scholarly journals Dual Use of Copper-Modified TiO2 Nanotube Arrays as Material for Photocatalytic NH3 Degradation and Relative Humidity Sensing

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1500
Author(s):  
Tihana Čižmar ◽  
Ivana Grčić ◽  
Mario Bohač ◽  
Marta Razum ◽  
Luka Pavić ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Ammonia Oxidation ◽  
Direct Consequence ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Oh Radicals ◽  
Impregnation Method ◽  
Humidity Sensing ◽  
X Ray

In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The TiO2 nanotube arrays were obtained by anodization of the titanium layer prepared using radio frequency magnetron sputtering (RFMS) and modified with different copper concentrations (0.5, 1, 1.5, and 2 M) by a wet-impregnation method. The sample modified with 2 M Cu(NO3)2 solution showed the highest efficiency for the NH3 photocatalytic degradation and the most pronounced humidity response in comparison to the other studied samples. In order to investigate the structure and impact of Cu modification, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) were used. The photocatalytic activity and the kinetic study of ammonia oxidation were studied in a mini-photocatalytic wind tunnel reactor (MWPT), while relative humidity sensing was examined by impedance spectroscopy (IS). Higher NH3 oxidation was a direct consequence of the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation, which is correlated with the increase in the DC conductivity.

Electronic structure of TiO2 nanotube arrays from X-ray absorption near edge structure studies

2009 ◽  
Vol 19 (37) ◽  
pp. 6804 ◽  
Author(s):  
J. G. Zhou ◽  
H. T. Fang ◽  
J. M. Maley ◽  
M. W. Murphy ◽  
J. Y. Peter Ko ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Edge Structure ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Vertically Aligned Binder-Free TiO2 Nanotube Arrays Doped with Fe, S and Fe-S for Li-ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2924
Author(s):  
Suriyakumar Dasarathan ◽  
Mukarram Ali ◽  
Tai-Jong Jung ◽  
Junghwan Sung ◽  
Yoon-Cheol Ha ◽  
...  
Keyword(s):  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Electrochemical Anodization ◽  
Nanotube Arrays ◽  
Kinetic Properties ◽  
Outer Diameter ◽  
Impregnation Method ◽  
Binder Free ◽  
Vertically Aligned ◽  
Discharge Capacities

Vertically aligned Fe, S, and Fe-S doped anatase TiO2 nanotube arrays are prepared by an electrochemical anodization process using an organic electrolyte in which lactic acid is added as an additive. In the electrolyte, highly ordered TiO2 nanotube layers with greater thickness of 12 μm, inner diameter of approx. 90 nm and outer diameter of approx. 170 nm are successfully obtained. Doping of Fe, S, and Fe-S via simple wet impregnation method substituted Ti and O sites with Fe and S, which leads to enhance the rate performance at high discharge C-rates. Discharge capacities of TiO2 tubes increased from 0.13 mAh cm−2(bare) to 0.28 mAh cm−2 for Fe-S doped TiO2 at 0.5 C after 100 cycles with exceptional capacity retention of 85 % after 100 cycles. Owing to the enhancement of thermodynamic and kinetic properties by doping of Fe-S, Li-diffusion increased resulting in remarkable discharge capacities of 0.27 mAh cm−2 and 0.16 mAh cm−2 at 10 C, and 30 C, respectively.

scholarly journals Preparation of Gd-Doped TiO2 Nanotube Arrays by Anodization Method and Its Photocatalytic Activity for Methyl Orange Degradation

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 298 ◽  
Author(s):  
Rui Li ◽  
Jin Yang ◽  
Shiyin Xu ◽  
Yushun Zhou ◽  
Xuan Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Foil Surface ◽  
Optical Contact ◽  
Doped Tio2 ◽  
X Ray

Gd-doped TiO2 nanotube arrays with 3D ordered and high specific surface (176 m2/g) area are successfully prepared on a Ti foil surface via an anodizing method. The characterizations of Gd-doped TiO2 nanotube arrays are carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectrometer (EDX), optical contact angle measurer, and ultraviolet (UV) fluorescence spectrophotometer, respectively. The results reveal that the Gd-doped TiO2 nanotube arrays form on the Ti foil surface with a length of about 50.5 μm and 100 nm in diameter, and the growth direction grown along the (101) direction of anatase crystal. Under the optimized reaction conditions (60 V, 10 h, 0.01mol/L Gd3+), the crystal phase of Gd-doped TiO2 show an excellent nanotube structure, possess a beneficial photocatalytic performance for methyl orange (MO) (Degradation rate was 95.8%) and an excellent hydrophilic property (The optical contact angle was 4.9°). After doping with Gd, the hydrophilic and photocatalytic properties of the TiO2 nanotubes are further improved.

Study on Photocatalytic Degradation of X-3B by TiO2 Nanotube Arrays

2011 ◽  
Vol 110-116 ◽  
pp. 1417-1422
Author(s):  
Fei Rong ◽  
Jia Liu ◽  
Zhi Juan Zhang ◽  
De Gang Fu
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Direct Photolysis ◽  
Nanotube Array ◽  
X Ray ◽  
One Step ◽  
Titanium Foils ◽  
Better Than

In the present work, highly ordered TiO2 nanotube array with diameter were fabricated by one-step or two-step anodization of titanium foils. The prepared arrays were characterized by field-emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectroscopy (EDX). The photocatalytic activity of the TiO2 nanotube arrays was determined by degradation of X-3B under UV and compared to direct photolysis. The results showed that its photocatalytic activity in degradation of X-3B had been dramatically enhanced as compared to direct photolysis, and the photocatalytic performance of TiO2 nanotube arrays prepared by one-step anodization was better than that made by two-step anodization. Furthermore, adsorption performance analysis suggested that the higher catalytic activity of one-step nanotube array was attributed to its larger apparent maximum number.

Observation of lithiation-induced structural variations in TiO2 nanotube arrays by X-ray absorption fine structure

2015 ◽  
Vol 3 (1) ◽  
pp. 412-419 ◽  
Author(s):  
Dongniu Wang ◽  
Lijia Liu ◽  
Xueliang Sun ◽  
Tsun-Kong Sham
Keyword(s):  
Fine Structure ◽  
Structural Variation ◽  
Structure Study ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Structural Variations ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

A detailed X-ray absorption fine structure study on amorphous and anatase TiO2 nanotube arrays reveals the structural variation in titanate framework and lithium arrangement during the lithiation process.

scholarly journals Effect of Deposition Time of Mn on Photoelectrochemical Properties of Mn/TiO2 Nanotubes

2019 ◽  
Vol 7 (4.14) ◽  
pp. 454
Author(s):  
Asmaa Kadim Ayal ◽  
Ahlam Mohammed Farhan ◽  
Ying-Chin Lim
Keyword(s):  
Deposition Time ◽  
Diffuse Reflectance Spectroscopy ◽  
Photocurrent Density ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Electron Hole ◽  
X Ray ◽  
Light Region ◽  
Tio2 Ntas

Coupling of TiO2 nanotube arrays (NTAs) with narrow band gap materials has been a promising strategy to extend the absorption of TiO2 into visible light region. In this work, the fabrication of manganese doped TiO2 nanotube arrays (Mn/TiO2 NTAs) was carried out by an electrodeposition method. The deposition time of Mn onto TiO2 NTAs which was varied in the range of 1-5 minutes was found to play an important role in controlling the formation and distribution of Mn nanoparticles onto TiO2 NTAs. The films were characterized by field emission scanning electron microscopy (FESEM), X-ray diffractometry (XRD), energy dispersive X-ray spectroscopy (EDX) and UV–vis diffuse reflectance spectroscopy to determine their morphology, crystalline structure, and optical properties of the samples. The results from FESEM showed that Mn nanoparticles were found to grow larger and cause blockage to the mouth of the nanotubes with prolongs deposition time. On the other hand, Mn/TiO2 NTAs synthesized with shorter deposition time exhibits significant enhancements in the optical absorption and photocurrent density. In particular, the Mn/TiO2 NTAs produced at 1minute deposition time exhibited the highest photocurrent density compared to the others. The uniform distribution and quantity of the Mn could be the reason for this performance, therefore, more light was absorbed and generating more electron-hole pairs then giving the highest photocurrent. 

Fabrication and Photocatalytic Activities of TiO2 Nanotube Arrays

2012 ◽  
Vol 460 ◽  
pp. 151-154
Author(s):  
Ya Fang Tu ◽  
Qiu Ming Fu ◽  
Xiao Juan Niu ◽  
Jian Ping Sang ◽  
Zhi Jie Tan ◽  
...  
Keyword(s):  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Liquid Phase Deposition ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Photocatalytic Activities ◽  
Scanning Electron

TiO2 nanotube arrays were prepared using template-based liquid phase deposition method. Their morphologies and structures were investigated by scanning electron micro¬scopy, transmission electron microscopy and X-ray diffraction. The photocatalytic properties of the samples were evaluated with the degradation of methylene blue under UV irradiation. It was found that the TiO2 nanotube arrays annealed at 900 °C showed the highest photocatalytic activity.

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