1021/acs.nanolett.9b02974] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The knowledge of the phonon coherence length is of great importance for two-dimensional-based materials since phonons can limit the lifetime of charge carriers and heat dissipation. Here we use tip-enhanced Raman spectroscopy (TERS) to measure the spatial correlation length Lc of the A1g1 and A1g2 phonons of monolayer and few-layer gallium sulfide (GaS). The differences in Lc values are responsible for different enhancements of the A1g modes, with A1g1 always enhancing more than the A1g2, independently of the number of GaS layers. For five layers, the results show an Lc of 64 and 47 nm for A1g1 and A1g2, respectively, and the coherence lengths decrease when decreasing the number of layers, indicating that scattering with the surface roughness plays an important role.
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Affiliation(s)
- R S Alencar
- Faculdade de Física , Universidade Federal do Pará , 66075-110 Belém-PA , Brazil
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
- Departamento de Física , Centro de Ciências, Universidade Federal do Ceará , P. O. Box 6030, Fortaleza , Ceará 60455-900 , Brazil
| | - Cassiano Rabelo
- Programa de Pós-Graduação em Engenharia Elétrica , Universidade Federal de Minas Gerais , Av. Antônio Carlos 6627 , 31270-901 Belo Horizonte , MG , Brazil
| | - Hudson L S Miranda
- Programa de Pós-Graduação em Engenharia Elétrica , Universidade Federal de Minas Gerais , Av. Antônio Carlos 6627 , 31270-901 Belo Horizonte , MG , Brazil
| | - Thiago L Vasconcelos
- Divisão de Metrologia de Materiais , Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO) , Duque de Caxias, Rio de Janeiro 25250-020 , Brazil
| | - Bruno S Oliveira
- Divisão de Metrologia de Materiais , Instituto Nacional de Metrologia Qualidade e Tecnologia (INMETRO) , Duque de Caxias, Rio de Janeiro 25250-020 , Brazil
| | - Aroldo Ribeiro
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Bruno C Públio
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Jenaina Ribeiro-Soares
- Departamento de Física , Universidade Federal de Lavras , Lavras , Minas Gerais 37200-000 , Brazil
| | - A G Souza Filho
- Departamento de Física , Centro de Ciências, Universidade Federal do Ceará , P. O. Box 6030, Fortaleza , Ceará 60455-900 , Brazil
| | - Luiz Gustavo Cançado
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
| | - Ado Jorio
- Departamento de Física , Universidade Federal de Minas Gerais , Belo Horizonte , Minas Gerais 30270-901 , Brazil
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12
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Santos NF, Pereira SO, Fernandes AJS, Vasconcelos TL, Fung CM, Archanjo BS, Achete CA, Teixeira SR, Silva RF, Costa FM. Physical Structure and Electrochemical Response of Diamond-Graphite Nanoplatelets: From CVD Synthesis to Label-Free Biosensors. ACS Appl Mater Interfaces 2019; 11:8470-8482. [PMID: 30694644 DOI: 10.1021/acsami.9b00352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Hybrid diamond-graphite nanoplatelet (DGNP) thin films are produced and applied to label-free impedimetric biosensors for the first time, using avidin detection as a proof of concept. The DGNPs are synthesized by microwave plasma chemical vapor deposition through H2/CH4/N2 gas mixtures in a reproducible and rapid single-step process. The material building unit consists of an inner two-dimensional-like nanodiamond with preferential vertical alignment covered by and covalently bound to nanocrystalline graphite grains, exhibiting {111}diamond||{0002}graphite epitaxy. The DGNP films' morphostructural aspects are of interest for electrochemical transduction, in general, and for Faradaic impedimetric biosensors, in particular, combining enhanced surface area for biorecognition element loading and facile Faradaic charge transfer. Charge transfer rate constants in phosphate buffer saline/[Fe(CN)6]4- solution are shown to increase up to 5.6 × 10-3 cm s-1 upon N2 addition to DGNP synthesis. For the impedimetric detection of avidin, biotin molecules are covalently bound as avidin specific recognition elements on (3-aminopropyl)triethoxysilane-functionalized DGNP surfaces. Avidin quantification is attained within the 10-1000 μg mL-1 range following a logarithmic dependency. The limits of detection and of quantitation are 1.3 and 6.4 μg mL-1 (19 and 93 nM), respectively, and 2.3 and 13.8 μg mL-1 (33 and 200 nM) when considering the nonspecific response of the sensors.
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Affiliation(s)
| | | | | | - Thiago L Vasconcelos
- Materials Metrology Division , INMETRO , 25250-020 Duque de Caxias , Rio de Janeiro , Brazil
| | - Chung M Fung
- Centre for NanoHealth, College of Engineering , Swansea University , Singleton Campus, Swansea SA2 8PP , U.K
| | - Bráulio S Archanjo
- Materials Metrology Division , INMETRO , 25250-020 Duque de Caxias , Rio de Janeiro , Brazil
| | - Carlos A Achete
- Materials Metrology Division , INMETRO , 25250-020 Duque de Caxias , Rio de Janeiro , Brazil
| | - Sofia R Teixeira
- College of Engineering , Swansea University , Bay Campus, Swansea SA1 8QQ , U.K
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13
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Arvelos MS, Silva AC, de Souza ALF, Achete CA, Vasconcelos TL, Robertis E, Archanjo BS, Aguiar LCS, Malta LFB, Senra JD. Revealing Pd Nanoparticles Formation from PEG-Mediated Decomposition of Organometallic Precursor and Their Application as Catalyst for the Synthesis of n-Extended Carbazoles. ChemistrySelect 2018. [DOI: 10.1002/slct.201801874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Matheus S. Arvelos
- Instituto de Química; Universidade do Estado do Rio de Janeiro, Rio de Janeiro; RJ 20550-900 Brazil
| | - Aires C. Silva
- Instituto Benjamim Constant, Rio de Janeiro; RJ 22290-240 Brazil
| | - Andrea L. F. de Souza
- Instituto de Química; Universidade Federal do Rio de Janeiro, Macaé; RJ 27930-560 Brazil
| | - Carlos A. Achete
- Divisão de Metrologia de Materiais; Instituto Nacional de Metrologia; Qualidade e Tecnologia, Duque de Caxias; RJ 25250−020 Brazil
| | - Thiago L. Vasconcelos
- Divisão de Metrologia de Materiais; Instituto Nacional de Metrologia; Qualidade e Tecnologia, Duque de Caxias; RJ 25250−020 Brazil
| | - Eveline Robertis
- Divisão de Metrologia de Materiais; Instituto Nacional de Metrologia; Qualidade e Tecnologia, Duque de Caxias; RJ 25250−020 Brazil
| | - Braulio S. Archanjo
- Divisão de Metrologia de Materiais; Instituto Nacional de Metrologia; Qualidade e Tecnologia, Duque de Caxias; RJ 25250−020 Brazil
| | - Lucia C. S. Aguiar
- Instituto de Química; Universidade Federal do Rio de Janeiro, Rio de Janeiro; RJ 21941-909 Brazil
| | - Luiz Fernando B. Malta
- Instituto de Química; Universidade Federal do Rio de Janeiro, Rio de Janeiro; RJ 21941-909 Brazil
| | - Jaqueline D. Senra
- Instituto de Química; Universidade do Estado do Rio de Janeiro, Rio de Janeiro; RJ 20550-900 Brazil
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14
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Santos NF, Holz T, Santos T, Fernandes AJS, Vasconcelos TL, Gouvea CP, Archanjo BS, Achete CA, Silva RF, Costa FM. Heat Dissipation Interfaces Based on Vertically Aligned Diamond/Graphite Nanoplatelets. ACS Appl Mater Interfaces 2015; 7:24772-24777. [PMID: 26495875 DOI: 10.1021/acsami.5b07633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Crystalline carbon-based materials are intrinsically chemically inert and good heat conductors, allowing their applications in a great variety of devices. A technological step forward in heat dissipators production can be given by tailoring the carbon phase microstructure, tuning the CVD synthesis conditions. In this work, a rapid bottom-up synthesis of vertically aligned hybrid material comprising diamond thin platelets covered by a crystalline graphite layer was developed. A single run was designed in order to produce a high aspect ratio nanostructured carbon material favoring the thermal dissipation under convection-governed conditions. The produced material was characterized by multiwavelength Raman spectroscopy and electron microscopy (scanning and transmission), and the macroscopic heat flux was evaluated. The results obtained confirm the enhancement of heat dissipation rate in the developed hybrid structures, when compared to smooth nanocrystalline diamond films.
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Affiliation(s)
- N F Santos
- i3N and Physics Department of University of Aveiro , 3810-193 Aveiro, Portugal
| | - T Holz
- i3N and Physics Department of University of Aveiro , 3810-193 Aveiro, Portugal
| | - T Santos
- CICECO and Physics Department of University of Aveiro , 3810-193 Aveiro, Portugal
| | - A J S Fernandes
- i3N and Physics Department of University of Aveiro , 3810-193 Aveiro, Portugal
| | - T L Vasconcelos
- Materials Metrology Division, INMETRO , 25250-020, Duque de Caxias - RJ, Brazil
| | - C P Gouvea
- Materials Metrology Division, INMETRO , 25250-020, Duque de Caxias - RJ, Brazil
| | - B S Archanjo
- Materials Metrology Division, INMETRO , 25250-020, Duque de Caxias - RJ, Brazil
| | - C A Achete
- Materials Metrology Division, INMETRO , 25250-020, Duque de Caxias - RJ, Brazil
| | - R F Silva
- CICECO and Dept. of Materials and Ceramic Engineering, University of Aveiro , 3810-193 Aveiro, Portugal
| | - F M Costa
- i3N and Physics Department of University of Aveiro , 3810-193 Aveiro, Portugal
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15
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Oliveira DS, Tizei LHG, Li A, Vasconcelos TL, Senna CA, Archanjo BS, Ugarte D, Cotta MA. Interaction between lamellar twinning and catalyst dynamics in spontaneous core-shell InGaP nanowires. Nanoscale 2015; 7:12722-12727. [PMID: 26152786 DOI: 10.1039/c5nr02747k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Semiconductor nanowires oriented along the [211] direction usually present twins parallel to their axis. For group IV nanowires this kind of twin allows the formation of a catalyst-nanowire interface composed of two equivalent {111} facets. For III-V nanowires, however, the twin will generate two facets with different polarities. In order to keep the <211> orientation stable, a balance in growth rates for these different facets must be reached. We report here the observation of stable, micron-long <211>-oriented InGaP nanowires with a spontaneous core-shell structure. We show that stacking fault formation in the crystal region corresponding to the {111}A facet termination provides a stable NW/NP interface for growth along the <211> direction. During sample cool down, however, the catalyst migrates to a lateral {111}B facet, allowing the growth of branches perpendicular to the initial orientation. In addition to that, we show that the core-shell structure is non-concentric, most likely due to the asymmetry between the facets formed in the NW sidewall; this effect generates stress along the nanowire, which can be relieved through bending.
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Affiliation(s)
- D S Oliveira
- Instituto de Física "GlebWataghin", Universidade Estadual de Campinas, UNICAMP, 13083-859, Campinas, SP, Brazil.
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16
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Vasconcelos TL, Archanjo BS, Fragneaud B, Oliveira BS, Riikonen J, Li C, Ribeiro DS, Rabelo C, Rodrigues WN, Jorio A, Achete CA, Cançado LG. Tuning Localized Surface Plasmon Resonance in Scanning Near-Field Optical Microscopy Probes. ACS Nano 2015; 9:6297-6304. [PMID: 26027751 DOI: 10.1021/acsnano.5b01794] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A reproducible route for tuning localized surface plasmon resonance in scattering type near-field optical microscopy probes is presented. The method is based on the production of a focused-ion-beam milled single groove near the apex of electrochemically etched gold tips. Electron energy-loss spectroscopy and scanning transmission electron microscopy are employed to obtain highly spatially and spectroscopically resolved maps of the milled probes, revealing localized surface plasmon resonance at visible and near-infrared wavelengths. By changing the distance L between the groove and the probe apex, the localized surface plasmon resonance energy can be fine-tuned at a desired absorption channel. Tip-enhanced Raman spectroscopy is applied as a test platform, and the results prove the reliability of the method to produce efficient scattering type near-field optical microscopy probes.
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Affiliation(s)
- Thiago L Vasconcelos
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
- ‡Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
| | - Bráulio S Archanjo
- ‡Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
| | - Benjamin Fragneaud
- §Departamento de Física, Universidade Federal de Juiz de Fora, Juiz de Fora, MG 36036-900, Brazil
| | - Bruno S Oliveira
- ‡Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
| | - Juha Riikonen
- ⊥Department of Micro- and Nanosciences, Aalto University, Tietotie 3, 02150 Espoo, Finland
| | - Changfeng Li
- ⊥Department of Micro- and Nanosciences, Aalto University, Tietotie 3, 02150 Espoo, Finland
| | - Douglas S Ribeiro
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
| | - Cassiano Rabelo
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
| | - Wagner N Rodrigues
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
| | - Ado Jorio
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
| | - Carlos A Achete
- ‡Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
- ∥Departamento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-972, Brazil
| | - Luiz Gustavo Cançado
- †Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30123-970, Brazil
- ‡Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Qualidade e Tecnologia (INMETRO), Duque de Caxias, RJ 25250-020, Brazil
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17
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Prado MC, Archanjo BS, Vasconcelos TL, Ladeira LO, Neves BRA. Characterizing inorganic crystals grown on organic self-assembled bilayers with scanning probe and electron microscopies. Microsc Res Tech 2013; 76:1278-83. [PMID: 24123490 DOI: 10.1002/jemt.22297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 08/13/2013] [Accepted: 09/15/2013] [Indexed: 11/07/2022]
Abstract
Combined microscopy techniques are used to establish the usability of phosphonic acid layers as promoters of hydroxyapatite (HAp) growth. Using spread coating, octadecylphosphonic acid (OPA) self-assembled bilayers are delivered to the thin natural oxide layer of a titanium film surface with no prior treatment. These bilayers aggregate two major advantages of phosphonic moieties to titanium surfaces: nucleation of hydroxyapatite crystals from ionic solution and affinity for both titanium oxide surface and HAp crystals. The functionalized substrates and bare titanium (control) samples are immersed in an aqueous solution containing calcium and phosphorus ions. Over a 4-week immersion time, OPA-functionalized substrates present numerous large agglomerates of inorganic crystals, in contrast to control samples, with no significant amount of deposits. Initial sample characterization was performed with atomic force microscopy (AFM). Compositional and structural characterization of these agglomerates (using TEM, EDS, and electron diffraction), revealed that they are indeed HAp, the main component of the inorganic bone matrix.
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Affiliation(s)
- Mariana C Prado
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, 30123-970, Brazil
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