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Tio2 Nanotubes

Lifang Fan, Caiyun Zhang, Huijie Shi, Guohua Zhao
In view of the urgent need of determining polychlorinated biphenyls in the environment, we developed a highly sensitive and selective photoelectrochemical (PEC) aptasensor for determination of 3,3',4,4'-tetrachlorobiphenyl (PCB77) by immobilizing aptamer on N-doped TiO2 nanotubes (N-doped TiO2 NTs). To improve analytical performance of the PEC sensor, the complementary DNA functionalized CdS quantum dots (DNA-CdS QDs) were introduced onto N-doped TiO2 NTs by hybridization. In addition of PCB77, owing to high affinity of aptamer to PCB77, PCB77-aptamer complexes were formed by being bound of PCB77 whilst DNA-CdS QDs were released from the sensing surface...
September 15, 2018: Biosensors & Bioelectronics
Liping Wang, Jingru Guo, Jingjing Dang, Xiaojun Huang, Si Chen, Weisheng Guan
To enhance the photocatalytic degradation efficiency of TiO2 on methyl orange (MO) removal, TiO2 /AC (activated carbon) and TiO2 /CNT (carbon nanotube) composites were synthesized. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The photocatalytic performance of the obtained composites were investigated by the degradation of MO under UV irradiation (254 nm, 365 nm). The results revealed that the prepared nanocomposite showed higher MO degradation efficiency than pure nano-TiO2 ...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Shahrzad Abdolmohammadi
AIM AND OBJECTIVE: Results of pharmacological studies have revealed that chromenes (2H-1-benzopyran derivatives) and xanthenes (dibenzopyrans) constitute major classes of heterocyclic compounds, due to their useful biological activities. Moreover, during the last decade, the use of metal oxide nanoparticles (NPs) as heterogeneous catalysts has been extensively studied due to their high physical and chemical abilities. The aim of the ongoing research was to prove the catalytic efficiency of the synthesized TiO2 NPs supported by carbon nanotubes (TiO2-CNTs) for the preparation of these heterocyclic scaffolds...
October 18, 2018: Combinatorial Chemistry & High Throughput Screening
Tran Hong Huy, Dai Phat Bui, Fei Kang, Ya-Fen Wang, Shou-Heng Liu, Cao Minh Thi, Sheng-Jie You, Gen-Mu Chang, Van Viet Pham
Titania (TiO2 ) as a commercial photocatalyst has been continually struggling due to the limitation of ultraviolet light response and the high recombination rate of photoinduced carriers. The development of heterojunction nanostructures provides great promise to achieve the activation by visible light and suppress the photoinduced electron-hole pairs recombination. Herein, we synthesized a SnO2 and TiO2 nanotube heterojunction (SnO2 /TNT) via a one-step hydrothermal strategy and systematically investigated NO photocatalytic degradation over the SnO2 /TNTs heterojunction under visible light at the parts per billion level...
October 8, 2018: Chemosphere
Selda Ozkan, JeongEun Yoo, Nhat Truong Nguyen, Shiva Mohajernia, Raul Zazpe, Jan Prikryl, Jan M Macak, Patrik Schmuki
In the present work, we report the use of TiO2 nanotube (NT) layers with a regular intertube spacing that are decorated by Pt nanoparticles through the atomic layer deposition (ALD) of Pt. These Pt-decorated spaced (SP) TiO2 NTs are subsequently explored for photocatalytic H2 evolution and are compared to classical close-packed (CP) TiO2 NTs that are also decorated with various amounts of Pt by using ALD. On both tube types, by varying the number of ALD cycles, Pt nanoparticles of different sizes and areal densities are formed, uniformly decorating the inner and outer walls from tube top to tube bottom...
October 2018: ChemistryOpen
Robert Pipes, Amruth Bhargav, Arumugam Manthiram
The lithium - carbon dioxide (Li-CO2) battery has garnered significant interest over the past five years as a next-generation energy storage device. In this letter, we report a nanocomposite of anatase titania nanoparticles (TiO2-NP), carbon nanotubes (CNT), and carbon nanofibers (CNF) as a freestanding gas diffusion cathode (GDC) for Li-CO2 batteries. Nanostructured anatase TiO2 is demonstrated as a low-cost, easy-to-synthesize catalyst for CO2 capture and utilization. With the developed composite electrode, we confirm the successful reversibility of the carbon dioxide reduction reaction (CDRR) and evolution reaction (CDER) at the cathode, and demonstrate improved Li-CO2 cell performance, through a variety of materials and electrochemical characterization techniques...
October 9, 2018: ACS Applied Materials & Interfaces
Mariusz Andrzejczuk, Marcin Rasiński, Agata Roguska, Marcin Pisarek, Malgorzata Lewandowska
To characterize complex, three-dimensional nanostructures, modern microscopy techniques are needed, such as electron tomography and focused ion beam (FIB) sectioning. The aim of this study was to apply these two techniques to characterize TiO2 nanotubes in terms of their size, shape, volume, porosity, geometric surface area, and specific surface area (SSA). For these experiments, titania nanotubes were fabricated by means of the electrochemical oxidation of titanium at a voltage of 20 V for 2 hr followed by heat treatment at 450°C for 3 hr to change the amorphous structure into a crystalline anatase structure...
October 8, 2018: Microscopy Research and Technique
Guoqing Liao, Yuanyuan Zhao, Jialong Duan, Haiwen Yuan, Yudi Wang, Xiya Yang, Benlin He, Qunwei Tang
Perovskite-structured cesium lead bromide (CsPbBr3) halide provides new opportunities for promoting the commercialization of perovskite solar cells (PSC) due to its high carrier mobility and light absorption coefficient as well as remarkable environmental stability at high humidity and high temperatures. Herein, all-carbon electrodes from multi-walled carbon nanotubes (MWCNT) and carbon black (CB) were prepared for all-inorganic CsPbBr3 PSCs with the configuration of FTO/c-TiO2/m-TiO2/CsPbBr3/carbon. The as-prepared electrodes were free of hole-transporting layers and precious metals...
October 3, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Nam-Youl Kim, Gibaek Lee, Jinsub Choi
This paper presents an investigation of anodic TiO2 nanotube arrays (TNAs), with a Co3O4/CuO coating, for lithium-ion batteries (LIBs). The coated TNAs are investigated using various analysis techniques, with the results clearly suggesting that the molar ratio of Co3O4/CuO in the TiO2 nanotubes substantially influences its battery performance. In particular, a cobalt/copper molar ratio of 2:1 on the TNAs (Co2Cu1@TNAs) features the best LIBs anode performance, exhibiting high reversible capacity and enhanced cycling stability...
October 3, 2018: Chemistry: a European Journal
Li Li, Xiaoxiao Zheng, Yuzhen Huang, Lina Zhang, Kang Cui, Yan Zhang, Jinghua Yu
Inspired by well-known "Wheel of Fortune", a rotatable paper-photocontrollable switch (RPPS) to form an addressable paper-based photoelectrochemical (PEC) cyto-sensor for ultra-sensitive detection of cell surface protein was designed. By simply rotating the RPPS, light source can selectively activate desired working zones of the cyto-sensor. To realize high-performance paper-based PEC cyto-sensor, cascaded photoactive interface consisting of neat TiO2 nanotubes arrays, Pt nanoparticles (NPs), and nitrogen-carbon dots was introduced into paper fibers, gaining signal-on PEC state (NTPP for short)...
October 2, 2018: Analytical Chemistry
Longwei Lv, Yunsong Liu, Ping Zhang, Xiangsong Bai, Xiaohan Ma, Yuejun Wang, Hongyi Li, Li Wang, Yongsheng Zhou
Background: Nanotopography directs stem cell fate; however, the underlying mechanisms, especially those at the epigenetic level, remain vague. The TiO2 -nanotube array, a classical example of nanotopography, is a good model to investigate topography-cell interactions because of its good controllability and easy manufacturing process. Previously, we found that a TiO2 -nanotube array with an optimal diameter promoted osteogenic differentiation of human adipose-tissue-derived stem cells (hASCs)...
2018: International Journal of Nanomedicine
Chunyuan Tian, Li Wang, Feng Luan, Xuming Zhuang
In this study, we prepared titanium dioxide nanotube arrays (TiO2 NTs) infilled with graphene quantum dots (GQDs) to create a hybrid structure (GQD/TiO2 NTs) and applied the GQD/TiO2 NTs as an efficient electrochemiluminescence (ECL) emitter in the detection of prostate protein antigen (PSA). The TiO2 NTs were infilled with the GQDs through an impregnation method. The GQD/TiO2 NP composite electrode showed a highly stable ECL, and, when K2 S2 O8 was used as a co-reactant, the ECL intensity increased 6-fold compared with that of a pure TiO2 NT electrode...
January 1, 2019: Talanta
Yufeng Luo, Hengcai Wu, Liang Liu, Qunqing Li, Kaili Jiang, Shoushan Fan, Ju Li, Jiaping Wang
Black phosphorus (BP) is a promising electrode material with high energy density for lithium-ion batteries. However, volumetric expansion of BP upon lithiation leads to rapid capacity fading of the electrode. Herein, BP composite electrodes are prepared by mixing microsized BP particles with carbon nanotubes and Ketjen Black as dual conducting agents, which facilitate construction of stable and conductive networks in the electrodes. An ultrathin TiO2 nanocoating is deposited on the surface of the BP composite electrode by electron-beam evaporation...
September 27, 2018: ACS Applied Materials & Interfaces
Amir Payan, Moslem Fattahi, Behrooz Roozbehani
Background: The aim of present work, was to synthesize the titanium nanoparticles (TNPs) and titanium nanotubes (TNTs) through the hydrothermal method with different precursors including the Titanium(IV) isopropoxide (TTIP) and Titanium(IV) bis(ammonium lactato)dihydroxide (TALH). Methods: TiO2 nanostructures from different titania precursors as heterogeneous photocatalysis via hydrothermal method were synthesized. The as-prepared photocatalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectra, surface area measurements, Fourier transform infrared spectroscopy and field emission scanning electron microscopy...
June 2018: Journal of Environmental Health Science & Engineering
Wencheng Wang, Xiutong Wang, Ning Wang, Xiaobo Ning, Hong Li, Dongzhu Lu, Xiangju Liu, Qichao Zhang, Yanliang Huang
Titanium dioxide (TiO2 ) nanotube arrays coupled with a narrow gap semiconductor-bismuth selenide (Bi2 Se3 )-exhibited remarkable enhancement in the photocathodic protection property for 304 stainless steel under visible light. Bi2 Se3 /TiO2 nanocomposites were successfully synthesized using a simple two-step method, including an electrochemical anodization method for preparing pure TiO2 and a chemical bath deposition method for synthesizing Bi2 Se3 nanoflowers. The morphology and structure of the composite films were studied by scanning electron microscopy, energy dispersion spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction...
September 21, 2018: Nanoscale Research Letters
S Khajoei Gharaei, M Abbasnejad, Ryo Maezono
We performed the electronic structure calculations of Cu-doped TiO2 nanotubes by using density functional theory aided by the Hubbard correction (DFT + U). Relative positions of the sub-bands due to the dopants in the band diagram are examined to see if they are properly located within the redox interval. The doping is found to tune the material to be a possible candidate for the photocatalyst by making the bandgap accommodated within the visible and infrared range of the solar spectrum. Among several possibilities of the dopant positions, we found that only the case with the dopant located at the center of nanotube seems preventing from electron-hole recombinations to achieve desired photocatalytic activity with n-type behavior...
September 21, 2018: Scientific Reports
Nicholas M Briggs, Lawrence Barrett, Evan C Wegener, Leidy V Herrera, Laura A Gomez, Jeffrey T Miller, Steven P Crossley
Catalysts consisting of metal particles supported on reducible oxides exhibit promising activity and selectivity for a variety of current and emerging industrial processes. Enhanced catalytic activity can arise from direct contact between the support and the metal or from metal-induced promoter effects on the oxide. Discovering the source of enhanced catalytic activity and selectivity is challenging, with conflicting arguments often presented based on indirect evidence. Here, we separate the metal from the support by a controlled distance while maintaining the ability to promote defects via the use of carbon nanotube hydrogen highways...
September 20, 2018: Nature Communications
Kranthi Kumar Gangu, Suresh Maddila, Sreekantha B Jonnalagadda
Many technologies were explored to eliminate the harmful pollutants entering water systems and to minimize their impact on environment. In general, photo-catalysis is one of the sustainable techniques with wider applications and semiconductors in particular were efficiently utilized in the photocatalytic degradation of pollutants. Semiconducting materials, such as TiO2 , ZnO, BiO, CdS, and Ag3 PO4 are frequently used as photo-catalysts due to their suggestible band gap and structural properties. The generation of reactive oxygen species such as hydroxyl and superoxide radicals is the crucial factor in degradation of pollutant molecules...
January 1, 2019: Science of the Total Environment
Ruogu Xu, Xiucheng Hu, Xiaolin Yu, Shuangquan Wan, Fan Wu, Jianglin Ouyang, Feilong Deng
Background: Selective laser melting (SLM) titanium is an ideal option to manufacture customized implants with suitable surface modification to improve its bioactivity. The peri-implant soft tissues form a protective tissue barrier for the underlying osseointegration. Therefore, original microrough SLM surfaces should be treated for favorable attachment of surrounding soft tissues. Material and methods: In this study, anodic oxidation (AO) was applied on the microrough SLM titanium substrate to form TiO2 nanotube arrays...
2018: International Journal of Nanomedicine
Qiong Wu, Fengxia Zhang, Huijuan Li, Zhihua Li, Qi Kang, Dazhong Shen
Herein, we report a ratiometric photoelectrochemical (PEC) immunosensor coupled with secondary antibodies-Co3O4 nanoparticle conjugates (Ab2-Co3O4 NPs) for signal amplification. The Ab1-g-C3N4@TiO2 NTs and BSA-g-C3N4@TiO2 NTs act as the sensing and reference photoelectrodes, where Ab1, BSA and TiO2 NTs are the capture antibodies, bovine serum albumin and TiO2 nanotube arrays, respectively. In the presence of target Ag, the sensing PEC photocurrent decreases due to the steric hindrance of Ab1 molecules, which increases the inner resistance of the photoelectrode...
September 19, 2018: Analyst
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