CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shigang Hu,Mulan Liu,Song Wang,Shaobing Wu,Dong Zhu
The use of InGaN/GaN blue light chips to excite surface-coated yellow phosphors is one of the common strategies for the preparation of WLEDs. In this study, a series (Y,Gd) 3 Al 5 O 12 ((Y,Gd)AG) phosphors doped with different concentrations of Ce 3+ were prepared using the co-precipitation method. The yellow light emission intensity of the phosphor reaches its maximum at a Ce 3+ concentration of 5 %. This observation is consistent with theoretically quenching concentration (4.7 %) calculated by the Stern - Volmer formula and the optimal quantum yield (69.18 %). Further research indicates that the emission efficiency of the sample remains almost same after 7 days and maintained room temperature efficiency of 67 % at 400 K, with a color temperature value of 2662 K and a CRI value superior to that of YAG:Ce. The results TR-PL tests showed that when the concentration of Ce 3+ doping was gradually increased up 5 %, the distance between the emission centers becomes shorter, which leads to a decrease in the emission lifetime and thereby improves the luminous efficiency. When the concentration exceeds 5 %, concentration quenching leads to an increase in non-radiative processes, and this quenching mechanism is identified as energy transfer between Ce 3+ - Ce 3+ ions. This result provides ideas for obtaining highly efficient yellow phosphors, and also provides a realization path for improving the performance of CCTs and CRIs in WLEDs.
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JOURNAL OF ELECTRONIC MATERIALS
·
2026
·
IF 2.8
Yue Lei,Wan Yu,Wang Yanting,Feng Changhao
Effective detection of n -butanol is essential for human health and environmental protection. Bismuth ferrite is a gas-sensitive material candidate with excellent potential, and rare earth element doping is an effective modification strategy to enhance the gas-sensitive performances of gas sensors. In this work, a series of Y-doped BiFeO 3 nanofibers (BFO, 1% Y-BFO, 3% Y-BFO, and 5% Y-BFO) were prepared by electrospinning. Among them, the gas sensors based on 3% Y-BFO nanofibers exhibited significantly enhanced gas-sensing performances for n -butanol. At an optimum operating temperature of 150°C, the synthesized 3% Y-BFO sensor has a response of 60.2 and a response/recovery time of 9/47 s for 100 ppm n -butanol. In addition, it has a lower limit of detection as low as 0.5 ppm and excellent repeatability. Therefore, gas sensors based on Y-doped BiFeO 3 nanofibers represent a promising solution for the efficient detection of n -butanol.
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ENERGY & FUELS
·
2023
·
IF 5.3
Guolin Cao,Zhuomin Jin,Yuebing Dong,Qiyong Shi
LiNi0.8Co0.1Mn0.1O2 (NCM811) is considered a cathode material with great commercial potential. However, Li/Ni mixing, residual lithium compounds, and side reaction limited the popularity of Ni-rich batteries. Thus, a simple strategy is employed to realize a comodification of Na+ and Y3+. As demonstrated in the XPS results, the residual lithium compounds (Li2CO3/LiOH) and side reaction products are inhibited. The capacity retention rate of the modified NCM811 is 86.4% after 300 cycles at 1C, 34.5% higher than that of the pristine. Na+ expands the space of the Li+ slab, thereby reducing the charge transfer resistance and inhibiting the mixed discharge of cations. Meanwhile, Y3+ decreased the lattice along c-axis to restrict the movement of cations (Ni2+) into the Li site, with improving the exchange of Li+. The formed LiYO2 coating layer restrains the direct contact between the electrolyte and the electrode material so that side reactions are inhibited, reducing the electrochemical resistance.
研究领域:
材料科学
·
电化学
·
储能技术
·
锂离子电池
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 10
·2213-2220
·
IF 7.779
Dali Zhu,Linying Wang,Wenhao Cui,Juan Tan,Peng Tian,Zhongmin Liu
A facile solid seed assisted strategy has been developed for the synthesis of high silica zeolite Y. The crystal growth kinetics as a function of seed usage were studied, showing a positive relationship with the seed addition. A smaller seed size and higher seed SAR were found to be favorable for the crystallization of high silica zeolite Y. FTIR spectra revealed that the acidic hydroxyls in small SOD cages of high silica zeolite Y can transfer to supercages under the induction of pyridine, while this phenomenon is inconspicuous for conventional zeolite Y, which suggests the incremental utilization of the acid sites in the SOD cages following the increase of framework SAR. The high silica S-SY product possesses a larger amount of acid sites, higher acid strength and excellent (hydro)thermal stability, and thus exhibits higher catalytic cracking activity for model molecules and industrial heavy oil, which imply its promising future as a cracking catalyst for bulky hydrocarbons.
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高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 18
·期 2
·e2863
·
IF 1.777
Jingyi Wang,Lili Cai,Zhongwei Cao,Xuefeng Zhu,Weishen Yang
Oxidative coupling of methane (OCM) is an effective route for methane direct conversion to ethylene. Perovskite oxides (ABO 3 ) with variable properties are potential catalysts for OCM by adjusting the compositions. In this study, four perovskite catalysts, BaMO 3-δ and BaM 1-x Y x O 3-δ (M = Zr, Ce; x = 0.2), were prepared by the sol–gel method to explore their catalytic performance of OCM. All catalysts are active toward OCM and reach the highest catalytic performance at 800°C. The OCM performance of Ce-based catalysts is higher than that of Zr-based catalysts. The selectivity of C 2 compounds is significantly improved by Y-doping. At CH 4 /O 2 mol ratio of 8, a C 2 selectivity of 67% was achieved on BaCe 0.8 Y 0.2 O 3-δ . Compared with Zr-based catalysts, more amounts of active oxygen species, which are beneficial to OCM, were observed on BaCeO 3-δ and BaCe 0.8 Y 0.2 O 3-δ . Meanwhile, higher contents of moderate and strong basic sites, which are beneficial to OCM, were found on the Y-doped catalysts. This is attributed to the generation of oxygen vacancies caused by Y-doping in the B-site. Therefore, BaCe 0.8 Y 0.2 O 3-δ with more active oxygen species and stronger basicity exhibits the highest performance among the four catalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qiang Zhang,Hongjuan Zhao,Xingyu Liu,Rui Li,Tian Xia,Yue Ma,Yuren Wang,Kang Chen,Jiujiang Wang,Penghui Zeng,Honghai Liu,Chaowei Liu,Xionghou Gao,Chunming Xu,Baojian Shen
It's a dream to make zeolites more stable so as to keep the activity and stability of the catalyst. Phosphorus modification is an effective method, however, the known post-modification predominantly presents as non-framework P, and the P-loss is a big trouble in application. We have discovered that in the reaction of PCl 3 or SiCl 4 + PCl 3 with NaY zeolite, a portion of P enters the framework of the zeolite, forming a PO 4 -AlO 4 structure. Further investigations revealed that P cannot be incorporated into the framework through P for Al isomorphous substitution, but rather through isomorphous substitution with Si(4Al). PCl 3 exhibits two effects in reaction: at lower quantities, it mainly undergoes isomorphous substitution with Si(4Al); at higher quantities, it leads to zeolite dealumination generating aluminum vacancies, which disrupt the zeolite framework or promotes Si for Al isomorphous substitution. After hydrothermal aging at 800 °C for 4 h, the stable presence of framework PO 4 -AlO 4 implies that the weakest site Si(4Al) becomes the more stable site P(4Al) in the Y zeolite framework. Compared with the JPY (prepared by impregnating (NH 4 ) 2 HPO 4 solution to high silica Y zeolite) sample, after 10 cycles of hydrothermal and water washing treatment, the P 2 O 5 loss rate of DPY (prepared by SiCl 4 + PCl 3 with NaY) zeolite ranged from 0.4 % to 3.5 %, significantly lower compared to the range of 18.7 % to 25.9 % observed in the JPY sample. This indicates that in DPY zeolite, the interaction between P and the zeolite is stronger and less prone to loss. Moreover, P is more uniformly distributed on the surface and bulk phase of DPY than JPY sample.
研究领域:
材料科学
·
催化化学
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INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Wenlong Yin,Wendong Wang,Lei Bai,Kai Feng,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The 12 new rare-earth tellurides Ba2MLnTe5 (M = Ga and Ln = Sm, Gd, Dy, Er, Y; M = In and Ln = Ce, Nd, Sm, Gd, Dy, Er, Y) have been synthesized by solid-state reactions. The two compounds Ba2GaLnTe5 (Ln = Sm, Gd) are isostructural and crystallize in the centrosymmetric space group P1̅, while the other 10 compounds belong to another structure type in the noncentrosymmetric space group Cmc21. In both structure types, there are one-dimensional anionic 1∞[MLnTe5]4– chains built from LnTe6 octahedra and MTe4 (M = Ga, In) tetrahedra, but the connectivity between the LnTe6 octahedra and MTe4 tetrahedra is different for the two structure types. On the basis of the diffuse-reflectance spectra, the band gaps are around 1.1–1.3 eV for these compounds. The Ba2MLnTe5 (M = Ga and Ln = Gd, Dy; M = In and Ln = Gd, Dy, Er) compounds are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmTe5 deviates from the Curie–Weiss law. In addition, electronic structure calculation on Ba2MYTe5 (M = Ga, In) indicates that they are both direct-gap semiconductors with large nonlinear-optical coefficients.
研究领域:
材料科学
·
凝聚态物理
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DOI
PubMed
高影响因子
PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 3
·035924
·
IF 2.6
Ke Zhao,Jianzhao Cao,Ying Qi,Peng Wei,Jian Cheng,Yahong Xie
In our study, we selected three prevalent coal types from Xinjiang: Dahuangshan coal (referred to as Y-coal), Black Mountain coal (B-coal), and Kuche coal (K-coal). Initially, we assessed their morphological differences using electron microscopy. Subsequently, we evaluated the superiority of Y-coal through Thermogravimetric Analysis (TGA). Furthermore, we compared their performances using various electrochemical tests, including the J-V curve, dark current curve, open-circuit voltage curve, and Electrochemical Impedance Spectroscopy (EIS) curve. Ultimately, we investigated the potential of synthesizing graphene from Y-coal and its derivatives. The first step was the preparation of multilayer graphene (MG) by treating Y-coal with acid to obtain demineralized coal, followed by treatment in a tube furnace to obtain ultrafine powdered MG. The second step was then followed by successive oxidation and ultrasonication of the already obtained MG to obtain graphene oxide (GO). Finally, ascorbic acid (VC) was selected to treat GO to prepare an aqueous suspension of reduced graphene oxide (rGO). MG (2θ = 26.2°), GO (2θ = 12.4°) and rGO (2θ = 25.5°) were obtained by XRD analysis. C 1s and O 1S were analyzed by XPS spectra. The functional groups −OH, C=O, and −C=C–, which are unique to graphene and its derivatives, were comparatively analyzed using infrared spectroscopy. The change of π→π* was analyzed by the UV–vis method. The absorbance was further found in combination with PL spectra. Immediately after, the morphology of graphite and its derivatives was analyzed by SEM, HRTEM, the physical properties by contact angle and BET, and finally the content of elements C and O by EDS. The successful demonstration of the superiority of the synthesized MG and its derivatives was achieved.
研究领域:
材料科学
·
能源科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Bing Zhang,Hongyun Meng,Xue Wang,Honghong Chang,Wenlong Wei
Mercuric ion (Hg 2+ ) as one kind of environmental pollutants has attracted more and more attentions due to its persistence, mobility and biological enrichment. In this study, a novel photoelectrochemical biosensor for Hg 2+ detection was constructed based on dye sensitization effect induced by Y-shaped DNA transformation as signal amplification strategy. Firstly, graphene oxide-ZnO-CdS nanohybrid (GO-ZnO-CdS) as photoelectric material was synthesized by simple hydrothermal method, and was employed to modify ITO electrode. Secondly, Y-shape DNA was labeled by Au NPs in the solution, and which crosslinked on the surface of GO-ZnO-CdS modified ITO electrode by carbodiimide coupling method, which resulted in the excitation energy transfer (EET) effect between Au NPs and CdS. Finally, in the presence of Hg 2+ , the structure of DNA on the modified electrode changed from Y-shape into hairpin accompanying the proximity of dye molecule based on T-Hg 2+ -T, which eliminated EET effect and triggered dye sensitization effect for enhancing photocurrent response. Under optimal conditions, the photocurrent linearly increased with the increasing of Hg 2+ levels in the range of 5 pM − 500 pM with the detection limit of 1:5 pM(LOD = 3σ blank / s ). More importantly, the developed biosensor showed the advantages of acceptable selectivity, repeatability and stability.
研究领域:
环境科学
·
生物传感
·
材料科学
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DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Tingting Jia,Pengcheng Xiao,Yi Gong,Xinde Wang,Rui Li,Yujie Long,Hongyang Zhao,Quansheng Guo,Zhenxiang Cheng
Ultralow-power logic devices are the future of electronics, achieving maximum power efficiency with minimal input power consumption. One of the biggest challenges in electronics today is tackling the issues of short-channel effects and high operating voltages, which are resolved by integrating ferroelectric negative capacitors into a conventional gate stack of two-dimensional field-effect transistors. As an excellent noncentral symmetric adjacent phase crystalline ferroelectric material, Y: Hf0.5Zr0.5O2 (Y-HZO) is compatible with complementary metal oxide semiconductor technology. It is the most promising candidate for ferroelectric negative capacitance. This study marks the first successful growth of high-quality Y-HZO on a large silicon substrate using the sol–gel method. Ferroelectric field-effect transistors (FeFET) were fabricated with stacked ferroelectric Y-HZO and integrated into a molybdenum disulfide channel to achieve steep switching and low power consumption. The FeFET demonstrated a threshold voltage of 8.8 V, a subthreshold swing (SS) of 24.95 mV/dec, and a hysteresis window of 2 V.
研究领域:
材料科学
·
半导体器件
·
纳米电子学
·
铁电材料
·
低功耗电子学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Meixia Wu,Yifeng Han,Xiang Zhou,Xihui Liang,Shuang Zhao,Man-Rong Li
Controlling and modulating the magnitude and signs of electric polarization in multiferroics are very important for practical applications. The magnetoelectric effect in multiferroic materials enables the control and tailor of electric polarization by a magnetic field or vice versa . However, there are rare investigations about the mutual control of the magnitude and signs of electric polarization in multiferroics . Here, we successfully synthesized single crystals of Y-type hexaferrites Ba 0.8 Sr 1.2 Co 2 Fe 12- x Al x O 22 ( x = 0 and 1.08) via flux method. The magnetization, magnetodielectric and magnetoelectric properties were investigated. We found that Al-doping increased the conical magnetic structure transition temperatures and enhanced the magnetoelectric properties. Most importantly, both samples exhibited reversal and non-reversal polarizations at low and high temperatures, respectively. In addition, Al-doping can stabilize the non-reversal ferroelectric polarization, possibly originating from the different field-dependent magnetic structure transitions.
研究领域:
材料科学
·
物理学
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Guangda Guo,Xiao Cheng,Fang Ye,Laifei Cheng
Reactive melt infiltration enables the incorporation of rare-earth elements into SiC/SiC composites to form protective silicate layers under water–oxygen environments, but thermal expansion mismatch may degrade mechanical properties. To address this issue, a gradient design is proposed, enriching Y near the surface while maintaining a SiC-dominated interior. By exploiting the structural tunability of polymer precursors, Y is introduced prior to Si infiltration, ensuring controllable content and spatial distribution. Porous Y-C with either uniform or gradient Y distributions are fabricated via a soft-template method combined with hierarchical impregnation. After corrosion at 1300–1400 °C, SiC ceramics with uniformly distributed Y (1.26 wt.%) forms dendritic Y 2 Si 2 O 7 , providing moderate protection, whereas gradient Y (2.21 wt.%) rapidly develops a dense and continuous surface silicate layer. This layer effectively suppresses SiO 2 volatilization and enhances corrosion resistance up to 1400 °C. The improved corrosion resistance arises from spatial Y regulation, enabling synergistic “rapid reaction–layer formation–long-term protection.”
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