MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Jiamin Fang,Dexin Chen,Xiaojing Fang,Peng Zhang,Jing Sang,Hidetoshi Hirahara,Sumio Aisawa,Wei Li
Introduction of hard phases into soft metal coatings is a widely used strategy to improve the tribological behavior and antiwear properties during current-carrying friction. In this work, we developed silver (Ag) composite coatings reinforced with nanodiamonds (NDs) using a self-devoloped rotating spray deposition technology. The composite coatings, with a 0–10 g/L rage concentrations of NDs, were comprehensively characterized for morphology, chemical composition, hardness, and current-carrying tribological behavior and antiwear properties. Thanks to the unique advantages of our fabrication technique, the coatings show a dense structure with strong interfacial bonding both at the coating-copper substrate interface and between the Ag matrix and NDs in composite coatings. The addition of NDs not only maintains excellent electrical conductivity (minimum 98.1 %ICAS) but also boosts microhardness to 169 HV. Uniformly dispersed NDs effectively enhance the tribological behavior and wear resistance, keeping the friction coefficient stable at 0.1–0.2 and reducing the wear rate significantly with the shallowest wear track measuring only 6 μm. Finally, the worn subsurface structure of wear tracks was analysized to confirm the good bonding between NDs and the Ag matrix, as well as the dispersion-strengthening effect of NDs within the Ag matrix and the plastic deformation mechanism of Ag during current-carrying friction. This study not only enriches the enhancing mechanism in hard-phase-reinforced composites but also provides new insights and approaches for the development of electric contact coating materials.
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Penghui Wei,Jiajia Song,Haibin Tang,Qinglin Shi,Yongqing Ma,Ganhong Zheng,Meiling Wang,Sajid Imran,Muhammad Usman Amin,Yilin Lu,Chuhong Zhu
In this study, we present a simple and facile synthesis approach to fabricate highly sensitive surface-enhanced Raman scattering (SERS) substrates by electrodeposition of silver (Ag) nanostructures into aluminum oxide (Al2O3) honeycomb microchannel periodic arrays (HMPAs). The spatial confinement and morphology of Ag nanostructures was precisely tuned by varying different deposition parameters. The SERS performance of the as prepared Ag nanostructures were evaluated. The hierarchical flower-like Ag nanostructures demonstrated the highest Raman signal enhancement as compared to other nanostructures electrodepsosited in the HMPAs. The densely packed network of plasmonic "hot spots" generated by the hierarchical flower-like Ag nanostructures, as well as the confinement of analyte molecules near the metal surface in Al2O3 HMPAs, are responsible for Raman signal enhancement. The hierarchical flower-like Ag nanostructure array achieved a limit of detection (LOD) of 9.3 × 10⁻11 M for rhodamine 6G (R-6G) and an enhancement factor (EF) of 6.99 × 107. This work highlights the significance of nanostructure’s precision over a large area and spatial confinement of analyte molecules in or near "hot spots", for enhanced SERS sensitivity and broad applicability in chemical analysis.
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-10
·
IF 2.101
Li Lei,Zhao Aiwu,Wang Dapeng,Guo Hongyan,Sun Henghui,He Qinye
The cube-like Fe 3 O 4 @SiO 2 @Ag (FSA) nanocomposites with great SERS activity have been successfully synthesized by a layer-by-layer procedure in this paper. The cube-like Fe 3 O 4 @SiO 2 core–shell structures were prepared via a new route and Ag nanoparticles were introduced onto their surface through a one-pot hydrothermal reaction. By controlling the reaction time, the coverage rate of Ag on the FSA surface could be tuned, and then a series of FSA composites were obtained. The SERS properties of these FSA composites were investigated using p -aminothiophenol ( p -ATP) as the probe molecule. It was found that the FSA composites synthesized with a reaction time of 6 h showed the best SERS performance, and the detection limit for p -ATP could reach 1 × 10 −7 M. For practical application, the FSA composites were also used to detect thiram, one of the dithiocarbamate fungicides that has been widely used as a pesticide in agriculture. The detection limit is as low as 1 × 10 −6 M (0.24 ppm), lower than the maximal residue limit of 7 ppm in fruit prescribed by the US Environmental Protection Agency. The resulting substrate with high SERS activity, stability and strong magnetic responsivity makes the FSA composite a perfect choice for practical SERS detection applications.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Sheng Chen,Wenji Wang,Mingming Yan,Qin Tu,Shu-Wei Chen,Tianbao Li,Mao-Sen Yuan,Jinyi Wang
The sensitive detection and quantification of heavy and transition metal ions are particularly important. Among them, mercury(II) (Hg 2+ ) and silver(I) (Ag + ) ions, as the most ubiquitous heavy metal ion pollutants, are difficult to discriminate in the same system because of their similar reactions and coordination abilities. Herein, we designed and synthesized a “turn-on” chemosensor, RBTP , which is an intergrant of rhodol and 2-hydroxy benzothiazole by introducing a benzothiazole unit to the ortho -position of the phenolic hydroxy of rhodol. RBTP showed a sensitive dual-channel fluorescence-enhanced response to Hg 2+ and Ag + at 595 and 520 nm with low detection limits of 0.27 and 0.45 μM, respectively. Studies of their sensing mechanism indicated that the Hg 2+ -induced orange fluorescence at 595 nm originates from an irreversible Hg 2+ -promoted oxadiazole forming reaction and the Ag + -induced green fluorescence at 520 nm originates from special molecular packing of the RBTP -Ag + complex. Furthermore, the potential of probe RBTP as practical biological imaging agents was further confirmed in HepG2 cells. Simultaneously, RBTP exhibited remarkable solid-state luminescence with an aggregation-induced emission (AIE) feature. The AIE mechanism was thoroughly explored using X-ray single-crystal structures and photophysical determinations.
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DOI
高影响因子
TETRAHEDRON
·
2019
·
IF 2.379
Jingyuan Li,Qingwen Song,Hengxuan Zhang,Ping Liu,Kan Zhang,Junwen Wang,Dengsong Zhang
Chemical fixation of carbon dioxide under mild reaction conditions e.g. atmospheric pressure and low temperature depends upon the ability of catalyst. Herein, a synergistic catalytic scheme of silver sulfadiazine/ n Bu 4 NBr was described for the three-component reaction of propargylic alcohols, CO 2 , and monohydric alcohols. This catalytic system was demonstrated effectively to provide β-oxopropyl carbonates in excellent yields (up to 99% yield with 5 mol% catalyst). The method tolerated a wide scope of propargylic alcohols and monohydric alcohols under atmospheric CO 2 pressure and solvent-free conditions. The excellent catalytic performance was attributed to the synergistic catalysis confirmed by the careful experiments.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaopeng Fan,Dan Zhang,Hongjuan Li,Shiguo Sun,Yongqian Xu
A novel near infrared (NIR) fluorescent hybrid system ( PD-SQ ⊂ BSA ) assembled from squaraine dye PD-SQ and bovine serum albumin (BSA) was developed for selective detection of Ag + over other metal ions in absolute PBS. The detection limit of PD-SQ ⊂ BSA for Ag + is calculated to be about 8.99 × 10 −8 M, which is lower than the guidelines for drinking water set by the WHO. PD-SQ alone shows very weak fluorescence due to aggregation-caused quenching (ACQ) property. BSA can cause PD-SQ to partially disaggregate through electrostatic and hydrophobic interactions, but various metal ions including Ag + cannot do. Interestingly, the presence of both BSA and Ag + can trigger PD-SQ to almost completely disaggregate through synergic binding of multiple S-Ag linkings derived from the biothiol moieties in BSA and PD-SQ with Ag + , resulting in obvious turn-on fluorescence change. Absorption and field emission scanning electron microscope (FESEM) spectra have been used to prove the conversion of PD-SQ from aggregates to monomers. In addition, based on the fluorescence spectra changes of PD-SQ ⊂ BSA system upon addition of Hg 2+ and ethylenediaminetetraacetic acid (EDTA), logic circuits including AND and INHIBIT logic gates with reset function were successfully constructed. This type of fluorescent system shows great potential for disease diagnosis, environmental protection, and information protection at the molecular scale.
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DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Baoquan Feng,Yiran Cheng,Chengyan Liu,Jie Gao,Guojing Wu,Xiaobo Bai,Ruifan Si,Wenpei Li,Yue Guo,Lei Miao
Ag2Se-based thermoelectric (TE) materials have attracted significant attention recently due to their potential application near room temperature. Manipulating the stoichiometric ratio of Ag/Se and anion doping are usually used as effective approaches to enhance the TE properties. Here, we report a strategy to simultaneously enhance the power factor (PF) and reduce the thermal conductivity of Ag2Se by introducing ZnSe nano-precipitates. The excessive carrier concentration in the intrinsic Ag2Se is successfully reduced by the Ag interstitial inhibition due to the introduction of secondary-phase ZnSe nano-precipitates, thereby enhancing the PF up to a maximum value of ∼22.2 μW m–1 K–2 at 383 K and decreasing the electronic thermal conductivity from ∼1.2 to ∼0.8 W m–1 K–1 at 383 K. In addition, the phonon scattering at ZnSe nano-precipitates contributes to the reduction of lattice thermal conductivity from ∼0.5 to ∼0.4 W m–1 K–1 at 383 K. As a result, a high peak zT of ∼0.7 at 383 K and an average zT of 0.6 at 313–383 K are obtained in the sample Ag2Se-0.005ZnSe, which is one of the highest values amongst Ag2Se-based TE materials. This study could provide guidance to improve the TE properties of materials similar to Ag2Se.
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiang Yu,Jiaoming Wang,Xionghui Fu,Hui Meng,Yi Zhu,Yuanming Zhang
In this work, we successfully constructed visible-light-driven Z-scheme SrTiO 3 /Ag/Ag 3 PO 4 photocatalyst with oxygen vacancies, which exhibited highly enhanced performance for antibiotic tetracycline (TC) photodegradation compared with pure Ag 3 PO 4 and SrTiO 3 . SrTiO 3 /Ag/Ag 3 PO 4 (1:3) exhibited the best photocatalytic performance under visible light illumination, the rate constant k of which was about 2.72 and 18.55 folds higher than that of Ag 3 PO 4 and SrTiO 3 , respectively. No significant deactivation of photocatalytic performance over SrTiO 3 /Ag/Ag 3 PO 4 (1:3) after five consecutive cycles confirmed an enhanced stability, compared to pure Ag 3 PO 4 , which showed 22.1% decrease in photocatalytic activity under the same condition. The significantly boosted photocatalytic activity of the composites could be ascribed to the improved stability of Ag 3 PO 4 , superior carrier separation efficiency and higher redox capacities resulted from Z-scheme, in which metal Ag played the role as the charge transmission-bridge to quench electrons from conducting level of Ag 3 PO 4 with holes from defect levels of SrTiO 3 with oxygen vacancies under visible light illumination. Furthermore, a possible degradation pathway for TC was also proposed based on HPLC-MS. The work offered an excellent reference for further understanding and constructing Z-scheme heterojunctions which were potential candidates for degrading antibiotics in environmental purification.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Xiaohui Guan,Jingyang Chen,Enze Zhu,Penggang Yin,Liu Yang,Xin Guan,Guangsheng Wang
Layered double hydroxides (LDHs) are promising electrode candidates for supercapacitors. However, limitations like inferior cycling stability and unsatisfactory charge storage capability at low temperatures have exerted negative effects on their applications. Herein, a novel synthetic process has been elaborately designed and provided to have the composition and structure of the C/N-NiCoMn-LDH/Ag (C/N-CNMA) delicately regulated. Both the experimental and theoretical researches unveil that the incorporated manganese species and elemental silver could dramatically modulate the bandgap, crystallinity and surface electron structure of the LDH , leading to the remarkable improvement in its conductivity, exposed active sites and intrinsic electrochemical activity, and thus the OH* and O* adsorption free energy could be remarkably optimized, even at low temperatures. In addition, the low crystallinity C/N-CNMA is of great electrochemical compatibility with both the KOH aqueous electrolyte and the isobutyl alcohol (IPA) modulated organohydrogel electrolyte. By means of adjusting the solvation and hydrogen bonding in the electrolytes, the assembled hybrid supercapacitors deliver excellent energy density, power density and cycling stability in the temperature range of -30 to 25 °C. Specifically, the gel electrolyte with IPA as the anti-freezing functional additive displays high flexibility and ionic conductivity at low temperatures.
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DOI
高影响因子
SYNLETT
·
2021
·Vol. 32
·期 14
·1437-1446
·
IF 2.454
Haifei Wang,Chuliang Gong,Chen Zhang,Xiaojun Zheng,Qinglin Hou,Qingxia Zhou,Guiyin Zhou,Yao Chen
In this work, we introduced a multifunctional Ag(I)/CAAA-amidphos complex catalyzed asymmetric 1,3-dipolar cycloaddition of acrylates with α-imino esters, affording a series of 2,4,5-trisubstituted endo-pyrrolidines in good yields (up to 97%) with high enantioselectivities (up to 98% ee). Meanwhile, the catalytic system was also applied in the three-component one-pot reaction of α-imino esters formed in situ under the action of N,N′-diisopropylcarbodiimide. In addition, the gram-scale reaction was realized for the formal synthesis of (+)-ibophyllidine in eight steps.
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DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2018
·Vol. 16
·期 1
·1-16
·
IF 5.294
Fan Wei,Sun Qing,Li Yanyun,Tay Franklin R.,Fan Bing
Background Ag + and Zn 2+ have already been used in combinations to obtain both enhanced antibacterial effect and low cytotoxicity. Despite this, it is still unclear how the Zn 2+ co-works with Ag + in the synergistic antibacterial activity. The main purposes of this study were to investigate the co-work pattern and optimum ratio between Ag + and Zn 2+ in their synergistic antibacterial activity against E. faecalis , the possible mechanisms behind this synergy and the primary application of optimum Ag + –Zn 2+ co-work pattern against the E. faecalis biofilm on dentin. A serial of Ag + –Zn 2+ atomic combination ratios were tested on both planktonic and biofilm-resident E. faecalis on dentin, their antibacterial efficiency was calculated and optimum ratio determined. And the cytotoxicity of various Ag + –Zn 2+ atomic ratios was tested on MC3T3-E1 Cells. The role of Zn 2+ in Ag + –Zn 2+ co-work was evaluated using a Zn 2+ pretreatment study and membrane potential—permeability measurement. Results The results showed that the synergistically promoted antibacterial effect of Ag + –Zn 2+ combinations was Zn 2+ amount-dependent with the 1:9 and 1:12 Ag + –Zn 2+ atomic ratios showing the most powerful ability against both planktonic and biofilm-resident E. faecalis. This co-work could likely be attributed to the depolarization of E. faecalis cell membrane by the addition of Zn 2+ . The cytotoxicity of the Ag + –Zn 2+ atomic ratios of 1:9 and 1:12 was much lower than 2% chlorhexidine. Conclusions The Ag + –Zn 2+ atomic ratios of 1:9 and 1:12 demonstrated similar strong ability against E. faecalis biofilm on dentin but much lower cytotoxicity than 2% chlorhexidine. New medications containing optimum Ag + –Zn 2+ atomic ratios higher than 1:6, such as 1:9 or 1:12, could be developed against E. faecalis infection in root canals of teeth or any other parts of human body.
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DOI
PubMed
高影响因子
TALANTA
·
2015
·
IF 3.545
Di Zhang,Ying Sun,Qiong Wu,Pinyi Ma,Hua Zhang,Yuanpeng Wang,Daqian Song
A novel surface plasmon resonance (SPR) biosensor based on Ag nanocubes/chitosan composite was fabricated for mouse IgG detection. Ag nanocubes (AgNCs) were successfully synthesized with sulfide-mediated protocol. They were characterized with transmission electron microscopy (TEM) and UV–vis adsorption spectrum. AgNCs were etched by 3-Mercaptopropinic acid (MPA) and simply mixed with chitosan and glutaraldehyde . The Ag nanocubes/chitosan composite was deposited on Au film by the spin-coating. The electronic coupling between the AgNCs and the surface plasmon wave leads to the amplification of the SPR response, which results in the sensitivity enhancement of SPR biosensor. Moreover, antibody can be immobilized on Au film with aldehyde groups via Schiff alkali reaction. The traditional SPR biosensor based on MPA shows a response for mouse IgG in the concentration range of 2.50–40.00 μg mL −1 . The SPR biosensor based on AgNCs/chitosan composite shows a good response for mouse IgG in the concentration range of 0.60–40.00 μg mL −1 . The limit of quantification by the biosensor based on AgNCs/chitosan composite substrate is about 4 times lower than traditional biosensor, which has proved the SPR biosensor here proposed with more sensitivity and better performance than traditional SPR biosensor.
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DOI
PubMed
高影响因子
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