Article
Engineering, Environmental
Zhendong Yu, Suhang Xun, Meizan Jing, Haofeng Chen, Weiyu Song, Yanhong Chao, Mohammad Rahmani, Yuxiao Ding, Mingqing Hua, Jian Liu, Wenshuai Zhu
Summary: A 3D assembly TiO2 nanoflower catalyst with controllable oxygen vacancies was developed for oxidative desulfurization (ODS) in diesel oil. The increased oxygen vacancies and Ti3+ promote the chemical adsorption and reduce the energy barriers, leading to the generation of hydroxyl radicals and superoxide radicals. The experiment showed a 100% ODS rate in only 30 minutes under optimal conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Chunxu Wu, Jiaqi Zhang, Bin Fang, Yongqian Cui, Zipeng Xing, Zhenzi Li, Wei Zhou
Summary: The self-floating biomass charcoal supported flower-like plasmon Ag/C, N co-doped defective TiO2 photocatalyst shows excellent visible-light-driven photocatalytic performance, with a photocatalytic degradation ratio of 2,4-dichlorophenol and hydrogen evolution significantly higher than pristine TiO2, attributed to the synergistic effect of the surface plasmon resonance effect of Ag nanoparticles, efficient C, N co-doping, and formation of oxygen vacancy defects. The long-term stability of this novel self-floating photocatalyst indicates its potential practical applications.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Yong Jieh Lee, Lutfi Kurnianditia Putri, Boon-Junn Ng, Lling-Lling Tan, Ta Yeong Wu, Siang-Piao Chai
Summary: The proliferation of marine petroleum exploitation has caused oil spills in the aquatic ecosystem. Photocatalysis using blue TiO2 with oxygen vacancies can efficiently degrade diesel oil and improve degradation performance compared to pristine TiO2.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Wei Zhao, Kai Zhang, Licheng Wu, Qian Wang, Danhong Shang, Qin Zhong
Summary: This study evaluates the effect of self-doping Ti3+ into catalysts on the activity of the catalysts. Various characterization methods such as XRD, XPS, and EPR confirm the presence of Ti3+ and oxygen vacancy, which significantly affect the performance of the catalysts. The results indicate potential for improving low-temperature SCR performance through strategic design of Ti3+ self-doped catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Zhenzi Li, Shijie Wang, Jiaxing Wu, Wei Zhou
Summary: TiO2 nanomaterial photocatalysts have received extensive research interest for energy and environmental applications. The main challenges are the large bandgap and charge-carrier recombination. Recent reports suggest that engineering the defects of TiO2 can enhance photoresponse and promote charge separation efficiency. This review summarizes the synthesis strategies for defective TiO2, especially black TiO2 nanomaterials, and discusses their applications, defect types, characteristics, and photocatalytic mechanism in detail.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Chemistry, Physical
Fan Yang, Wangxian Luo, Jing Wang, Lan Xiang
Summary: This study investigated the effect of Mg2+ doping concentration on the phase transition of TiO2 and proposed the defect structures of Mg2+ doped TiO2. Over 96% conversion of anatase to rutile was achieved with 1.48% Mg doping at 875 degrees C for 1 h. Two defect structures, interstitial Mg2+ (Mgint) and substitute Mg2+ (Mgsub), were quantified using the Rietveld method, and a correlation between the defect structures and the effect on phase transition was established. These results provide insights into TiO2 pigment production and modulation of TiO2 defects for phase transition control and other applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Environmental
Huanjing Liang, Mingchuan Yu, Yu Sun, Jianjiang Lu, Junfeng Niu
Summary: Blue defective TiO2, with high electron conductivity and oxygen vacancies, is highly attractive. By utilizing PH3 to synchronize the reaction, a unique P3+-O-v-Ti3+ configuration is designed, leading to a more stable form of Ti3+ and remarkable photoelectrocatalytic performance and stability.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Zhihui Hu, Huanmin Liu, Ningxin Kang, Kangle Lv, Qin Li
Summary: Using solvothermal methods, two-dimensional titanium carbide (Ti3C2TX) MXene was oxidized in situ into TiO2 nanocrystals, providing an effective strategy for constructing highly efficient TiO2/Ti3C2TX heterojunctions for photocatalytic applications. The choice of solvent during the process was found to have a significant impact on the oxidation and performance of Ti3C2TX. This work highlights the importance of the oxidation environment for Ti3C2TX and brings about new considerations for the processing techniques of MXene families for practical applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Xiangyan Chen, Xin Peng, Longbo Jiang, Xingzhong Yuan, Jia Fei, Wei Zhang
Summary: In this study, a carbon-coated Ti3+- and Ov-doped A/R-TiO2 photocatalyst was successfully developed for the removal of antibiotics with high efficiency. The analysis on the effect of water matrix on the removal of TC indicated that the prepared materials exhibited good stability and repeatability in degrading antibiotics.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
Hanjun Zou, Yajie Feng, Jiangping Ma, Di Wu, Yang Wang, Chaogang Ban, Youyu Duan, Guoyu Wang, Li-Yong Gan, Xiaoyuan Zhou
Summary: This study investigates the relationship between defect and strain in oxygen vacancy-engineered photocatalysts, using TiO2 as an example. The results show that high oxygen vacancy concentration and slight strain lead to the optimal photocatalytic H-2 yield.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Mohua Li, Shijie You, Xiaoguang Duan, Yanbiao Liu
Summary: Defect engineering is an effective method to understand the relationship between structure and catalytic activities of transition metal oxides. In this study, a novel strategy was developed to control the oxygen vacancy levels and modify the surface chemistry of a catalytic membrane. The increased number of Lewis acid sites in the membrane resulted in enhanced catalytic activities.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Materials Science, Ceramics
Vitaly Gurylev, Tsong Pyng Perng
Summary: Defects in zinc oxide (ZnO) play a crucial role in influencing its properties and applications, with potential for improved characteristics through the introduction of oxygen and zinc vacancies. Defective ZnO shows broad application potential in nanoscale devices, yet faces challenges and requires further research for in-depth exploration.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Engineering, Environmental
Jie Li, Dandan Cheng, Zhenglin Chen, Lixia Yang, Lingyi Zheng, Zhihui Wei, Tianzhu Ma, Jie Zhang, Yan Luo
Summary: By preparing oxygen vacancy/Ti3+ engineered TiO2 nanotube arrays through an electrochemical strategy at high potential, the TiO2 shows enhanced visible light absorption capabilities and catalytic activity, effectively degrading molecules like chloramphenicol with the final products posing no risk to the ecosystem.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Ceramics
Jiangtao Fan, Tiantian Yang, Yongfan Cao, Jiyan Liang
Summary: In this study, ceramics of (Tb0.5Ta0.5)(x)Ti1-xO2 with new defect clusters were fabricated, showing large dielectric constants, and one of the samples exhibited ultralow loss at room temperature and 1 kHz. The excellent dielectric properties were attributed to defective dipoles associated with oxygen vacancies, which limited the long-range hopping of electrons and caused the electron pinning effect. Grain boundary and electrode effects also contributed to the dielectric constant.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Tengxiang Zhang, Yaqing Zhang, Ping Ning, Huimin Wang, Yanping Ma, Siyuan Xu, Mo Liu, Qiulin Zhang, Futing Xia
Summary: Iron-tungsten composite oxide catalysts were prepared using a no-water grinding method followed by calcination at different temperatures. The study found that catalysts prepared at low temperatures showed the greatest catalytic activity, while high-temperature calcination led to decreased catalytic properties. Additionally, catalysts calcined at 500 degrees Celsius exhibited the best catalytic performance due to the coexistence of surface defects and specific species, resulting in over 90% NOx conversion in the 220-500 degrees Celsius range.
APPLIED SURFACE SCIENCE
(2021)
Article
Optics
R. B. Adamov, G. A. Melentev, I. V. Sedova, S. V. Sorokin, G. V. Klimko, I. S. Makhov, D. A. Firsov, V. A. Shalygin
Summary: This study investigates the THz luminescence in doped nanostructures with GaAs/AlGaAs quantum wells under interband optical pumping. The results show that the spatial separation of donors and acceptors can greatly enhance the integrated intensity of THz emission.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yanru Li, Lei Zhong, Sha Jiang, Yutong Wang, Binyao Huang, Guotao Xiang, Li Li, Yongjie Wang, Chuan Jing, Xianju Zhou
Summary: In this study, a ratiometric luminescent thermometry based on dual-emission centers was developed using co-doped CaNb2O6 phosphors with Bi3+ and Pr3+. The obtained samples exhibited good thermosensitive and thermochromic characteristics, with a maximum absolute sensitivity of 0.09 K-1 @ 528 K and a maximum relative sensitivity of 2.17 % K-1 @ 453 K.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yujing Gong, Yeqing Wang, Zhiyuan Wang, Yijian Sun, Yi Yu
Summary: Single crystals of Dy3+ single-doped and Dy3+/Tb3+ co-doped CaYAlO4 were grown and analyzed. The incorporation of Tb3+ resulted in increased absorption and emission cross sections. The fluorescence lifetimes and branching ratios of the yellow emission were affected by the presence of Tb3+. The deactivation effect of Tb3+ ions and energy transfer mechanism were also discussed.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Lu Chen, Zhuangzhuang Ma, Jian Chen, Wang Guo
Summary: This study focuses on enhancing the thermal robustness of phosphor converter materials by preparing composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO. The composite ceramics showed high density and thermal conductivity at the optimum temperature of 1400℃. Stable laser-driven white light was obtained under blue laser excitation.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Yuwei Wu, Chunhui Niu, Lei Wang, Mingqing Yang, Shiyu Zhang
Summary: Er3+-doped germanate-tellurite glasses were prepared and their structure, luminescent, and temperature-sensing properties were studied. The glass exhibited large values of O2 and O6 and its luminescence intensity varied with temperature.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Kensei Ichiba, Takumi Kato, Kenichi Watanabe, Yuma Takebuchi, Daisuke Nakauchi, Noriaki Kawaguchi, Takayuki Yanagida
Summary: In this study, Eu-doped YVO4 single crystals with different concentrations were fabricated to evaluate their photoluminescence and scintillation properties. The results showed that the samples doped with Eu exhibited emission peaks due to 4f-4f transitions in PL and scintillation spectra. Based on the pulse height spectra, the light yield of the Eu-doped samples increased with increasing Eu concentration, while the afterglow level decreased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Daiwen Xiao, Hei-Yui Kai, Anjun Huang, Menglin Song, Ka-Leung Wong, Peter A. Tanner
Summary: The emission spectra of Cs2NaEuCl6 nanoparticles synthesized by the hot injection method are explained. The dispersion of the nanoparticles in alkane solvents in the experiment allows the determination of the magnetic dipole radiative rate for the D-5(0) -F-7(1) channel in vacuum, which is in agreement with the calculated value.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Italia V. Barbosa, Geraldine Dantelle, Alain Ibanez, Lauro J. Q. Maia
Summary: The thermal response and luminescence properties of different oxide matrices were evaluated to design more accurate thermal probes. It was found that thermal probes emitting in BW-II provide better thermal sensing with higher signal-to-noise ratio. Additionally, doping Nd3+ in Y2O3 matrix maximizes luminescence intensity, making it a promising matrix for thermal sensing.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xin Li, Yu Zhang, Hongrui Ren, Lunlong Xie, Yinsheng Di, Mengqing Han, Zhaohui Bai, Quansheng Liu, Liangliang Zhang, Jiahua Zhang
Summary: This study successfully prepared phosphor samples based on Ca3-xLuxSc2-xMgxSi3O12:Ce3+ and investigated their luminescence properties. With the increase in Lu-Mg concentration, the peak of the sample redshifted, but the thermal stability gradually decreased. The LD devices made from CLSMS:Ce3+ fluorescent materials showed a decrease in cyan-green light and an increase in red light as the Lu-Mg concentration increased.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Tim Pier, Julia Hopster, Thomas Juestel
Summary: This study investigates and reports on several samples of cerium-activated gallium-based garnet phosphors. The optimal activator concentration was found to be 1 atom-%. The size of non-emitting lanthanide ions and the molar concentration of cerium strongly influenced the crystal field splitting, which in turn shaped the excitation and emission wavelengths.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Guijie Zhao, Wei Shi, Xin Xin, Fengcai Ma, Yongqing Li
Summary: This study reveals for the first time the proton transfer pathways and changes in the photophysical properties of P-TNS with three intramolecular hydrogen bonds. The reaction mechanism and driving force for the proton transfer process are explained through analysis of potential energy surface, frontier molecular orbitals, and hydrogen bond parameters, among others.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Li He, Jinshu Huang, Zhengce An, Haozhang Huang, Yu Zhao, Kexin Zhong, Bo Zhou
Summary: In this study, we designed a NaYF4:Yb3+/Tm3+@NaYF4 core-shell nanostructure to achieve thermochromic upconversion and high thermal sensitivity. We found that the blue upconversion emission of Tm3+ decreased while the deep-red emission increased with elevating temperature. The sample also showed a gradual emission color change from blue to purplish-red, and the optimal relative sensitivity reached 2.79% K-1.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Rupesh A. Talewar
Summary: A series of Li2TiO3 phosphors doped with Mn4+ and codoped with Mn4+ and Er3+ were synthesized, which demonstrated the ability of Mn4+ ions to absorb UV-Vis photons and subsequently transfer energy to Er3+ ions, resulting in the emission of near-infrared light. These materials have the potential to enhance the absorption efficiency of Er3+-based luminescent materials.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
Xingyuan Ma, Jianfeng Li
Summary: Carbon quantum dots (CQDs) with tunable photoluminescence properties have been synthesized using suitable carbon and dopant sources in an aqueous system. The synthesized CQDs exhibited blue, green, yellow, and red emissions, and solid-state luminescence was achieved through the preparation of solid-state fluorescent films and phosphors. This study provides important technical support for the future development of CQDs synthesis.
JOURNAL OF LUMINESCENCE
(2024)
Article
Optics
De Bin Fu, Yang Bing Xu, Yu Teng Zhang, Shan Ting Liu, Xiao Fei Yang, Sheng Hua Liu
Summary: A pair of new chiral molecules, (S)-4 and (R)-4, have been designed and synthesized by introducing valine-containing groups at symmetrical positions on the periphery of an indolo[3,2-b]carbazole unit. These molecules exhibit aggregation-induced circular dichroism (AICD) properties in DMF/water mixtures, and in a mixture with 99% water fraction, they show strong, mirror-image, blue circularly polarized luminescence (CPL) signals.
JOURNAL OF LUMINESCENCE
(2024)