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Nano Research 2023年第7期16卷 10222-10233页

作者： Vadim I.Avilov Roman V.Tominov Zakhar E.Vakulov Lev G.Zhavoronkov Vladimir A.Smirnov Research Laboratory Neuroelectronics and Memristive Nanomaterials(NEUROMENA Lab) Southern Federal UniversityTaganrog 347922Russia Institute of Nanotechnologies Electronics and Electronic Equipment EngineeringSouthern Federal UniversityTaganrog 347922Russia

The paper shows the results of the mathematical model development and the numerical simulation of the oxygen vacancies,and the distribution of TiO,Ti_(2)O_(3),and TiO_(2)oxides in the titanium oxide nanostructure obtained by local anodic oxidation(anodization).The effect of the anodization voltage pulse duration and amplitude on the titanium oxide composition distribution and the conduction channel formation was shown.Synaptic device prototypes based on electrochemical titanium oxide are fabricated and investigated.It was shown that forming free resistive switching between the low resistances state(LRS)1.43±0.54 kΩand the high resistance state(HRS)28.75±9.75 kΩwere observed during 100,000 switching cycles and LRS 1.49±0.23 kΩwas maintained for 10,000 s.Multilevel resistive switching of the synaptic device prototype was investigated.It was shown that increasing Uset from 0.5 to 1.5 V leads to different LRS from 3.96±0.19 to 0.71±0.10 kΩ.The results obtained can be used in the development of technological foundations for the formation of high-performance multilevel artificial synapses for elements of neuroelectronics and hardware neural networks.

关键词： artificial intelligence neuromorphic systems memristive cross bar resistive switching scanning probe microscopy titanium oxide

Highly selective photocatalytic oxidation of methane to methyl hydroperoxide

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Nano Research 2024年第4期17卷 2473-2480页

作者： Chunling Bo Li Zhang Xiaolong Liu Huaiqiu Chang Yingxue Sun Xinyi Zhang Ting Tan Lingyu Piao National Center for Nanoscience and Technology Beijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Partial oxidation of methane into primary oxidation products with high value remains a challenge.In this work,photocatalytic oxidation of methane(CH_(4))with high methyl hydroperoxide(CH_(3)OOH)selectivity is achieved using pure titanium oxide(TiO_(2))without any cocatalyst at room temperature and atmospheric pressure.The CH_(3)OOH production rate can reach up to 2050±88μmol·g^(-1)·h^(-1) at pH≈7.0 with 100%selectivity in the liquid product.The stable reaction cycle can reach more than 30 times.This low-cost system achieves superior CH_(4) conversion activity and selectivity compared with similar work.The energy of hydrogen peroxide(H_(2)O_(2))to adsorbed hydroperoxyl radical(^(*)OOH)has a significantly lower reaction energy than conversion to adsorbed hydroxyl radical(*OH)on the(210)surface of the TiO_(2).The^(*)OOH preferentially combines with methyl radical(·CH_(3))to form the most energetically favorable CH_(3)OOH.The mild oxidative environment of this system prevents the reduction of CH_(3)OOH to CH_(3)OH or over-oxidation of CH_(4),which ensures the final CH_(3)OOH with high selectivity and stability.This work provided a low-cost but highly efficient method to achieve partial oxidation with superior selectivity,i.e.,to convert CH_(4) into high-value chemicals.

关键词： photocatalytic methane oxidation methyl hydroperoxide titanium oxide

Unsteady MHD Casson Nanofluid Flow Past an Exponentially Accelerated Vertical Plate:An Analytical Strategy

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 431-460页

作者： T.Aghalya R.Tamizharasi Department of Mathematics School of Advanced SciencesVellore Institute of TechnologyVelloreTamilnadu632014India

In this study,the characteristics of heat transfer on an unsteady magnetohydrodynamic(MHD)Casson nanofluid over an exponentially accelerated vertical porous plate with rotating effects were investigated.The flow was driven by the combined effects of the magnetic field,heat radiation,heat source/sink and chemical reaction.Copper oxide(CuO)and titanium oxide(TiO2)are acknowledged as nanoparticle materials.The nondimensional governing equations were subjected to the Laplace transformation technique to derive closed-form solutions.Graphical representations are provided to analyze how changes in physical parameters,such as the magnetic field,heat radiation,heat source/sink and chemical reaction,affect the velocity,temperature and concentration profiles.The computed values of skin friction,heat and mass transfer rates at the surface were tabulated for various sets of input parameters.It is perceived that there is a drop in temperature due to the rise in the heat source/sink and the Prandtl number.It should be noted that a boost in the thermal radiation parameter prompts an increase in temperature.An increase in the Prandtl number,heat source/sink parameter,time and a decrease in the thermal radiation parameter result in an increase in theNusselt number.The computed values of the skin friction,heat andmass transfer rates at the surface were tabulated for various values of the flow parameters.The present results were compared with those of previously published studies andwere found to be in excellent agreement.This research has practical applications in areas such as drug delivery,thermal medicine and cancer treatment.

关键词： Thermal radiation radiative flux nanofluid copper oxide titanium oxide accelerated plate

Pd-Ni nanoparticles supported on titanium oxide as effective catalysts for Suzuki-Miyaura coupling reactions

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 24-31,F0004页

作者： Dongxu Han Zhiguo Zhang Zongbi Bao Huabin Xing Qilong Ren Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

We have successfully prepared a series of Pd- Ni/TiO2 catalysts by a one-step impregnation-reduction method. Among these catalysts with different compositions of Ni and Pd, the one with the Ni：Pd ratio of 2.95 showed the best activity. Small monodispersed Pd-Ni bimetallic nanoparticles were loaded on the surface of titanium oxide nanopowder as confirmed with TEM and EDS mapping. The XPS analysis demonstrated that Pd exists as 31% Pd（II） species and 69% Pd（0） species and all nickel is Ni（II）. The prepared Pd-Ni/TiO2 exhibited enhanced catalytic activity compared to an equal amount of Pd/TiO2 for Suzuki-Miyaura reactions together with excellent applicability and reusability.

关键词： Pd-Ni bimetallic nanoparticles nanocatalysis Suzuki-Miyaura reaction titanium oxide

Comparative study of photocatalytic performance of titanium oxide spheres assembled by nanorods,nanoplates and nanosheets

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International Journal of Smart and Nano Materials 2012年第1期3卷 72-80页

作者： Meinan Liu Jin Chang Cheng Yan John Bella School of Engineering Systems Queensland University of Technology2 George StreetBrisbaneQueensland 4001Australia Chemistry Discipline Queensland University of Technology2 George StreetBrisbaneQueensland 4001Australia

TiO_(2) spheres assembled by nanorods,nanoplates and nanosheets were fabricated by facile hydrothermal/solvothermal methods.The three samples were thoroughly characterised by scanning electron microscopy,X-ray diffraction,the Brunauer-Emmett-Teller method and UV spectroscopy.The surface area of spheres assembled by nanosheets was 83.9 m^(2)g^(-1),which is larger than that obtained for nanorods(10.8 m2g-1)and nanoplates(6.31 m^(2)g^(-1)).Their photocatalytic performance was evaluated in terms of the decomposition rate of methyl orange in these three samples under UV irradiation.The best photoactivity was observed in the samples constructed from nanosheets.

关键词： titanium oxide hierarchical spheres photocatalyst

Selective Anti-Hepatoma Treated with titanium oxide Nanoparticles in vitro

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Journal of Wuhan University of Technology(Materials Science) 2003年第1期18卷 52-54页

作者：曹献英 WuhanUniversityofTechnology

Effects of titanium oxide (TiO 2) nanoparticles on Bel-7402 human hepatoma cells and L-02 human hepatocytes at different times were observed.Using cell culture,cell growth curves of Bel-7402 cells and L-02 cells treated with TiO 2 nanoparticles were examined by MTT assay,and the cellular ultrastructure was observed by an analytical transmission electron microscope (ATEM).It is found that OD value of Bel-7402 cell treated with TiO 2 nanoparticles for 48-144h is obviously lower than that of control group (p<0.01).However the growth curve of L-02 cells is almost not affected by TiO 2 nanoparticles.ATEM and energy dispersive X ray (EDX) analyses show that there are obvious vacuoles increased heterolysosome,and particles with high electron density which are confirmed to be TiO 2 nanoparticles in Bel-7402 cytoplasm.More interestingly,it is alse found that TiO 2 nanoparticle obviously inhibits the proliferation of hepatoma cells by altering lysosome activity and destroying cytoplasm structure.The inhibition on proliferation of hepatocytes by TiO 2 nanoparticles is much slighter.The results demonstrate that TiO 2 nanoparticle has different killing effects on cancer cell and normal cell.

关键词： titanium oxide nanoparticle hepatoma cells

Study the Characteristics of titanium oxide Hydrogen Ion Sensor Using XRD and AES

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稀有金属材料与工程 2006年第A3期35卷 250-251页

作者： Jung-Chuan Chou Hung-Hsi Yang Graduate School of Electronic Engineering National Yunlin University of Science and TechnologyDouliouTaiwan 640China

We study the extended gate ion sensitive structure,and deposit the titanium oxide (TiO_2) thin film on p-type (100) silicon substrate.The device of the hydrogen ion sensing structure is TiO_2/Si-substrate,and a commercial device of the metal oxide semiconductor field effect transistor (MOSFET) is connected to the separative sensing device.The sensitivity and linearity are measured under different work pressures.When the mixed ratio of Ar/O_2 is 80 ml·min^(-1)/20 ml·min^(-1),the work pressure is 4 Pa,the sputtering power is 150 W,and the sputtering time is two hours,the better sensing properties of the sensitivity and linearity are 36.49 mV/pH and 0.99654,respectively.However,some instruments are analyzed the surface of TiO_2 membrane,such as X-ray diffraction (XRD) and Auger Electron Spectrometer (AES).The characteristics of TiO_2 thin film can be demonstrated.

关键词： titanium oxide separative sensing device sensitivity linearity X-ray diffraction auger electron spectrometer

Preparation and the blood compatibility of titanium oxide nanorod arrays

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Preparation and the blood compatibility of titanium oxide na...

Fabrication of highly luminescent TiO_(2):Eu^(3+) thin film with low annealing temperature requirement by co-doping with Sn^(4+) ions

The 1st International Congress on Advanced Materials 2011

作者： Ping Luo Zhanyun Huang Dihu Chen State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University

In this work,titanium oxide nanorod arrays were fabricated by using thehydrothermal method on fluorine-doped tin oxide(FTO)coated glass.The diameterof the nanorods could be controlled from 150 nm to 30 nm by changing the growthparameters.The surface morphology and the structure of the samples were characterized by SEM and XRD.The wetting properties were identified by contactangle measurement.Platelet attachment was investigated to evaluate the bloodcompatibility of the samples designed with the different nanoscale topographies.Results show that the nanotopographical surfaces perform outstanding bloodcompatibility,and the adhering platelet decreased with the increasing diameter of thenanorods.

关键词： titanium oxide nanowire arrays Hydrothermal method Hemcompatibility.

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Journal of Rare Earths 2023年第10期41卷 1494-1502,I0001页

作者： Lu Zhang Bolin Zheng Junyi Zhai Tao Lin Laboratory of Optoelectronic Materials and Detection Technology Guangxi Key Laboratory for Relativistic AstrophysicsSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning530004China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083China

Rare earth(RE)-doped TiO_(2)thin films possess important applications in modern optoelectronic devices.However,the high annealing temperature requirement remains a critical restriction in device fabrications.In this work,TiO_(2)thin films doped with trivalent europium(Eu^(3+))ions were fabricated by a convenient sol-gel approach and subsequent annealing treatment.Interestingly,it is found that the optimal post-annealing temperature of TiO_(2):Eu^(3+)thin film is dramatically reduced from 800 to 300℃by incorporating 10 at%Sn^(4+)into the sol precursor.The Sn-incorporated film annealed at 300℃shows a 4-fold enhancement in photoluminescence(PL)intensity related to Eu^(3+)ions to the optimized Sn-free film.Systematic analysis reveals that this enhancement is attributed to Sn element promoting the crystallization of both anatase TiO_(2)and rutile SnO_(2)clusters at 300℃,which provides sufficient SnO_(2)/TiO_(2)crystal boundary facilitating Eu^(3+)to occupy and sensitized by SnO_(2)crystals.These results provide valuable insights into fabricating highly luminescent RE-doped TiO_(2)thin films with low annealing temperature requirement,which is essential for designing optoelectronic devices based on RE materials more freely in the future.

关键词： Rare earths titanium oxide Photoluminescence Sol-gel Post-annealing

Efficient aerobic oxidative desulfurization via three-dimensional ordered macroporous tungsten-titanium oxides

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Petroleum Science 2022年第1期19卷 345-353页

作者： Ming Zhang Yu-Jie Fu Chao Wang Yan-Chen Wei Yong-Kang Gao Wen-Shu Yang Lei Fan Wen-Shuai Zhu Hua-Ming Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013PR China Institute of Environmental Health and Ecological Security School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang212013PR China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225002PR China

A series of three-dimensional ordered macroporous(3 DOM)W-TiO_(2)catalysts have been prepared through a facile colloidal crystal template method.The prepared materials characterized in detail exhibited enhanced catalytic activity in aerobic oxidative desulfurization process.The experimental results indicated that the as-prepared materials possessed excellent 3 DOM structure,which is beneficial for the catalytic activity.The sample 3 DOM W-TiO_(2)-20 exhibited the highest activity in ODS process,and the sulfur removal can reach 98%in 6 h.Furthermore,the oxidative product was also analyzed in the reaction process.

关键词： Tungsten doped Three-dimensional ordered microporous material titanium oxide Aerobic oxidative desulfurization Sulfur compounds