ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Qianmin Ma,Meng Zhang,Xihan Xu,Ke Meng,Chi Yao,Yufei Zhao,Jie Sun,Yaping Du,Dayong Yang
Supramolecular luminescent hydrogels based on natural molecules have shown high potential for a variety of applications because of unique optical properties and biocompatibility, particularly serving as advanced biomaterials for bioimaging, biosensing, cell engineering, and so forth. A lanthanide complex-based system provides a promising way to prepare supramolecular luminescent hydrogels. Herein, we realize the creation of a luminescent hydrogel assembled from lanthanides and nucleosides. Nucleosides, the essential components of nucleic acids, functioning as the ligands, successfully chelate with lanthanides and form complexes in water. The complexes subsequently serve as building-blocks to form supramolecular hydrogels, which exhibit characteristic luminescent emission of lanthanides. The coordination modes and forming mechanism are studied by electrospray ionization time-of-flight mass spectrometry, matrix-assisted laser desorption/ionization time of flight mass spectrometry, 1H NMR spectroscopy, and Fourier transform infrared spectroscopy; the corresponding molecular simulations are presented, and macro-/micro-morphologies, mechanical properties, and luminescent performances of hydrogels are systemically studied. Remarkably, these luminescent hydrogels show fluorochromic properties in response to external stimuli, including pH, temperature, anions, and cations, which are thus adopted to design smart luminescent switches and detect specific species such as Cu2+. Our work provides a feasible strategy to prepare stimuli-responsive luminescent hydrogels, reveals the diverse potential of nucleoside-based hydrogels, and exhibits a novel pathway for the preparation of smart optical materials.
研究领域:
材料科学
·
生物化学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Hao Liu,Xuan Ge,Qiaodan Hu,Fan Yang,Jianguo Li
La- and Nb-doped BaTi 2 O 5 (BT 2 ) spherical glasses were prepared by a containerless aerodynamic levitation method and their glass-forming regions were established. It is found that La-doping on the Ba-site (network-modifier) and Nb-doping on the Ti-site (network-former) show distinct difference in the glass-forming region: less than 10 % La can replace Ba whereas 40 % Nb can incorporate into BT 2 glass. The distinction in glass-forming ability induced by La- and Nb-doping is discussed mainly from the structural arrangement of the glass. Raman spectroscopy analysis shows that La-doping elongates the short Ti–O bonds in the distorted [TiO 5 ] polyhedra and thus relaxes the network. Nb-doping introduces [NbO 6 ] polyhedra into BT 2 and there exists a critical doping level (20 %), below which incorporation of Nb into BT 2 relaxes the [TiO n ] polyhedra by shortening the long Ti–O bond and above which [NbO 6 ] starts to participate in the network skeleton construction resulting in a dramatic change in the glass structure, which is supported by the dramatic change in the exothermic peak on the DTA curves. This work triggers the speculation that the network-modifiers in BT 2 glass possess a very important role in the structure of network-former skeleton than those in glasses based on traditional network-former oxides such as SiO 2 , GeO 2 and B 2 O 3 , which may provide a useful strategy for modifying the properties of these novel glasses by chemical doping.
研究领域:
材料科学
·
玻璃科学
·
无机化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zhaofa Zheng,Huangjie Lu,Yumin Wang,Hongliang Bao,Zi-Jian Li,Guo-Ping Xiao,Jian Lin,Yuan Qian,Jian-Qiang Wang
Targeted synthesis, through a heteroleptic methodology, has resulted in three types of lanthanide (Ln) coordination polymers (CPs) with tailored dimensionality, tunable photoluminescent colors, and distinct luminescence quenching upon UV and X-ray irradiation. The homoleptic Ln(tpbz)(NO3)2 [CP-1; tpbz = 4-(2,2′:6′,2″-terpyridin-4′-yl)benzoate] is assembled from Ln cations and bridging tpbz ligands, accompanied by the decoration of NO3– anions, forming a one-dimensional (1D) chain structure. The presence of ancillary dicarboxylate linkers, 1,4-benzenedicarboxylate (bdc) and 2,5-thiophenedicarboxylate (tdc), promotes additional bridging between 1D chains to form a two-dimensional layer and a three-dimensional framework for Ln(tpbz)(bdc) (CP-2) and Ln(tpbz)(tdc) (CP-3), respectively. The multicolor and luminescence properties of the obtained CPs were investigated, displaying typical red EuIII-based and green TbIII-based emissions. The SmIII-bearing CP-1–CP-3, however, exhibit diverse ratiometric LnIII- and ligand-based emissions, with the photoluminescent colors varying from pink to orange to cyan. Notably, the TbIII-containing CP-1–CP-3 display distinct luminescence quenching upon continuous exposure to UV and X-ray irradiation. To our best knowledge, CP-2-Tb represents one of the most sensitive UV dosage probes (3.2 × 10–7 J) among all CPs.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yicheng Zeng,Biwei Qiu,FangFang Wang,Lei Zhou,Ying Li
Two kinds of hybrid luminescence films ([C 8 VIM][Eu (nta) 4 ]@PMMA and [C 8 VIM][Tb (acac) 4 ]@PMMA) have been synthesized by the copolymerization of MMA with lanthanide functionalized ionic liquid [C 8 VIM][Eu (nta) 4 ]. The structure and composition of the as-synthesized films have been characterized by 1 HNMR, XPS , FTIR, UV–vis, XRD , TGA and SEM. In addition, the photophysical properties of as-synthesized films have been investigated in detail by luminescence spectroscopy. It was found that the transparent and thermal stability of as-synthesized films are improved by the long chains of PMMA . More significantly, [C 8 VIM][Eu (nta) 4 ] @PMMA exhibits the improvement of photo physical properties (ƞ = 52.6%) and is selected as the representative sample to examine the potential fluorescence sensing of metal ions and anions. It has been showed highly selective and sensitive fluorescence sensing for Cu 2+ and CrO 4 2− . Meanwhile, [C 8 VIM][Eu (nta) 4 ]@PMMA exhibits a good stability in the aqueous solution, which is further used as fluorescence probe for detecting CO 3 2− . The good stability, sensitive fluorescence response and good mechanical processing properties of [C 8 VIM][Eu (nta) 4 ]@PMMA show a great potential to establish a fast response anion and cationic of aqueous solution fluorescence colorimetric sensor devices.
研究领域:
材料科学
·
光学
·
分析化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Xiao Wang,Mei-Hong Liu,Qing Xu,De-Long Zhang,Pei Zhang,Wing-Han Wong
Er 3+ -doped NaLa(WO 4 ) 2 is a promising phosphor material for applications in many fields including the ratiometric thermometry based on thermal effect of fluorescence intensity ratio (FIR) of green fluorescence of Er 3+ , which is directly correlated with Judd-Ofelt parameters Ω i (i = 2, 4, 6). Present paper reports synthesis and Judd-Ofelt spectroscopic properties of Er 3+ -doped NaLa(WO 4 ) 2 µm-sized phosphor. The phosphor was synthesized by solid-state chemical reaction and characterized by X-ray diffraction and Raman scattering techniques. The results show that the phosphor is dominated by NaLa(WO 4 ) 2 crystalline phase and has a maximum phonon energy 927 cm −1 . Judd-Ofelt analysis was done for the phosphor using a safe, reliable method based on diffuse reflection spectrum and Er 3+ 1.5 μm fluorescence lifetime . First, diffuse reflection spectrum of the phosphor was measured and relative absorption spectrum was calibrated from it using Kubelka-Munk theory. Second, Er 3+ 1.5 μm fluorescence lifetime of the phosphor was measured and absorption cross-section spectrum was obtained based on the assumption that the 1.5 μm emission has 100% quantum efficiency. Finally, based on the absorption cross-section spectrum, standard Judd-Ofelt analysis was carried out to extract the Ω i . Radiative rate, fluorescent branch ratio and radiative lifetime of some transitions have been obtained from the known Ω i values. In addition, FIR proportional factor was evaluated in terms of Ω i and compared with those values of other materials. The result shows that the phosphor has a better prospect for the application in ratiometric thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yi Cao,Peiyuan Tang,Wenfeng Qiu,Tong Zhao
Flexible all-solid-state supercapacitors have drawn more attention owing to the rapid growth of wearable electronic equipments. Herein, we have succeeded in synthesizing a series of Y-doped lanthanum titanate flexible self-supporting films (LSF-x, 0.1 ≤ x ≤ 0.5) and investigating the change of microstructures, morphological characteristics, and lattice structures of these films affected by different Y-doping contents. To further determine the optimum Y-doping content, we have explored the electrochemical properties of working electrodes prepared by LSF-x (0.1 ≤ x ≤ 0.5) samples as the main active material. As the LSF-0.2 electrode has the best areal capacitance of 1.3 F·cm–2 at 2 mA·cm–2, we use the LSF-0.2 electrodes and PVA–Na2SO4 gel to fabricate a flexible all-solid-state supercapacitor device. This device has a high areal capacitance of 255.9 mF·cm–2 at a current density of 2 mA·cm–2 with a high cell voltage of 2.1 V, while the corresponding energy density is 156.8 μWh·cm–2 with a power density of 2.1 mW·cm–2. Moreover, it also shows a long cycling life and outstanding flexibility. Therefore, the LSF-0.2 sample can be used as an excellent energy-storage material for a wearable electronic device.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
DOI
高影响因子
RADIOCHIMICA ACTA
·
2019
·Vol. 108
·期 3
·195-206
·
IF 1.339
Kun Tian,Shuting Zhuang,Jinling Wu,Jianlong Wang
A two-dimensional lanthanum(III) porous coordination polymer was prepared, characterized and applied as an efficient adsorbent for the removal of uranium from aqueous solution. Lanthanum(III) was the metal center of MOFs, and the deprotonated anions of pyridine-2,6-dicarboxylic acid (H 2 PDA), PDA 2− was the organic ligand, this MOF was name as La-PDA, which was synthesized by hydrothermal reaction method. Scanning electron microscope (SEM), Fourier transform infrared (FTIR), powder X-ray diffraction (PXRD) and thermal gravimetric (TG) analysis were used for characterization, and the results indicated that the La-PDA composites were successfully prepared. Compared with traditional adsorbents of uranium, La-PDA showed excellent adsorption properties. The adsorption capacity was 247.6 mg g −1 at 298 K and pH 4.0. The adsorption equilibrium achieved within 120 min, and the adsorption process was exothermic and spontaneous. The absorption mechanism of La-PDA was also explored, from the XPS spectra, the pyridine-like nitrogen atoms (C=N–C) and carboxyl oxygen atoms (–COO–) contributed to the adsorption of uranium. The results suggested that PDA 2− was a potential ligand of uranium adsorption, La-PDA composites were effective adsorbents for the removal of uranium from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 3
·564-572
·
IF 3.382
Yini Mao,Li Jiang,Rui Ye,Jun Yang,Shanshan Hu
Lanthanide-doped Ba2LaF7 nanocrystals were successfully synthesized via a one-step hydrothermal method. The phase, size and shape of the lanthanide-doped Ba2LaF7 nanocrystals were systematically investigated by controlling the fluorine source, additive, lanthanide doping, synthesis method and temperature. Regular hexagonal Ba2LaF7 nanocrystals with a side length of 60 nm were obtained by using NaBF4 as the fluorine source. A variety of lanthanide ions (Ho3+, Er3+, Tm3+, Dy3+, Eu3+, Tb3+, Ce3+, and Sm3+) was successfully doped into the Ba2LaF7 host, which showed abundant luminescent colors due to the intrinsic emission of the lanthanide ions. Because of the emission spectrum of Tb3+ (5D4 → 7Fj) having obvious overlap with the Eu3+ excitation spectrum (7F0,1 → 5D0,1,2), the excited state energy of Tb3+ can be transferred to Eu3+. Under ultraviolet excitation, the energy transfer from Tb3+ to Eu3+ in the Ba2LaF7 matrix occurs mainly via the dipole–quadrupole mechanism. The regulation of luminescent color was achieved from green to warm yellow to yellow orange and finally to red by changing the doping concentration of Eu3+ ions from 0.1% to 7%, respectively. The obtained Ba2LaF7:Ln3+ nanocrystals have potential application in multicolor lighting and displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2013
·Vol. 2013
·期 16
·2963-2970
·
IF 3.12
Yan-Jing Gu,Bing Yan
Graphical Ln 3+ (Eu 3+ , Nd 3+ , Yb 3+ ) organic–inorganic mesoporous hybrid materials are prepared. The hybrids contain lanthanide complexes covalently grafted to 2-methyl-9-hydroxyphenalenone (MHPO) functionalized ordered mesoporous SBA-15 and with 1,10-phenanthroline as a second ligand. The materials exhibit the characteristic visible (Eu 3+ ) and near-infrared (NIR) luminescence (Nd + and Yb 3+ ) of lanthanides. 9-Hydroxy-2-methyl-phenalenone (MHPO) was synthesized and modified with 3-(triethoxysilyl)propyl isocyanate (TEPIC) through a hydrogen atom addition reaction to achieve a new chemical linkage (named as MHPOSi). SBA-15 mesoporous silica organically functionalized with MHPOSi was synthesized. The MHPOSi was linked to tetraethoxysilane (TEOS) through a condensation process in the presence of Pluronic P123 surfactant as a template. New Ln 3+ (Eu 3+ , Nd 3+ , Yb 3+ ) organic–inorganic mesoporous hybrid materials were prepared, in which the Ln 3+ complexes are covalently attached to SBA-15 and have 1,10-phenanthroline (phen) as a second ligand. The resultant mesoporous hybrids were characterized by FTIR spectroscopy, small-angle X-ray diffraction, N 2 adsorption–desorption measurements, thermal analysis, and UV/Vis spectroscopy. They all have high surface areas, uniform mesostructures, and good crystallinity. The photophysical properties of the functionalized mesoporous SBA-15 networks are discussed in detail and they still present excitation capability in the visible region despite the modification of the organic silane. Subsequently, they exhibit characteristic visible (Eu 3+ ) and near-infrared (NIR) luminescence (Nd + and Yb 3+ ).
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 5
·3252-3260
·
IF 3.9
Moke Zhou,Hetuo Chen,Yi He,Guohong Zhou,Shuren Zhang,Bin Tang
In this study, Y 3− x La x Al 5 O 12 (0 ≤ x ≤ 0.09) ceramics were synthesized, and the phase composition, lattice evolution, and microwave dielectric properties were investigated in detail. Scanning electron microscopy confirms that the addition of moderate amounts of La 2 O 3 improves the grain development of YAG ceramics, but excessive doping destabilizes the crystal structure. Transmission electron microscopy characterization shows that the variation of the dielectric properties of the samples with x -value is related to the occurrence of benign dislocation structures caused by modifications in the type and content of the A-site rare-earth ions. The variations in relative density, dielectric constant, and quality factor remain basically coordinated. The optimum microwave dielectric properties of La 3+ doped YAG samples are exhibited as ε r = 10.61, Q × f = 187, 542 GHz, τ f = −31.2 ppm/°C when La 2 O 3 is doped at x = 0.015.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2014
·Vol. 2015
·期 2
·279-287
·
IF 2.965
Chang Liu,Bing Yan
Graphical A series of photoactive polymer hybrid films fabricated with both Ln complexes and ZIF-8 is described. The films show discrete luminescence from ZIF-8 and the Ln complexes, and there is no energy coupling between the two emissive centers. By selective excitation with different wavelengths, the luminescence can be tuned from blue (ZIF-8) to red (Eu 3+ ), green (Tb 3+ ) or yellow (Eu 3+ /Tb 3+ ) and even white by integrating the emission of both Eu 3+ and the polymer unit. A series of photoactive polymer hybrid films fabricated with both lanthanide complexes and ZIF-8 [zeolite imidazole framework, a kind of metal organic framework, Zn(MeIM) 2 , MeIM = 2-methylimidazole] was prepared. ZIF-8 and the lanthanide complexes Ln-L [Ln = Eu, Tb; L = AA (acetylacetonate), phen (1,10-phenanthroline), TAA (trifluoroacetylacetonate), TTA (trifluoroacetylacetonate)] were assembled with the the monomers 4-vinyl pyridine (VPD) and ethylene-methyl acrylate (EMA), forming the final hybrid polymer films after initiation with benzoyl peroxide (BPO). The products are are indicated as PEMA-PVPD⊃Ln-L/ZIF-8 [PEMA-PVPD: copolymer of poly 4-vinyl pyridine (PVPD) and polyethylene-methyl acrylate (PEMA)]. The SEM images of these hybrid films indicate homogeneous dense packing and a high degree of coverage of the crystals on the ITO glass. The luminescent behavior of all the hybrid films was studied in detail. Discrete luminescence of the ZIF-8 unit and the lanthanide complexes was observed in which energy coupling between the two emissive centers does not exist. Therefore, by selectively exciting these hybrid films with different wavelengths, the luminescence colors of them can be tuned from blue (for ZIF-8) to red (for Eu 3+ ), green (for Tb 3+ ), yellow (for Eu 3+ /Tb 3+ ) and even to white by integrating the emission of both Eu 3+ /Tb 3+ into the polymer unit (PEMA-PVPD). These results are useful and have potential application in optical devices for displays or encoding.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Liping Fang,Ru Liu,Ji Li,Cuihong Xu,Li-Zhi Huang,Dongsheng Wang
An effective approach for eutrophication control and phosphate recovery remains a longstanding challenge. Herein, we present a new technique for phosphate sequestration in lake and phosphate recovery using novel magnetically recoverable magnetite/lanthanum hydroxide [M-La(OH) 3 ] hybrids that can be prepared using a simple one-pot synthesis method. Batch studies show that M-La(OH) 3 exhibits a strong sorption towards phosphate with sorption capacities of up to 52.7 mg-P/g at pH 7.0 in water. A simple model indicates that the efficiency of M-La(OH) 3 for phosphate sequestration in lake is significantly attenuated by 34–45% compared to that in water, due to interference from sediment particles. However, our results demonstrate that sediments suspensions mixed with a M-La(OH) 3 content of 1–3% exhibit a capability of up to 1.2 mg-P/g for sequestering external phosphate compared with that of 0.2 mg-P/g for pristine sediment at pH 7.3. M-La(OH) 3 -mixed sediment suspensions appear to effectively sequester phosphate over an environmentally relevant pH range from 4 to 8.5. Phosphorus (P) fractionation experiments indicate that the enhanced phosphate sorption by M-La(OH) 3 -mixed sediment suspensions is mainly due to the increased fractions of NaOH-P and inorganic P. This work indicates that the M-La(OH) 3 has the potential for phosphate sequestration and recovery from lake.
研究领域:
环境科学
·
水体富营养化控制
·
环境功能材料
·
污染生态学
·
资源回收
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）