Advanced Science
·
2025
·
IF 14.1
Chaomin Duan,Meng Wang,Yan Zhang,Zhihua Lian,Wenpo Shan
Ammonia (NH 3 ) emissions adversely affect both the environment and human health. The selective catalytic oxidation of NH 3 (NH 3 -SCO) holds great promise for NH 3 abatement; however, there remains a lack of cost-effective NH 3 -SCO catalysts with high activity and N 2 selectivity for practical applications. This study reports on a strategy for constructing an outstanding NH 3 oxidation catalyst via the in situ doping of Cu into CeO 2 nanorods. The designed CeCuO x nanorod catalyst shows remarkable activity, N 2 selectivity, and stability for NH 3 oxidation, achieving complete conversion below 250 °C, with ≈80% N 2 selectivity. The results of various characterization tests and density functional theory (DFT) calculations show that the addition of Cu induces the formation of abundant Cu + -O v -Ce 3+ active sites on the CeO 2 , which are beneficial for the adsorption and activation of reactants. Additionally, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms that the addition of Cu switches the primary intermediate species of NH 3 oxidation from bidentate nitrate species to monodentate nitrate species, which accelerates the rate-determining step of NH 3 -to-N 2 oxidation. Therefore, doping Cu into CeO 2 greatly improves its NH 3 oxidation activity and N 2 selectivity. This study provides valuable insights into the construction of highly active sites for NH 3 oxidation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTIK
·
2022
·
IF 2.84
Zhiyuan Cheng,Tong Liu,Hao Lin,Tian Shi,Zhiqi Ye,Shenghong Yang,Yueli Zhang
Eu 3+ was ideal red emitter due to its efficient red emitting transitions 5 D 0 → 7 F j and Ce 3+ was most common sensitizer due to its strong parity-allowed absorption bands . However, direct sensitization of Ce 3+ on Eu 3+ (SCE) in hexagonal NaYF 4 was very weak and unpractical. In this work, rate equations were introduced to elaborate the details of energy transfer (ET) among Ce 3+ , Gd 3+ and Eu 3+ in NaYF 4 , and how the SCE was much enhanced. The pure hexagonal phase of all samples were guaranteed by powder XRD patterns and SEM images, despite the morphology was influenced by rare earth components. While increasing Eu 3+ concentration over 0.03, SCE was drastically dimished; on the contrary, it could be 60 folds enhanced by tri-doping Gd 3+ ions. The rate equations of sensitizers were established and solved by calculating the lifetimes. It was found out that, while increasing Gd 3+ concentration to 0.4, ET Ce→Gd could compete against ET Ce→Eu to capture 73.8% of energy absorped by Ce 3+ , which strongly favored SCE. The solution also revealed that SCE originated from ET chain Ce→Gd→Eu was much more efficient than direct SCE from ET Ce→Eu, which originated the significant enhancement.
研究领域:
材料科学
·
发光材料
·
稀土掺杂
·
光物理
·
纳米光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 6
·4242-4251
·
IF 3.5
Shuya Wang,Wenzhi Sun,Tingting Zhao,Chunqing Fu,Xiaoyan Fu,Hongwu Zhang
In this paper, X-ray-activated super long persistent ultraviolet A luminescence from Ca 3 (PO 4 ) 2 : Ce 3+ has been observed. The crystal structure analysis has shown that the as-prepared samples are pure β-Ca 3 (PO 4 ) 2 phases with rhombohedral structure and R 3 c space group. The photoluminescent spectra of the samples all consist of a broad band in 340–400 nm UVA1 region, which is assigned to the 5d 1 –4f 1 electronic transition of Ce 3+ ions. More important, under the 3 min X-ray irradiation, Ca 3 (PO 4 ) 2 : Ce 3+ show super long persistent luminescence in the UVA1 region, which can persist for more than 16 h. And its afterglow intensity after 16 h decay is still 4.10 times stronger of the back ground intensity. Furthermore, only 10 s X-ray irradiation can induce excellent long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ , which can persist for more than 5 h and afterglow emission intensity is about 3.03 times of the background intensity. The trap analysis has confirmed that the different X-ray irradiation time do not create new traps and there is the same trap with 0.75 eV trap depth existing even under the extremely low X-ray dose (10 s X-ray irradiation). Furthermore, under 10 s X-ray irradiation, the thermoluminescence (TL) intensity of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ still reaches 0.32 times of the initial TL intensity even after 120 min, which thus leads to the super long persistent luminescence. Thus, the large amounts of trapped electrons induced by the high energy X-ray irradiation are the principal cause for super long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : Ce 3+ .
研究领域:
材料科学
·
发光材料
·
光学物理
·
辐射探测
·
荧光粉研究
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Bing Chen,Xvsheng Qiao,Dengfeng Peng,Xianping Fan
In this study, hexagonal-phase NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were synthesized via a mild solvothermal method. By modifying the Eu3+ dopant concentration, the crystal phase, morphology, and luminescent properties were well controlled. A broad excitation band centered at around 260 nm corresponding to the 2F5/2 → 4f-5d transition of Ce3+ was detected in the hosts containing Gd3+ ions by monitoring the Eu3+ emissions, indicating that an efficient Ce3+ → Eu3+ energy transfer occurred via the Gd3+ sublattice. Luminescence decay behaviors of the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were studied, and the energy transfer mechanism was discussed. An obvious rising edge on the luminescence decay curve of Eu3+ ions in the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods was observed. The rising time is proposed to describe the energy migration time from Ce3+ to Eu3+ via the Gd3+ sublattice.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 37
·13160-13166
·
IF 4.174
Yali Yu,Qingqing Zhang,Heng Gao,Chenxiao Yan,Xiong Zheng,Tong Yang,Xiaoshun Zhou,Yong Shao
G-quadruplex DNAs (G4s) have been reported to exhibit the DNAzyme activities by binding with some metal complexes and functional organic ligands. However, there is a challenge to develop metalloenzyme-mimic G4-based innate DNAzymes using the complexed metal ions directly serving as the active centers. This will diversify DNAzymes for developing novel devices since G4 structures are more polymorphic than the other DNA foldings. In this work, we found that the lanthanide trivalent cerium ion of Ce3+ can bind to the human telomere G4 (htG4) according to a 1 : 2 binding mode favorable for creating metalloenzymes-mimic G4 DNAzymes. This Ce3+-G4 entity exhibits a peroxidase activity towards the oxidation of the substrate of 3,3,5,5-tetramethylbenzidine (TMB) by hydrogen peroxide. The 5′ G4 tetrads with the orderly arranged carbonyl oxygen atoms are believed to be the coordination sites for Ce3+ and favor the conversion between Ce3+ and Ce4+. Our work provides an alternative feasibility in developing the G4-based innate DNAzymes for variant applications.
研究领域:
生物化学
·
分子生物学
·
催化
·
核酸化学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jinjian Wei,Mengxin Liu,Xinan Shi,Daocheng Pan
NaYF4:Ce3+,Tb3+ down-conversion nanoparticles with a photoluminescence quantum yield (PLQY) of 54.8% are synthesized by using a ligand-assisted coprecipitation method in this study. The reaction is completed within 1 min at room temperature, and short-chain hexanoic acid and hexylamine serve as the binary ligands, which enable us to synthesize highly luminescent NaYF4:Ce3+,Tb3+ nanoparticles at room temperature. X-ray diffraction (XRD) and transmission electron microscopy (TEM) are used to characterize the as-prepared nanocrystals. The results reveal that the NaYF4:Ce3+,Tb3+ nanocrystals exhibit excellent dispersion and have a particle size of 2.7 nm. Our NaYF4:Ce3+,Tb3+ nanocrystals possess the advantages of room-temperature preparation, high PLQY, and ultrasmall particle size. These results reveal that the NaYF4:Ce3+,Tb3+ nanocrystals might have a high potential in the applications of lighting, display devices, and bioimaging.
研究领域:
材料科学
·
光学
·
生物成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL LETTERS
·
2020
·
IF 1.467
Bing Bai,Ze Zhang,Xiaowei Zhao
Adsorption offers an efficient and eco-friendly method for the recovery of rare earth elements (REEs). However, it is not well known that most adsorbents are not eco-friendly. Rational design of next generation adsorbents should aim to enhance their green properties. In this work, sepiolite, Fe3O4 and itaconic acid were selected as the green raw materials. Poly(itaconic acid)/magnetite sepiolite composite (PIA/MSEP) was prepared using water as the solvent under mild reaction conditions and the entire process uses neither the bulk use of toxic organic solvents nor the addition of dangerous strong acid or alkali. The results indicate that PIA/MSEP has satisfactory maximum adsorption capacities of 178.57, 151.52 and 106.38 mg·g−1 for Er3+, Nd3+ and Ce3+, respectively, with excellent regeneration stability. The PIA/MSEP exhibits outstanding adsorption rates that provide above 90% capacity within 10 min for Er3+ and Nd3+. This versatile material is a potential candidate for applications in the removal of REEs.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 10
·4090-4099
·
IF 8.1
Yang Kaidong,Yang Yating,Sun Dongquan,Li Shihua,Song Xiaorong,Yang Huanghao
X-ray nanoscintillator-based photoresponsive therapy is emerging as a promising strategy to treat in vivo tumors, necessitating the development of nanoscintillators with X-ray-excited luminescence in the ultraviolet region (UV-XEL) for the photoactivation of therapeutic precursors. However, it remains a challenge to achieve high-efficiency X-ray-activated tumor therapy due to the limited UV-XEL efficacy. Herein, we developed novel Gd 3+ /Ce 3+ -codoped LiLuF 4 nanoscintillators with strong UV-XEL for in vivo tumor therapy. Significantly, through optimization of host materials, dopants, and energy transfer process, the developed nanoscintillators enabled effective enhancement of UV-XEL (up to 18-fold) as compared with the traditional Ce 3+ -doped counterparts. As a proof-of-concept study to evaluate the in vivo therapeutic applications of the nanoscintillators, we integrated them with nitric oxide (NO) precursors for controllably generating NO upon the X-ray exposure, achieving superior in vivo antitumor effect upon X-ray-induced synergetic NO therapy and radiotherapy. Moreover, X-ray-activated NO therapy can inhibit tumor metastasis into liver to suppress tumor regrowth and prolong mice survival. This work might motivate future development of X-ray nanoscintillators for treating diseases in deep tissue.
研究领域:
生物医学工程
·
放射治疗学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Hanzhen Xiong,Xiaoyan He,Tong Lou,Xiuqin Bai
Cerium oxide (CeO 2 ), with haloperoxidase mimic activity, has attracted attention because it can break through many limitations of biological enzymes as a green and efficient antibacterial agent. However, low Ce 3+ concentration in CeO 2 restricts the activities of haloperoxidase mimicry, which hinders its application. Here, CeO 2 was loaded onto carbon nanotubes (CNTs), where dopamine hydrochloride (DA) was polymerized as the "linker" and CNTs the "skeleton." Two types of samples, termed CeO 2 -CNT (CeO 2 49@PDA/CNT and CeO 2 77@PDA/CNT), were prepared and CeO 2 was found to be uniformly distributed on CNTs, and their Ce 3+ and oxygen (O) vacancy concentrations analyzed. CeO 2 77@PDA/CNT, with the higher Ce 3+ and O vacancy concentration, showed excellent antibacterial performance, up to 98.03%. This study demonstrated a method for enhancing the activities of haloperoxidase mimicry and antibacterial performance of CeO 2 with CNTs as the skeleton.
研究领域:
纳米技术
·
材料科学
·
生物医学工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jianing Wang,Hongcai Yu,Yunhui Min,Shulin Chen,Xiaotian Li,Ruihong Liang,Zhiyong Zhou,Bin Yang
Calcium bismuth niobate (CBN), known for its high Curie temperature ( T C ), has been investigated as a potential material for vibration sensor due to its ability to operate at elevated temperatures. However, the inherent weakness in piezoresponse of CBN has limited its sensing performance. In this study, a pseudo-tetragonal distortion in CBN was successfully induced by incorporating Ce 3+ ions into the (Bi 2 O 2 ) 2+ layers of CBN. This modification led to a change in the interaction between the perovskite and bismuth layers, resulting in enhanced piezoelectric and ferroelectric properties. Further enhancement was achieved by introducing Mn 4+ ions into the Ce 3+ -doped CBN. The co-doped CaBi 1.96 Ce 0.04 Nb 1.985 Mn 0.015 O 9 demonstrated a significantly improved piezoelectric coefficient ( d 33 ) of 15.9 pC/N, compared to 6.8 pC/N for pure CBN ceramics, and an increased remnant polarization ( P r ) of 20.78 μC/cm 2 , compared to the 3.83 μC/cm 2 of the pure material. This work not only deepens the understanding of bismuth-layer-structured ferroelectrics (BLSFs) but also presents a viable co-doping strategy to enhance the piezoresponse in CBN ceramics. This strategy could pave the way for the development of high-performance, high-temperature vibration sensors and potentially lead to the discovery of more novel BLSFs with superior performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Chengyue Li,Xia Cai,Yaochun Qiang,Xuesong Shi,Yujia Jiang,Yan Chen,Fengqin Lai,Bo Wang,Yifan Leng,Weixiong You
Blue-light activated long afterglow luminescence phosphors have attracted much attention because of their potential application in many fields. Herein, the influence of trap depth and the quantity of electrons captured by the traps on the long afterglow luminescence properties were systematically revealed through a comparative analysis of the long afterglow luminescence performance of the series of Y 3 Al 5-x Ga x O 12 (YAGG):Ce 3+ , Cr 3+ (x = 0, 1, 2, 3, 4, 5) phosphors. To achieve long afterglow luminescence, it requires that the traps can effectively capture electrons, and possess an appropriate trap depth. Additionally, it is discovered that the quantity of electrons captured by the traps is the main factor affecting the duration of long afterglow luminescence. The more electrons are captured, the longer the afterglow lasts. The quantity of trapped electrons is inversely proportional to the energy differences between CB M -Ce 5d and trap depth. The sample exhibits the high quantity of trapped electrons attributable to its small energy differences which allows electrons to be directly captured by traps through the tunneling effect. On this basis, the effects of crystal field splitting (ε cfs ), centroid shift (ε c ), and the degree of dodecahedral distortion (D (YO)) on trap depth (E T ) were discussed to manipulate the trap depth, demonstrating there is a significant positive correlation between ε c -ε cfs (2(1-10D(YO))) and E T values for the garnet structure A 3 B 2 C 3 O 12 , when the ion doped at the A-position remains constant and the ions at the B and C positions vary. Notably, A larger D (YO) value corresponds to a deeper trap depth. This study provides a new perspective toward the development and design of long afterglow materials with superior afterglow emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Ying Lv,Wuqiang Li,Chaofeng Li,Yu Liu,Cunjian Lin,Zhongyuan Li,Shihai You
The commercial blue persistent luminescent (PersL) phosphor (CaAl2O4:Eu2+,Nd3+) is renowned for its exceptional PersL duration, but it is hampered by its poor chemical stability. There is an urgent need to develop blue PersL phosphors that can combine the excellent PersL property with robust stability. In this work, we report on a series of highly stable Ce3+-doped oxynitride PersL phosphors. Notably, BaSi3Al3O4N5:Ce3+ has been identified to contain two distinct types of defects in the host: one associated with photoluminescence (PL) and the other with electron trapping and detrapping dynamics. These intrinsic defects have been systematically investigated and confirmed by analyzing both PL and PersL spectra, which could be generated by nitrogen deficiency and the existing oxygen vacancy in BaSi3Al3O4N5. BaSi3Al3O4N5:Ce3+ has a widely distributed trap from 0.21 to 1.02 eV, with a peak at 0.63 eV, as determined by the initial rise method. BaSi3Al3O4N5:Ce3+ exhibits not only excellent water-resistance stability but also superior heat-resistant stability. Leveraging its widely distributed traps and great chemical stability, we have successfully demonstrated the optical information storage ability of BaSi3Al3O4N5:Ce3+ by using a gradual optical writing method. This comprehensive study provides valuable insights into the development of stable oxynitride PersL phosphors for potential applications in optoelectronic devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）