ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Changsheng Feng,Yu Tian,Lifang Zheng,Yue Chen,Feiyue Ge,Fang Cheng,Xue-Jun Wu
Chiral plasmonic nanostructures provide an effective way to enhance circular dichroism (CD) activities of natural chiral molecules due to the strong coupling effect between molecular chirality and the surface plasmon. Nonetheless, the impact of the nanostructure parameters on the CD enhancement and the origin of the CD response is still not well-investigated. Here, we report a seed-mediated growth method to synthesize discrete Au@Ag core–shell decahedrons in the presence of cysteine by using concave 5-fold twinned Au nanocrystals as seeds. The produced core–shell decahedrons display a strong CD response in the plasmon resonance region, and the maximum Kuhn’s dissymmetry value (g factor) can reach to as high as 5.8 × 10–3 as well as a large CD enhancement factor over 2000. Comprehensive experiments reveal that embedded chiral cysteine in the outmost layer of the Ag shell plays the paramount role in inducing the CD activity, which ensures the good stability of the CD response of the nanostructures under long-term storage. Our finding inspires the rational design and synthesis of plasmonic CD systems with strong enhancement of the CD activities and expands their potential applications in chiral signal amplification and biosensing.
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PubMed
高影响因子
Advanced Materials Interfaces
·
2025
·
IF 4.4
Hanwei Wang,Haijie Chen,Jian Zhang,Zhiwen Zheng,Xiaolong Liu,Haizhong Wang,Dapeng Feng,Dan Qiao
The low interlayer forces of 2D nanosheets as nano additives are conducive to enhancing the tribological performance of lubricating oil. In this work, ultrathin 2D Co-BDC MOFs nanosheets are successfully synthesized with ultrasonic assistance, and Ag nanoparticles are successfully loaded onto their surfaces via chemical adsorption. The Ag@Co-BDC nanocomposites are demonstrated to significantly improve the tribological performance of PAO10 base oil, leading to a 16.7% reduction in the friction coefficient and a 61.5% decrease in the wear rate. Moreover, macroscopic reaction further confirmed that the introduction of Ag@Co-BDC nano additives facilitated the tribochemical reaction during friction. This work successfully synthesized a novel lubricating additive with excellent tribology performance and provided a preliminary explanation of the mechanism of the tribochemical reaction.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Changkun Song,Hongbiao Huo,Wei Shi,Jianyong Xu,Xiaoting Lei,Bonan Gu,Zhongbo Han,Wenchao Zhang
Surface-enhanced Raman spectroscopy (SERS) is strongly dependent on the metallic plasmonic nanostructures that can generate plasmon resonance coupling effects. Plasmonic nanostructures with sub-nanometer interparticle gaps or cavities have shown great potential in generating high local electromagnetic fields. Unfortunately, achieving precise control over the geometrical morphology of these nanostructures at the sub-nanometer scale presents significant challenges, particularly in applications where high consistency and homogeneity are required. Here, a reliable approach is proposed to construct plasmon-coupled Ag nanosphere-internalized nanocavity (SIC) arrays to enhance sensitivity and reproducibility in SERS sensing. This novel SIC nanostructure consists of a precise arrangement of Ag nanospheres located at the bottom of Au nanocavities, separated by a precisely controlled nano-Al 2 O 3 dielectric layer. The Al 2 O 3 dielectric layer plays a crucial role in inhibiting quantum tunneling effects at the nanogaps, thereby suppressing charge recombination and leading to strong plasmon resonance coupling. The SERS enhancement tends to significantly diminishes as the nanogap size increases from 4 to 10 nm, a spatially averaged SERS enhancement factor of 3.5 * 10 8 was obtained when the gap size is 4 nm, aligning well with the FDTD simulation results. As a representative application, an indirect detection strategy is utilized to selectively detect TNT with a high level of homogeneity and reproducibility, achieving a relative standard deviation of less than 7.8 %. Together with the capability to be fabricated on a flexible polyimide substrate, the SIC substrate shows significant potential for practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Mingyang Liu,Xuxiao Liu,Diqin Fu,Zhenrong Xie,Xiaolin Zou,Wuran Liu,Yueyang Yu,Jihui Wang,Hanqing Wang,Chaobo Tong,Zhiming Cheng,Songmei Wu,Kejian Ding,Yu Yu
Establishment of heteroatoms-participantly coordinating single atom (SA) configuration is placed high expectation for exceptional catalytic property. Meanwhile, simple technologies to construct SA site with low cost had also been pursued in long-term. Herein, we introduced a facile complexing agent-assistant photodeposition strategy for SA Ag-N 3 S 1 asymmetric site catalyst. The modification on substrate by heteroatom doping and the coexisting amine ligands’ complexation with silver cation are concurrently responsible for the construction of SA site. Attributed to modulation in electronic structure states, this Ag-N 3 S 1 site-decorated carbon nitride exhibited extremely strengthened photocatalytic hydrogen production ability. This exploration provides a promising universal strategy for the establishment in SA catalysts of high-efficiency in broader field.
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Nanomaterials
·
2025
·Vol. 15
·期 18
·1383
·
IF 4.3
Hongfei Dou,Jie Wang,Yan Zhao,Junjie Liu,Yannan Li
Aiming at the insufficient broad-spectrum absorption and high carrier complexation rate in the photocatalytic antimicrobial application of TiO2, Ag/TiO2composite materials were prepared by co-precipitation method in this study. The material characterization showed that Ag was uniformly dispersed on the TiO2surface in the form of nanoparticles, and the specific surface area of Ag/TiO2composite materials was enhanced by 59.6% compared with that of pure TiO2, and the mesoporous structure was significantly optimized. Visible photocatalytic tests showed that the degradation rate of Ag/TiO2composite materials for Rh B and M O was more than two times higher than that of pure TiO2. Under dark conditions, the material showed a minimum inhibitory concentration (MIC) of 62.5 μg/mL against Escherichia coli and Staphylococcus aureus, with an antimicrobial rate of 99.8% for 8 h, confirming its non-light-dependent antimicrobial activity. Mechanistic studies revealed that photogenerated electrons were efficiently captured by Ag nanoparticles, which inhibited e-h+complexation; meanwhile, the photothermal effect (ΔT > 15 °C) promoted the sustained release of Ag+, which realized the triple synergistic antimicrobial activity by disrupting the bacterial membrane and interfering with metabolism. This study provides a new strategy for the development of efficient solar-powered water treatment materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jian Yu,Hongpan Zhu,Zizhen Zhou,Xiaofang Liu,Guang Han,Bin Zhang,Xu Lu,Guoyu Wang,Xiaoyuan Zhou
Mg-based compounds are emerging materials for efficient thermoelectric conversion, as exemplified by n-type Mg 3 Sb 2 -based materials, while a high performing p-type Mg 3 Sb 2 material is lacking. EuMg 2 Sb 2 , a derivative of Mg 3 Sb 2 , has revealed potential as a high-performance alternative to p-type Mg 3 Sb 2 -based materials, while pristine EuMg 2 Sb 2 suffers from low carrier concentration. Herein, we reveal that both Zn substitution for Mg and Yb substitution for Eu not only boost the carrier concentration and mobility of p-type EuMg 2 Sb 2 -based materials, but also sharply diminish the lattice thermal conductivity via enhancing phonon scattering. Band structure calculation shows that Zn substitution minimizes the energy difference between different bands at the valence band maximum and reduces the band effective mass, leading to optimized band structure. Combined with the role of Ag doping in increasing the carrier concentration and power factor, p-type Eu 0.5 Yb 0.5 Mg 1.0975 Zn 0.9975 Ag 0.005 Sb 2 sample obtains a maximal dimensionless figure of merit ( zT ) value of 1.18 at 823 K, which compares favorably to those of EuMg 2 Sb 2 and other p-type Mg–Sb-based Zintl materials. This study demonstrates the efficacy and importance of delicate composition engineering in boosting the thermoelectric performance of p-type EuMg 2 Sb 2 .
研究领域:
材料科学
·
热电学
·
固体物理
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ChemistrySelect
·
2025
·Vol. 10
·期 38
·e03531
·
IF 2
Yun Li,Xiaoying Liu,Jinpeng Xue,Jingyi Ma,Xing Li,Wensheng Yang
Silver is widely used in daily life and industry, resulting in environmental release and potential health risks from toxic silver ions (Ag + ). In this study, a paper-based colorimetric sensing strategy utilizing ascorbic acid (AA)-modified gold nanoparticles (AA@AuNPs) was developed for the rapid and portable detection of silver ions in various aqueous matrices. Under optimized conditions, AA coordinates the AuNP surface and promotes the formation of an Ag@Au core–shell upon exposure to Ag+, yielding a distinct colorimetric response. The sensing mechanism and surface chemistry were validated by dynamic light scattering (DLS), transmission electron microscopy (TEM), zeta potential analysis, Fourier-transform infrared spectroscopy (FT-IR), and UV–visible (UV–vis) spectrophotometry. High specificity toward Ag + with strong anti-interference in the presence of common coexisting ions was demonstrated, and a combined-interference test confirmed negligible cross-reactivity. Quantitatively, excellent linearity ( R 2 = 0.99) was achieved, with a UV–vis detection limit of 0.49 µg mL −1 and a naked-eye detection threshold of 6.0 µg mL −1 . The paper strips enabled Ag + capture for post-analysis recovery and safe disposal, reducing secondary pollution relative to solution-based assays. The platform is simple, low-cost, and field-deployable, and validation in tap-water samples with reliable recoveries underscores its potential for on-site Ag + monitoring. Graphical This work presents portable paper test strips embedding ascorbic acid (AA)-modified gold nanoparticles for colorimetric Ag + detection. AA reduces Ag + , yielding Ag@Au core-shells that shift the localized surface plasmon resonance (LSPR) and change color. The assay shows high selectivity with anti-interference, linearity ( R 2 = 0.99), UV-vis LOD 0.49 µg mL −1 , naked-eye threshold 6.0 µg mL −1 , and validated tap-water recoveries.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yingdong Hao,Yingxiao Wang,Pengyu Chen,Lu Chen,Wei Wei,Nannan Sun
Photocatalytic oxidation of methane (CH 4 ) to value-added chemicals offers a sustainable and promising approach for chemical synthesis, however, efficient catalysts for the activation of inert C H bonds remain challenging. Herein, a novel Ag-AgCl biphasic composite was used as co-catalysts to modify ZnO semiconductor (Ag-AgCl/ZnO-z). Structure properties and catalytic performance in photocatalytic oxidation of CH 4 of the sample were systematically investigated, together with comparison with pure ZnO (ZnO-z) and a single Ag modified counterpart (Ag/ZnO-z). It was found that Ag-AgCl/ZnO-z was enriched with heterogeneous interfaces, which facilitated ultrafast carrier transport and their prolonged separation. Interestingly, AgCl acted as a hole acceptor, and the lattice Cl can be directly activated to •Cl, which is then responsible for forming a new •CH 3 formation pathway via a hydrogen atom transfer (HAT) mechanism. Moreover, a Cl-looping process can be established so that the catalyst remained stable during cyclic reactions. Under the optimum conditions, an excellent liquid oxygenates productivity of 12,731 μmol·g −1 ·h −1 was achieved. This work presents a prototype for designing biphasic composite co-catalysts, thereby offering valuable insights into introducing multiple CH 4 activation pathways.
研究领域:
光催化
·
材料科学
·
化学合成
·
能量转换
·
环境化学
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Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 11
·2490-2496
·
IF 0.791
Khan Misbah Ullah,Ullah Hayat,Honey Shehla,Gul Zarif,Ullah Shaheed,Ullah Bakhtar,Manan Abdul,Ullah Munzer,Ali Shad
Abstract Noble metal bimetallic nanostructures, such as Ag and Au, are used in a variety of fields including nanoscience, catalysis, electronics and nanotechnology because of high stability and adsorption rate etc. However controlled synthesis of bimetallic nanostructures is challenging. Therefore, the current study emphasizes on two step controlled synthesis of Au/Ag nanostructures with tunable sizes for catalytic purposes. Using electrochemical deposition (EC) technique, the fabrication of Au/Ag nanostructures were achieved in two stages, through galvanic reaction. The catalytic capabilities of an Au/Ag nanostructure and Ag flower-like structure were examined through reduction of p -nitrophenol in the presence of sodium borohydride (NaBH 4 ). The catalytic investigation was measured in temperatures rage of 25 to 45°C at constant time. The study shows that catalytic activity of Au/Ag nanostructure is higher than that of Ag flower-like structure in the reduction of p -nitrophenol.
研究领域:
纳米科学
·
催化化学
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3646-3652
·
IF 1.338
Yang Ailing,Wang Ning,Wang Yujin,Li Shunpin,Wang Lele,Yang Yun,Bao Xichang,Yang Renqiang
Silver nanoparticles (NPs) with diameters less than 25 nm, and 5, 10, 15, 20-tetrakis(4-carboxy-phenyl) porphyrin potassium salt (K4TCPPS) was synthesized. By adding silver colloids into the K4TCPPS solutions, the fluorescence concentration quenching of the K4TCPPS
solutions was improved between 1×10−6–5×10−4 M, depending on the size of the Ag NPs, the concentration of the K4TCPPS and the excitation wavelength. Under excitation wavelengths of 360 and 414 nm, the enhancement was in the range
of 0.34–22.8, and 0.71–82.46, respectively. The enhancement increased with decreasing size of the Ag NPs. At the two highest enhancements, the concentrations of the K4TCPPS solutions were 1×10−4 and 1×10−5 M respectively,
and the size of the Ag NPs was about 5 nm. The main reasons for the fluorescence enhancing effect are due to fluorescence resonance energy transfer (FRET) between K4TCPPS molecules and Ag NPs, and decreased collision quenching between free K4TCPPS molecules, and free K4TCPPS
molecules with Ag NPs. Our results showed that Ag NPs with sizes of about 5 nm can effectively improve the fluorescence concentration quenching of K4TCPPS solutions. This result also suggests that it is possible to use noble metal NPs to improve fluorescence concentration quenching.
研究领域:
材料科学
·
光学
·
生物化学
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高影响因子
KEY ENGINEERING MATERIALS
·
2014
·
IF 0
Wei Zhou,Zhi Qiang He,Xiu Jian Zhao
Metal-enhanced fluorescence (MEF) of Ag nanoparticles (NPs) in the presence of dye molecules has been studied for application in luminescent solar concentrator (LSC) devices. The LSC was prepared from bulk polymerization reaction of methyl methacrylate (MMA), which was the matrix for the LSC devices. The polymethyl methacrylate (PMMA) sheets doped by different dye concentrations were produced. The optical properties were characterized by absorption, emission and transmission spectroscopy measurements. Effects of dye concentrations on the photovoltaic performance of LSCs were investigated and discussed. Moreover, different concentrations of Ag nanoparticles were dispersed in the matrix in the presence of dye molecules in order to study the metal-enhanced fluorescence in material. The optimal concentration of Ag NPs resulting in a maximum fluorescence emission enhancement (almost 90 %) has been obtained which induced by the particular dye/Ag NPs composite materials. It depends on the coupling and spacing between neighboring dyes and Ag NPs. The result showed that the continuous transition from fluorescence enhancement to quenching, depending on Ag NPs concentration in the LSC device. The highest efficiency (1.96%) was achieved in solar cells which were assembled by the side of the PMMA sheets with dye concentration at 20 ppm.
研究领域:
材料科学
·
光学工程
·
能源技术
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Jie Yang,Weiwei Li,Yilong Zhou,Huixin Liu,Kaiyuan Pei
High-performance materials often require high toughness and strength . Unfortunately, in most composites, toughness and strength are almost mutually exclusive. The simple combination of brittle carbon fibers (CFs) and rigid polyurethane (RPU) obviously cannot meet the standards of high-performance materials. In this paper, the spiral CFs (SS-CFs) were obtained by the electrodeposition . From the point of view of fracture mechanics , fracture resistance increases with crack propagation . This spiral structure provides more crack propagation paths, resulting in more energy consumption, which can lead to materials properties that are much higher than simple mixture. The results showed that the interfacial shear strength, tensile toughness, tensile strength, and impact toughness of SS-CFs/RPU composites were increased by 73.6%, 77.2%, 103.3% and 85.0%, respectively, compared with the pristine CFs/RPU composites. The main strengthening mechanisms of the materials were the pinning effect and the effective increase of the crack propagation pathway by the convex SS-CFs. At the same time, due to the deposition of the silver coating on the CF surface, the modified CFs composites also had excellent electrical conductivity and electromagnetic shielding performance. This means that our materials have a wide range of applications.
研究领域:
材料科学
·
力学
·
纳米技术
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高影响因子
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