JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
·
IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 3
·1-11
·
IF 2.5
Hu Jiaming,Han Xiuxun,Zhu Wuzhi,Wu Fangfang,Tan Xiaohui
Incorporating substitutional elements from groups I, II and IV is an important approach to improve the quality of kesterite thin films. Among the elements, Ag and Ge are most effective in promoting the performance of Cu 2 ZnSn(S,Se) 4 solar cells. Although several theoretical and experimental studies have been conducted on the Ag/Ge-alloyed kesterite, there are significant differences in the reported morphological characteristics, photovoltaic performance and even the optimal Ag/Ge substitution ratio due to different preparation processes utilized, which leads to difficulties in comparing the Ag-incorporated and Ge-incorporated kesterite solar cells. Currently, there is little literature on the comparative study concerned. Herein, we fabricated Ag-alloyed and Ge-alloyed kesterite solar cells based on the same solution method and process conditions, and laterally compared the effects of Ag substitution and Ge substitution on the phase compositions, morphologies, optical bandgaps, minority carrier lifetime and device performance of kesterite Cu 2 ZnSn(S,Se) 4 thin films.
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Food Analytical Methods
·
2024
·Vol. 17
·期 4
·585-593
·
IF 2.6
Wang Haoyu,Zhang Li,Chen Chen,Waterhouse Geoffrey I. N.,Sun Yufeng,Xu Zhixiang
In this study, a sensitive surface-enhanced Raman scattering (SERS) sensor based on core–shell-structured Au@Ag nanoparticles (NPs) was successfully developed for the detection of acrylamide (AA) in foods. Coating Au NPs with a shell of silver gave the Au@Ag NPs outstanding SERS performance for AA detection. Under the optimal experimental conditions, a good linear relationship was established SERS intensity at 1272 cm −1 and the logarithm of the AA concentration (over the concentration range 10 −8 ‒10 −3 mol L −1 ). The limit of detection (LOD) of the SERS method was 1.27 × 10 −9 mol L −1 . The recoveries of AA in spiked cookie samples were in the range of 85.68–102.50%. In addition, the SERS sensor was used to determine the content of AA in three food samples (potato chips, fried dough twist, and instant coffee), with the results obtained being consistent with those determined by high-performance liquid chromatography (HPLC), demonstrating that the SERS sensor was suitable for the detection of AA in real food samples.
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ANALYST
·
2017
·Vol. 142
·期 14
·2587-2594
·
IF 3.885
Lina Zhang,Yanhu Wang,Lei Shen,Jinghua Yu,Shenguang Ge,Mei Yan
In this study, hyperbranched polyethyleneimine-protected silver nanoclusters (hPEI-AgNCs) with excellent electrochemiluminescence (ECL) emission in the presence of coreactant K2S2O8 were prepared by chemical reduction of silver ions (silver nitrate) coordinated with dendrigraft polymer, and successfully used for the construction of an ECL immunosensor. Polyaniline (PANI)/polypyrrole (PPy)-silver (Ag) dendrites with good electrical conductivity and biocompatibility were electropolymerized on the surface of indium tin oxide (ITO) electrode as carriers. Porous ZnO sphere-loaded hPEI-AgNCs-induced signal amplification strategies were integrated exquisitely and applied sufficiently. Taking carcinoembryonic antigen (CEA) as an example, under optimal conditions, the CEA concentration was determined to be in the range of 10−3 ng mL−1–100 ng mL−1 and with a detection limit of 0.4 pg mL−1 using this method; it exhibited excellent selectivity, high stability, and acceptable fabrication reproducibility. It was anticipated that hPEI-AgNCs would have promising applications in green, selective, and sensitive detection of target analytes in the future.
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JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Bo Pang,Zhan Wu,Wenkui Zhang,Hui Huang,Yongping Gan,Yang Xia,Xinping He,Xinhui Xia,Jun Zhang
Agroydite Li 6 PS 5 Cl is one of the most promising solid electrolytes because of its high ionic conductivity and good processability. However, there are still many challenges with Li 6 PS 5 Cl and lithium anodes that prevent their industrialization, such as the growth of lithium dendrite and interfacial reactions. Interface modification of anodes has proven to be an effective method for solving these problems. Herein, we introduce Ag nanoparticles into the interface between Li 6 PS 5 Cl and metallic lithium and systematically investigate their interfacial properties . By incorporating silver nanoparticles , lithium dendrites can be depleted by forming Li–Ag alloys. Therefore, a denser and more stable interface between Li 6 PS 5 Cl and lithium metals is obtained. Benefiting from the above advantages, the Li/Li symmetrical battery with incorporated Ag nanoparticles exhibited an ultrahigh critical current density of up to 10 mA cm −2 and great cycling stability (more than 600 h). An all-solid-state battery with Ni-rich cathode and lithium metal anode demonstrates a high-capacity retention rate of 84% after 200 cycles at a current density of 0.5C. This study provides new insights into the construction of stable anode interfaces for the practical application of all-solid-state lithium batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qiaojie Luo,Zhenzhen Zhang,Yadong Chen,Chang Shu,Yajie Cheng,Yanji Lu,Jiajia Xu,Xiaodong Li
Deep caries management faces a critical dilemma: preserving pulp vitality versus ensuring durable restoration. Current dentin bonding technique and materials fail to eliminate residual pathogens in preserved soft dentin or stabilize resin-dentin interfaces against enzymatic/microbial degradation. Here, we present a light-programmable AgCl@Ag nanoparticle system that overcomes these dual challenges through dynamic nanochemistry. By orchestrating in situ AgCl deposition and photoreduction, our strategy achieves three breakthroughs: (1) Structural reinforcement: Polarity-driven Ag + chelation masks polar groups in demineralized dentin matrix (DDM), releasing interface confined water while doubling DDM modulus, greatly enhancing BisGMA infiltration to realize hermetic seal at the cavity periphery; (2) Sequential antibacterial action: Ag + rapidly penetrates biofilms to form AgCl NPs, followed by light-triggered transformation from AgCl NPs to AgCl@Ag NPs to generate Cl₂/HClO for residual pathogen eradication, to achieve a bacteria-free environment; (3) Self-stabilizing interface: Reducible AgCl@Ag nanoparticles inhibit MMPs and resist microbes and aging-induced delamination. This photo-responsive system eliminates secondary caries risk while maintaining pulp vitality, seamlessly integrating with clinical workflows. Through spatiotemporal control of silver chemistry, we redefine dental adhesion as intelligent platform to construct a biointerface that concurrently achieve sterilization, structural optimization, and enzymatic resistance. Our work establishes a paradigm for adaptive material design in moist biological environments, with implications extending to bone adhesives and chronic wound management.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanyan Wang,Guobao Li,Youxin Hao,Yuhan Xie,Xintian Li,Changlong Chen,Anning Jiang
In recent years, the rapid economic development has significantly altered industrial production and human lifestyle, resulting in the exacerbation of water pollution. Consequently, photocatalytic technology has received considerable attention as an environmentally friendly and efficient approach for wastewater treatment. In this paper, WO 3 /SiO 2 /SnO 2 composite films were prepared by sol-gel method and subsequently co-doped with Ce, Fe and Ag ions. The photocatalytic performances of these modified composite films toward degradation of methyl green (MG) and tetracycline (TC) were systematically evaluated under UV and visible light irradiation. Comprehensive characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Nitrogen adsorption desorption isotherm test, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), and photoluminescence (PL) spectrascopy, were employed to investigate the crystalline phase, morphology, particle size, chemical composition, specific surface area and optical properties of the prepared composite films. The PL spectral analysis revealed that the co-doping of Ce, Fe and Ag significantly enhanced the separation efficiency of photogenerated charge carrier in the WO 3 /SiO 2 /SnO 2 composite films. Radical trapping experiments demonstrated that superoxide radicals (·O 2 - ) and hydoxyl radicals (·OH) played predominant roles in the photocatalytic degradation process. Notably, the prepared photocatalyst maintained stable performance through five consecutive recycling tests, demonstrating excellent reusability. The enhanced photocatalytic activity of the WO 3 /SiO 2 /SnO 2 -Ce/Fe/Ag composite films can be attributed to the impactful suppression of electron-hole recombination through the strategic incorporation of dopant ions.
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RSC Advances
·
2025
·Vol. 15
·期 13
·10310-10318
·
IF 4.6
Rui Wu,Xi Song,Yulin Wang,Qiang Zhang
Considering that pesticide residues cause significant harm to health and the environment, it is crucial and urgent to fabricate surface-enhanced Raman scattering (SERS) substrates with high sensitivity to detect pesticide residues. In this study, a three-layer structure of multifunctional Fe3O4/GO/Ag nanoparticles (NPs) as an active substrate for SERS was fabricated and comprehensively characterized through X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental mapping, and X-ray photoelectron spectroscopy (XPS). The active substrate was used to detect thiram pesticide through SERS. Combined with the synergistic effect, Ag NPs and graphene oxide (GO) possessed high-density and ordered hot spots to enhance the electromagnetic field; therefore, signal amplification and fascinating sensitivity were achieved. The lowest concentration of thiram for clear presentation of the peak was 10−12 mol L−1. There was a satisfactory linear relationship, ranging from 10−10 to 10−4 mol L−1, with a low limit of detection, high sensitivity, satisfactory enhancement factor (EF), stability, and repeatability. In addition, Fe3O4/GO/Ag was successfully applied to identify pesticide residues in a practical sample. Furthermore, the enhancement mechanism, including electromagnetic enhancement and chemical reinforcement, is discussed in detail. Fe3O4/GO/Ag is a potential active substrate for SERS and can be applied for rapid detection in the food industry, environmental fields and biomedicine with fascinating sensitivity.
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PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Lei Chen,Kexin Hu,Jiaqi Wang,Guangyu Ge,Ran Ma,Yongning Wu,Qinghua He
The simultaneous detection and removal of Ag + from drinking water was crucial for preventing human health, while it was also extremely challenging due to bifunctional materials that combine both Ag + adsorption and detection functions rarely being explored. In this study, a benzotrithiophene-based covalent organic framework (TAPA-BTT) was synthesized and applied to detect and remove Ag + . TAPA-BTT exhibited high crystallinity, a large specific surface area, and good thermal stability. As a fluorescent probe, TAPA-BTT had a low detection limit (0.14 μg/L), wide linear range (0.2-700 μg/L), and good linearity (R 2 > 0.9948). It was also successfully applied to identify Ag + in drinking water including tap, pure, and mineral water with satisfactory detection performance. Moreover, TAPA-BTT had a high efficiency in removing Ag + from water, offering a high capacity for adsorption (344.83 mg/g) and a removal rate of 99.45%. The adsorption of TAPA-BTT towards Ag + can be well explained by the quasi-second-order kinetic model and the Langmuir isotherm model. In addition, experimental and theoretical studies revealed the interaction mechanism between TAPA-BTT and Ag + . The specific Ag + detection by TAPA-BTT was assumed to be caused by the electron transfer from thiophene-S to Ag + , which enhanced the fluorescence of TAPA-BTT. The effective removal of Ag + was attributed to the co-chelation of imine-N and thiophene-S on TAPA-BTT. These novel findings revealed the great potential of benzotrithiophene-based COFs in the detection and removal of Ag + , providing a new strategy and alternative material for monitoring and controlling Ag + in drinking water.
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RSC Advances
·
2024
·Vol. 14
·期 20
·13719-13733
·
IF 3.9
Qilin Han,Zhiyao Wu,Yu Zhou,Yongxin Lei,Bingying Nie,Leilei Yang,Wenbin Zhong,Nannan Wang,Yanqiu Zhu
Developing low-cost and efficient photocatalyst/co-catalyst systems that promote CO2 reduction remains a challenge. In this work, Ag–Ti3C2Tx composites were made using a self-reduction technique, and unique Ag–Ti3C2Tx/ZnO ternary heterojunction structure photocatalysts were created using an electrostatic self-assembly process. The photocatalyst's close-contact heterogeneous interface increases photogenerated carrier migration efficiency. The combination of Ti3C2Tx and Ag improves the adsorption active sites and reaction centers for ZnO, making it a key site for CO2 adsorption and activation. The best photocatalysts had CO and CH4 reduction efficiencies of 11.985 and 0.768 μmol g−1 h−1, respectively. The CO2 conversion was 3.35 times better than that of pure ZnO, which demonstrated remarkable stability even after four cycle trials with no sacrificial agent. Furthermore, in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) and valence band spectroscopy were utilized to propose the photocatalytic reaction mechanism and electron transfer channels of the Ag–Ti3C2Tx/ZnO system, confirming that CHO* and CO* are the important intermediates in the generation of CH4 and CO. This study introduces a novel method for the development of new and efficient photocatalysts and reveals that Ti3C2Tx MXene is a viable co-catalyst for applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 12
·1-10
·
IF 2.8
Zheng Haoran,Yu Shihui,Bai Jinke
A scalable strategy is proposed for preparing ultra-flexible transparent heaters (THs) with ZnO-Ag core–shell nanowires (ZnO@Ag NWs) embedded in polyvinylidene fluoride composite films. The obtained THs exhibit a high average transmittance of 85.8% in the visible spectral range and excellent heating performance. The maximum saturation temperature can reach 153 °C within 10 s at an input voltage of 4.0 V. Furthermore, the saturation temperature of THs has not changed significantly after 1000 bending cycles with a curvature radius of 0.5 mm, demonstrating excellent mechanical flexibility. In particular, the THs possess environmental endurance, and no significant deterioration in performance can be found after exposure to high humidity (relative humidity: 85%) and ultraviolet ozone (254 and 185 nm) irradiation for 10 h, which is attributed to the protective role provided by the covering of ZnO shells on the Ag NWs. These outstanding parameters make the fabricated THs to be promising for application in wearable systems, medical thermotherapy pads and industrial defrosters.
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ANALYST
·
2013
·Vol. 138
·期 12
·3388-3393
·
IF 3.969
Xiaochun Jiang,Kun Chen,Jing Wang,Kang Shao,Tao Fu,Feng Shao,Donglian Lu,Jiangong Liang,M. Frahat Foda,Heyou Han
A new electrochemical immunosensor based on solid-state voltammetry was fabricated for the detection of Escherichia coli (E. coli) by using graphene oxide–Ag nanoparticle composites (P-GO–Ag) as labels. To construct the platform, Au nanoparticles (AuNPs) were first self-assembled on an Au electrode surface through cysteamine and served as an effective matrix for antibody (Ab) attachment. Under a sandwich-type immunoassay format, the analyte and the probe (P-GO–Ag–Ab) were successively captured onto the immunosensor. Finally, the bonded AgNPs were detected through a solid-state redox process in 0.2 M of KCl solution. Combining the advantages of the high-loading capability of graphene oxide with promoted electron-transfer rate of AuNPs, this immunosensor produced a 26.92-fold signal enhancement compared with the unamplified protocol. Under the optimal conditions, the immunosensor exhibited a wide linear dependence on the logarithm of the concentration of E. coli ranging from 50 to 1.0 × 106 cfu mL−1 with a detection limit of 10 cfu mL−1. Moreover, as a practical application, the proposed immunosensor was used to monitor E. coli in lake water with satisfactory results.
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