351
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Proch S, Yoshino S, Gunjishima I, Kosaka S, Takahashi N, Kato N, Kodama K, Morimoto Y. Acetylene-Treated Titania Nanotube Arrays (TNAs) as Support for Oxygen Reduction Reaction (ORR) Platinum Thin Film Catalysts. Electrocatalysis (N Y) 2017. [DOI: 10.1007/s12678-017-0377-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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352
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Electrodeposition of polyaniline in long TiO2 nanotube arrays for high-areal capacitance supercapacitor electrodes. J Solid State Electrochem 2017. [DOI: 10.1007/s10008-017-3588-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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353
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Nevárez-Martínez MC, Mazierski P, Kobylański MP, Szczepańska G, Trykowski G, Malankowska A, Kozak M, Espinoza-Montero PJ, Zaleska-Medynska A. Growth, Structure, and Photocatalytic Properties of Hierarchical V₂O₅-TiO₂ Nanotube Arrays Obtained from the One-step Anodic Oxidation of Ti-V Alloys. Molecules 2017; 22:E580. [PMID: 28379185 PMCID: PMC6154676 DOI: 10.3390/molecules22040580] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 03/30/2017] [Accepted: 04/01/2017] [Indexed: 11/19/2022] Open
Abstract
V₂O₅-TiO₂ mixed oxide nanotube (NT) layers were successfully prepared via the one-step anodization of Ti-V alloys. The obtained samples were characterized by scanning electron microscopy (SEM), UV-Vis absorption, photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (DRX), and micro-Raman spectroscopy. The effect of the applied voltage (30-50 V), vanadium content (5-15 wt %) in the alloy, and water content (2-10 vol %) in an ethylene glycol-based electrolyte was studied systematically to determine their influence on the morphology, and for the first-time, on the photocatalytic properties of these nanomaterials. The morphology of the samples varied from sponge-like to highly-organized nanotubular structures. The vanadium content in the alloy was found to have the highest influence on the morphology and the sample with the lowest vanadium content (5 wt %) exhibited the best auto-alignment and self-organization (length = 1 μm, diameter = 86 nm and wall thickness = 11 nm). Additionally, a probable growth mechanism of V₂O₅-TiO₂ nanotubes (NTs) over the Ti-V alloys was presented. Toluene, in the gas phase, was effectively removed through photodegradation under visible light (LEDs, λmax = 465 nm) in the presence of the modified TiO₂ nanostructures. The highest degradation value was 35% after 60 min of irradiation. V₂O₅ species were ascribed as the main structures responsible for the generation of photoactive e- and h⁺ under Vis light and a possible excitation mechanism was proposed.
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Affiliation(s)
- María C Nevárez-Martínez
- Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, P.O. Box 17-01-2759, Quito 170525, Ecuador.
- Centro de Investigación y Control Ambiental "CICAM", Departamento de Ingeniería Civil y Ambiental, Facultad de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, P.O. Box 17-01-2759, Quito 170525, Ecuador.
| | - Paweł Mazierski
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Gdansk 80-308, Poland.
| | - Marek P Kobylański
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Gdansk 80-308, Poland.
| | | | - Grzegorz Trykowski
- Faculty of Chemistry, Nicolaus Copernicus University, Torun 87-100, Poland.
| | - Anna Malankowska
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Gdansk 80-308, Poland.
| | - Magda Kozak
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Gdansk 80-308, Poland.
| | - Patricio J Espinoza-Montero
- Centro de Investigación y Control Ambiental "CICAM", Departamento de Ingeniería Civil y Ambiental, Facultad de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, P.O. Box 17-01-2759, Quito 170525, Ecuador.
| | - Adriana Zaleska-Medynska
- Department of Environmental Technology, Faculty of Chemistry, University of Gdansk, Gdansk 80-308, Poland.
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354
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Zazpe R, Prikryl J, Gärtnerova V, Nechvilova K, Benes L, Strizik L, Jäger A, Bosund M, Sopha H, Macak JM. Atomic Layer Deposition Al 2O 3 Coatings Significantly Improve Thermal, Chemical, and Mechanical Stability of Anodic TiO 2 Nanotube Layers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3208-3216. [PMID: 28291942 PMCID: PMC5382572 DOI: 10.1021/acs.langmuir.7b00187] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We report on a very significant enhancement of the thermal, chemical, and mechanical stability of self-organized TiO2 nanotubes layers, provided by thin Al2O3 coatings of different thicknesses prepared by atomic layer deposition (ALD). TiO2 nanotube layers coated with Al2O3 coatings exhibit significantly improved thermal stability as illustrated by the preservation of the nanotubular structure upon annealing treatment at high temperatures (870 °C). In addition, a high anatase content is preserved in the nanotube layers against expectation of the total rutile conversion at such a high temperature. Hardness of the resulting nanotube layers is investigated by nanoindentation measurements and shows strongly improved values compared to uncoated counterparts. Finally, it is demonstrated that Al2O3 coatings guarantee unprecedented chemical stability of TiO2 nanotube layers in harsh environments of concentrated H3PO4 solutions.
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Affiliation(s)
- Raul Zazpe
- Center
of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, nam. Cs. legii 565, 53002 Pardubice, Czech Republic
| | - Jan Prikryl
- Center
of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, nam. Cs. legii 565, 53002 Pardubice, Czech Republic
| | - Viera Gärtnerova
- Laboratory
of Nanostructures and Nanomaterials, Institute
of Physics of the CAS, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
| | - Katerina Nechvilova
- Institute of Chemistry and Technology of Macromolecular Materials,
Faculty of Chemical Technology, and Department of General and Inorganic Chemistry,
Faculty of Chemical Technology, University
of Pardubice, Studentska
573, 532 10 Pardubice, Czech Republic
| | - Ludvik Benes
- Joint
laboratory of Solid-State Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 95, 532
10 Pardubice, Czech Republic
| | - Lukas Strizik
- Center
of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, nam. Cs. legii 565, 53002 Pardubice, Czech Republic
- Institute of Chemistry and Technology of Macromolecular Materials,
Faculty of Chemical Technology, and Department of General and Inorganic Chemistry,
Faculty of Chemical Technology, University
of Pardubice, Studentska
573, 532 10 Pardubice, Czech Republic
| | - Ales Jäger
- Laboratory
of Nanostructures and Nanomaterials, Institute
of Physics of the CAS, v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
| | | | - Hanna Sopha
- Center
of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, nam. Cs. legii 565, 53002 Pardubice, Czech Republic
| | - Jan M. Macak
- Center
of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, nam. Cs. legii 565, 53002 Pardubice, Czech Republic
- E-mail , Ph +420-466 037 401 (J.M.M.)
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355
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Zhou X, Liu N, Schmuki P. Photocatalysis with TiO2 Nanotubes: “Colorful” Reactivity and Designing Site-Specific Photocatalytic Centers into TiO2 Nanotubes. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03709] [Citation(s) in RCA: 190] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xuemei Zhou
- Department
of Materials Science WW4, LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Ning Liu
- Department
of Materials Science WW4, LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Patrik Schmuki
- Department
of Materials Science WW4, LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- Department
of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21569, Saudi Arabia
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356
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A new electrochemical platform for ultrasensitive detection of atrazine based on modified self-ordered Nb 2 O 5 nanotube arrays. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.03.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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357
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Ide S, Capraz ÖÖ, Shrotriya P, Hebert KR. Oxide Microstructural Changes Accompanying Pore Formation During Anodic Oxidation of Aluminum. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.113] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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358
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Mazierski P, Nadolna J, Lisowski W, Winiarski MJ, Gazda M, Nischk M, Klimczuk T, Zaleska-Medynska A. Effect of irradiation intensity and initial pollutant concentration on gas phase photocatalytic activity of TiO 2 nanotube arrays. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.09.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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359
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Electrical transport properties of polycrystalline and amorphous TiO 2 single nanotubes. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.nanoso.2017.03.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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360
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Fast growth of TiO 2 nanotube arrays with controlled tube spacing based on a self-ordering process at two different scales. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.03.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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361
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Ozkan S, Nguyen NT, Hwang I, Mazare A, Schmuki P. Highly Conducting Spaced TiO 2 Nanotubes Enable Defined Conformal Coating with Nanocrystalline Nb 2 O 5 and High Performance Supercapacitor Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603821. [PMID: 28145627 DOI: 10.1002/smll.201603821] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/19/2016] [Indexed: 06/06/2023]
Abstract
Establishing self-organized spacing between TiO2 nanotubes allows for highly conformal Nb2 O5 deposition that can be adjusted to optimized supercapacitive behavior.
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Affiliation(s)
- Selda Ozkan
- Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, Friedrich-Alexander University, Martensstraße 7, D-91058, Erlangen, Germany
| | - Nhat Truong Nguyen
- Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, Friedrich-Alexander University, Martensstraße 7, D-91058, Erlangen, Germany
| | - Imgon Hwang
- Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, Friedrich-Alexander University, Martensstraße 7, D-91058, Erlangen, Germany
| | - Anca Mazare
- Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, Friedrich-Alexander University, Martensstraße 7, D-91058, Erlangen, Germany
| | - Patrik Schmuki
- Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, Friedrich-Alexander University, Martensstraße 7, D-91058, Erlangen, Germany
- Chemistry Department, Faculty of Sciences, King Abdulaziz University, 80203, Jeddah, Kingdom of Saudi Arabia
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362
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Upadhyay KK, Altomare M, Eugénio S, Schmuki P, Silva TM, Montemor MF. On the Supercapacitive Behaviour of Anodic Porous WO3-Based Negative Electrodes. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.131] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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363
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Liang Y, Guan ZC, Wang HP, Du RG. Enhanced photoelectrochemical anticorrosion performance of WO 3 /TiO 2 nanotube composite films formed by anodization and electrodeposition. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.03.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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364
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Szirmai P, Stevens J, Horváth E, Ćirić L, Kollár M, Forró L, Náfrádi B. Competitive ion-exchange of manganese and gadolinium in titanate nanotubes. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.11.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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365
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Self-Organized TiO₂-MnO₂ Nanotube Arrays for Efficient Photocatalytic Degradation of Toluene. Molecules 2017; 22:molecules22040564. [PMID: 28362359 PMCID: PMC6154631 DOI: 10.3390/molecules22040564] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 11/16/2022] Open
Abstract
Vertically oriented, self-organized TiO₂-MnO₂ nanotube arrays were successfully obtained by one-step anodic oxidation of Ti-Mn alloys in an ethylene glycol-based electrolyte. The as-prepared samples were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV-Vis absorption, photoluminescence spectroscopy, X-ray diffraction (XRD), and micro-Raman spectroscopy. The effect of the applied potential (30-50 V), manganese content in the alloy (5-15 wt. %) and water content in the electrolyte (2-10 vol. %) on the morphology and photocatalytic properties was investigated for the first time. The photoactivity was assessed in the toluene removal reaction under visible light, using low-powered LEDs as an irradiation source (λmax = 465 nm). Morphology analysis showed that samples consisted of auto-aligned nanotubes over the surface of the alloy, their dimensions were: diameter = 76-118 nm, length = 1.0-3.4 μm and wall thickness = 8-11 nm. It was found that the increase in the applied potential led to increase the dimensions while the increase in the content of manganese in the alloy brought to shorter nanotubes. Notably, all samples were photoactive under the influence of visible light and the highest degradation achieved after 60 min of irradiation was 43%. The excitation mechanism of TiO₂-MnO₂ NTs under visible light was presented, pointing out the importance of MnO₂ species for the generation of e- and h⁺.
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366
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Wang T, Liu X, Zhu Y, Cui ZD, Yang XJ, Pan H, Yeung KK, Wu S. Metal Ion Coordination Polymer-Capped pH-Triggered Drug Release System on Titania Nanotubes for Enhancing Self-antibacterial Capability of Ti Implants. ACS Biomater Sci Eng 2017; 3:816-825. [DOI: 10.1021/acsbiomaterials.7b00103] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Tingting Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Xiangmei Liu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Yizhou Zhu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
| | - Z. D. Cui
- School of Materials Science & Engineering, Tianjin University, Tianjin 300072, China
| | - X. J. Yang
- School of Materials Science & Engineering, Tianjin University, Tianjin 300072, China
| | - Haobo Pan
- Center
for Human Tissues and Organs Degeneration, Shenzhen Institutes of
Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - K.W. K. Yeung
- Department of Orthopaedics & Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
| | - Shuilin Wu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science & Engineering, Hubei University, Wuhan 430062, China
- School of Materials Science & Engineering, Tianjin University, Tianjin 300072, China
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367
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Portenkirchner E, Neri G, Lichtinger J, Brumbarov J, Rüdiger C, Gernhäuser R, Kunze-Liebhäuser J. Tracking areal lithium densities from neutron activation - quantitative Li determination in self-organized TiO 2 nanotube anode materials for Li-ion batteries. Phys Chem Chem Phys 2017; 19:8602-8611. [PMID: 28290567 DOI: 10.1039/c7cp00180k] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nanostructuring of electrode materials is a promising approach to enhance the performance of next-generation, high-energy density lithium (Li)-ion batteries. Various experimental and theoretical approaches allow for a detailed understanding of solid-state or surface-controlled reactions that occur in nanoscaled electrode materials. While most techniques which are suitable for nanomaterial investigations are restricted to analysis widths of the order of Å to some nm, they do not allow for characterization over the length scales of interest for electrode design, which is typically in the order of mm. In this work, three different self-organized anodic titania nanotube arrays, comprising as-grown amorphous titania nanotubes, carburized anatase titania nanotubes, and silicon coated carburized anatase titania nanotubes, have been synthesized and studied as model composite anodes for use in Li-ion batteries. Their 2D areal Li densities have been successfully reconstructed with a sub-millimeter spatial resolution over lateral electrode dimensions of 20 mm exploiting the 6Li(n,α)3H reaction, in spite of the extremely small areal Li densities (10-20 μg cm-2 Li) in the nanotubular active material. While the average areal Li densities recorded via triton analysis are found to be in good agreement with the electrochemically measured charges during lithiation, triton analysis revealed, for certain nanotube arrays, areas with a significantly higher Li content ('hot spots') compared to the average. In summary, the presented technique is shown to be extremely well suited for analysis of the lithiation behavior of nanostructured electrode materials with very low Li concentrations. Furthermore, identification of lithiation anomalies is easily possible, which allows for fundamental studies and thus for further advancement of nanostructured Li-ion battery electrodes.
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Affiliation(s)
- E Portenkirchner
- Leopold-Franzens-University Innsbruck, Institute of Physical Chemistry, Innrain 52c, Innsbruck, 6020, Austria.
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368
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Hejazi S, Nguyen NT, Mazare A, Schmuki P. Aminated TiO 2 nanotubes as a photoelectrochemical water splitting photoanode. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.07.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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369
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The double-walled nature of TiO 2 nanotubes and formation of tube-in-tube structures – a characterization of different tube morphologies. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.02.094] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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370
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Das S, Sopha H, Krbal M, Zazpe R, Podzemna V, Prikryl J, Macak JM. Electrochemical Infilling of CuInSe 2 within TiO 2 Nanotube Layers and Subsequent Photoelectrochemical Studies. ChemElectroChem 2017; 4:495-499. [PMID: 28392991 PMCID: PMC5363378 DOI: 10.1002/celc.201600763] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Indexed: 11/24/2022]
Abstract
Anodic self‐organized TiO2 nanotube layers (with different aspect ratios) were electrochemically infilled with CuInSe2 nanocrystals with the aim to prepare heterostructures with a photoelectrochemical response in the visible light. The resulting heterostructure assembly was confirmed by field‐emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X‐ray diffraction (XRD). High incident photon‐to‐electron conversion efficiency values exceeding 55% were obtained in the visible‐light region. The resulting heterostructures show promise as a candidate for solid‐state solar cells.
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Affiliation(s)
- Sayantan Das
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Hanna Sopha
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Milos Krbal
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Raul Zazpe
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Veronika Podzemna
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Jan Prikryl
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
| | - Jan M Macak
- Center of Materials and Nanotechnologies Faculty of Chemical Technology University of Pardubice Nam. Cs. Legii 565 53002 Pardubice Czech Republic
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371
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Jiang P, Li S, Lai J, Zheng H, Lin C, Shi P, Wang Y. Nanoparticle-Programmed Surface for Drug Release and Cell Regulation via Reversible Hybridization Reaction. ACS APPLIED MATERIALS & INTERFACES 2017; 9:4467-4474. [PMID: 28117570 PMCID: PMC5462454 DOI: 10.1021/acsami.6b14355] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A surface directly connects the bulk of a material to its surroundings. The ability to dynamically regulate the surface without affecting the bulk of a material holds great potential for new applications. The purpose of this work was to demonstrate that the surface can be dynamically changed using nanoparticles and oligonucleotides (ODNs) in a reversible and reiterative manner. A dual-functional nanogel was synthesized as the model of nanoparticles using miniemulsion polymerization and click chemistry. The nanogel can not only adsorb drugs for sustained drug release but also bind a surface functionalized with complementary ODNs. Importantly, hybridization reaction and ODN degradation can drive reversible and reiterative nanogel binding to the surface for dynamic change, which in principle is unlimited. Moreover, nanogel-mediated dynamic change offers the surface with the drug-releasing function for inhibiting the growth of surrounding cells. Because nanogels can be replaced by any functional nanoparticles with a diverse array of properties, nanoparticle-programmed surface change constitutes a promising platform for various applications such as drug delivery and stent implantation.
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Affiliation(s)
- Pinliang Jiang
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Chemistry, College of Chemistry and Chemical Engineering & College of Materials, Xiamen University , Xiamen 361005, China
| | - Shihui Li
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Jinping Lai
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Hong Zheng
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Department of Chemistry, College of Chemistry and Chemical Engineering & College of Materials, Xiamen University , Xiamen 361005, China
| | - Changjian Lin
- Department of Chemistry, College of Chemistry and Chemical Engineering & College of Materials, Xiamen University , Xiamen 361005, China
| | - Peng Shi
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Yong Wang
- Department of Biomedical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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372
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Han H, Riboni F, Karlicky F, Kment S, Goswami A, Sudhagar P, Yoo J, Wang L, Tomanec O, Petr M, Haderka O, Terashima C, Fujishima A, Schmuki P, Zboril R. α-Fe 2O 3/TiO 2 3D hierarchical nanostructures for enhanced photoelectrochemical water splitting. NANOSCALE 2017; 9:134-142. [PMID: 27874124 DOI: 10.1039/c6nr06908h] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report the fabrication of 3D hierarchical hetero-nanostructures composed of thin α-Fe2O3 nanoflakes branched on TiO2 nanotubes. The novel α-Fe2O3/TiO2 hierarchical nanostructures, synthesized on FTO through a multi-step hydrothermal process, exhibit enhanced performances in photo-electrochemical water splitting and in the photocatalytic degradation of an organic dye, with respect to pure TiO2 nanotubes. An enhanced separation of photogenerated charge carriers is here proposed as the main factor for the observed photo-activities: electrons photogenerated in TiO2 are efficiently collected at FTO, while holes are transferred to the α-Fe2O3 nanobranches that serve as charge mediators to the electrolyte. The morphology of α-Fe2O3 that varies from ultrathin nanoflakes to nanorod/nanofiber structures depending on the Fe precursor concentration was shown to have a significant impact on the photo-induced activity of the α-Fe2O3/TiO2 composites. In particular, it is shown that for an optimized photo-electrochemical structure, a combination of critical factors should be achieved such as (i) TiO2 light absorption and photo-activation vs.α-Fe2O3-induced shadowing effect and (ii) the availability of free TiO2 surface vs.α-Fe2O3-coated surface. Finally, theoretical analysis, based on DFT calculations, confirmed the optical properties experimentally determined for the α-Fe2O3/TiO2 hierarchical nanostructures. We anticipate that this new multi-step hydrothermal process can be a blueprint for the design and development of other hierarchical heterogeneous metal oxide electrodes suitable for photo-electrochemical applications.
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Affiliation(s)
- Hyungkyu Han
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Slechtitelu 11, 783 71 Olomouc, Czech Republic.
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373
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Abstract
In vivo imaging, which enables us to peer deeply within living subjects, is producing tremendous opportunities both for clinical diagnostics and as a research tool. Contrast material is often required to clearly visualize the functional architecture of physiological structures. Recent advances in nanomaterials are becoming pivotal to generate the high-resolution, high-contrast images needed for accurate, precision diagnostics. Nanomaterials are playing major roles in imaging by delivering large imaging payloads, yielding improved sensitivity, multiplexing capacity, and modularity of design. Indeed, for several imaging modalities, nanomaterials are now not simply ancillary contrast entities, but are instead the original and sole source of image signal that make possible the modality's existence. We address the physicochemical makeup/design of nanomaterials through the lens of the physical properties that produce contrast signal for the cognate imaging modality-we stratify nanomaterials on the basis of their (i) magnetic, (ii) optical, (iii) acoustic, and/or (iv) nuclear properties. We evaluate them for their ability to provide relevant information under preclinical and clinical circumstances, their in vivo safety profiles (which are being incorporated into their chemical design), their modularity in being fused to create multimodal nanomaterials (spanning multiple different physical imaging modalities and therapeutic/theranostic capabilities), their key properties, and critically their likelihood to be clinically translated.
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Affiliation(s)
- Bryan Ronain Smith
- Stanford University , 3155 Porter Drive, #1214, Palo Alto, California 94304-5483, United States
| | - Sanjiv Sam Gambhir
- The James H. Clark Center , 318 Campus Drive, First Floor, E-150A, Stanford, California 94305-5427, United States
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374
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Junkar I, Kulkarni M, Humpolíček P, Capáková Z, Burja B, Mazare A, Schmuki P, Mrak-Poljšak K, Flašker A, Žigon P, Čučnik S, Mozetič M, Tomšič M, Iglič A, Sodin-Semrl S. Could Titanium Dioxide Nanotubes Represent a Viable Support System for Appropriate Cells in Vascular Implants? ADVANCES IN BIOMEMBRANES AND LIPID SELF-ASSEMBLY 2017. [DOI: 10.1016/bs.abl.2016.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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375
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Yu L, He J, Huang C, Li M, Zhang Y, Zhou X, Zhu H. Electron transportation path build for superior photoelectrochemical performance of Ag3PO4/TiO2. RSC Adv 2017. [DOI: 10.1039/c7ra11283a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient electron transportation path built through preparing Ag3PO4/TiO2 heterojunction by dipping method. It has a higher photocurrent density of 2.34 mA cm−2.
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Affiliation(s)
- Lianqing Yu
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Jiandong He
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Chengxing Huang
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Ming Li
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Yaping Zhang
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Xiaoyan Zhou
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
| | - Haifeng Zhu
- College of Science
- China University of Petroleum
- Qingdao 266580
- China
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376
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Momeni MM, Ghayeb Y, Shafiei M. Preparation and characterization of CrFeWTiO2 photoanodes and their photoelectrochemical activities for water splitting. Dalton Trans 2017; 46:12527-12536. [DOI: 10.1039/c7dt01596h] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The chemical bath deposition (CBD) method was successfully applied to prepare WTiO2 nanotube arrays co-deposited with chromium, iron and chromium–iron nanoparticles.
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Affiliation(s)
| | - Yousef Ghayeb
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
| | - Mojgan Shafiei
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156-83111
- Iran
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377
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Xue C, Hu S, Chang Q, Li Y, Liu X, Yang J. Fluoride doped SrTiO3/TiO2 nanotube arrays with a double layer walled structure for enhanced photocatalytic properties and bioactivity. RSC Adv 2017. [DOI: 10.1039/c7ra07741f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Fluoride doped double layer walled SrTiO3/TiO2 nanotube arrays were obtained and demonstrated enhanced photocatalytic properties and bioactivity.
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Affiliation(s)
- Chaorui Xue
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
| | - Shengliang Hu
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
| | - Qing Chang
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
| | - Ying Li
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
| | - Xi Liu
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
| | - Jinlong Yang
- School of Materials Science and Engineering
- North University of China
- Taiyuan 030051
- P. R. China
- School of Materials Science and Engineering
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378
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Verma R, Gangwar J, Srivastava AK. Multiphase TiO2nanostructures: a review of efficient synthesis, growth mechanism, probing capabilities, and applications in bio-safety and health. RSC Adv 2017. [DOI: 10.1039/c7ra06925a] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
This review article provides an exhaustive overview of efficient synthesis, growth mechanism and research activities of multiphase TiO2nanostructures to provide their structural, morphological, optical and biological properties co-relations.
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Affiliation(s)
- Rajni Verma
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110 012
- India
- Sophisticated and Analytical Equipments Division
| | - Jitendra Gangwar
- Sophisticated and Analytical Equipments Division
- CSIR – National Physical Laboratory
- New Delhi – 110 012
- India
- Department of Physics
| | - Avanish K. Srivastava
- Academy of Scientific and Innovative Research
- CSIR – National Physical Laboratory
- New Delhi – 110 012
- India
- Sophisticated and Analytical Equipments Division
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379
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Zhang S, Yu M, Xu L, Zhao S, Che J, Zhu X. Formation mechanism of multilayer TiO 2 nanotubes in HBF 4 electrolyte. RSC Adv 2017. [DOI: 10.1039/c7ra05624a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Multilayer anodic TiO2 nanotubes with A-shaped sidewalls are first fabricated in HBF4-containing electrolyte by a one-step galvanostatic anodization.
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Affiliation(s)
- Shaoyu Zhang
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry
- Nanjing University of Science and Technology
- Nanjing 210094
- China
- Jiangsu Urban and Rural Construction College
| | - Mengshi Yu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Liming Xu
- Jiangsu Urban and Rural Construction College
- Changzhou 213147
- China
| | - Siwei Zhao
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Jianfei Che
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Xufei Zhu
- Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry
- Nanjing University of Science and Technology
- Nanjing 210094
- China
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380
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Kment S, Riboni F, Pausova S, Wang L, Wang L, Han H, Hubicka Z, Krysa J, Schmuki P, Zboril R. Photoanodes based on TiO2and α-Fe2O3for solar water splitting – superior role of 1D nanoarchitectures and of combined heterostructures. Chem Soc Rev 2017; 46:3716-3769. [DOI: 10.1039/c6cs00015k] [Citation(s) in RCA: 412] [Impact Index Per Article: 58.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Solar driven photoelectrochemical water splitting represents a promising approach for a sustainable and environmentally friendly production of renewable energy vectors and fuel sources, such as H2.
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381
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Sopha H, Pohl D, Damm C, Hromadko L, Rellinghaus B, Gebert A, Macak JM. Self-organized double-wall oxide nanotube layers on glass-forming Ti-Zr-Si(-Nb) alloys. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 70:258-263. [PMID: 27770889 DOI: 10.1016/j.msec.2016.08.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 08/03/2016] [Accepted: 08/25/2016] [Indexed: 11/25/2022]
Abstract
In this work, we report for the first time on the use of melt spun glass-forming alloys - Ti75Zr10Si15 (TZS) and Ti60Zr10Si15Nb15 (TZSN) - as substrates for the growth of anodic oxide nanotube layers. Upon their anodization in ethylene glycol based electrolytes, highly ordered nanotube layers were achieved. In comparison to TiO2 nanotube layers grown on Ti foils, under the same conditions for reference, smaller diameter nanotubes (~116nm for TZS and ~90nm for TZSN) and shorter nanotubes (~11.5μm and ~6.5μm for TZS and TZSN, respectively) were obtained for both amorphous alloys. Furthermore, TEM and STEM studies, coupled with EDX analysis, revealed a double-wall structure of the as-grown amorphous oxide nanotubes with Ti species being enriched in the inner wall, and Si species in the outer wall, whereby Zr and Nb species were homogeneously distributed.
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Affiliation(s)
- Hanna Sopha
- Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, 53002 Pardubice, Czech Republic
| | - Darius Pohl
- Department of Metastable and Nanostructured Materials, Institute for Metallic Materials, Leibniz-Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01171 Dresden, Germany
| | - Christine Damm
- Department of Metastable and Nanostructured Materials, Institute for Metallic Materials, Leibniz-Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01171 Dresden, Germany
| | - Ludek Hromadko
- Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, 53002 Pardubice, Czech Republic
| | - Bernd Rellinghaus
- Department of Metastable and Nanostructured Materials, Institute for Metallic Materials, Leibniz-Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01171 Dresden, Germany
| | - Annett Gebert
- Department of Chemistry of Functional Materials, Institute for Complex Materials, Leibniz-Institute for Solid State and Materials Research IFW Dresden, Helmholtzstr. 20, 01171 Dresden, Germany
| | - Jan M Macak
- Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, 53002 Pardubice, Czech Republic.
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382
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Cottineau T, Cachet H, Keller V, Sutter EMM. Influence of the anatase/rutile ratio on the charge transport properties of TiO2-NTs arrays studied by dual wavelength opto-electrochemical impedance spectroscopy. Phys Chem Chem Phys 2017; 19:31469-31478. [DOI: 10.1039/c7cp06270b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dual wavelength IMPS allows the determination of the charge transport properties of multiphasic photo-electrodes.
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Affiliation(s)
- T. Cottineau
- CNRS
- Univ. Strasbourg
- UMR 7515
- Institut de Chimie et Procédés pour l’Energie
- l’Environnement et la Santé
| | - H. Cachet
- Sorbonne Universités
- UPMC Univ. Paris 06
- CNRS
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris
| | - V. Keller
- CNRS
- Univ. Strasbourg
- UMR 7515
- Institut de Chimie et Procédés pour l’Energie
- l’Environnement et la Santé
| | - E. M. M. Sutter
- Sorbonne Universités
- UPMC Univ. Paris 06
- CNRS
- Laboratoire Interfaces et Systèmes Electrochimiques
- Paris
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383
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Idígoras J, Anta JA, Berger T. Charge Transfer Reductive in situ Doping of Mesoporous TiO 2 Photoelectrodes - Impact of Electrolyte Composition and Film Morphology. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:27882-27894. [PMID: 32903294 PMCID: PMC7116043 DOI: 10.1021/acs.jpcc.6b09926] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Some material properties depend not only on synthesis and processing parameters, but may furthermore significantly change during operation. This is particularly true for high surface area materials. We used a combined electrochemical and spectroscopic approach to follow the changes of the photoelectrocatalytic activity and of the electronic semiconductor properties of mesoporous TiO2 films upon charge transfer reductive doping. Shallow donors (i.e. electron/proton pairs) were introduced into the semiconductor by the application of an external potential or, alternatively, by band gap excitation at open circuit conditions. In the latter case the effective open circuit doping potential depends critically on electrolyte composition (e.g. the presence of electron or hole acceptors). Transient charge accumulation (electrons and protons) in nanoparticle electrodes results in a photocurrent enhancement which is attributed to the deactivation of recombination centers. In nanotube electrodes the formation of a space charge layer results in an additional decrease of charge recombination at positive potentials. Doping is transient in nanoparticle films, but turns out to be stable for nanotube arrays.
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Affiliation(s)
- Jesús Idígoras
- Departamento de Sistemas Físicos, Químicos y Naturales, Área de Química Física, Universidad Pablo de Olavide, Ctra. Utrera, km 1, E-41013 Sevilla, Spain
| | - Juan A. Anta
- Departamento de Sistemas Físicos, Químicos y Naturales, Área de Química Física, Universidad Pablo de Olavide, Ctra. Utrera, km 1, E-41013 Sevilla, Spain
| | - Thomas Berger
- Departamento de Sistemas Físicos, Químicos y Naturales, Área de Química Física, Universidad Pablo de Olavide, Ctra. Utrera, km 1, E-41013 Sevilla, Spain
- Department of Chemistry and Physics of Materials, University of Salzburg, Hellbrunnerstraße 34/III, A-5020 Salzburg, Austria
- Corresponding author:, Department of Chemistry and Physics of Materials, University of Salzburg, Hellbrunnerstraße 34/III, A-5020 Salzburg, Austria, Phone: +43-662-8044-5931
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384
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Zheng L, Yu P, Hu K, Teng F, Chen H, Fang X. Scalable-Production, Self-Powered TiO 2 Nanowell-Organic Hybrid UV Photodetectors with Tunable Performances. ACS APPLIED MATERIALS & INTERFACES 2016; 8:33924-33932. [PMID: 27960373 DOI: 10.1021/acsami.6b11012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Hybrid inorganic-organic photoelectric devices draw considerable attention because of their unique features by combining the tunable functionality of organic molecules and the superior intrinsic carrier mobilities of inorganic semiconductors. An ordered thin layer of TiO2 nanowells is formed in situ with shallow nanoconcave patterns without cracking with scalable production by a facile and economic strategy, and these layers are used as building blocks to construct hybrid UV photodetectors (PDs). Organic conducting polymers (polyaniline (PANI) with various morphologies) have been exploited as p-type materials, enabling tunable photodetection performances at zero bias. The thin layer of n-type TiO2 nanowells is favorable for electron transport and light absorption with respect to their conventional nanotubular counterparts, while PANI acts as a hopping state or bridge to largely enhance the transition probability of the valence electrons in TiO2 to its conduction band, resulting in an increase in photocurrent in a self-powered mode. In particular, the lowest polyaniline loading sample (TP1) exhibits the highest responsivity (3.6 mA·W-1), largest on-off switching ratio (∼103), excellent wavelength selectivity, fast response speed (3.8/30.7 ms), and good stability under 320 nm light illumination (0.56 mW·cm-2) without an external energy supply. This work might be of great value in developing tunable UV photoresponse materials with respect to low cost and a large area for future energy-efficient optoelectronic devices.
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Affiliation(s)
- Lingxia Zheng
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
| | - Pingping Yu
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
| | - Kai Hu
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
| | - Feng Teng
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
| | - Hongyu Chen
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
| | - Xiaosheng Fang
- Department of Materials Science, Fudan University , Shanghai 200433, PR China
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385
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Ding L, Ma C, Li L, Zhang L, Yu J. A photoelectrochemical sensor for hydrogen sulfide in cancer cells based on the covalently and in situ grafting of CdS nanoparticles onto TiO2 nanotubes. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.11.025] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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386
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Electrochemical and photoelectrochemical characterization of photoanodes based on titania nanotubes modified by a BiVO4 thin film and gold nanoparticles. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.194] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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387
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Lorenzetti M, Gongadze E, Kulkarni M, Junkar I, Iglič A. Electrokinetic Properties of TiO2 Nanotubular Surfaces. NANOSCALE RESEARCH LETTERS 2016; 11:378. [PMID: 27562014 PMCID: PMC4999383 DOI: 10.1186/s11671-016-1594-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
Surface charge is one of the most significant properties for the characterisation of a biomaterial, being a key parameter in the interaction of the body implant with the surrounding living tissues. The present study concerns the systematic assessment of the surface charge of electrochemically anodized TiO2 nanotubular surfaces, proposed as coating material for Ti body implants. Biologically relevant electrolytes (NaCl, PBS, cell medium) were chosen to simulate the physiological conditions. The measurements were accomplished as titration curves at low electrolytic concentration (10(-3) M) and as single points at fixed pH but at various electrolytic concentrations (up to 0.1 M). The results showed that all the surfaces were negatively charged at physiological pH. However, the zeta potential values were dependent on the electrolytic conditions (electrolyte ion concentration, multivalence of the electrolyte ions, etc.) and on the surface characteristics (nanotubes top diameter, average porosity, exposed surface area, wettability, affinity to specific ions, etc.). Accordingly, various explanations were proposed to support the different experimental data among the surfaces. Theoretical model of electric double layer which takes into account the asymmetric finite size of ions in electrolyte and orientational ordering of water dipoles was modified according to our specific system in order to interpret the experimental data. Experimental results were in agreement with the theoretical predictions. Overall, our results contribute to enrich the state-of-art on the characterisation of nanostructured implant surfaces at the bio-interface, especially in case of topographically porous and rough surfaces.
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Affiliation(s)
| | - Ekaterina Gongadze
- Faculty of Electrical Engineering, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - Mukta Kulkarni
- Faculty of Electrical Engineering, University of Ljubljana, 1000, Ljubljana, Slovenia
| | - Ita Junkar
- Jožef Stefan Institute, Jamova cesta 39, 1000, Ljubljana, Slovenia
| | - Aleš Iglič
- Faculty of Electrical Engineering, University of Ljubljana, 1000, Ljubljana, Slovenia.
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388
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Altomare M, Nguyen NT, Schmuki P. Templated dewetting: designing entirely self-organized platforms for photocatalysis. Chem Sci 2016; 7:6865-6886. [PMID: 28567258 PMCID: PMC5450593 DOI: 10.1039/c6sc02555b] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 08/06/2016] [Indexed: 11/26/2022] Open
Abstract
Formation and dispersion of metal nanoparticles on oxide surfaces in site-specific or even arrayed configuration are key in various technological processes such as catalysis, photonics, electrochemistry and for fabricating electrodes, sensors, memory devices, and magnetic, optical, and plasmonic platforms. A crucial aspect towards an efficient performance of many of these metal/metal oxide arrangements is a reliable fabrication approach. Since the early works on graphoepitaxy in the 70s, solid state dewetting of metal films on patterned surfaces has been much explored and regarded as a most effective tool to form defined arrays of ordered metal particles on a desired substrate. While templated dewetting has been studied in detail, particularly from a mechanistic perspective on lithographically patterned Si surfaces, the resulting outstanding potential of its applications on metal oxide semiconductors, such as titania, has received only limited attention. In this perspective we illustrate how dewetting and particularly templated dewetting can be used to fabricate highly efficient metal/TiO2 photocatalyst assemblies e.g. for green hydrogen evolution. A remarkable advantage is that the synthesis of such photocatalysts is completely based on self-ordering principles: anodic self-organized TiO2 nanotube arrays that self-align to a highest degree of hexagonal ordering are an ideal topographical substrate for a second self-ordering process, that is, templated-dewetting of sputter-deposited metal thin films. The controllable metal/semiconductor coupling delivers intriguing features and functionalities. We review concepts inherent to dewetting and particularly templated dewetting, and outline a series of effective tools that can be synergistically interlaced to reach fine control with nanoscopic precision over the resulting metal/TiO2 structures (in terms of e.g. high ordering, size distribution, site specific placement, alloy formation) to maximize their photocatalytic efficiency. These processes are easy to scale up and have a high throughput and great potential to be applied to fabricate not only (photo)catalytic materials but also a large palette of other functional nanostructured elements and devices.
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Affiliation(s)
- Marco Altomare
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
| | - Nhat Truong Nguyen
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
| | - Patrik Schmuki
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
- Chemistry Department , Faculty of Sciences , King Abdulaziz University , 80203 Jeddah , Kingdom of Saudi Arabia
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389
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Transient Relaxations of Ionic Conductance during Growth of Porous Anodic Alumina Films: Electrochemical Impedance Spectroscopy and Current Step Experiments. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.11.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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390
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Zhou X, Licklederer M, Schmuki P. Thin MoS2 on TiO2 nanotube layers: An efficient co-catalyst/harvesting system for photocatalytic H2 evolution. Electrochem commun 2016. [DOI: 10.1016/j.elecom.2016.10.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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391
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Badets V, Loget G, Garrigue P, Sojic N, Zigah D. Combined local anodization of titanium and scanning photoelectrochemical mapping of TiO2 spot arrays. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.151] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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392
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Akimov AV. Nonadiabatic Molecular Dynamics with Tight-Binding Fragment Molecular Orbitals. J Chem Theory Comput 2016; 12:5719-5736. [DOI: 10.1021/acs.jctc.6b00955] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Alexey V. Akimov
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
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393
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Yu Y, Sun D, Wang H, Wang H. Electrochemical Properties of Rutile TiO 2 Nanorod Array in Lithium Hydroxide Solution. NANOSCALE RESEARCH LETTERS 2016; 11:448. [PMID: 27709562 PMCID: PMC5052156 DOI: 10.1186/s11671-016-1662-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 09/26/2016] [Indexed: 06/01/2023]
Abstract
In this paper, rutile TiO2 nanorod arrays are fabricated by a template-free method and proposed as a promising anode for aqueous Li-ion battery. The as-prepared TiO2 nanorod arrays exhibited reversible Li-ion insertion/extraction ability in aqueous LiOH electrolyte. Moreover, galvanostatic charge/discharge test results demonstrated that the reversible capacity of TiO2 nanorods could reach about 39.7 mC cm-2, and 93.8 % of initial capacity was maintained after 600 cycles at a current density of 1 mA cm-2 (=240 C rate), indicating excellent cycling stability and rate capability.
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Affiliation(s)
- Yan Yu
- Suzhou Polytechnic Institute of Agriculture, Suzhou, Jiangsu 215008 People’s Republic of China
| | - Dan Sun
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 People’s Republic of China
| | - Haibo Wang
- Institute of Chemical Power Sources & College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, Jiangsu 215006 People’s Republic of China
| | - Haiyan Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 People’s Republic of China
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394
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Use of High-Voltage Cyclic Voltammetry to Characterize Bulk and Interfacial Conduction Processes in Anodic Alumina Films. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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395
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Activity of vancomycin release from bioinspired coatings of hydroxyapatite or TiO 2 nanotubes. Int J Pharm 2016; 517:296-302. [PMID: 27913240 DOI: 10.1016/j.ijpharm.2016.11.062] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 11/27/2016] [Accepted: 11/29/2016] [Indexed: 11/22/2022]
Abstract
Herein we investigate the efficiency of various biomimetic coatings for localized drug delivery, using vancomycin as key therapeutic drug, which is a widely used antibiotic for the treatment of strong infections caused by positive Gram bacteria. We evaluate classical hydroxyapatite and biomimetic hydroxyapatite-collagen coatings obtained by electrochemical deposition as well as TiO2 nanotubes arrays obtained by electrochemical anodization. Surface morphology, compositional and structural data confirm the incorporation of vancomycin into the layers and drug release profiles for vancomycin evaluate their release ability. Namely, hydroxyapatite coatings lead to a ≈92% vancomycin release after 30h and hydroxyapatite-collagen to 85%, while the TiO2 nanotubes layers lead to 78% release. The antibacterial effect of such drug loaded coatings is evaluated against S. aureus (Gram-positive bacteria). Our study shows that the vancomycin incorporated hydroxyapatite coatings lead to a faster release, while the nanotubular coatings may lead to longer time release and additionally both types of coatings ensure a good antibacterial inhibition.
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396
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Lee S, Park B, Kim JS, Kim TI. Designs and processes toward high-aspect-ratio nanostructures at the deep nanoscale: unconventional nanolithography and its applications. NANOTECHNOLOGY 2016; 27:474001. [PMID: 27775918 DOI: 10.1088/0957-4484/27/47/474001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The patterning of high-resolution-featured deep-nanoscale structures with a high aspect ratio (AR) has received increasing attention in recent years as a promising technique for a wide range of applications, including electrical, optical, mechanical and biological systems. Despite extensive efforts to develop viable nanostructure fabrication processes, a superior technique enabling defect-free, high-resolution control over a large area is still required. In this review, we focus on recent important advances in the designs and processes of high-resolution nanostructures possessing a high AR, including hierarchical and 3D patterns. The unique applications of these materials are also discussed.
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Affiliation(s)
- Sori Lee
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 440-746, Korea
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397
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Riboni F, Nguyen NT, So S, Schmuki P. Aligned metal oxide nanotube arrays: key-aspects of anodic TiO 2 nanotube formation and properties. NANOSCALE HORIZONS 2016; 1:445-466. [PMID: 32260709 DOI: 10.1039/c6nh00054a] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Over the past ten years, self-aligned TiO2 nanotubes have attracted tremendous scientific and technological interest due to their anticipated impact on energy conversion, environment remediation and biocompatibility. In the present manuscript, we review fundamental principles that govern the self-organized initiation of anodic TiO2 nanotubes. We start with the fundamental question: why is self-organization taking place? We illustrate the inherent key mechanistic aspects that lead to tube growth in various different morphologies, such as ripple-walled tubes, smooth tubes, stacks and bamboo-type tubes, and importantly the formation of double-walled TiO2 nanotubes versus single-walled tubes, and the drastic difference in their physical and chemical properties. We show how both double- and single-walled tube layers can be detached from the metallic substrate and exploited for the preparation of robust self-standing membranes. Finally, we show how by selecting specific growth approaches to TiO2 nanotubes desired functional features can be significantly improved, e.g., enhanced electron mobility, intrinsic doping, or crystallization into pure anatase at high temperatures can be achieved. Finally, we briefly outline the impact of property, modifications and morphology on functional uses of self-organized nanotubes for most important applications.
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Affiliation(s)
- Francesca Riboni
- Department of Materials Science WW4-LKO, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany.
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398
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Singh P, Ojha A, Borthakur A, Singh R, Lahiry D, Tiwary D, Mishra PK. Emerging trends in photodegradation of petrochemical wastes: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:22340-22364. [PMID: 27566154 DOI: 10.1007/s11356-016-7373-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Various human activities like mining and extraction of mineral oils have been used for the modernization of society and well-beings. However, the by-products such as petrochemical wastes generated from such industries are carcinogenic and toxic, which had increased environmental pollution and risks to human health several folds. Various methods such as physical, chemical and biological methods have been used to degrade these pollutants from wastewater. Advance oxidation processes (AOPs) are evolving techniques for efficient sequestration of chemically stable and less biodegradable organic pollutants. In the present review, photocatalytic degradation of petrochemical wastes containing monoaromatic and poly-aromatic hydrocarbons has been studied using various heterogeneous photocatalysts (such as TiO2, ZnO and CdS. The present article seeks to offer a scientific and technical overview of the current trend in the use of the photocatalyst for remediation and degradation of petrochemical waste depending upon the recent advances in photodegradation of petrochemical research using bibliometric analysis. We further outlined the effect of various heterogeneous catalysts and their ecotoxicity, various degradation pathways of petrochemical wastes, the key regulatory parameters and the reactors used. A critical analysis of the available literature revealed that TiO2 is widely reported in the degradation processes along with other semiconductors/nanomaterials in visible and UV light irradiation. Further, various degradation studies have been carried out at laboratory scale in the presence of UV light. However, further elaborative research is needed for successful application of the laboratory scale techniques to pilot-scale operation and to develop environmental friendly catalysts which support the sustainable treatment technology with the "zero concept" of industrial wastewater. Nevertheless, there is a need to develop more effective methods which consume less energy and are more efficient in pilot scale for the demineralization of pollutant.
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Affiliation(s)
- Pardeep Singh
- Department of Chemistry, Indian Institute of Technology (IIT-BHU), Varanasi, 221005, India.
- Department of Environmental Studies, PGDAV College, University of Delhi, New Delhi, 110068, India.
| | - Ankita Ojha
- Department of Chemistry, Indian Institute of Technology (IIT-BHU), Varanasi, 221005, India
| | - Anwesha Borthakur
- Centre for Studies in Science Policy, Jawaharlal Nehru University (JNU), New Delhi, 110067, India
| | - Rishikesh Singh
- Institute of Environment and Sustainable Development (IESD), Banaras Hindu University, Varanasi, 221005, India
| | - D Lahiry
- Rajghat Education Centre, KFI, Varanasi, 221005, India
| | - Dhanesh Tiwary
- Department of Chemistry, Indian Institute of Technology (IIT-BHU), Varanasi, 221005, India
| | - Pradeep Kumar Mishra
- Department of Chemical Engineering and Technology, Indian Institute of Technology (IIT-BHU), Varanasi, 221005, India
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399
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Imani R, Pazoki M, Zupančič D, Kreft ME, Kralj-Iglič V, Veranič P, Iglič A. Biocompatibility of different nanostructured TiO 2 scaffolds and their potential for urologic applications. PROTOPLASMA 2016; 253:1439-1447. [PMID: 26497540 DOI: 10.1007/s00709-015-0896-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
Despite great efforts in tissue engineering of the ureter, urinary bladder, and urethra, further research is needed in order to improve the patient's quality of life and minimize the economic burden of different lower urinary tract disorders. The nanostructured titanium dioxide (TiO2) scaffolds have a wide range of clinical applications and are already widely used in orthopedic or dental medicine. The current study was conducted to synthesize TiO2 nanotubes by the anodization method and TiO2 nanowires and nanospheres by the chemical vapor deposition method. These scaffolds were characterized with scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. In order to test the urologic applicability of generated TiO2 scaffolds, we seeded the normal porcine urothelial (NPU) cells on TiO2 nanotubes, TiO2 nanowires, TiO2 nanospheres, and on the standard porous membrane. The viability and growth of the cells were monitored everyday, and after 3 weeks of culturing, the analysis with scanning electron microscope (SEM) was performed. Our results showed that the NPU cells were attached on all scaffolds; they were viable and formed a multilayered epithelium, i.e., urothelium. The apical plasma membrane of the majority of superficial NPU cells, grown on all three different TiO2 scaffolds and on the porous membrane, exhibited microvilli; thus, indicating that they were at a similar differentiation stage. The maximal caliper diameter measurements of superficial NPU cells revealed significant alterations, with the largest cells being observed on nanowires and the smallest ones on the porous membrane. Our findings indicate that different nanostructured TiO2 scaffolds, especially nanowires, have a great potential for tissue engineering and should be further investigated for various urologic applications.
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Affiliation(s)
- Roghayeh Imani
- Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana, Slovenia
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Zdravstvena 5, Ljubljana, Slovenia
| | - Meysam Pazoki
- Department of Chemistry, Ångström Laboratory, Physical Chemistry, Uppsala University, Box 523, SE 75120, Uppsala, Sweden
| | - Daša Zupančič
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, Ljubljana, Slovenia
| | - Mateja Erdani Kreft
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, Ljubljana, Slovenia
| | - Veronika Kralj-Iglič
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, Zdravstvena 5, Ljubljana, Slovenia
| | - Peter Veranič
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Vrazov trg 2, Ljubljana, Slovenia
| | - Aleš Iglič
- Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, Ljubljana, Slovenia.
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400
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Kulkarni M, Mazare A, Park J, Gongadze E, Killian MS, Kralj S, von der Mark K, Iglič A, Schmuki P. Protein interactions with layers of TiO 2 nanotube and nanopore arrays: Morphology and surface charge influence. Acta Biomater 2016; 45:357-366. [PMID: 27581395 DOI: 10.1016/j.actbio.2016.08.050] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 08/09/2016] [Accepted: 08/26/2016] [Indexed: 11/27/2022]
Abstract
In the present work we investigate the key factors involved in the interaction of small-sized charged proteins with TiO2 nanostructures, i.e. albumin (negatively charged), histone (positively charged). We examine anodic nanotubes with specific morphology (simultaneous control over diameter and length, e.g. diameter - 15, 50 or 100nm, length - 250nm up to 10μm) and nanopores. The nanostructures surface area has a direct influence on the amount of bound protein, nonetheless the protein physical properties as electric charge and size (in relation to nanotopography and biomaterial's electric charge) are crucial too. The highest quantity of adsorbed protein is registered for histone, for 100nm diameter nanotubes (10μm length) while higher values are registered for 15nm diameter nanotubes when normalizing protein adsorption to nanostructures' surface unit area (evaluated from dye desorption measurements) - consistent with theoretical considerations. The proteins presence on the nanostructures is evaluated by XPS and ToF-SIMS; additionally, we qualitatively assess their presence along the nanostructures length by ToF-SIMS depth profiles, with decreasing concentration towards the bottom. STATEMENT OF SIGNIFICANCE Surface nanostructuring of titanium biomedical devices with TiO2 nanotubes was shown to significantly influence the adhesion, proliferation and differentiation of mesenchymal stem cells (and other cells too). A high level of control over the nanoscale topography and over the surface area of such 1D nanostructures enables a direct influence on protein adhesion. Herein, we investigate and show how the nanostructure morphology (nanotube diameter and length) influences the interactions with small-sized charged proteins, using as model proteins bovine serum albumin (negatively charged) and histone (positively charged). We show that the protein charge strongly influences their adhesion to the TiO2 nanostructures. Protein adhesion is quantified by ELISA measurements and determination of the nanostructures' total surface area. We use a quantitative surface charge model to describe charge interactions and obtain an increased magnitude of the surface charge density at the top edges of the nanotubes. In addition, we track the proteins presence on and inside the nanostructures. We believe that these aspects are crucial for applications where the incorporation of active molecules such as proteins, drugs, growth factors, etc., into nanotubes is desired.
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