JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-11
·
IF 2.8
Chen Yonglin,Wu Haoyi,Li Yanmei,Liu Zhenpeng,Wan Jiangyun,Hu Yihua
A series of novel orange-red emitting tantalate phosphors, Sr 2 Ta 2 O 7 :xEu 3+ (0.01 ≤ × ≤ 0.13) were successfully prepared through the solid-state method at high temperature. Under the excitation of 464 nm, Sr 2 Ta 2 O 7 :Eu 3+ emits orange-red light at 597 nm. The PL spectra of Sr 2 Ta 2 O 7 :Eu 3+ phosphors are ascribed to the 5 D 0 → 7 F J ( J = 0, 1, 2, 3 and 4) transitions of Eu 3+ ions. The optimal doping concentration of Eu 3+ ions was 9 mol%. The optical bandgap of the host was calculated by ultraviolet-visible diffuse reflection spectra (DRS) with a value of 4.73 eV. The emission intensity of phosphors at 423 K still maintains 92% of that at room temperature, which means the material has excellent thermal stability. The chromaticity coordinates of the Sr 2 Ta 2 O 7 :Eu 3+ located in the orange-red region (0.6403, 0.3585). Various results show that Eu 3+ -doped Sr 2 Ta 2 O 7 phosphors have great potential in the field of phosphor conversion white light-emitting diodes (pc-WLEDs).
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高影响因子
IONICS
·
2017
·Vol. 24
·期 9
·2621-2629
·
IF 2.062
Xu Tingting,Li Jiaxin,Gong Ruijuan,Xi Zhenzhen,Huang Tao,Chen Lixin,Ma Tingli
Quasi-solid-state dye-sensitized solar cells (QS-DSSCs) using polymer electrolytes display excellent long-term stability with comparable light to electricity conversion efficiency (PCE). In this paper, poly(methyl methacrylate) (PMMA) is chosen as the template polymer, and polymer viscosity and its weight percentage of PMMA in the I 3
− /I − electrolyte system are optimized considering the competitive factors of the ionic conductivity ( σ ) and gel dimension stability. A systematic study is carried out to study the environmental factors on the ionic conductivity of quasi-solid electrolytes in terms of storage time, thermal stress, and light soaking. In the different temperature range, the polymer presents different aggregation states and molecular motion forms, which results in different conductive mechanism of the gel electrolyte. It could be described by the Arrhenius equation in the sol state and the Vogel–Tammann–Fulcher (VFT) equation on the gel state, respectively. Both the cyclic voltammetry curve and the Tafel polarization curve indicate that the quasi-solid electrolyte exhibits a lower ion diffusion and transport capacity (1.83 × 10 −6 cm 2 /s) than that of the liquid electrolyte (9.15 × 10 −6 cm 2 /s). This work provides new insights about the degradation mechanism of polymer electrolytes for QS-DSSC application.
Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·8149-8156
·
IF 2.478
Yun Rui,Luo Li,He Jingqi,Wang Jiaxi,Li Xiaofen,Zhao Weiren,Nie Zhaogang
Lanthanide-doped system with adjustable multicolor and white up-conversion (UC) emission has been developed in GdVO 4 (GVO): Tm 3+ -Ho 3+ -Yb 3+ /-Nd 3+ phosphors, which are fabricated via a facile solid-state reaction. Herein, we study their phase structures and the Ho 3+ concentration effect on their up-conversion emission. Under 980 nm excitation, the Tm 3+ -Ho 3+ -Yb 3+ tri-doped GVO phosphors exhibit intense luminescence combined with red, green and blue (RGB) emission and the successive energy transfer between Tm 3+ -Ho 3+ -Yb 3+ ions causes a slight shift in the color coordinates of samples with different doping concentrations. Under 808 nm excitation, the color coordinate of the optimum GVO: Tm 3+ -Ho 3+ -Yb 3+ -Nd 3+ phosphor is located at (0.3277, 0.3433), which is closest to the ideal white light emission corresponding to (0.3333, 0.3333). Therefore, it is proved that these phosphors provide potential applications in the fields of displays, lasers and optical telecommunication.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 1
·547-558
·
IF 2.047
Zhou Jian,Ren Sili
The phosphor-converted white light-emitting diode (WLED) has received tremendous attention as a promising alternative to traditional light sources in lighting and displays. Herein, a novel broadband red emitter Ca 2 Sr(PO 4 ) 2 :Mn 2+ was successfully designed and synthesized based on the Sr-alloying and Mn-doping of Ca 3 (PO 4 ) 2 . The phase purity of the materials was verified by x-ray diffraction (XRD) analyses, while a scanning electron microscope (SEM) coupled with an energy-dispersive spectrometer (EDS) was employed to confirm the uniform dopant distribution. XRD Rietveld refinements were further performed to clarify the site occupation of alloying Sr and the Mn dopants. Effective site engineering confined the Mn dopants in a highly symmetric Ca5 site and excluded the immersion of Sr, leading to an extraordinarily long fluorescence lifetime. Density functional theory (DFT) simulations also revealed the good potential of the materials as host matrices for activators such as Mn 2+ . Finally, Ca 2 Sr(PO 4 ) 2 :Mn 2+ was used to fabricate a WLED prototype based on a near-ultraviolet (n-UV) commercial LED chip, which realized a warm white-light emission and high color rendering index (Ra) of 82.9. This WLED was able to survive the long-term stability test while maintaining high luminous efficacy of ~ 60 lm/W within 20 h, showing its great potential in practical applications.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3825-3846
·
IF 3.3
Liu Suyan,Qi Xiaoran,Fan Zhanpeng,Song Jianzheng,Huo Quan
A series of NCDs-decorated hematite@MIL-101(Cr) (marked as HMC) hybrids were innovatively and successfully developed for the highly efficient removal of carbamazepine in this study, which were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, N 2 adsorption–desorption, X-ray photoelectron spectroscopy, etc. And, the successful preparation of the hybrid was directly proved by XRD, FT-IR, SEM, TEM and XPS. N 2 adsorption–desorption result revealed good textural properties of the hybrid. The evaluation results indicated that the as-prepared hybrids possessed markedly promoted removal performances for CBZ. Compared with other hybrids, 0.3HMC2 with introducing FeCl 3 ·6H 2 O (0.3 g) and NCDs (2 mL) presented an optimum adsorption–photocatalysis coupling effects. The photodegradation efficiency over the hybrid was able to reach 100% within 60 min under visible-light irradiation. The excellent performances should be ascribed to good textural properties, π – π interaction formation, fast electron separation nature of NCDs and internal Z-scheme construction between hematite and MIL-101(Cr) phases. Meanwhile, the hybrid 0.3HMC2 showed good stability and reusability for photocatalytic degradation of CBZ. Furthermore, a possible mechanism for the removal of CBZ was also proposed to illustrate the photodegradation process. It is thus clear that the hybrid HMC is a promising catalyst for the removal of CBZ in wastewater.
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高影响因子
IONICS
·
2024
·
IF 2.4
Liu Xiaowu,Liu Kun,Liu Renyong,Zhang Jian,Hao Hequn,Jin Juncheng,Chen Xin
Flexible electrode is an important part of wearable electronics. Herein, flexible Prussian blue@Carbon nanofibers electrode is fabricated using electrospun carbon nanofiber as electron-donating agents and carbon skeletons. Cubic-shaped Prussian blue with an edge length of 140 nm is in situ deposited on the surface of carbon nanofibers by slow co-precipitation process. The unique design not only obtains the core–shell structure, which is efficient to shorten the diffusion path of sodium ions and improve the electronic conductivity, but also effectively improves the crystallinity of Prussian blue, which is conducive to the improvement of specific capacity and cyclic life. The flexible electrode exhibits superior sodium storage properties including excellent cycling stability (89 mAh g −1 after 2000 cycles at 10C with a considerable capacity retention of 92%) and exceptional rate capability (a capacity up to 90.2 mAh g −1 even at an ultrahigh current density of 50 C). In addition, the self-supporting structure effectively improves the overall energy density of the battery. The strategy using the electron-donating properties of carbon nanofibers open new perspectives to construct other flexible electrodes.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 4
·1-12
·
IF 2.6
Liu Yunhe,Fang Xiya,Feng Zongze,Zhang Xiaotao,Wang Honggen,Shi Yan
Herein, we developed a reversible complexation mediated polymerization (RCMP) starting with a complex of iodine and organic salt as a deactivator and a thermal initiator for continuous regeneration of the organic salt activator. This novel polymerization method can be called as initiators for continuous activator regeneration (ICAR) RCMP, as inspired by the denomination of ICAR ATRP. The synthesis of poly (methyl methacrylate) (PMMA) ( M w / M n < 1.3) with good controllability was achieved via this technique when the concentration of the deactivator complex was as low as dozens of ppm. The studied three kinds of iodine complexes showed high control on the polymerization of MMA. The effects of initiator and deactivator complex concentration on the polymerization process were researched in detail. Furthermore, the accessibility of PMMA prepared by ICAR RCMP to chain extension and block copolymerization confirmed that this novel polymerization approach afforded polymers with high chain-end fidelity. The substantial decrease in the concentration of deactivator complex or activator plays a critical role for the production and application of well-defined polymer prepared by this method.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 6
·3089-3099
·
IF 2.2
Zhao Wenxia,Hui Kaihong,Zhao Wei,Chen Huaijun,Cui Yubo,Li Xinwei,Liu Xin,Song Yifan,Hui Kaining,Yan Yani,Qiao Liang,Wang Zenglin
The effects of additives on the deposition rate, surface morphology, Ni and P elemental content of the electroless plating layer, and roughness of the electroless plating Ni-P layer were investigated. In an electroless plating Ni-P system, ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and sodium hypophosphite monohydrate were used as the complexing agent and reductant, respectively. The linear sweep voltammetry (LSV) polarization curve results showed that the compound addition of 1.0 mg L −1 L-tyrosine, 2.0 g L −1 saccharin, and 6.0 mg L −1 sodium dodecyl sulfate (SDS) could inhibit sodium hypophosphite oxidation and nickel ion reduction, which eventually reduced the Ni-P deposition rate. The Tafel polarization curves indicated that the compound additives obviously improved the corrosion resistance of the Ni-P electroless plating layer. Field emission scanning electron microscopy (SEM) images showed that the composite additives generated fine and uniform Ni-P electroless plating particles and enhanced the density, eliminated the surface cracks, and reduced the pinholes on the electroless plating layer surface. Atomic force microscopy (AFM) tests showed that the addition of complex additives improved the smoothness of the plated layer, the R a value was reduced from 135.0 nm to 53.2 nm, and the R q value was reduced from 164.0 nm to 93.0 nm. The final composition and implementation conditions of the EDTA-2Na-based Ni-P electroless plating system were determined. The deposition rate was 10.44 μm h −1 , the P content of the electroless plating layer was 2.2%, and the electroless plating player was silver-white and bright. Graphical Abstract
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高影响因子
Science China-Materials
·
2022
·Vol. 65
·期 6
·1594-1600
·
IF 8.64
Peng Hui,Tian Ye,Yu Zongmian,Wang Xinxin,Ke Bao,Zhao Yueting,Dong Tiantian,Wang Jianping,Zou Bingsuo
Zero-dimensional (0D) metal halides are in a blossoming status for their fascinating optoelectronic properties. Herein, an antimony-based metal halide of (C 16 H 28 N) 2 SbCl 5 (C 16 H 28 N + = benzyltripropylammonium cations), where the isolated [SbCl 5 ] 2− clusters are surrounded by C 16 H 28 N + to form a 0D square-pyramidal structure, was synthesized and investigated. The (C 16 H 28 N) 2 SbCl 5 exhibited a broadband orange emission at 633 nm upon the low-energy irradiation (400 nm) with a near-unity photoluminescence quantum efficiency (97.8%). Interestingly, (C 16 H 28 N) 2 SbCl 5 showed an additional emission peak at 477 nm upon the higher-energy irradiation (300 nm), which is attributed to the transformation of the doublet of spin-orbit couplings into two independent self-trapped excitons (STEs). Temperature-dependent Raman spectra clearly revealed the characteristics of multi-phonon coupling, demonstrating a strong anharmonic electron-phonon interaction in (C 16 H 28 N) 2 SbCl 5 . Temperature-dependent emission spectra and density functional theory results illustrated that the observed dual-band emission originated from singlet and triplet STEs in [SbCl 5 ] 2− units. Combined with the efficient emission and excellent stability of (C 16 H 28 N) 2 SbCl 5 , a stable white-light-emitting diode with an ultra-high color rendering index of 96.6 was fabricated.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 7
·2065-2074
·
IF 2.482
Yang Hong,Wu Sen,Chen Zhengfei,Li Lichun,Wang Haili,Liu Bing,Tang Haodong,Li Ying,Chen Aimin,Han Wenfeng
The AlF 3 catalysts with controlled morphology (cubic, hexahedron and octahedron) were synthesized via hydrothermal method using different solvents. The dehydrofluorination of 1,1,1,3,3-pentafluoropropane (HFC-245fa) was used as the model reaction to evaluate the catalytic performance of the AlF 3 catalysts with different morphology. Results showed that surface area, crystal structure, surface acidic properties together with the chemical composition of the AlF 3 catalyst were substantially influenced by the different morphology. XRD results showed that κ-AlF 3 crystalline structure was formed when using ethanol as solvent while β-AlF 3 crystalline structure was formed when using water as solvent. Among the three prepared AlF 3 samples, the AlF 3 -C catalyst with cubic shape demonstrated not only largest surface area but also most amount of medium-strength surface acid sites, resulting in enhanced reaction activity towards the dehydrofluorination reaction. The characteristic high Miller index crystal planes of (402) and (321) exposed on the cubic shaped AlF 3 -C catalyst is believed to be the main reason accounting for the high catalytic performance as there are equal amount of Al and F atoms exposed. Moreover, a reaction mechanism describing dedehydrofluorination of HFC-245fa on AlF 3 catalyst with equal amount of Al and F atoms exposed on certain crystal planes was proposed. Graphic Abstract
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高影响因子
Cell Death Discovery
·
2024
·Vol. 10
·期 1
·1-12
·
IF 6.1
Fan Chunhong,Wu Haotian,Du Xin,Li Canjun,Zeng Wenping,Qu Lili,Cang Chunlei
Cancer stem cells (CSCs) are a sub-population of cells possessing high tumorigenic potential, which contribute to therapeutic resistance, metastasis and recurrence. Eradication of CSCs is widely recognized as a crucial factor in improving patient prognosis, yet the effective targeting of these cells remains a major challenge. Here, we show that the lysosomal cation channel TRPML1 represents a promising target for CSCs. TRPML1 is highly expressed in breast cancer cells and exhibits sensitivity to salinomycin, a drug known to selectively eliminate CSCs. Pharmacological inhibition and genetic depletion of TRPML1 promote ferroptosis in breast CSCs, reduce their stemness, and enhance the sensitivity of breast cancer cells to chemotherapy drug doxorubicin. The inhibition and knockout of TRPML1 also demonstrate significant suppression of tumor formation and growth in the mouse xenograft model. These findings suggest that targeting TRPML1 to eliminate CSCs may be an effective strategy for the treatment of breast cancer.
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 12
·1-16
·
IF 2.8
Wang Fenglin,Mao Haijun,Chen Xingyu,Li Wei,Liu Zhuofeng,Zhang Weijun,Bai Shuxin
In this work, A -site Nd doped BaTiO 3 ceramics in the form of Ba 1− x Nd 2 x /3 TiO 3 with a wide substitution level range of x = 0–0.2 have been prepared via solid-state reaction method. Powder X-ray diffraction results reveal that Nd is completely incorporated into the BaTiO 3 lattice in all specimens. Further analyses based on Rietveld refinement suggest that tetragonal and pseudo-cubic phases coexist in Ba 1− x Nd 2 x /3 TiO 3 ceramics with x ≤ 0.06, and the amount of tetragonal phase is raised with the increase of x value. When x value is larger than 0.08, only pseudo-cubic is observed. The generated \(V^{\prime\prime}_{{{\text{Ba}}}}\) , \({\text{Nd}}_{{{\text{Ba}}}}^{\cdot }\) and \(V_{{\text{O}}}^{{\cdot \cdot }}\) defects, which are identified by X-ray photoelectron spectra, make the grain size displays a tendency of decrease first mainly due to the pining effect, and then increase ascribed to the accelerate of mass diffuse. By introducing such wide range of substitution level, Ba 1− x Nd 2 x /3 TiO 3 ceramics with colossal dielectric constant ( x = 0.08), temperature-stable dielectric properties ( x = 0.15), especially relaxor behavior ( x = 0.20) noticed for the first time, are, respectively, received, which is closely related to the variation of phases and defects induced by the addition of Nd. This study may provide a special idea to modify BaTiO 3 to satisfy diversified applications by single element with a wide doping range, and could lay the foundation of future works focusing on the various potential applications of Ba 1− x Nd 2 x /3 TiO 3 ceramics.
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高影响因子
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