CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qin Zhang,Jiaqi Yang,Bo An,Ke Wang,Dongxing Song,Huijuan Su
Gd 0.1 Ce 0.9-x Ga x O 2-δ (x = 0, 0.04,0.07, 0.12) are synthesized via the citric acid-EDTA combustion method as an electrolyte material for intermediate-temperature solid oxide fuel cells. XRD and Rietveld refinement revealed that the material exhibits a single-phase cubic fluorite structure. SEM and EDS analyses demonstrated that the incorporation of Ga ions improved the sample's density, increased the grain size, and provided better element dispersion. XPS analysis confirms that Ga-Gd co-doping leads to increased oxygen vacancy concentration and modifies the oxidation states of Ce. Impedance spectroscopy results indicated that Ga-Gd co-doped ceria has higher ionic conductivity and lower activation energy compared to Gd single-doped ceria. In comparison to Gd 0.1 Ce 0.9 O 1.95 , the best-performing Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ achieved nearly a 26-fold increase in ionic conductivity and a 66 % reduction in activation energy. The clearance coefficient of Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ reached 100.95, while the blocking factor decreased by nearly 73 % compared to Gd 0.1 Ce 0.9 O 1.95 . The incorporation of Ga ions led to a nearly one order of magnitude reduction in the dissipation of oxygen vacancy concentration in the space charge layer, with the potential decreasing from 0.3971V (Gd 0.1 Ce 0.9 O 1.95 ) to 0.3117V (Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ ). Dielectric studies clarified the contribution of the Gd-Ga synergistic effect on interfacial polarization. In terms of single-cell performance, the NiO-GDC| Gd 0.1 Ce 0.83 Ga 0.07 O 2-δ |LSCF cell exhibited higher power density and current density, particularly showing a 42.9 % performance improvement at 650 °C compared to NiO-GDC|Gd 0.1 Ce 0.9 O 1.95 |LSCF. Density functional theory calculations indicated that the incorporation of Ga ions effectively suppresses the electronic conductivity of CeO 2 and significantly reduces the formation energy, binding energy, and migration barrier of oxygen vacancies. Therefore, Ga-Gd co-doping can be regarded as an effective strategy for enhancing the performance of ceria-based electrolytes in IT-SOFCs.
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Materials
·
2024
·Vol. 17
·期 6
·1258
·
IF 3.1
Min Liu,Yansen Zhang,Song Hu,Guohong Zhou,Xianpeng Qin,Shiwei Wang
Ce-doped gadolinium gallium aluminum oxide (Ce: GGAG) precursors were first prepared by the microwave-assisted homogeneous precipitation method (MAHP). Thermal gravity-differential thermal analysis (TG-DTA), X-ray diffraction (XRD), specific surface area analysis (BET) and field emission scanning electron microscopy (FE-SEM) were employed to investigate the crystal structure, phase evolution and morphologies of the Ce: GGAG precursors and powders. The influence of Ga ion concentration in the salt solution on the properties of Ce: GGAG powders was investigated. All the precursors were transformed into single-phase GGAG after being calcined at 950 °C in a furnace for 3 h. Monodispersed Ce: GGAG powders were obtained as the Ga ion concentration was lower than 0.06 mol/L. Single-phase and dense Ce: GGAG ceramics were obtained after sintering at 1600 °C in a flowing oxygen atmosphere for 10 h. Specifically, the Ce: GGAG ceramic reached its maximum density of ~6.68 g/cm3, which was close to its theoretical density of 6.70 g/cm3, and exhibited the highest optical transmittance of 65.2% at 800 nm after hot isostatic pressing sintering (HIP) as the Ga ion concentration was 0.02 mol/L. The decay time and light yield of the GGAG ceramic were 35 ns and 35,000 ± 1250 ph/MeV, respectively, suggesting that Ce: GGAG ceramics prepared using MAHP-synthesized nanopowders are promising for scintillation applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xinru Zhang,Yijie Wang,Lei Zhang,Xiaohai Zhang,Bao Hao,Xiaorui Liang,Helei Dong,Yongqiang Qin,Qiulin Tan
The real-time and accurate detection of ammonia is critical for food freshness testing, agricultural monitoring, and respiratory health diagnostics. Recently, flexible gas sensors have garnered attention owing to their potential for integration into smart wearable electronics and display devices. However, the development of high-performance, low-power, and stable devices remains challenging. In this study, a chemoresistive sensor based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/MXene composites is designed, wherein the application of a genetic algorithm-optimized back propagation neural network to compensate for humidity leads to a significantly enhanced detection accuracy. Notably, the use of a genetic algorithm-optimized back propagation neural network reduces the detection error from 8.06 % to 1.3 % in the presence of 50 ppm NH 3 . A wireless Bluetooth monitoring system is integrated to enable real-time data transmission and remote monitoring. This sensor detects ammonia within the range of 0.6–1000 ppm, demonstrating an excellent stability, selectivity, and flexibility, thereby confirming the synergistic effects between PEDOT:PSS and MXene. Importantly, in application tests, the developed system reliably assesses meat spoilage and farm ventilation levels, indicating its high applicability and reliability. Successful human breath tests also open new possibilities for the application of this sensor in respiratory health monitoring. Ultimately, this study offers a convenient and efficient approach for food quality assurance, disease diagnosis, and environmental monitoring.
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ADVANCED ENGINEERING MATERIALS
·
2024
·
IF 3.4
Zihao Song,Longjin Huang,Sheng Cui
In this work, a novel strategy for preparing Ga-doped TiO 2 composite aerogel antibacterial agent through the sol–gel method and supercritical technology is demonstrated. The specific surface area of the samples is as high as 175 m 2 g −1 and exhibits a 3D network structure with a multistage pore distribution. The obtained antibacterial agent combines the phototoxicity of TiO 2 , photo-independent toxicity of Ga 3+ , and structural properties of aerogels, showing a synergistic antibacterial effect. On the one hand, TiO 2 produces reactive oxygen species in the presence of light, thus destroying the structure of bacteria. On the other hand, Ga 3+ competitively replaces Fe 3+ and hinders the metabolic process of bacteria. Moreover, the structural properties of aerogels promote superior antimicrobial performance of antibacterial agents. Their antibacterial properties against Escherichia coli and Staphylococcus aureus bacteria are mainly investigated through the inhibition zone and natural colony counting method. In the results, it is shown that the structure and bactericidal activity of TiO 2 aerogel is effectively optimized with Ga 3+ doping. The maximum zone of inhibition of the composite aerogel against E. coli and S. aureus is 17.5 and 16 mm, and the bactericidal rate is as high as 98.57% and 96.60%, which exhibit outstanding bactericidal performance.
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PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2023
·
IF 6.5
Yunshuai Huang,Jiawei Song,Qixian Hao,Changling Mou,Hongming Wu,Fulin Zhang,Ziyan Zhu,Ping Wang,Tengfei Ma,Kai Fu,Yaping Chen,Thanhliem Nguyen,Shijia Liu,Ling Jiang,Jianmin Wan
Seed dormancy is a critical trait that enhances plant survival by preventing seed germination at the wrong time or under unsuitable conditions. Lack of seed dormancy in rice can lead to pre-harvest sprouting on mother plants leading to reduced yield and seed quality. Although some genes have been identified, knowledge of regulation of seed dormancy is limited. Here, we characterized a weak seed dormancy mutant named weak seed dormancy 1 ( wsd1 ) that showed a higher seed germination percentage than the wild-type following the harvest ripeness. We cloned the WSD1 encoding an aminotransferase protein using a MutMap approach. WSD1 was stably expressed after imbibition and its protein was localized in the endoplasm reticulum. A widely targeted metabolomics assay and amino acid analysis showed that WSD1 had a role in regulating homeostasis of amino acids. PAC treatment and RNA-seq analysis showed that WSD1 regulates seed dormancy by involvement in the GA biosynthesis pathway. GA 1 content and expression of GA biosynthesis-related genes were increased in the wsd1 mutant compared with the wild-type. The wsd1 mutant had reduced sensitivity to ABA. Our overall results indicated that WSD1 regulates seed dormancy by balancing the ABA and GA pathways.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Qi Zou,Qichi Le,Xingrui Chen,Yonghui Jia,Chunyan Ban,Tong Wang,Henan Wang,Ruizhen Guo,Liang Ren,Andrej Atrens
This paper investigates the microstructure, corrosion, electrochemical behavior, and the discharge performance of Gallium (Ga) alloyed Mg-Al-Zn alloys using the gravimetric method, electrochemical measurements, and battery test. The average grain size of AZ80–2.5Ga (Mg-8Al-0.5Zn-2.5Ga alloy) is 36% smaller than that of AZ80 (Mg-8Al-0.5 Zn alloy). The number and size of the Mg 17 Al 12 phase particles are smaller and more homogeneously distributed. Ga reduces the self-corrosion rate, increases the electrochemical activity and the discharge performance. The grain refinement generates many grain boundaries on the surface and promotes discharge performance. The decrease of the self-corrosion rate is attributed to the suppression of the protective film that inhibits the anode consumption. The AZ80–2.5Ga anode has the optimal discharge capacity of 1437 mAh g − 1 and anode efficiency of 61% at 50 mA cm −2 , which are 25% and 29% higher than for the AZ80 anode.
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高影响因子
Small
·
2025
·
IF 12.1
Yanlin Zhang,Changming Zhang,Zheng Zhang,Huakang Zong,Pengwei Tan,Liyang Luo,Yuanyuan Luo,Guotao Duan
In the sensing field, the electronic structure of sensing materials has a great influence on the properties of the sensors. Here, by Ga doping pure rhombohedral In 2 O 3 (h-In 2 O 3 ), the double-phase In 2 O 3 (cubic/rhombohedral In 2 O 3 , c/h-In 2 O 3 ) porous nanospheres are obtained. And then Micro Electromechanical System (MEMS) gas sensors based on monolayer film are further fabricated by self-assembling the above nanospheres. The 5% Ga-doped In 2 O 3 sensors exhibit excellent HCHO sensing performance with a high-response (110.6@100 ppm), rapid response/recovery time (5.2/18.4 s) and low limit of detection (50 ppb) at an operating temperature of 180 °C. The 5% Ga-doped In 2 O 3 sensors also show high consistency (fluctuations of only 8.3%). Besides, a handheld device is developed to enable real-time monitoring and early warning of indoor HCHO at ppb-level. Based on experimental results and DFT theoretical calculation, the enhanced sensing mechanism is revealed, which is correlated with the optimization of electronic band structure by Ga doping and the appearance of double-phase heterostructures caused by Ga doping. Therefore, the relationship between electronic structure and gas sensing properties has also been established. This work significantly introduces a novel approach for the mass production of MEMS gas sensors, ensuring high sensitivity, repeatability and consistency.
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高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Ningxia Li,Qi Luo,Meiyan Cui,Zhiying Zhao,Zhangzhen He
New fluorophosphate compounds H A 5 M 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb; M = Fe, Ga) were synthesized by a fluorine-rich hydrothermal method . These compounds crystallize in the monoclinic system with a P2 1 /n space group, exhibiting an open framework structure built by [PO 3 (OH)] groups, [MO 4 (OH)F], and [MO 4 F 2 ] octahedra, where ten-membered-ring channels, eight-membered-ring channels, six-membered-ring channels, and the linear M 3+ trimers are seen. The characterizations were carried out by powder XRD , EDS , FT-IR spectra, and magnetic measurements. The results confirmed that H A 5 Fe 6 (OH) 4 F 4 (HPO 4 ) 8 ( A = K, Rb) show a quite similar magnetic behavior, possessing an antiferromagnetic ordering at 14.7 K and 15.6 K, respectively. The changes of the magnetic entropy for such antiferromagnetic orderings can be estimated as ∼10.7 J mol −1 K −1 and ∼13.4 J mol −1 K −1 .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Haotian Xie,Ying Tang,Yang Yang,Ning Zhang,Xiaolong Gu,Huaicheng Xiang
In microwave dielectric materials , the phenomenon that the measured permittivity ( ε r ) is inconsistent with the calculated permittivity ( ε r (C-M) ) often occurs. In the present work, the intrinsic factors affecting the microwave dielectric properties of Ga-based garnet Ca 3 B 1.5 Ga 3.5 O 12 (B = Nb, Ta) are studied by bond valence and the Phillips-Van Vechten-Levine (P-V-L) methods, and the relationship between lattice-induced strain effect and dielectric polarization is elucidated. Since the ionic polarizability of Nb 5+ is lower than that of Ta 5+ , the ε r (C-M) values of Ca 3 Nb 1.5 Ga 3.5 O 12 (CNG) and Ca 3 Ta 1.5 Ga 3.5 O 12 (CTG) are 11.06 and 12.17, respectively. However, this is the opposite trend of the measured values (15.00 and 12.62). The global instability index ( GII ) is equal to 0.013 and 0.044 v.u. , respectively. Both the indexes, bond strain index ( BSI ) and GII , are related to the entire crystal structure. A stronger lattice-induced compressive strain and a higher degree of covalency lead to a lower measured ε r , a higher Q×f , a higher temperature coefficient of permittivity τ ε , and a larger negative τ f .
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Lin Xiang,Xianju Zhou,Li Li,Faling Ling,Yanhong Li,Jingfang Li,Hongmei Yang
Eu 3+ ions are extensively employed as spectroscopic probes because of the particular emissions due to the unique 4f 6 electronic configuration. Herein, we have developed a series of interesting fluorescent powders of Eu 3+ activated Sr 2 MNbO 6 (M = Ga, In, Gd). When Sr 2 GaNbO 6 :Eu 3+ is excited by the photons in the range of charge transfer band (CTB), the dark red 5 D 0 → 7 F 4 transition predominates the emission, exhibiting an anomalous intensity even higher than that of 5 D 0 → 7 F 1 or 5 D 0 → 7 F 2 . Whilst, if the sample is pumped by f-f characteristic transitions, the hypersensitive 5 D 0 → 7 F 2 transition emerges as the strongest. However, Eu 3+ doped Sr 2 InNbO 6 and Sr 2 GdNbO 6 never demonstrate such results, 5 D 0 → 7 F 1 acts as the most intense one regardless of the excitation wavelength. It is found that Eu 3+ substitutes Sr 2+ site, and cuboctaherdron [SrO 12 ] with O h symmetry is likely to deform to triangular orthobicupola D 3h symmetry, leading to two non-equivalent crystal sites in Sr 2 GaNbO 6 host. But Eu 3+ replaces In 3+ and Gd 3+ position with O h symmetry and has only one site in Sr 2 InNbO 6 and Sr 2 GdNbO 6 . Based on the comparative study on the intensity of 5 D 0 → 7 F 0 transition, as well as the influence factors of temperature, the doping concentration on the relative intensity among 5 D 0 → 7 F J transitions, and the band gaps of these three hosts, the origin of the abnormal intense 5 D 0 → 7 F 4 is ascribed to the mixing of CTB and low-lying 4f 6 configuration as well as two non-equivalent Eu 3+ sites.
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高影响因子
Journal of Materiomics
·
2025
·
IF 9.6
Kui Xue,Min Xing,Tiantian Chen,Bingyun Xi,Haifeng Zhang,Kuicai Ye,Jiayin Feng,Wenhao Qian,Jiajun Qiu,Xuanyong Liu
For alveolar bone defects, magnesium membrane with the mechanical properties of shielding fibrocyte growth and sustainable release of Mg 2+ is an excellent choice for guide bone regeneration (GBR) surgery. However, insufficient osteogenesis and bacterial infection have hindered its application. In this study, Mg-Ga-LDH coating was successfully prepared, which delayed the degradation rate of the Mg membranes and greatly reduced the amount of hydrogen evolution. A weakly alkaline microenvironment (pH =8.5) containing appropriate concentrations of Mg 2+ and Ga 3+ was successfully constructed, effectively promoting the adhesion and proliferation of MC3T3-E1 cells. It also upregulated the expression of alkaline phosphatase and collagen, which were conducive to the formation of mineralized nodules, and promoted the osteogenic differentiation of rat bone marrow mesenchymal stem cells in vitro . In addition, Ga 3+ released from the coating and the generated alkaline microenvironment showed good antibacterial properties against S. aureus . The Mg-Ga-LDH coating can effectively reduce the degradation rate of Mg membranes and mitigate inflammation. The Mg-Ga-LDH coating modified Mg membrane promoted new bone formation in cranial defect animal models. This bone-promoting Mg 2+ and Ga 3+ releasing platform and weak alkaline microenvironment creation system paves the way for the application of Mg membranes in the field of GBR.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ze-Yuan Yang,Qiu-Yu Luo,Chong-Yu Wang,Yang-Wei Wang,Jiang-Hu Yu,Xi Yan,Yi-Xin Zhang,Xing Yang,Jing Feng,Zhen-Hua Ge
Due to their high abundance, low cost, and low toxicity, Bi 2 S 3 -based thermoelectric materials without Te are significantly promising for eco-friendly and scalable applications. However, the ZT value of Bi 2 S 3 -based is not high enough and must be further improved. The rare-earth element doping is a promising strategy for synergistically enhancing the electrical and thermal transport properties. This study selected GaTe and YbBr 3 for co-doping in Bi 2 S 3 polycrystals using a solid-state reaction and spark plasma sintering, which enabled simultaneous modulation of the band structure and carrier concentration for significantly enhanced thermoelectric and mechanical properties. Specifically, the synergistic optimization of electrical and phonon transport was initially achieved through GaTe doping in Bi 2 S 3 , which effectively reduced the lattice thermal conductivity while enhancing electrical conductivity. However, the improvement in thermoelectric performance with GaTe doping alone remained limited. Br substituted S to introduce extra electrons, while Yb replaced Bi to reduce the bandgap from 1.38 to 1.05 eV. The two effects synergistically optimized the electrical transport properties of the matrix. As a result, the optimized Bi 2 S 3 + 0.5 wt% GaTe +1.0 wt% YbBr 3 sample achieved an exceptional average power factor of 475.4 μW m −1 K −2 over 323–773 K. Additionally, point defects, dislocations, and micropores induced by the second phase contributed to strong phonon scattering, leading to a low lattice thermal conductivity of 0.56 W m −1 K −1 at 773 K. Consequently, a peak ZT value of 0.67 at 773 K and a high average ZT value of 0.45 over 323–773 K were achieved, which were relatively higher than other values reported in the literature. Furthermore, the mechanical properties were improved, with hardness increasing from 2.55 to 2.93 GPa, making Bi 2 S 3 more deformation-resistant and durable. This study showed that co-doping rare earth elements was an effective approach for enhancing the thermoelectric and mechanical properties of the Bi 2 S 3 material.
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