ACS Applied Materials & Interfaces
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2026
·
IF 7.8
Yihan Wu,Shanhong Wan,Shanshan Xiao,Chenxin Wang,Shaoqing Lu,Weite Meng,Mingquan Li,Lulu Huang,Khak Ho Lim,Yu Liu
Earth-abundant tetrahedrite Cu12Sb4S13 is a promising p-type thermoelectric (TE) material owing to its intrinsically low lattice thermal conductivity, yet its performance remains limited by insufficient electrical transport and the persistent trade-off between charge and phonon transport. In this study, we present a colloidal route for the scalable synthesis of Ag-substituted Cu12Sb4S13 nanocrystals and use these nanocrystal building blocks to construct bulk tetrahedrite TE materials with improved transport balance. Ag incorporation preserves the tetrahedrite framework while inducing lattice expansion, increased microstrain, local bond softening, and enhanced structural disorder, which can be retained to a meaningful extent after densification. These structural perturbations are accompanied by a marked enhancement in electrical conductivity and weighted mobility, together with a substantial suppression of lattice thermal conductivity. The optimally substituted Cu11.92Ag0.08Sb4S13 sample exhibits the best overall transport performance, reaching a lattice thermal conductivity of 0.30 W m–1 K–1 and a maximum zTmax of 1.23 at 690 K, representing an approximately 1.8-fold improvement over pristine Cu12Sb4S13, as well as competitive theoretical conversion efficiency and slightly improved hardness. These results highlight Ag-substituted nanocrystals as effective building blocks for improving the TE performance of earth-abundant tetrahedrites through coordinated control of structure and transport.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Kai Liu,Yeming He,Jiaxin Wei,Feiyang Wen,Dongxia Zhang,Zemin He,Jianxin Guo,Zhiyuan Liang,Jianjing Gao
Controllable synthesis of rough-surfaced metal nanostructures remains a critical challenge in surface materials science, as surface roughness directly determines the plasmonic, catalytic and sensing properties of nanomaterials. Herein, we report a facile lattice mismatch-directed island growth strategy for fabricating roughened Ag-Cu heterostructured triangular nanoframes with naturally roughened surfaces, using Cu nanoplates as dual-functional sacrificial templates. The intrinsic lattice mismatch between face-centered cubic Ag and Cu drives the preferential island-like nucleation of Ag atoms on the high-energy edges of Cu nanoplates, avoiding the formation of a continuous epitaxial layer. This unique growth mode generates nanoframes with abundant surface defects and dense plasmonic hot spots, while the residual Cu induces spontaneous interfacial electron transfer to form an electron-rich Ag surface. The as-prepared nanoframes exhibit 13.5-fold higher SERS activity than smooth monometallic Ag nanoplates, and show excellent performance in both aqueous dispersion and solid substrate configurations. This work provides a general and scalable approach for regulating the surface microstructure of template-derived nanostructures through lattice mismatch engineering.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Jinping Tang,Fuqiang Qian,Yuhai Wang,Chunxu Wang,Yuan Chai,Dewen Kong,Jin Wang
By integrating the photonic nanojet effect of polystyrene microsphere (PS), the charge transfer capability of MXene nanosheets, and the electromagnetic field enhancement induced by Ag nanoparticles, the PS@MXene@Ag composite substrate exhibited outstanding SERS sensitivity. • The SERS performance of the PS@MXene@Ag substrate was evaluated using 2-mercaptopyridine as a probe molecule, achieving a detection limit as low as 1.24 × 10 −12 M, with the SERS performance factor (SPF) up to 5.0 × 10(Gueguen et al., 2000 [7] ) . In addition, the SERS substrate demonstrated satisfactory results in signal uniformity, batch-to-batch reproducibility, and long-term stability. • PS@MXene@Ag composite successfully detected thiram and methyl blue on practical sample surfaces (orange and fish), achieving satisfactory recovery rates. Surface-enhanced Raman scattering (SERS) spectroscopy has emerged as a powerful analytical technique for the sensitive detection of hazardous molecules, owing to its ultranarrow spectral linewidths and highly specific molecular fingerprinting capability. Herein, we designed a reliable SERS substrate consisting of polystyrene microspheres (PS), Ti 3 C 2 T x MXene nanosheets, and Ag nanoparticles (NPs) for the sensitive detection of various organic pollutants. By integrating the photonic nanojet effect of PS, the charge transfer capability of MXene nanosheets, and the electromagnetic field enhancement induced by Ag NPs, the PS@MXene@Ag composite substrate exhibited outstanding SERS sensitivity, along with excellent reproducibility and signal uniformity. As a result, the limit of detection (LOD) for 2-mercaptopyridine (2-Mpy) was as low as 1.24 × 10 −12 M, with the SERS performance factor (SPF) of up to 5.0 × 10 7 . Moreover, the SERS substrate maintained good stability after storage for four weeks. In addition, the PS@MXene@Ag composite was successfully applied to the detection of other organic pollutants, including thiram and methylene blue (MB). The calibration results revealed a good linear relationship between the logarithm of concentration and the corresponding SERS intensity, with correlation coefficients (R 2 ) of 0.99 and 0.98, respectively. The LODs for thiram and MB were calculated to be 1.96 × 10 −10 M and 2.33 × 10 −10 M, respectively, and satisfactory recovery rates were obtained in practical sample analyses (orange peel and fish skin). These results demonstrate that the fabricated PS@MXene@Ag SERS substrate has promising potential for the detection of organic molecular pollutants. Download: Download high-res image (129KB) Download: Download full-size image PS@MXene@Ag as a SERS-active substrate for the detection of organic pollutants.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Jie Chen,Haifei Huan,Zitong Zhu,Yufeng Qu,Yan Ji,Menghao Wu,Qiuyang Zhang,Changjiang Pan
A natural hydrogel coating confers multifunctionality to polyurethane biointerfaces. • The synergy of CMCS and AgNPs endowed robust, long-lasting antibacterial action. • NO catalytically released by Cu²⁺ enabled superior pro-endothelialization performance. Despite its favorable mechanical properties, the clinical application of polyurethane (PU) in cardiovascular implants is severely limited by surface hydrophobicity, poor hemocompatibility, and insufficient antibacterial and pro-endothelialization functions. To overcome these limitations, we report a robust natural hydrogel coating (PU-Gel/Cu/Ag) with integrated anticoagulant and antibacterial functionalities, fabricated through the initial deposition of a polydopamine (PDA) covalent anchoring layer on polyurethane, followed by the grafting of a carboxymethyl chitosan (CMCS)/sodium alginate (SA) composite co-loaded with copper ions (Cu²⁺) and silver nanoparticles (AgNPs). A substantial decrease in water contact angle was observed for the coated PU, confirming that the coating markedly improved surface hydrophilicity. In addition, a substantial reduction in hemolysis ratio and fibrinogen adsorption was achieved with the coating, along with potent inhibition of platelet adhesion and activation, which together underscore its outstanding anticoagulant properties. Moreover, cell assays confirmed that the coating not only significantly enhanced endothelial cell (EC) attachment, expansion, and VEGF/NO expression, but also dramatically suppressed smooth muscle cell (SMC) adhesion and proliferation, highlighting its excellent pro-endothelialization and anti-intimal hyperplasia performance. Owing to the intrinsic cationic antibacterial property of carboxymethyl chitosan, combined with the synergistic action of AgNPs, the as-prepared coating demonstrated potent and sustained antimicrobial action that effectively suppressed both Gram-positive S. aureus and Gram-negative E. coli. The coating-incorporated Cu²⁺ acted as a durable catalyst that continuously drove NO production from endogenous donors, thereby synergistically augmenting both anticoagulation and pro-endothelialization. This study establishes a new paradigm for the design of multicomponent synergistic coatings, in which the coexistence of Cu²⁺ and AgNPs within a natural hydrogel matrix enables the synergistic regulation of surface wettability, catalytic NO release, and multi-target antibacterial action. This integrated approach fundamentally overcomes the limitations of previously reported single- or dual-functional coatings, offering a broadly applicable and translatable strategy for surface engineering of cardiovascular implant materials. Download: Download high-res image (228KB) Download: Download full-size image
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Gels
·
2026
·Vol. 12
·期 10
·858
·
IF 6.4
Gang Wang,Yu Wang,Yi Yang,Zhihua Cheng,Rong Liu,Lina Chang,Guangyu Zhang,Jiamu Dai,Du Nie,Chuanfeng Zang
Recoverable photocatalysts with broad optical response are of interest for practical water treatment. A 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (THPP)/TiO2/Ag composite was prepared hydrothermally and immobilized on activated carbon fiber (ACF) aerogel by silane-assisted dip coating. The design combined potential THPP photosensitization and Ag-mediated interfacial effects with TiO2photocatalytic sites and an adsorptive, recoverable ACF support. Structural and spectroscopic characterization supported incorporation of the components and changes in optical response and emission behavior. Overall apparent methylene blue removal reached 88.7% under UV irradiation and 88.0% under xenon-lamp irradiation. The concentration profiles were approximately fitted using an apparent pseudo-first-order model. Increasing the number of immersion cycles did not further improve the photocatalytic performance. These results demonstrate adsorption-assisted dye removal using an immobilized multiphase composite. The proposed charge-transfer pathway is presented as a mechanistic interpretation rather than a directly established electronic configuration.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2026
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IF 7.9
Songting Jiang,Chenghao Zhang,Chun Li,Xiaoqing Si,Zongjing He,Lin Cao,Chengxian Li,Shisheng Huang,Jun Wang,Yang Liu,Jian Cao
In this work, Ti 3 AlC 2 ceramics were joined by reactive air brazing using Ag–CuO fillers. The Ag–4CuO filler showed the best wettability, with a minimum contact angle of 13.1°. Continuous and dense brazed seams were formed at 1000 °C-1100 °C. The joint interface consisted of an Ag–rich brazed seam and a TiO 2 /α-Al 2 O 3 layered reaction zone. Increasing brazing temperature, the reaction layer evolved from TiO 2 –dominated products with limited Al 2 O 3 to a TiO 2 /Al 2 O 3 /TiO 2 trilayer structure, whereas increasing CuO content thickened the oxide reaction layer. The maximum shear strength reached 72.2 MPa at 1050 °C for 30 min with 4 mol.% CuO. Fracture was dominated by brittle features, with fracture regions varying with the reaction-layer structure. These results provide experimental guidance for reactive air brazing of Ti 3 AlC 2 ceramics.
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ACS Applied Nano Materials
·
2026
·
IF 5.8
Huaqi Chai,Junsheng Wang,Yuanhai Lin,Yuncong Wang,Bingjie Chai,Mingming Xu
The fabrication of surface-enhanced Raman scattering (SERS) substrates with high hotspot density and superior sensitivity is a critical bottleneck limiting their practical applications. In this paper, a three-dimensional (3D) SERS substrate based on high-density Cu@Ag bimetallic heterostructured nanoflowers (Cu@Ag NF) was constructed using citric acid etching-assisted electrochemical deposition (ED) technology and high-vacuum electron beam evaporation coating technology, which provides an efficient and low-cost preparation process for the SERS substrate. The performance of a Cu@Ag 3D-SERS substrate was evaluated systematically using crystal violet (CV) as the probe molecule. This substrate exhibited a limit of detection (LOD) as low as 10–12 M (pM), and the signal intensities at its five characteristic peaks were more than 10 times higher than those of the Ag@ITO substrate, indicating its high sensitivity. In addition, the substrate demonstrated excellent uniformity (relative standard deviation (RSDs) < 11% for 15 randomly tested points) and long-term stability (no significant signal attenuation after 2 weeks of storage at room temperature). This work provides valuable guidance for the facile, scalable, and low-cost fabrication of high-performance SERS substrates, and presents a reliable strategy for the detection of trace organic pollutants in practical scenarios.
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Journal of Materials Chemistry C
·
2026
·
IF 5.1
Kai Tang,Zafari Umar,Lan Jiang,Lin Wang,Huan He,Xiaoqiang Zhan,Hongli Yang,Weiyou Yang,Dongdong Zhang
Detecting ethanol is critically important due to its widespread industrial applications and potential safety hazards, posing significant risks to both industrial production and human health. However, the development of ethanol sensors with high sensitivity and selectivity remains a substantial challenge. In this study, we demonstrate a highly sensitive and selective ethanol sensor based on rationally-designed heterojunctions, fabricated by decorating In2O3 nanotubes with Ag nanoparticles (NPs) through solvothermal and coprecipitation methods. The obtained Ag/In2O3 sensor exhibits exceptional ethanol sensing performance (S = 110.5 to 100 ppm), which exhibits an approximately 11-fold enhancement compared to that of pristine In2O3, and surpasses those of most ethanol sensors ever reported. Such improvement is mainly attributed to the synergistic effects of Schottky junction formation, electronic sensitization, and chemical catalysis, which collectively enhance electron transfer efficiency and surface reaction kinetics. Moreover, the as-constructed sensor demonstrates rapid response/recovery characteristics (50/70 s), excellent selectivity against interfering gases, and remarkable long-term stability, representing its promise toward practical applications.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 41
·415204
·
IF 3.874
Qi Zou,Chaofan Shi,Bo Liu,Dejun Liu,Duo Cao,Feng Liu,Yi Zhang,Wangzhou Shi
Polyacrylonitrile/Ti3C2Tx MXene/silver nanoparticles fiber membranes with different silver nanoparticles contents and thickness of porous structure have been successfully prepared by electrospinning. Through the measurement of terahertz time domain spectrum, the shielding effect of the fiber membrane with 1% silver nanoparticles content can reach up to 12 dB. Moreover, the thickness of the spinning fiber membranes is controlled by adjusting the spinning time, so as to better analyze the influence of the thickness of the shielding performance in terahertz band. We attribute this excellent phenomenon to porous structure of the spun fiber membrane and combination of Ti3C2Tx MXene with few-layers and silver nanoparticles to increase the absorption and conductivity of the fiber membrane, thereby enhancing the shielding effect in terahertz range. Meanwhile, the prepared polyacrylonitrile/Ti3C2Tx MXene/silver nanoparticles fiber membranes show good stability and little change in terahertz shielding effect after high temperature annealing. This may provide potential ideas about the development of high-performance terahertz shielding materials, which are of great significance of terahertz electromagnetic shielding.
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Chemistry-An Asian Journal
·
2026
·Vol. 21
·期 5
·e70666
·
IF 3.2
Naseer Ahmad,Linyue Xu,Bei Wang,Danfeng He,Siew Ling Lee,Wei Sun
Nanoplastics are a significant environmental threat due to their persistence and toxicity. In this study, we prepared a kind of Ag-doped Co 3 O 4 catalyst using a coprecipitation method, aimed at enhancing its photocatalytic degradation efficiency of polystyrene nanoplastics under UV irradiation. Morphology and component of Ag/Co 3 O 4 have been investigated by XRD, FTIR, TEM, and BET analysis. The information of absorption and energy levels for catalysts is provided by UV–vis DRS, Tauc plots, and Mott–Schottky curves. Charge-transfer abilities for catalysts have been analyzed by PL spectra and EIS. The photocatalytic activities of Ag nanoparticles (Ag NPs), Co 3 O 4 , and Ag/Co 3 O 4 have been carefully evaluated in this work. Ag/Co 3 O 4 photocatalyst exhibits the highest degradation efficiency with a kinetic rate constant of 0.0086 min − 1 , outperforming that of Co 3 O 4 (0.0062 min − 1 ) and Ag NPs (0.0036 min − 1 ). The degradation efficiencies for catalysts have also been assessed under varying pH conditions (neutral, acidic, and basic). Among them, Ag/Co 3 O 4 shows a notable degradation efficiency of 61% at pH 7, compared to 46% for Co 3 O 4 and 30% for Ag NPs. In addition, the intermediates and final products have also been discussed according to Py-GC/MS results.
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PubMed
高影响因子
Plasmonics
·
2025
·
IF 4.3
Guo Jingtong,Ma Xiaodi,Song Wenjing,Yu Long
This study develops a novel, eco-friendly Surface Enhanced Raman Scattering (SERS) substrate, PDA-MMT/Au@Ag NPs, for ultrasensitive thiram (TRM) detection and pesticide screening. The substrate integrates polydopamine-functionalized montmorillonite (PDA-MMT) with Au@Ag core–shell nanoparticles synthesized via solvent-free photoreduction. MMT enriches analytes and prevents nanoparticle aggregation, while Au@Ag NPs generate high-density plasmonic hotspots. This dual synergy enables exceptional performance: a TRM detection limit of 1.34 × 10⁻⁹ M in solution (far below the FDA limit), with high uniformity (RSD = 9.54%) and stability (> 28 days). The substrate also demonstrates versatility for dyes (R6G, CV, NBA) and other pesticides. Optimization confirmed 30 min UV irradiation and a 1:10 MMT-to-Au@Ag volume ratio as ideal parameters. Characterization by TEM, XRD, XPS, and UV–vis validated the successful synthesis and core–shell structure. Compared to existing SERS platforms, this substrate offers superior sensitivity, reduced noble metal usage, and simpler, chemical-reductant-free fabrication, making it promising for on-site food safety and environmental monitoring.
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ENERGY & FUELS
·
2025
·
IF 5.3
Fanghui Wang,Yitong Dou,Hong Zhu
To enhance the oxygen reduction reaction (ORR) performance of silver-based catalysts in anion-exchange membrane fuel cells (AEMFCs), a novel Co@Ag–AgCl core–shell-structured needle-like nanowire catalyst was synthesized via a polyol-solvothermal method using cetyltrimethylammonium chloride (CTAC) as a surfactant. The results showed that when the CTAC concentration was 5 times the critical micelle concentration, the needle-like nanowires had the best dispersibility, and the synergistic interaction between the Ag–AgCl composite shell and cobalt core significantly enhanced the catalytic performance. The Co@Ag–AgCl3/C catalyst demonstrated exceptional ORR activity with a half-wave potential of 0.753 V, a limiting current density of 4.580 mA cm–2, and an electron transfer number close to 4 (3.88). Remarkably, during 10,000 cycles of durability testing (0.3–1.0 V vs RHE), the half-wave potential of the catalyst only shifted negatively by 17 mV, demonstrating better stability than commercial Pt/C (with a negative shift of 18 mV). This work provides critical insights for developing cost-effective non-platinum catalysts in AEMFCs.
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