JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 21
·10665-10671
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IF 5.968
Anmin Nie,Jiabin Liu,Qianqian Li,Yingchun Cheng,Cezhou Dong,Wu Zhou,Peng Wang,Qingxiao Wang,Yang Yang,Yihan Zhu,Yuewu Zeng,Hongtao Wang
Taking TiO2/SnO2 core–shell nanowires (NWs) as a model system, we systematically investigate the structure and the morphological evolution of this heterostructure synthesized by atomic layer deposition/epitaxy (ALD/ALE). All characterizations, by X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction and Raman spectra, reveal that single crystalline rutile TiO2 shells can be epitaxially grown on SnO2 NWs with an atomically sharp interface at low temperature (250 °C). The growth behavior of the TiO2 shells highly depends on the surface orientations and the geometrical shape of the core SnO2 NW cross-section. Atomically smooth surfaces are found for growth on the {110} surface. Rough surfaces develop on {100} surfaces due to (100) − (1 × 3) reconstruction, by introducing steps in the [010] direction as a continuation of {110} facets. Lattice mismatch induces superlattice structures in the TiO2 shell and misfit dislocations along the interface. Conformal epitaxial growth has been observed for SnO2 NW cores with an octagonal cross-section ({100} and {110} surfaces). However, for a rectangular core ({10} and {010} surfaces), the shell also derives an octagonal shape from the epitaxial growth, which was explained by a proposed model based on ALD kinetics. The surface steps and defects induced by the lattice mismatch likely lead to improved photoluminescence (PL) performance for the yellow emission. Compared to the pure SnO2 NWs, the PL spectrum of the core–shell nanostructures exhibits a stronger emission peak, which suggests potential applications in optoelectronics.
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高影响因子
ACS Applied Materials & Interfaces
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2015
·
IF 6.723
Shuanglong Ma,Sihui Zhan,Yanan Jia,Qixing Zhou
Fe3O4-TiO2 nanosheets (Fe3O4-TNS) were synthesized by means of lamellar reverse micelles and solvothermal method, which were characterized by TEM, XRD, XPS, BET, and magnetic property analysis. It can be found that Fe3O4-TNS nanosheets exhibited better photocatalytic antibacterial activity toward Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus than pure Fe3O4 and TNS, and the antibacterial efficiency could reach 87.2% and 93.7% toward E. coli and S. aureus with 100 μg/mL Fe3O4-TNS after 2 h of simulated solar light illumination, respectively. The photocatalytic destruction of bacteria was further confirmed by fluorescent-based cell live/dead test and SEM images. It was uncovered that Fe3O4-TNS inactivated G- E. coli and G+ S. aureus by different mechanisms: the destruction of outer membranes and ruptured cell bodies were responsible for the bactericidal effect against E. coli, while the antibacterial effect toward S. aureus were due to the fact that the cells were adsorbed in form of clusters by massive Fe3O4-TNS, which could restrict their activities and cause malfunction of the selective permeable barriers. Furthermore, the antibacterial mechanism was studied by employing scavengers to understand exact roles of different reactive species, indicating the key roles of h+ and H2O2. The recovery and reusability experiments indicated that Fe3O4-TNS still retained more than 90% bacteria removal efficiency even after five cycles. Considering the easy magnetic separation, bulk availability, and high antibacterial activity of Fe3O4-TNS, it is a promising candidate for cleaning the microbial contaminated water environment.
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PubMed
高影响因子
Materials Today Nano
·
2025
·
IF 8.2
Teng Zhou,Daohai Zhang,Kunlan Diao,Jiajia Du,Yupeng Hu,Zhi Lei,Dongju Liu,Shan Liu,Shuhao Qin
With the widespread popularity of digital technology, electromagnetic interference(EMI) has become a new type of pollution that endangers electronic equipment and biological systems. In this paper, MWCNTs@TiO 2 composite materials were prepared by the hydrothermal synthesis method and then added into the three dimensional framework constructed by PAM (polyacrylamide) and PEG (polyethylene glycol) to obtain hydrogels with EMI functionality. It was found that in the M@T/PAM-4 (MWCNTs@TiO 2 /PAM-4) hydrogel, due to the fact that TiO 2 particles were loaded on the surface of MWCNTs, its cross section presented a granular shape. As the content of MWCNTs increased, the EMI SE T of the hydrogel increased, with the M@T/PAM-4 hydrogel reaching 29 dB. The electrical conductivity and mechanical properties also increased accordingly. Compared with the pure PAM hydrogel, they were respectively improved by 626 % and 24.5 %, which was attributed to the formation of a conductive network by MWCNTs and the enhancement of interfacial polarization, etc. Meanwhile, the water retention rate of the M@T/PAM-4 hydrogel could still reach 34.1 % after 8 h. Moreover, it also had a relatively high water content of 69.08 %. Therefore, This improves the application value and development prospects of the hydrogel in fields such as Electromagnetic (EM) shielding.
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CATALYSIS TODAY
·
2016
·
IF 4.312
Peng Sun,Ruiyang Xue,Wang Zhang,Imran Zada,Qinglei Liu,Jiajun Gu,Huilan Su,Zhijian Zhang,Jianzhong Zhang,Di Zhang
Herein TiO 2 coated on glass fiber cloth (TiO 2 /glass fiber cloth, TGFC) was synthesised by sol-gel method. We demonstrated the property about TGFC of photocatalytic decomposition of organic pollutants under ultraviolet-visible (UV–vis) light and sunlight. Glass fiber cloth (GFC) was chosen as the support of TiO 2 in order to improve the practical applications for water purification . TGFC-1–6 were characterized by ERSEM, XRD and XPS. Photocatalytic decomposition of crystal violet (CV) was carried out to investigate the photocatalytic activity of TGFC. The efficiency of TGFC-3 was the best. And its photocatalytic decomposition rate of the second to fifth cycle was higher than the first cycle. The photocatalytic decomposition rate of TGFC-3 was 85% under sunlight from 8:00–14:00. We could design and regulate the shape of TGFC and estimate the area, weight and thickness of TiO 2 , more easily than glass fibers. TGFC is suitable for photocatalytic decomposition of organic pollutants in the water, especially to be fixed in sewage treatment pool and reused.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 1
·333-342
·
IF 2.787
Linhui Yu,Yangming Lin,Jing Huang,Sen Lin,Danzhen Li
Carbon-doped TiO 2 nanomaterials have been successfully synthesized via an effective two-step procedure involving hydrothermal method and followed by a low-temperature calcination treatment process, through which a controllable amount of carbonate-like species could be incorporated into TiO 2 . First-principles calculations suggest the TiO 2 doped with carbon in form of carbonate-like species can effectively extend the adsorption of the material from ultraviolet region to visible light. And it is experimentally found that carbon-doped TiO 2 nanomaterials exhibit much higher photocatalytic activity than reference P25 and TiO 2− x N x catalysts toward the liquid-phase degradation of organic pollutants under visible light (420 nm < λ < 800 nm) irradiation. The presence of synergic effect between carbonate-like doping and anatase TiO 2 is believed to play an essential role in affecting the photocatalytic reactivity, and the response to the visible light is ascribed to the narrowed band gap energy controlled by carbon doping. Moreover, the roles of active species in the photocatalytic process are compared using different types of active species scavengers. Meanwhile, the degradation mechanism of the photocatalysis is proposed. It is hoped that our work could provide valuable information on the design of carbonate-like doped semiconductor with more excellent properties and set the foundation for the further industrial application.
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高影响因子
HYPERFINE INTERACTIONS
·
2016
·Vol. 237
·期 1
·1-8
·
IF 0
Ganeshraja Ayyakannu Sundaram,Nomura Kiyoshi,Wang Junhu
Diluted Sn doped TiO 2 nanocrystals (Sn/Ti ratio: x ≤ 1.37 %) were synthesized by a simple hydrothermal method using pure reagents without any surfactant and dispersant material. The XRD of these samples showed an anatase phase, anatase and rutile mixed phases, and a rutile phase of TiO 2 and SnO 2 with the increase of Sn dopant concentrations. 119 Sn Mössbauer spectra gave the broad peaks, which were decomposed into doublets and sextets because almost all these samples showed magnetic hysteresis even at room temperature. The titanium oxides doped with x ≤ 0.12 % showed the relatively large magnetic hysteresis and high photocatalytic activity. Mössbauer spectra of samples doped with x > 0.3 % were analyzed by one doublet and two sextets although the samples showed weak ferromagnetism. Three kinds of Sn species may be distinguished as Sn 4+ substituted TiO 2 and two different magnetic arrangements of Sn doped TiO 2 : one with more oxygen defects and other at the interface of TiO 2 and precipitated SnO 2 containing Ti atoms. The correlation between various amounts of Sn sites and photocatalytic activity and/ or magnetic property was discussed.
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JOURNAL OF LUMINESCENCE
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2015
·
IF 2.719
Xi Li,Jie Li,Yingchun Li,Kai Xia
8-hydroxyquinoline aluminum/nano-TiO 2 composites were prepared via in situ. In order to make a better combination of the two component, Octavinyl-T8-silsesquioxane (8-vinyl POSS) was introduced into the composite system . The structure and properties of the samples were characterized by XRD , SEM, XPS , UV–visible absorption, Fluorescence spectra and Time-resolved emission-decay. These results show both β-phase and γ-phase of Alq 3 exist in the composite products. Meanwhile, the addition of nano-TiO 2 and 8-vinyl POSS does not change the crystalline and structure of as-prepared Alq 3 . Interestingly, however, XPS spectra shows that two new kinds of interaction forces emerge after the addition of 8-vinyl POSS, owing to the formation of Al–O–Si and Si–O–Ti bond, presumably. Besides, the emission intensity of Alq 3 /nano-TiO 2 and Alq 3 /8-vinyl POSS/nano-TiO 2 increases by 22% and 33%, respectively. The addition of TiO 2 and 8-vinly POSS will not affect the position of emission peak, but will increase the transmission efficiency in electron–hole pairs. In the meantime, surprisingly, the modified Alq 3 has a longer lifetime than as-prepared Alq 3 .
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高影响因子
Acta Biomaterialia
·
2015
·
IF 6.025
Kui Cheng,Yu Sun,Hongping Wan,Xiaozhao Wang,Wenjian Weng,Jun Lin,Huiming Wang
Anatase TiO 2 nanodot films have been found to be able to release cells under light illumination with excellent efficiency and safety. In the present study, we investigated the effects of rutile contents in TiO 2 nanodot films on such light induced cell detachment behavior. The results showed that TiO 2 nanodot films with different contents of rutile phase have been prepared successfully. The content of rutile phase increased with the increase in calcination temperature. All films possessed good cell adhesion but there was a decrease in cell proliferation with the increasing content of rutile phase. Single cell detachment assay showed that the films with high rutile contents (calcined at 900 °C and 1100 °C) showed better cell detachment performance. That was ascribed to the changes of the secondary structure of extracellular proteins adsorbed on the nanodot surface after ultraviolet (365 nm, UV365) illumination. In addition, cell sheets detached through UV365 illumination maintained high activity and could be further used in tissue engineering. The present work showed that the existence of rutile phase is helpful in cell detachment behavior and it could be utilized to optimize light-induced cell detachment behavior. Statement of Significance This work discovers that the presence of rutile phase in TiO 2 nanodot films could improve the light-induced cell detachment behavior, although rutile phase is inferior to anatase phase on light induced superhydrophilicity. That strongly supported that the behaviors of adsorbed proteins are crucial in acquiring cell sheet with light illumination. In fact, the state and behavior of adsorbed protein greatly affect the interaction between biomaterials and living cells. Therefore, we consider this work is not only important in harvesting cells or cell sheets through light illumination, but also helpful in further understanding of interaction between biomaterials and cells.
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PubMed
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Xianqiang Xiong,Haihang Chen,Yiming Xu
Various methods that aim to improve the photocatalytic activity of TiO2 have been reported in the literature. Herein, we report that addition of CuWO4 into the aqueous suspension of TiO2 can result in significant enhancement in the rate of phenol degradation. As the amount of CuWO4 increased, the rate of phenol degradation increased and then decreased. A maximum rate of phenol degradation observed with 2 wt % CuWO4 was about 2.83 times that in the absence of CuWO4. A similar result was also observed with CuO. However, six consecutive tests showed that CuWO4/TiO2 was much more stable than CuO/TiO2, due to the very high stability of CuWO4 against photocorrosion. The improved activity of TiO2 is not due to CuWO4 and CuO themselves and also does not match their solubility in aqueous solution. Moreover, for the generation of OH radicals, and for the decomposition of H2O2 in aqueous solution, CuWO4/TiO2 was also more active than TiO2. Through a (photo) electrochemical measurement, a possible mechanism is proposed, involving electron transfer from the irradiated TiO2 to CuWO4 that facilitates the charge separation of TiO2 and consequently accelerates reactions at interfaces.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Yupeng Gao,Libo Wang,Aiguo Zhou,Zhengyang Li,Jingkuo Chen,Hari Bala,Qianku Hu,Xinxin Cao
TiO 2 /Ti 3 C 2 nanocomposites with high photocatalytic activity were successfully fabricated via a hydrothermal process. The microstructure and phase composition of these composites were characterized by field emission scanning electron microscope (FESEM) and X-ray diffraction (XRD). The photocatalytic performance of pure TiO 2 and TiO 2 /Ti 3 C 2 nanocomposites were evaluated by photodegradation of methyl orange (MO) under ultraviolet light irradiation. Photodegradation tests results revealed that TiO 2 /Ti 3 C 2 have much better photocatalytic activity than pure TiO 2 nanomaterials . And it was suggested that the TiO 2 /Ti 3 C 2 exhibited more effective electron–hole separation than pure TiO 2 and Ti 3 C 2 under UV light irradiation.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 10
·2693-2699
·
IF 2.234
Cui Jingjie,Chen Shaowei,Liu Hong,Huang Zhen
6-Phosphate aminopurine ( 6 PA), a purine analog, is usually used in clinical anticancer treatment and biochemical research. Up to now, to the best of our knowledge, no literature about the electrochemical behaviors of 6 PA has been reported. In this study, nano-p–n junction heterostructures based on TiO 2 nanobelts were produced by the assembly of p-type semiconducting NiO nanoparticles onto the n-type surface-coarsened TiO 2 nanobelts. The electrochemical behaviors of 6 PA were investigated by different voltammetric techniques in a phosphate buffer solution of pH 7.4 using the heterostructures as the sensing electrode. Compared with single-phase TiO 2 nanobelt electrodes, the resulting chemically modified electrodes exhibited higher surface accumulation ability and enhanced electrocatalytic activities in the oxidation for 6 PA, with an irreversible oxidation peak at +0.91 V. It is proposed that the nano-p–n junction heterostructures played an important role in the enhancement of charge transport in the sensing electrodes. The results suggest that the nanoengineered TiO 2 nanobelts might be a promising candidate for biosensing applications of nucleic acid drugs that will be of significance to diagnostic medicine and molecular biology research.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Rong Li,Yuefa Jia,Naijing Bu,Jun Wu,Qiang Zhen
Using home-made Fe 2 O 3 /TiO 2 nanopowders as raw material, Fe 2 O 3 /TiO 2 composite ceramic was fabricated in order to use as photocatalysts in practical water purification treatment. The effects of sintering temperature on its phase variation, physical properties and photocatalytic properties were investigated. With sintering temperature increases, the anatase TiO 2 transforms into rutile phase, and reacts with hematite Fe 2 O 3 to form pseudobrookite Fe 2 TiO 5 . Above 800 °C, only Fe 2 TiO 5 and rutile TiO 2 were observed. Correspondingly, the porosity and the photocatalytic activity of Fe 2 O 3 /TiO 2 composite ceramic decreased, especially for samples sintered at 1000 °C, obvious decline in degradation efficiency was observed. The further investigation on photocatalytic degradation of methyl blue (MB) were carried out using ceramics sintered at 880 °C (TFC-880), which exhibited moderate physical and photocatalytical properties. The result showed that TFC-880 exhibited a high photodegradation capability for MB under either UV or visible light. Even in the third circle, it also showed a high degradation rate, meaning it has an extended application such as water treatment.
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