Electrical and Proton Conduction Properties of Amorphous TiO2 Nanotubes Fabricated by Electrochemical Anodization

Facile crystallization of titanium oxide (TiO2) nanotubes (NTs), synthesized by electrochemical anodization, with low pressure non-thermal oxygen plasma is reported. The influence of plasma processing conditions on TiO2 NTs crystal structure and morphology was examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). For the first time we report the transition of amorphous TiO2 NTs to anatase and rutile crystal structures upon treatment with highly reactive oxygen plasma. This crystallization process has a strong advantage over the conventional heat treatments as it enables rapid crystallization of the surface. Thus the crystalline structure of NTs is obtained in a few seconds of treatment and it does not disrupt the NTs’ morphology. Such a crystallization approach is especially suitable for medical applications in which stable crystallized nanotubular morphology is desired. The last part of the study thus deals with in vitro biological response of whole blood to the TiO2 NTs. The results indicate that application of such surfaces for blood connecting devices is prospective, as practically no platelet adhesion or activation on crystallized TiO2 NTs surfaces was observed.

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TiO2 Nanotubes Architectures for Solar Energy Conversion

Coatings ◽

10.3390/coatings11080931 ◽

2021 ◽

Vol 11 (8) ◽

pp. 931

Author(s):

Yin Xu ◽

Giovanni Zangari

Keyword(s):

Solar Energy ◽

Tio2 Nanotubes ◽

Fossil Fuels ◽

Photovoltaic Effect ◽

Electric Energy ◽

Chemical Species ◽

Electrochemical Anodization ◽

Science And Engineering ◽

Electric Energy Storage ◽

The Usa

Electromagnetic light from the Sun is the largest source, and the cleanest energy available to us; extensive efforts have been dedicated to developing science and engineering solutions in order to avoid the use of fossil fuels. Solar energy transforms photons into electricity via the photovoltaic effect, generating about 20 GW of energy in the USA in 2020, sufficient to power about 17 million households. However, sunlight is erratic, and technologies to store electric energy storage are unwieldy and relatively expensive. A better solution to store energy and to deliver this energy on demand is storage in chemical bonds: synthesizing fuels such as H2, methane, ethanol, and other chemical species. In this review paper we focus on titania (TiO2) nanotubes grown through electrochemical anodization and various modifications made to them to enhance conversion efficiency; these semiconductors will be used to implement the synthesis of H2 through water splitting. This document reviews selected research efforts on TiO2 that are ongoing in our group in the context of the current efforts worldwide. In addition, this manuscript is enriched by discussing the latest novelties in this field.

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Anodic synthesis of TiO2 nanotubes by step-up voltages

Journal of Composite Materials ◽

10.1177/00219983211023791 ◽

2021 ◽

pp. 002199832110237

Author(s):

V Sivaprakash ◽

R Narayanan

Keyword(s):

Corrosion Resistance ◽

Tio2 Nanotubes ◽

Biomedical Applications ◽

Phase Changes ◽

Electrochemical Anodization ◽

Corrosion Resistant ◽

Anodization Process ◽

Anodic Synthesis ◽

Input Potential

Fabrication of TiO2 nanotubes (NTs) has extensive application properties due to their high corrosion resistant and compatibility with biomedical applications, the synthesis of TiO2 nanotubes over titanium has drawn interest in various fields. The synthesis of TiO2 NTs using novel in-situ step-up voltage conditions in the electrochemical anodization process is recorded in this work. For manufacturing the NTs at 1 hour of anodization, the input potential of 30, 40 and 50 V was selected. With increasing step-up voltage during the anodization process, an improvement in the NTs was observed, favoring corrosion resistance properties. The surface of NTs enhances the structure of the ribs, raising the potential for feedback over time. XRD was used to analyze phase changes, and HR-SEM analyzed surface topography. Impedance tests found that longer NTs improved the corrosion resistance.

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Highly Ordered TiO2 Nanotube Arrays with Engineered Electrochemical Energy Storage Performances

Materials ◽

10.3390/ma14030510 ◽

2021 ◽

Vol 14 (3) ◽

pp. 510

Author(s):

Wangzhu Cao ◽

Kunfeng Chen ◽

Dongfeng Xue

Keyword(s):

Tio2 Nanotubes ◽

Lithium Ion ◽

Tio2 Nanotube Arrays ◽

Tio2 Nanotube ◽

Electrochemical Anodization ◽

Nanotube Arrays ◽

Free Standing ◽

Structured Materials ◽

Self Organized ◽

Binder Free

Nanoscale engineering of regular structured materials is immensely demanded in various scientific areas. In this work, vertically oriented TiO2 nanotube arrays were grown by self-organizing electrochemical anodization. The effects of different fluoride ion concentrations (0.2 and 0.5 wt% NH4F) and different anodization times (2, 5, 10 and 20 h) on the morphology of nanotubes were systematically studied in an organic electrolyte (glycol). The growth mechanisms of amorphous and anatase TiO2 nanotubes were also studied. Under optimized conditions, we obtained TiO2 nanotubes with tube diameters of 70–160 nm and tube lengths of 6.5–45 μm. Serving as free-standing and binder-free electrodes, the kinetic, capacity, and stability performances of TiO2 nanotubes were tested as lithium-ion battery anodes. This work provides a facile strategy for constructing self-organized materials with optimized functionalities for applications.

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Organoamine-Directed Assembly of 5p–4f Heterometallic Cluster Substituted Polyoxometalates: Luminescence and Proton Conduction Properties

Inorganic Chemistry ◽

10.1021/acs.inorgchem.1c02099 ◽

2021 ◽

Author(s):

Hui-Ping Xiao ◽

Rong-Tao Zhang ◽

Zhong Li ◽

Yu-Feng Xie ◽

Min Wang ◽

...

Keyword(s):

Directed Assembly ◽

Proton Conduction ◽

Heterometallic Cluster ◽

Conduction Properties

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Atomistic investigation into the mechanical behaviour of crystalline and amorphous TiO2 nanotubes

RSC Advances ◽

10.1039/c5ra27268h ◽

2016 ◽

Vol 6 (33) ◽

pp. 28121-28129 ◽

Cited By ~ 6

Author(s):

Yanan Xu ◽

Mingchao Wang ◽

Ning Hu ◽

John Bell ◽

Cheng Yan

Keyword(s):

Mechanical Properties ◽

Molecular Dynamics ◽

Titanium Dioxide ◽

Molecular Dynamics Simulations ◽

Mechanical Behaviour ◽

Tio2 Nanotubes ◽

Amorphous Tio2 ◽

Dynamics Simulations

The mechanical properties of titanium dioxide (TiO2) nanotubes are studied based on molecular dynamics simulations.

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Enhanced Visible Light Sensitization of N-Doped TiO2 Nanotubes Containing Ti-Oxynitride Species Fabricated via Electrochemical Anodization of Titanium Nitride

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.8b09762 ◽

2018 ◽

Vol 123 (4) ◽

pp. 2189-2201 ◽

Cited By ~ 5

Author(s):

Andrea Merenda ◽

Akshita Rana ◽

Albert Guirguis ◽

De Ming Zhu ◽

Lingxue Kong ◽

...

Keyword(s):

Visible Light ◽

Titanium Nitride ◽

Tio2 Nanotubes ◽

Electrochemical Anodization ◽

Doped Tio2

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All-Solid-State Lithium Ion Batteries Using Self-Organized TiO2 Nanotubes Grown from Ti-6Al-4V Alloy

Molecules ◽

10.3390/molecules25092121 ◽

2020 ◽

Vol 25 (9) ◽

pp. 2121

Author(s):

Vinsensia Ade Sugiawati ◽

Florence Vacandio ◽

Thierry Djenizian

Keyword(s):

Cyclic Voltammetry ◽

Solid State ◽

Tio2 Nanotubes ◽

Coulombic Efficiency ◽

Lithium Ion ◽

Electrochemical Anodization ◽

Self Organized ◽

Solid State Batteries ◽

One Step ◽

Tio2 Nts

All-solid-state batteries were fabricated by assembling a layer of self-organized TiO2 nanotubes grown on as anode, a thin-film of polymer as an electrolyte and separator, and a layer of composite LiFePO4 as a cathode. The synthesis of self-organized TiO2 NTs from Ti-6Al-4V alloy was carried out via one-step electrochemical anodization in a fluoride ethylene glycol containing electrolytes. The electrodeposition of the polymer electrolyte onto anatase TiO2 NTs was performed by cyclic voltammetry. The anodized Ti-6Al-4V alloys were characterized by scanning electron microscopy and X-ray diffraction. The electrochemical properties of the anodized Ti-6Al-4V alloys were investigated by cyclic voltammetry and chronopotentiometry techniques. The full-cell shows a high first-cycle Coulombic efficiency of 96.8% with a capacity retention of 97.4% after 50 cycles and delivers a stable discharge capacity of 63 μAh cm−2 μm−1 (119 mAh g−1) at a kinetic rate of C/10.

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Optical and Electrical Properties of TiO2 Nanotubes Grown by Titanium Anodization

MRS Proceedings ◽

10.1557/proc-1178-aa09-27 ◽

2009 ◽

Vol 1178 ◽

Cited By ~ 1

Author(s):

Yahya Alivov ◽

Vladimir Kuryatkov ◽

Mahesh Pandikunta ◽

Gautam Rajanna ◽

Daniel Johnstone ◽

...

Keyword(s):

Optical Properties ◽

Electrical Properties ◽

Tio2 Nanotubes ◽

Anatase Phase ◽

Rutile Phase ◽

Electrochemical Anodization ◽

Voltage Range ◽

Wide Range ◽

Transient Spectroscopy ◽

Tio2 Nts

AbstractIn this work we investigated the structural, electrical, and optical properties of titanium dioxide (TiO2) nanotubes (NTs) formed by electrochemical anodization of Ti metal sheets in NH4F+glycerol electrolyte at different anodization voltages (Va) and acid concentrations. Our results revealed that TiO2 NTs can be grown in a wide range of anodization voltages from 10 V to 240 V. The maximum NH4F acid concentration, at which NTs can be formed, decreases with the anodization voltage, which is 0.7% for Va<60V, and decreases to 0.1% at Va =240 V. Glancing angle X-ray diffraction (GAXRD) experiments show that as-grown amorphous TiO2 transforms to anatase phase after annealing at 400 oC, and further transforms to rutile phase at annealing temperatures above 500 oC. Samples grown in 30-120 voltage range have higher crystal quality as seen from anatase (101) peak intensity and reduced linewidth. The electrical resistivity of the NTs varies with Va concentration and increases by eight orders of magnitude when Va increases from 10 V to 240 V. This is consistent with cathodoluminescense studies which showed improved optical properties for samples grown in this voltage range. Optical properties of samples were also studied by low temperature photoluminescence. Temperature dependent I-V and photo-induced current transient spectroscopy were employed to analyze electrical properties and defect structure on NT samples.

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