JOURNAL OF ELECTRONIC MATERIALS
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2025
·Vol. 54
·期 10
·8561-8569
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IF 2.5
Dong Tianhao,Cui Yongpeng,Wei Lianghuan,Zhu Shengjie,Si Jianxiao
CaM(M = Cu, Ag)Sb Zintl-phase compounds have ignited tremendous research activities due to their promising thermoelectric properties. In this work, a series of CaCu 1− x Ag x Sb (x = 0, 0.2, 0.4, 0.6, 0.7, 0.8, 0.9, 1) samples have been synthesized and investigated. The continuous structure transition from the hexagonal CaCuSb to the orthorhombic CaAgSb is characterized as the composition regulation on Cu/Ag ratios. Lattice bonding hardens and the electrical band structure changes as a result of this transition. The lattice thermal conductivity of CaCu 0.2 Ag 0.8 Sb, which benefitted from the structure transition, showed a minimum value of 1.05 W m −1 K −1 at 323 K. At the same time, the Seebeck coefficient was improved as a result of the rise in effective mass. The findings show that the CaMSb compounds have flexible structural tunability for thermoelectric applications if the hole concentration can be further optimized. Graphical
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Materials Today Communications
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2025
·
IF 4.5
Kailiang Fang,Hongtao Wang,Zhuoming Xia,Chenyang Xiao,Erzhuo Jiang,Bo Duan,Guodong Li,Xuqiu Yang,Pengcheng Zhai
State-of-the-art thermoelectric devices require materials that combine excellent mechanical and thermoelectric properties, and the reinforcement by dispersion of nanoprecipitates is regarded as a promising solution. However, the process of introducing nanoprecipitates into materials usually involves complicated procedures. This paper presents a comparative analysis of high-pressure (HP), Spark Plasma Sintering (SPS), and melting (M) methods for preparing Ag 2 Te bulk samples. In particular, the HP method can introduce abundant nanoprecipitates at the grain boundary of Ag 2 Te bulk samples. The dispersion of nanoprecipitates significantly enhances the mechanical properties of the material, achieving an ultimate strength of 140 MPa and a fracture strain of 7.6 % through the mechanisms of crack deflection and particle pull-out. The strength and toughness of the sample improved by 57 % and 31 %, respectively, when compared to those prepared using the M method. When compared to the sample prepared using the SPS method, the improvements in strength and toughness are 13 % and 111 %, respectively. The energy filtering effect of the nanoprecipitates also improved the effective mass and Seebeck coefficient of the sample. In addition, the sample prepared by HP method exhibits higher carrier concentration due to minor Ag loss in the lattice at low temperature and without any applied current. Ultimately, in the temperature range of 300–405 K, the Ag 2 Te-HP sample has an average ZT value of 0.53, which is 110 % higher than that of Ag 2 Te-SPS sample and 200 % higher than that of the Ag 2 Te-M sample.
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Nature Communications
·
2025
·Vol. 16
·期 1
·7484
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IF 15.7
Xie Liangjun,Tong Haoyang,Peng Guyang,Wu Hao,Shi Wenjing,Yu Kuai,Hu Jinsuo,Jiao Lei,Dong Xingyan,Guo Fengkai,Cai Wei,Zhang Yang,Wu Haijun,Liu Zihang,Sui Jiehe
Carrier mobility has conventionally been manipulated to enhance thermoelectric performance by reducing crystal defects. Therefore, an effective strategy for optimizing carrier mobility is highly desired for nanostructured materials. In this work, InSb nanoprecipitates are formed in situ within the nanostructured MgAgSb matrix, serving as channels for accelerating charge carriers. A high carrier mobility of 93.1 cm 2 V -1 s -1 is achieved in MgAg 0.97 Sb 0.99 -0.02InSb composite at 300 K, resulting in an average power factor of 23.8 μW cm -1 K -2 from 300 K to 553 K. To address the efficiency degradation caused by the narrow operational temperature range of MgAgSb, a two-pair segmented thermoelectric module is developed. A high conversion efficiency of 12.4% is achieved under a cold-side temperature of ~293 K and a temperature difference of ~540 K, presenting an effective strategy for carrier mobility optimization and opening new avenues for medium-temperature waste heat harvesting using MgAgSb.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117772
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IF 6.2
Jingdan Lei,Chunhui Wang,Xiaoyun Yang,Xiwei Zhang,Di Yuan,Xu-Jin Ge,Shike Zhang,Gui Yang,Chao Wang
AgCuTe has attracted significant interest due to their superior electrical and thermal transport characteristics. In this work, we focuses on investigating the effects of Se and S solid solution on AgCuTe thermoelectric properties. A series of AgCu(Te, Se, S) solid solutions were synthesized via melting reaction. We found these compositions effectively inhibited the typical hexagonal-to-cubic phase transition and showed features of secondary phase segregation, such as Ag 2 Te, Cu 2 Te, and Cu 2 S. These nano- to microscale chemistry fluctuations significantly affect the thermoelectric transport properties, particularly thermal transport, resulting in an exceptional low lattice thermal conductivity of 0.19 W m −1 K −1 , which was approaching the amorphous limits. Consequently, a maximum figure of merit zT up to 1.4 was obtained at 723 K for AgCuTe 0.65 Se 0.1 S 0.25 sample. This work investigates the relationships between composition, structure, and thermoelectric properties of AgCuTe, providing substantial support for the further development of high-performance AgCuTe-based materials.
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Plant Nano Biology
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2025
·
IF 7.7
Daoguo Chen,Xiaohan Guo,Nan Lu,Jiaojiao Zhang,Wenjun Ma,Junhui Wang
Silver nanoparticles (AgNPs) are known for their broad-spectrum antimicrobial activity and offer distinct advantages as antimicrobial agents, including high efficacy and low tendency for resistance development. However, the mechanisms by which AgNPs inhibit plant fungal pathogens remain unclear, particularly in anthracnose caused by Colletotrichum gloeosporioides . Therefore, it is essential to elucidate the antifungal mechanisms of AgNPs against this pathogen. In this study, we demonstrated that AgNPs effectively inhibit mycelial growth and spore germination of C. gloeosporioides at concentrations of 5 mg L −1 and 20 mg L −1 . Mechanistic investigations revealed that AgNPs suppress the expression of genes related to reactive oxygen species (ROS) scavenging and cell wall integrity, rather than causing disruption of cell membrane integrity. Furthermore, AgNPs treatment significantly reduced anthracnose disease severity in Catalpa bungei leaves. Additional results indicated that AgNPs may enhance ROS burst in C. bungei by up-regulating the expression of RBOH genes, which in turn promote the expression of pathogenesis-related (PR) protein genes. Collectively, these findings clarify the potential mechanisms of AgNPs antifungal activity and provide a theoretical basis for their practical application in the management of anthracnose, as well as for resistance breeding in forestry timber species.
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Advanced Electronic Materials
·
2025
·Vol. 11
·期 15
·e00192
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IF 5.3
Yikang Li,Dazhi Wang,Yiwen Feng,Chang Liu,Xu Chen,Zefei Li,Xiangji Chen,Ran Zhang,Xiaopeng Zhang,Shiwen Liang,Liujia Suo,Weiwei Li,Guo Liu,Jifei Liu,Tiesheng Wang
Directional acoustic sensing can be used for localization and detection, has a wide range of applications in various fields, including rescue robotics, drone positioning, and underwater navigation. It is, however, a challenge to sense both the amplitude and direction of the acoustic waves with a simple sensor design. In this paper, a series of artificial cilia is prepared using additive micro-manufacturing technologies for direction-sensitive acoustic sensing, including electrospray and 3D micro-direct ink writing. The response of the artificial cilia at resonance is significantly enhanced, while the resonance frequencies decrease with increasing length, and the response increases due to the amplification. Two resonances are achieved on a cilium by printing two independent electrode-to-electrode interconnect bridges. Two signal channels of the artificial cilia produce an ‘8’-shaped loop by varying acoustic excitation angles, showing that both amplitude ratio and phase difference are direction-dependent. The two voltages of the artificial cilia can be decoupled to produce different frequencies, amplitudes, and phase differences, thus enabling directional detection of multiple sound sources. The direction-sensitive acoustic sensing is achieved by micro-manufacturing artificial cilia. This effort opens an avenue in the fields of cochlear and device detection with promising applications.
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Frontiers in Microbiology
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2025
·
IF 4.5
Rongkai Li,Qinbing Qi,Xiaojing Jiang,Zhongfei Gao,Xianrui Xie,Yuqing Zhao,Xiaochen Cheng,Chunhua Wang,Guige Hou,Chengbo Li
Infectious scald is recognized as a life-threatening concern in clinical due to easy infection and hard recovery. Exosomes possess cell migration, proliferation and angiogenesis under the containing rich growths factors, which may be a possibility for the treatment of scald chronic wounds. However, the instability and release issues of exosomes limits the storage and therapeutic efficacy. Herein, in this study, exosomes were successfully encapsulated calcium alginate microspheres, effectively avoiding the leakage and inactivation of exosomes. Meanwhile, composite hydrogel (HS-QAF-AgNPs) was fabricated with and quaternized carboxymethyl chitosan (Q-CMC), aldehyde group-modified alginate (ASA) with assisted crosslinking of ferric ion and dopped nano silver (AgNPs). The incorporation of exo-CAMs into the hydrogel protects the exosomes from harsh environmental conditions and extends their diffusion time, thereby guaranteeing a better therapeutic effect. Q-CMC and AgNPs altogether endow the hydrogel system with an inherent antibacterial effect against pathogenic microorganisms. In vitro and in vivo investigations demonstrated that the HS-QAF-AgNPs hydrogel was cytocompatibility, possessed antibacterial and hemostatic properties, promoted cell migration and cell proliferation, stimulated angiogenesis, regulated inflammatory response, delayed apoptosis, enhanced collagen deposition and accelerated wound closure. Thus, the multifunctional HS-QAF-AgNPs hydrogel dressing is expected to be a promising candidate for the treatment of severe scalds. There is an urgent need to develop multifunctional wound dressings that can coordinate cell migration, proliferation, apoptosis, collagen formation and remodeling, alongside inflammation and angiogenesis to promote skin wound closure.
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Crystals
·
2025
·Vol. 15
·期 7
·622
·
IF 2.4
Haoyu Zhao,Junliang Zhu,Zhonghe Zhu,Lin Bo,Wenying Wang,Xingshuo Liu,Changcun Li,Degang Zhao
Cubic phase SnSe-based materials have great potential in the field of thermoelectricity due to their reduced carrier scattering, increased band degeneracy, and ultra-low lattice thermal conductivity. Nevertheless, systematic studies on the influence of element doping on the thermoelectric properties of cubic SnSe-based materials are still relatively scarce. To enrich the research in this field, this work investigates the effects of Ge doping on the phase composition, electrical and thermal transport properties of cubic Sn0.50Ag0.25Bi0.25Se0.50Te0.50thermoelectric materials. X-ray diffraction (XRD) analysis confirmed that the Ge-doped samples exhibited a single cubic phase structure, while scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) revealed a uniform distribution of elements within the samples. The results indicate that increasing the Ge doping content substantially enhances their electrical conductivity, albeit at the expense of elevated thermal conductivity. By optimizing the content of Ge-doping, the thermoelectric figure of merit (ZT) reached 0.74 at 750 K. Notably, while moderate Ge doping enhances electrical transport properties, excessive doping leads to a significant rise in thermal conductivity, ultimately constraining further thermoelectric performance gains.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·Vol. 27
·期 37
·19939-19949
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IF 2.9
Zhangheng Lai,Xiangbin Chen,Qixian Zheng,Zhengmao Luo,Zhongshuo Li,Ning Qi,Zhiquan Chen
Polycrystalline SnSe has been widely explored due to its relatively low thermal conductivity. Yet its thermoelectric performance is limited due to its poor electrical conductivity. In this work, polycrystalline SnSe alloyed with different contents of CuAgSe were fabricated by a high-energy balling and melting method, combined with spark plasma sintering. It is revealed that substitution of Ag and Cu at Sn sites actually enhances the electrical conductivity, especially under Sn-deficient circumstances where the formation energy of AgSn is lowered. When there was excessive addition of CuAgSe, the hole carrier concentration was reduced due to the formation of Agi, which acts as an electron donor. Additionally, partial substitution of Ag and Cu into the Sn vacancies slightly improves the Hall mobility and the density of states effective mass. With increased electrical conductivity while maintaining a stable Seebeck coefficient, the Sn0.99Se sample alloyed with 0.75% CuAgSe attains a maximum power factor of 6.40 μW cm−1 K−2 at 847 K. In addition, a peak zT value of 0.97 at 847 K is achieved, combined with only a marginally decreased thermal conductivity, thereby exhibiting a prominent improvement over that of the pure SnSe sample. The present work opens up a new perspective for optimizing the thermoelectric performance of SnSe compounds with the strategy of tuning the content of Sn and alloying with CuAgSe.
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International Journal of Smart and Nano Materials
·
2025
·
IF 6.6
Jiefeng Gong,Zhiyuan Huang,Huihuang Yu,Hongmingzhe He,Yige Xiong,Longqiu Li,Guanhua Zhang,Guangyu Zhang
High-precision three-dimensional (3D) printing has enabled the fabrication of architected microlattices with complex geometries and tunable functionalities, offering new opportunities for electrochemical energy storage devices. In particular, 3D polymer octet-truss lattice frameworks exhibit exceptional mechanical robustness, structural regularity, and customizable porosity, making them promising candidates for electrode applications. However, current fabrication techniques often face challenges in achieving the required precision and structural integrity for advanced applications. In this study, projection micro stereolithography (PμSL) was utilized to fabricate high-resolution 3D electrode substrates based on octet-truss microlattices. The printed structures were systematically optimized for both mechanical stability and printing accuracy. Electrochemical plating and magnetron sputtering were employed as surface modification techniques to improve the physicochemical characteristics of the lattices and introduce lithium-affinitive functionality. The resulting 3D microlattice electrodes demonstrate high structural precision and enhanced electrochemical performance, highlighting their strong potential for integration into advanced lithium metal batteries and related energy storage systems.
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PEST MANAGEMENT SCIENCE
·
2025
·
IF 3.8
Liwang Fei,Jianbing Liang,Shiquan Fu,Ying Xu,Lingyun Hao
BACKGROUND Rice blast, caused by Pyricularia oryzae , poses a formidable threat to global rice production. Given that chemical fungicides, one of the important methods used to control rice blast, cause harm to the environment and human health, sustainable alternatives are required. This study aimed to synthesize silver nanoparticles (AgNPs) with antifungal activities against P. oryzae using mangrove soil bacteria, and to evaluate their ecotoxicity. RESULTS In this study, AgNPs were synthesized using fermentation extracts from Pseudomonas aeruginosa R64. The resulting nanoparticles (RFE-AgNPs), ranging in size from 4.516 to 37.031 nm, were characterized by UV–visible spectroscopy and high-resolution transmission electron microscopy equipped with energy dispersive spectroscopy. RFE-AgNPs at 20 μg mL −1 had strong antifungal activity against P. oryzae , inhibiting colony growth by 77%. Moreover, RFE-AgNPs significantly hindered conidial germination, germ tube elongation and appressorium formation. In addition, microscopic observation revealed that RFE-AgNPs treatment disrupted mycelial morphology, lipid and glycogen metabolism and the cAMP signaling pathway of P. oryzae , limiting its infection and expansion in host tissues. A pathogenicity test confirmed that RFE-AgNPs significantly reduced disease development in barley and rice leaves. Importantly, RFE-AgNPs displayed significantly lower toxicity to Artemia salina compared with isoprothiolane and commercial AgNPs. CONCLUSION RFE-AgNPs synthesized using mangrove soil bacterial natural products displayed good control efficacy on rice blast but low ecotoxicity on A. salina and had great potential to be a promising candidate for eco-friendly biopesticides to manage rice blast disease. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Asia-Pacific Journal of Chemical Engineering
·
2024
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IF 1.4
Jiajia Zhang,Xueni Sun,Hui Shao
The lowered dispersibility of carboxylic acid polymers in the seawater system with high salt content results in reduced scale inhibition efficiency. To solve this problem, a series of carboxylic acid polymers containing ether groups were prepared by free radical polymerization using α-allyl glycerol ether (AG) and vinyl monomers containing different numbers of carboxylic acid groups (acrylic acid [AA], maleic acid [MA], itaconic acid [IA], and aconitic acid [ANA]) as raw materials, and their scale inhibition properties in artificial seawater were studied. The static test results demonstrate that IA-AG outperforms the other three polymers containing ether carboxylic acid in terms of scale inhibition performance, with CaCO 3 and CaSO 4 having scale inhibition rates of 95.16% and 98.73%, respectively. Furthermore, molecular dynamics (MD) simulation was employed to investigate the mechanism of scale inhibition by simulating the interaction between ether carboxylic acid polymers and the crystal surface. The results show that the order of binding energy between polymers and crystal faces is IA-AG > ANA-AG > MA-AG > AA-AG. The simulation results are in agreement with the experimental phenomena. The polymers can overcome their own deformation and adsorb on the crystal surfaces, thus inhibiting the growth of scale.
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