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Tio2 Nanotubes

Xiaofei Qin, Qianqian Wang, Liping Geng, Xiaoli Shu, Yan Wang
An ultrasensitive photoelectrochemical (PEC) aptasensor was designed for detection of chloramphenicol (CAP) based on graphene quantum dots-sensitized TiO2 nanotube arrays (GQDs/TiO2 NTs). The GQDs/TiO2 NTs nanohybrids were prepared by a coupling technique of linker molecule binding and electrophoretic deposition. It exhibited significantly enhanced visible-light photoelectrochemical activity, which was firstly employed as the photoactive material for fabrication of PEC aptasensor. As the recognition unit, the aptamers of CAP were immobilized on GQDs/TiO2 NTs photoelectrode via π-π stacking interaction between GQDs and the nucleobases of the aptamer...
May 15, 2019: Talanta
Jianzhi Dou, Dejie Li, Huijuan Li, Qi Kang, Jianjun Lu, Dazhong Shen
Improvement of the sensitivity and selectivity is important in the development of an analytical method. Herein, we propose a differential photoelectrochemical (PEC) sensor to hydrogen peroxide based on the catalytic activity difference between two zeolitic imidazolate framework (ZIF) surface coatings. In the sensing and reference photoelectrodes, ZIF-67 and ZIF-8 films were grown on the surface of carboxylated carbon nanotubes-graphite-like carbon nitride/TiO2 nanotube array, respectively. The molecular sieve effect of ZIF-8 and ZIF-67 coatings can prevent the diffusion of molecules with size larger than the pores in coating layers (e...
May 15, 2019: Talanta
Alejandro Ansón-Casaos, Cristina Rubio-Muñoz, Javier Hernández-Ferrer, Ana Santidrian, Ana M Benito, Wolfgang K Maser
The transfer of nanoscale properties from single-walled carbon nanotubes (SWCNTs) to macroscopic systems is a topic of intense research. In particular, inorganic composites of SWCNTs and metal oxide semiconductors are being investigated for applications in electronics, energy devices, photocatalysis, and electroanalysis. In this work, a commercial SWCNT material is separated into fractions containing different conformations. The liquid fractions show clear variations in their optical absorbance spectra, indicating differences in the metallic/semiconducting character and the diameter of the SWCNTs...
February 15, 2019: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Raja Bhaskar Kanth Siram, Mark V Khenkin, Angelica Niazov-Elkan, Anoop K M, Haim Weissman, Eugene A Katz, Iris Visoly-Fisher, Boris Rybtchinski
We report on utilizing free-standing hybrid perylenediimide/carbon nanotube (PDI/CNT) films fabricated in air as back contacts for fully inorganic perovskite solar cells (glass/FTO/dense TiO2/mesoporous TiO2/CsPbBr3/back electrode). The back contact electrode connection is performed by film transfer rather than by vacuum deposition or by wet processing, allowing the formation of highly homogeneous contacts under ambient conditions. The use of this novel electrode in solar cells based on CsPbBr3 resulted in efficiency of 5...
February 11, 2019: Nanoscale
Zong-Min Ma, Xing-Sheng Wu, Dou-Dou Zheng, Jiu-Yan Wei, Yan-Na Xie, Yun-Bo Shi, Kun Huang, Xiao-Ming Zhang, Jun Liu
Nowadays, determination of the iron ions with high sensitivity and selectivity with novel methods becomes a matter of urgency for monitoring healthy body and environment. In this paper, for the first time, we present a set of high-performance TiO2 nanotube arrays which are quite sensitive to iron ions. Firstly, the anodic oxidation method was adopted to prepare ordered TiO2 nanotube arrays, followed by functionalized Ag nanoparticle deposition with the enhancement ability in iron ion sensing. Besides, the spectrum of the TiO2 nanotube with/without the Ag nanoparticles was analyzed with an X-ray photoelectron spectrometer, which shows that Ag nanoparticles can effectively reduce the recombination rate of electrons and holes, and increase the conductivity and the charge transfer rate of the electrodes...
February 6, 2019: Nanoscale Research Letters
Sabrina Friebe, Stefan G Mayr
Long-term organotypic culture of adult tissues not only open up possibilities for studying complex structures of explants in vitro, but also can be employed e.g. to investigate pathological changes, their fingerprints on tissue mechanics, as well as the effectiveness of drugs. While conventional culture methods do not allow for survival times of more than a few days, we have demonstrated recently that TiO2 nanotube arrays allow to maintain integrity of numerous tissues, including retina, brain, spline and tonsils, for as long as 2 weeks in vitro...
2019: Biological Procedures Online
Jianfei Lin, Yong Liu, Yongping Liu, Chen Huang, Wenhui Liu, Xihong Mi, Dayong Fan, Fengtao Fan, Huidan Lu, Xiaobo Chen
Improving the separation efficiency of photogenerated electron-hole pairs and the conductivity of electrons to photoanode substrates are critical to achieve high-performance photoelectrochemical (PEC) water splitting. Here, a SnS2 /H-TiO2 /Ti heterojunction photoanode was fabricated with SnS2 nanosheets vertically grown on hydrogen-treated TiO2 (H-TiO2 ) nanotube arrays on a Ti substrate. It showed a significantly enhanced photocurrent of 4.0 mA cm-2 at 1.4 V (vs. reversible hydrogen electrode) under AM 1...
January 14, 2019: ChemSusChem
S Kenmoe, O Lisovski, S Piskunov, Y F Zhukovskii, E Spohr
For rational design and improvement of electronic and optical properties of water-splitting photocatalysts, the ability to control the band edge positions relative to the water redox potentials and the photoresponse as a function of environmental conditions is essential. We combine ab initio molecular dynamics simulations with ab initio many-body theoretical calculations to predict the bandgap and band edge energies, as well as the absorption spectrum of pristine and N- and S-doped TiO2 nanotubes using the DFT+U and G0 W0 approaches...
January 28, 2019: Journal of Chemical Physics
Caiyuan Cai, Meihua Zhao, Zhen Yu, Hongwei Rong, Chaosheng Zhang
Heavy metal(loid)s are toxic and non-biodegradable environmental pollutants. The contamination of sediments with heavy metal(loid)s has attracted increasing attention due to the negative environmental effects of heavy metal(loid)s and the development of new remediation techniques for metal(loid) contaminated sediments. As a result of rapid nanotechnology development, nanomaterials are also being increasingly utilized for the remediation of contaminated sediments due to their excellent capacity of immobilizing/adsorbing metal(loid) ions...
January 16, 2019: Science of the Total Environment
Weilan Zhang, Dongqing Zhang, Yanna Liang
This article gives an overview of nanotechnologies applied in remediation of water contaminated by poly- and perfluoroalkyl substances (PFASs). The use of engineered nanomaterials (ENMs) in physical sorption and photochemical reactions offers a promising solution in PFAS removal because of the high surface area and the associated high reactivities of the ENMs. Modification of carbon nanotubes (CNTs) (e.g., oxidation, applying electrochemical assistance) significantly improves their adsorption rate and capacity for PFASs removal and opens a new door for use of CNTs in environmental remediation...
January 11, 2019: Environmental Pollution
Hongli Zheng, Yumin Ke, Huan Yi, Hong Dai, Dandan Fang, Yanyu Lin, Zhensheng Hong, Xiuhua Li
Herein, a delicate bifunctional reagent regulated ratiometric electrochemiluminescence (ECL) biosensor was developed for the detection of deoxynivalenol (DON) by virtue of the ratio of two ECL signals from Luminol and tris(4,4'-dicarboxylicacid-2,2'-bipyridyl) ruthenium(II) dichloride (Ru(dcbpy)3 2+ ). Initially, surfactant-assisted synthesis of TiO2 mesocrystals dispersing in Nafion and ionic liquid (IL) complex film held great promises in loading Ru(dcbpy)3 2+ and amplifying the ECL signal. Additionally, helical carbon nanotube (HCNTs) with superior specific area and good conductivity emerging as a scaffold not only realized the high fixing of Luminol, ferrocenecarboxylic acid (FCA) and secondary antibody (Ab2 ), but accelerated the electron transfer...
May 1, 2019: Talanta
Jiuying Tian, Yanting Yang, Mingjuan Huang, Chunhong Zhou, Jusheng Lu
A sensitive photoelectrochemical (PEC) biosensor for determination of alkaline phosphatase (ALP) activity was constructed based on a photo-excited electron transfer strategy. Immobilization of CdTe quantum dots (QDs) on TiO2 nanotube arrays (TNAs), addition of iron (III) and adenosine triphosphate (ATP) in turn can effectively adjust the photocurrent response of TNAs under visible light irradiation due to a photo-excited electron transfer process, and alkaline phosphatase (ALP) activity can be determined for its catalysis toward dephosphorylation of ATP...
May 1, 2019: Talanta
Yong Li, Peng Yang, Bin Wang, Zhongqing Liu
Bimetallic phosphides have been attracting increasing attention due to their synergistic effect for improving the hydrogen evolution reaction as compared to monometallic phosphides. In this work, NiCoP modified hybrid electrodes were fabricated by a one-step electrodeposition process with TiO2 nanotube arrays (TNAs) as a carrier. X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy and scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy were used to characterize the physiochemical properties of the samples...
2019: Beilstein Journal of Nanotechnology
Roman V Chernozem, Maria A Surmeneva, Bärbel Krause, Tilo Baumbach, Viktor P Ignatov, Oleg Prymak, Kateryna Loza, Matthias Epple, Franka Ennen-Roth, Alexandra Wittmar, Mathias Ulbricht, Ekaterina A Chudinova, Tomaž Rijavec, Aleš Lapanje, Roman A Surmenev
Herein TiO2 nanotubes (NTs) were fabricated via electrochemical anodization and coated with silver and calcium phosphate (CaP) nanoparticles (NPs) by electrophoretic deposition. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) revealed that Ag and CaP NPs were successfully deposited onto the TiO2 NTs. Using X-ray diffraction, only anatase and Ti were observed after deposition of Ag and CaP NPs. However, X-ray photoelectron spectroscopy (XPS) analysis revealed that the binding energy (BE) of the Ag and CaP NP core levels corresponded to metallic Ag, hydroxyapatite and amorphous calcium phosphate, based on the knowledge that CaP NPs synthesized by precipitation have the nanocrystalline structure of hydroxyapatite...
April 2019: Materials Science & Engineering. C, Materials for Biological Applications
Rong Jin, Xiangdong Ye, Jia Fan, Dechen Jiang, Hong-Yuan Chen
In this letter, in-situ imaging of the photocatalytic activity of titanium dioxide (TiO2) nanotubes for the degradation of an organic pollutant (i.e., Rhodamine B (RhB)) is realized with nanometer resolution using scanning ion conductance microscopy (SICM). Upon illumination, the separated electrons and holes at the nanotubes induce oxidation of RhB to produce the more positively charged Rhodamine 123 (Rh 123), which leads to increased ionic current through the capillary orifice and an elevated apparent altitude in the SICM image...
January 23, 2019: Analytical Chemistry
Wu-Qiang Wu, Yang-Fan Xu, Hong-Yan Chen, Dai-Bin Kuang, Cheng-Yong Su
The utilization of solar energy and the development of its related optoelectronic devices have become more important than ever. Solar cells or photoelectrochemical (PEC) cells that require the design of light harvesting assemblies for efficiently converting solar light into electricity or solar fuels are of particular interest. Semiconductor TiO2 , serving as the photoelectrode for photovoltaic devices (e.g., dye- or quantum dot-sensitized solar cells (DSSCs/QDSSCs) or perovskite solar cells (PSCs)) and PEC cells, has aroused intense research interest owing to its inherent characteristics of wide band gap and promising optical and electrical properties...
January 22, 2019: Accounts of Chemical Research
Wei-Chang Xu, Xiao Dong, Jing-Li Ding, Ji-Chun Liu, Jian-Jun Xu, Yan-Hua Tang, Ying-Ping Yi, Chao Lu, Wei Yang, Jue-Sheng Yang, Yi Gong, Jian-Liang Zhou
Background: Macrophages play important roles in the immune response to, and successful implantation of, biomaterials. Titanium nanotubes are considered promising heart valve stent materials owing to their effects on modulation of macrophage behavior. However, the effects of nanotube-regulated macrophages on endothelial cells, which are essential for stent endothelialization, are unknown. Therefore, in this study we evaluated the inflammatory responses of endothelial cells to titanium nanotubes prepared at different voltages...
2019: International Journal of Nanomedicine
Nagaraj P Shetti, Deepti S Nayak, Shweta J Malode, Raghava Reddy Kakarla, Shyam S Shukla, Tejraj M Aminabhavi
Recent advances to utilize two or more nanoparticles for developing novel sensors with superior sensitivity have spurred advanced detection limits even at low concentrations. In this research, a blend of rutheniumdoped TiO2 (Ru-TiO2 ) nanoparticles and multiwalled carbon nanotubes (MWCNTs) loaded into carbon paste matrix to fabricate a novel Ru-TiO2 /MWCNTs-CPE sensor was used for the detection and quantification of flufenamic acid (FFA) and mefenamic acid (MFA) drugs. The surface morphology of Ru-TiO2 was assessed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and atomic force microscopy (AFM)...
March 21, 2019: Analytica Chimica Acta
Yunha Ryu, Kyoungsik Kim
Herein, we report the fabrication and characterization of a hierarchical TiO2 structure that exhibits reduced surface reflection. The hierarchical structure, which is a moth-eye-shaped array containing nanotubes, was fabricated by dry-etching a TiO2 nanotube layer, by using colloidal lithography. The fabricated structure shows a reduced reflectance, compared with that of non-patterned TiO2 nanotubes. This is because of the graded refractive index of the moth-eye pattern. Furthermore, we investigated the optical properties of gold-decorated moth-eye TiO2 nanotubes and found that the absorption, which was caused by the plasmonic resonance of gold nanostructures, was further enhanced by coupling with the light-trapping effect...
November 26, 2018: Optics Express
Lixia Yang, Yanyan Luo, Liming Yang, Shenglian Luo, Xubiao Luo, Weili Dai, Tingting Li, Yan Luo
Enhancing photocatalytic activity of titanium dioxide (TiO2 ) by efficient charge separation is essential but challenging. Herein, the recombination between photo-generated e--h+ pairs is effectively hindered owing to the "e-bridge" formed between hierarchical TiO2 microspheres and carbon nanotubes (CNTs). The as-prepared three-dimensional TiO2 microspheres covered by intercrossing lamellar crystals are abundant in pores and sharp edges, forming an ideal interface with large surface area and numerous active sites for photocatalysis...
January 9, 2019: Journal of Hazardous Materials
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