CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yuhui Wan,Jiachen Song,Fuxue Yan,Xu Lu,Shu Yang,Yonggui Shi,Pengrong Ren
Zn and Ta co-doped TiO 2 ceramics with the nominal composition (Zn 1/3 Ta 2/3 ) x Ti 1-x O 2 ) were prepared using a conventional solid-state reaction method. Phase analysis revealed that all samples consisted of a single rutile-type TiO 2 phase, exhibiting a dense microstructure and uniform grain size. At a doping level of x = 0.005, the material exhibited excellent dielectric properties. Specifically, at room temperature and 1 kHz, its dielectric permittivity reached 3.93 × 10 4 , with a dielectric loss of 0.031. Over the temperature range from −60 °C to 200 °C, the variation in the dielectric permittivity was less than 15%, while the dielectric loss remained below 0.02 between −60 °C and 112 °C. X-ray photoelectron spectroscopy (XPS) was employed to analyze the valence states of the constituent elements. Impedance spectroscopy and bias-voltage measurement, together with the XPS analysis, revealed the coexistence of multiple mechanisms in Zn and Ta co-doped TiO 2 ceramics Electron-pinned defect-dipole (EPDD) polarization was identified as the primary origin of the colossal dielectric behavior, while Maxwell-Wagner polarization also contributed to the dielectric response.
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高影响因子
International Journal of Nanomedicine
·
2025
·
IF 6.5
Lei Huang,Lineng Wei,Dan Li,Weiqing Zhang,Lidong Liu
Purpose This study aimed to enhance the efficacy of sonodynamic therapy (SDT) for breast cancer by engineering TiO2 nanosheets modified with Au nanoclusters (TiO2-Au), thereby improving reactive oxygen species (ROS) generation under ultrasound (US) irradiation.Methods TiO2-Au sonosensitizers were synthesized via a deposition–precipitation with urea (DPU) method and characterized by TEM, XRD, and XPS. ROS generation efficiency was quantified using DPBF, TMB, and NBT probes, along with electron spin resonance (ESR). In vitro therapeutic performance was assessed in 4T1 breast cancer cells via flow cytometry, Calcein-AM/PI staining, and cell counting kit-8 (CCK-8) assay. In vivo efficacy and biosafety were validated in 4T1 tumor-bearing BALB/c mice through tumor growth monitoring, histological analysis, blood biochemistry, and hemolysis assays.Results TiO2-Au10.5 exhibited enhanced electron–hole separation, reduced bandgap (from 3.2 to 2.8 eV), and significantly boosted ROS generation under US irradiation. In vitro, TiO2-Au10.5 combined with US induced a 4.25-fold increase in intracellular ROS and a 4.7-fold higher apoptosis rate compared to TiO2 + US. In vivo, TiO2-Au10.5 + US achieved a tumor growth inhibition index of 76.9% without significant toxicity, as evidenced by normal blood markers, no hemolysis, and no damage to major organs.Conclusion Au nanocluster modification effectively tunes the sonodynamic performance of TiO2 nanosheets by modulating electron–hole separation and ROS production. Notably, varying the Au content enabled precise regulation of SDT efficacy, with TiO2-Au10.5 achieving optimal therapeutic outcomes. These findings highlight TiO2-Au as a safe, potent, and composition-tunable sonosensitizer platform for precise and effective cancer therapy.
研究领域:
肿瘤学
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纳米医学
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生物材料
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Haodong Zhang,Min Chen,Weiming Qian,Jianghao Zhang,Xueyan Chen,Jinhou Fang,Chi Wang,Changbin Zhang
Photothermal catalysis is a promising technology to convert CO 2 into high value-added products. Here, we show that loading Ru NPs on TiO 2 achieved a remarkable photothermal synergistic effect and the Ru-TiO 2 demonstrated a high efficiency for the photothermal conversion of low CO 2 concentration to CH 4 at the gas-solid interface. The photothermal activity of the Ru-TiO 2 (217.9 µmol/(g·h)) was nearly 6 times higher than pure thermal activity (38.08 µmol/(g·h)), and nearly 20 times than the photocatalytic activity (10.9 µmol/(g·h)). We revealed that the light excitation could drive the generated electrons from TiO 2 to Ru particles, beneficial to CO 2 reduction, while external heating showed no influence on the charge separation of the Ru-TiO 2 . Hence, the photothermal synergy is not a heat-assisted photocatalytic process, but a photo-assisted thermal catalytic process. We finally demonstrated that the CO 2 was firstly converted to CO, and the CO was further hydrogenated to CH 4 . The introduction of light could promote the activation of intermediate CO species at the Ru-Ti interface sites, thus greatly accelerating CO hydrogenation to CH 4 . This work contributes to further understanding of the mechanism of photothermal catalytic CO 2 reduction.
研究领域:
催化化学
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环境科学
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材料科学
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 4
·904
·
IF 3.1
Jianwei Zhang,Baoyu Huang,Xinlei Li,Chao Yang,Wenzhuo Zhao,Xiuhua Xie,Nan Wang,Xiaogan Li
The fluorinated titanium dioxide (F-TiO2) hollow spheres with varying F to Ti molar ratios were prepared by a simple one-step hydrothermal method followed by thermal processing. The diameter of the F-TiO2-0.3 hollow spheres with a nominal ratio of F:Ti = 0.3:1 was about 200–400 nm. Compared with the sensor based on pristine TiO2sensing materials, the F-TiO2-0.3 sensor displayed an enhanced sensing performance toward gaseous formaldehyde (HCHO) vapor at room temperature under ultraviolet (UV) light irradiation. The F-TiO2-0.3 sensor demonstrated an approximately 18-fold enhanced response (1.56) compared to the pristine TiO2sensor (0.085). The response and recovery times of the F-TiO2-0.3 sensor to 10 ppm HCHO were about 56 s and 64 s, respectively, and a limit-of-detection value of 0.5 ppm HCHO was estimated. The F-TiO2-0.3 sensor also demonstrated good repeatability and selectivity to HCHO gas under UV light irradiation. The outstanding HCHO gas-sensing properties of the F-TiO2-0.3 sensor were related to the following factors: the excitation effect caused by the UV light facilitated surface chemical reactions with analyte gas species; the hollow sphere structure provided sufficient active sites; and the surface fluoride (≡Ti−F) created additional chemisorption sites on the surface of the TiO2material.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
VACUUM
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2025
·
IF 3.9
Xiaoying Yu,Gala Sa,Aiju Xu
The coal chemical industry produces significant wastewater containing refractory organic pollutants, with quinoline being a particularly persistent contaminant in secondary biochemical effluents. To overcome the limitations of standard TiO 2 photocatalysts—specifically, their restricted light absorption range and rapid charge recombination—this work created Gd-doped TiO 2 (Gd-TiO 2 ) catalysts using a hydrothermal approach. Comprehensive characterization showed that the optimal 1.5 % Gd-TiO 2 presents three primary advantages: (1) a 55 % increase in specific surface area (174 m 2 g −1 ), (2) enhanced visible-light absorption through bandgap reduction (3.06 eV), and (3) improved charge separation. These modifications enabled the 1.5 % Gd-TiO 2 catalyst to achieve 84 % quinoline degradation within 3 h (mineralization rate: 53.2 %), maintaining 80.3 % efficiency after four cycles, demonstrating exceptional stability. Mechanistic studies revealed a hydroxyl radical-dominated degradation pathway involving sequential benzene-ring opening and pyridine-ring cleavage. This study presents a high-efficiency photocatalyst for industrial wastewater remediation and provides essential insights into rare-earth-modified TiO 2 systems.
研究领域:
环境科学
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材料科学
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光催化
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化学工程
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水污染治理
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
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2025
·
IF 5.1
He Liu,Gaozhao Chen,Xiong Shen,Wentao Hao,Qiuyun Ouyang
To solve the toxicity and stability issues of traditional lead halide perovskites, Cs2AgBiBr6@TiO2 nanocomposites were synthesized via a thermal injection method. Cs2AgBiBr6 quantum dots (QDs) and Cs2AgBiBr6@TiO2 nanocomposites were dispersed in methyl methacrylate (MMA) to prepare (Cs2AgBiBr6)6/PMMA and (Cs2AgBiBr6@TiO2)6/PMMA organic glasses (OGs). The nonlinear absorption (NLA) properties of the materials were investigated using the open-aperture Z-scan technique, revealing that after compositing with TiO2, the reverse saturable absorption (RSA) coefficient of the (Cs2AgBiBr6@TiO2)6/PMMA OG increased from 194 cm GW−1 to 294 cm GW−1 at an energy of 10 µJ. This is attributed to the incorporation of TiO2, which facilitates interfacial charge separation and accelerates electron transfer, thereby significantly enhancing the RSA of Cs2AgBiBr6@TiO2. Under identical testing conditions, the optical limiting thresholds of the (Cs2AgBiBr6)6/PMMA and the (Cs2AgBiBr6@TiO2)6/PMMA OGs were measured to be 5.33 J cm−2 and 3.87 J cm−2, respectively. Compared to the (Cs2AgBiBr6)6/PMMA OG, the (Cs2AgBiBr6@TiO2)6/PMMA OG demonstrates superior optical limiting performance. Electrochemical impedance spectroscopy (EIS) measurements demonstrated that Cs2AgBiBr6@TiO2 exhibits lower impedance (Rct) and favorable photocurrent response (0.61 µA cm−2), confirming its efficient charge separation/transport capability, which further promotes the RSA effect of Cs2AgBiBr6@TiO2. These results indicate that Cs2AgBiBr6@TiO2 holds promising potential for applications in optical limiting devices.
研究领域:
材料科学
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光子学
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纳米技术
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电化学
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光学材料
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产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
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2025
·
IF 3.2
Jiaojiao Xu,Qiuxuan Ren,Yuqi Liu,Yan Yang,Gai Zhang
The development of stable and efficient photocatalysts for the oxidative degradation of dibenzothiophene(DBT) in fuels remains a major challenge. Herein, a novel spherical binuclear metallophthalocyanine containing methoxy substituents Mn 2 Pc 2 (EP) 4 was self-assembled on TiO 2 via planar conjugated-ligand π-interaction to prepare Mn 2 Pc 2 (EP) 4 /TiO 2 photocatalysts using a facilely “in suit” hydrothermal method. The red-shifted in the UV absorption bands of the Mn 2 Pc 2 (EP) 4 /TiO 2 composites indicated a strong π-interaction between the composite materials. The Mn 2 Pc 2 (EP) 4 /TiO 2 catalysts exhibited high stability and oxidative desulfurization performance towards DBT in a model oil containing n-octane. The catalytic efficiency of the Mn 2 Pc 2 (EP) 4 /TiO 2 composite (98.85 %) was approximately 2.2 times higher than that of TiO 2 (44.97 %). The results verified that Mn 2 Pc 2 (EP) 4 improved the visible-light photocatalytic activity and enhanced the oxidative desulfurization activity of TiO 2. The photocatalytic efficiency of the Mn 2 Pc 2 (EP) 4 /TiO 2 catalyst remained at 92 % for DBT after 5 reaction cycles. Thus, the samples exhibited excellent recoverability and stability compared to that of TiO 2 . Mechanistic studies revealed that the ⁎ O 2 -[Mn 2 Pc 2 (EP) 4 ] + /TiO 2 (e − ) species, which were the main active intermediate via the π-interaction self-assembling of Mn 2 Pc 2 (EP) 4 , effectively improved the photocatalytic oxidation degradation of DBT. This study demonstrates the potential of Mn 2 Pc 2 (EP) 4 /TiO 2 catalysts for developing environmentally friendly and efficient visible-light-driven desulfurization technology.
研究领域:
材料化学
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环境催化
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能源化学
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纳米材料
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光催化
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2026
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IF 8.3
Xizhe Lu,Fang Cheng,Gangqiang Wu,Zhendong Yao,Yongfu Cui,Chao Li
MgH 2 is a hydrogen storage material with high hydrogen absorption/release temperatures and poor kinetics. Although a large number of catalysts capable of optimizing the performance of MgH 2 have been developed in recent years, there are relatively few studies focus on its size effect. In this work, TiO 2 particles with the similar morphology but different sizes were synthesized. It shows that reducing particle size within a certain range (from 1.3 μm to 60 nm) can dramatically enhance the catalytic effect of TiO 2 on MgH 2 . However, when the catalyst size reduces from 60 to 25 nm, due to the severe agglomeration of nanoparticles, there is a little improvement in the dehydrogenation temperature, but an obvious improvement in dynamics. It can be seen in solid-state catalytic systems, merely considering particle size while ignoring the problem of agglomeration and dispersion form of the catalyst in the matrix cannot achieve the best catalytic effect.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 126
·期 2
·697-705
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IF 1.289
Tursun Abdiryim,Aminam Ubul,Ruxangul Jamal,Yuchuan Tian,Tunsagul Awut,Ismayil Nurulla
Polyaniline/nano-TiO 2 composites with the content of nano-TiO 2 varying from 6.2 wt % to 24.1 wt % were prepared by using solid-state synthesis method at room temperature. The structure and morphology of the composites were characterized by the Fourier transform infrared (FTIR) spectra, ultraviolet-visible (UV–vis) absorption spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical performances of the composites were investigated by galvanostatic charge–discharge measurement, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results from FTIR and UV–vis spectra showed that the composites displayed higher oxidation and doping degree than pure PANI. The XRD and morphological studies revealed that the inclusion of nano-TiO 2 particles hampered the crystallization of PANI chains in composites, and the composites exhibited mixed particles from free PANI particles and the nano-TiO 2 entrapped PANI particles. The galvanostatic charge–discharge measurements indicated that the PANI/nano-TiO 2 composites had higher specific capacitances than PANI. The composite with 6.2 wt % TiO 2 had the highest specific capacitance among the composites. The further electrochemical tests on the composite electrode with 6.2 wt % TiO 2 showed that the composite displayed an ideal capacitive behavior and good rate ability. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·Vol. 40
·期 5
·631-637
·
IF 4.914
Zhenmin Xu,Ru Zheng,Yao Chen,Jian Zhu,Zhenfeng Bian
Ordered mesoporous Fe/TiO 2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO 2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO 2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity . The ordered pore structure of the TiO 2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO 2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO 2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants .
研究领域:
材料科学
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环境化学
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催化化学
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纳米科技
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光化学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Hongjing Wu,Shaohua Qu,Kejun Lin,Yuchang Qing,Liuding Wang,Yuancheng Fan,Quanhong Fu,Fuli Zhang
It has been rarely reported that the microwave absorption materials can exhibit excellent low-frequency EM wave absorbing properties. In this paper, we synthesized steady short carbon fibers (SCFs)@TiO 2 composites by using simple one-pot hydrothermal process. The conductive short carbon fibers could be separated by TiO 2 nanoparticles from each other and reduced the conductivity of composite materials as a whole, meeting the requirements of impedance matching . With the introduction of SCFs content, SCFs@TiO 2 composites showed improved tan δ E values at low frequencies, implying the enhanced microwave attenuation ability at low and medium frequency. We unexpectedly found that the SCFs@TiO 2 composites exhibited very strong absorbing peaks ( i.e. , −46.3 dB) at low frequencies with relatively thin matching thickness. Interestingly, when the thickness of the SCFs@TiO 2 composite was only 1.0 mm, the absorbing bandwidth with a RL value less than −10 dB was over 14.3–16.7 GHz ( i.e. , absorbing frequency bandwidth is 2.4 GHz).
研究领域:
材料科学
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电磁功能材料
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纳米复合材料
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微波吸收材料
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DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Jingzhong Zhao,Lei Zhang,Weiqiang Xing,Kathy Lu
B/N codoping is an effective way to narrow the band gap of TiO2 to enhance the photocatalytic activity. However, the traditional doping method using ammonia as N source is still unsatisfactory because of its safety risks and high cost. In this work, a benign and cost-effective method has been developed to prepare the B/N codoped TiO2. First, we use TiB2 as the raw material to prepare B-doped TiO2 via a hydrothermal method followed by heat treatment. Then the B/N codoped TiO2 can be simply produced by annealing the mixture of the as-prepared B-doped TiO2 and urea. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that the samples present anatase structure and spherical morphology. X-ray photoelectron spectroscopy (XPS) analysis indicates that B and N atoms exist not only on the surface but also in the bulk. Moreover, the content of N atoms decreases with the depth in the sample while Ti3+ content gradually increases with the depth. The UV–vis absorption spectrum shows an extension of light absorption into the full visible region. More importantly, the B/N codoped TiO2 exhibits promoted photocatalytic activity under both UV and visible light than the B-doped TiO2.
研究领域:
材料科学
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光催化
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纳米材料
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无机化学
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DOI
高影响因子
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