CRYSTENGCOMM
·
2014
·Vol. 16
·期 38
·9075-9082
·
IF 3.858
Shuling Xu,Haibo Li,Lei Wang,Qiaoli Yue,Sun Sixiu,Jifeng Liu
In this report, Ag@Cu yolk–shell nanostructures have been synthesized through a facile one-pot hydrothermal method. The synthesis is based on the use of N,N-dimethylformamide (DMF) as both the reducing agent and solvent, in the presence of the polymer poly(vinylpyrrolidone) (PVP). The structure and composition of the yolk–shell nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometry (EDS). To study the formation process of the Ag@Cu yolk–shell nanostructures, the samples obtained at various stages of the growth process were studied by TEM and XRD, and a rational growth mechanism for the Ag@Cu yolk–shell nanostructures was proposed. The as-prepared Ag@Cu yolk–shell nanostructures were used to construct non-enzymatic glucose sensors. The detecting results show that the designed sensors have well-defined, stable and fast amperometric responses to glucose.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2024
·
IF 4.9
Zheng Jiaojiao,Cao Tianyu,Wang Jianxiao,Xu Wenhao,Qu Yihan,Wang Jiafen,Wu Yunlong,Song Yanyan,He Lizhong,Chen Xudong,Yang Jie,Qu Yinhu
Engineering the active layer of pressure sensors with micro-nano structures is increasingly important in improving their sensing properties, such as sensitivity and detection range. However, existing structures based on template methods continue to face manufacturing challenges and uncontrolled structures, making it difficult to optimize sensing performance. To address the aforementioned shortcomings, this study proposes highly tunable metallic silver copper micro-nano structures adapted on cotton fabric (AgCu/cotton) to adjust the interfacial contact sites and optimize the sensing properties. The shape, size, and distribution of the metallic AgCu nano structures are precisely regulated, and various distinctive morphologies including two-dimensional (2D) nanosheet stacking, three-dimensional (3D) irregular protrusions, and nanoparticle aggregation were obtained. Specifically, the 3D irregular protrusions of varying heights and shapes (nanosheets, nanoparticles, and so on), encouraging multiple deformations and enhanced interfacial contact sites. On the other hand, the hierarchical porous structure of cotton fabric enhances structural compressibility. Collectively, the synergistic results of the 3D irregular protrusions and the hierarchical porous structure allow for a high sensitivity (115.65 kPa −1 ), a quick response time (500 ms), and outstanding stability (2000 cycles). The above sensing properties enable the pressure sensor to be successfully applied in joint movement detection and swallowing recognition. The discovery could pave the way for a more cost-effective and widespread approach to a controlled and improved piezoresistive pressure sensor. Graphical abstract We herein develop a highly morphology-controlled AgCu/cotton flexible pressure sensor with an economical strategy toward superior sensing performance. Such regulated morphology is responsible for optimized contact sites and structural deformation, resulting in a high sensitivity of 115.65 kPa −1 over 2–7.5 kPa, and showing great potential in various human motion detections.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Tiantian Cao,Yan Zhou,Lili Wang,Jun Zhang,Bing Zhao
The conventional antimicrobial treatment process for cellulose based fabrics such as cotton fabrics faces significant challenges, including suboptimal durability of antimicrobial coatings and degraded mechanical properties of textiles after treatment. Herein, an antimicrobial adhesive of silver and copper composite nanoparticles (AgCuNPs) was prepared by simultaneous in-situ reduction of Ag + and Cu 2+ in the presence of waterborne polyurethane (WPU). The synthesized AgCuNP glue exhibited an average particle size as low as 2.1 nm, a zeta potential as high as −64.8 mV at the optimum mass ratio of WPU to AgCu of 9:1, and high adhesion strength to cellulose, which ensured good wash resistance of AgCuNPs. WPU was found to form a closed film on the surface of cotton fibers, thereby providing AgCuNPs with adequate adhesion strength. In addition, AgCuNP-coated cotton fabric as low as 100 mg/kg showed ~100 % antibacterial rates against Escherichia coli and Staphylococcus aureus after 50 washes, indicating excellent washability. Finally, the 100 mg/kg of coated cotton fabric showed good resistance to abrasion and sunlight exposure, good biocompatibility, and enhanced mechanical properties. The tensile strength and hydrophobicity of AgCuNP-coated cotton fabric were improved after treatment, probably because the penetration of WPU into the yarn improved fiber cohesion.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yingxue Sun,Shuai Liu,Huaiqiu Chang,Jianjun Liu,Lingyu Piao
The efficient conversion of methane (CH4) to high-value-added chemicals using a photocatalyst at room temperature and pressure faces great challenges compared to harsh reaction conditions. However, achieving this efficient conversion would yield substantial cost advantages and hold immense potential for development. Here, we demonstrate the enhanced photocatalytic conversion efficiency of CH4 at room temperature and pressure conditions without requiring any oxidant through the construction of a bimetal Ag–Cu-loaded brookite TiO2 photocatalyst. The C1 products were ultimately obtained with 100% selectivity and a yield of 936 μmol·g–1·h–1. The performance exceeds that of similar research by tens of times. The high selectivity of this system is attributed to the optimal number of ·OH, which strikes a balance between excess and deficiency. Ag effectively enhances electron transport in the photocatalytic reaction process on a dual active site photocatalyst, while Cu significantly improves the selectivity of the C1 products. In this system, the hydroxyl radical (·OH) activates CH4 to generate the methyl radical (·CH3), which then binds with the lattice oxygen of TiO2, breaking the Ti–O bond and resulting in the formation of *OCH3. The *OCH3 undergoes further conversion to CH3OH, which is subsequently oxidized to HCHO by ·OH. This work presents a cost-effective and highly efficient approach for directly oxidizing CH4 into valuable chemicals, ensuring superior selectivity.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 12
·2095-2104
·
IF 1.982
Qianqian Dou,Yang Li,Ka Wai Wong,Ka Ming Ng
Bimetallic nanoparticles (NPs) have attracted a great deal of attention due to the synergistic interaction between metal components. In this work, the thermal process in which the reducing agent is not expensive or hazardous as those in traditional methods was employed to prepare alloy Ag–Cu NPs. The molar ratio between Ag and Cu was varied from 1:9 to 9:1. Nearly monodisperse NPs with alloy structure were characterized by X-ray diffraction and high-resolution transmission electron microscopy with energy dispersive spectroscopy In comparison with monometallic Ag and Cu NPs, the alloyed Ag–Cu NPs showed better monodispersity, especially when the ratio between Ag and Cu was 1:1. Moreover, the alloyed Ag–Cu NPs exhibited enhanced resistance to electromigration and oxidation, the respective problem of pure Ag and Cu. The alloyed Ag–Cu NPs also exhibited improved properties than a mixture of Ag–Cu NPs. This study should serve as the foundation for exploring high performance alloyed bimetallic NPs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Jianchao Wang,Hongsheng Luo,Xuliang Song,Xihong Zu,Jie Zhang,Yuxin Gu,Guobin Yi
In this paper, a superhydrophobic Ag–Cu composite metal film was fabricated as surface-enhanced Raman scattering substrate. Ag–Cu composite metal film was prepared from galvanic displacement on commercial copper foil. The prepared silver films were modified by PFDT to create a stable superhydrophobic SERS platform. Superhydrophobic substrates were characterized by a variety of characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis, XPS and Raman spectra. The superhydrophobic substrate could enrich probing molecules with the volatilization of solvent. Mathematical model was presented and applied to investigate concentration factor of hydrophobic substrate. The measurements were in good agreement with the calculation results. The superhydrophobic Ag–Cu composite metal film can reduce the detection limits and provide a new way to prepare efficient SERS substrates for ultra-low concentration detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2021
·
IF 7.132
Danqing Shu,Miao Wang,Fengyu Tian,Honglei Zhang,Chuang Peng
Electroreduction of CO 2 to high value-added products such as hydrocarbons provides a promising way to create a carbon neutral circular economy. Copper (Cu) is the most effective metal catalyst with selectivity towards hydrocarbons but Cu catalyst alone generally produces hydrocarbons at low selectivity and yield. Operando surface enhanced infrared absorption spectroscopic (SEIRAS) analysis reveals that the low hydrocarbon yield is attributed to the poor ability of Cu to produce carbon monoxide (CO), which is a crucial intermediate for hydrocarbon formation. In the current study, an Ag-Cu dual-cathode CO 2 RR device is developed, which allows separate control of electrode potential. This dual-cathode cell shows increased hydrocarbon yield (83 % for methane and 106 % for ethylene) and a 200 mV lower onset potential for C 2 H 4 , compared to electrolysis with a single Cu cathode. The CO produced by the Ag cathode transfers to Cu and increase its CO coverage, facilitating methane formation as well as promoting C C coupling to form ethylene. This study also reveals a mismatch of optimum electrode potential between Ag and Cu, which results in compromised performance of the two components in an Ag-Cu bimetallic electrocatalyst, but poses no challenge in the dual-cathode cell. To optimize the performance of the dual-cathode cell, we propose the use of a single-pass dual-gas-diffusion-cathode reactor with enhanced mass transfer for maximum hydrocarbon production. This work verifies that splitting the complex CO 2 RR process into two separate steps is a feasible method to improve the overall efficiency and rate of advanced products while reducing the energy input.
研究领域:
能源化学
·
电催化
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-10
·
IF 5.479
Yang Jinlan,Song Naizhong,Jia Qiong
An electrostatically controlled fluorometric assay is described that is based on the use of silver/copper bimetallic nanoclusters. The nanoclusters were coated with polyethyleneimine (PEI-Ag/CuNCs). At pH 7.4, these particles are positively charged. Their blue fluorescence (with excitation/emission peaks at 341/464 nm) depends on local pH values and temperature. If graphene oxide (which is negatively charged at pH 7.4) is introduced, the fluorescence of the PEI-Ag/CuNCs is quenched. Based on various electrostatic interactions, three kinds of biomacromolecules were detected by fluorometry. These include (negatively charged) heparin, (positively charged) protamine, and (virtually uncharged) trypsin. Heparin is detected by using GO/PEI-Ag/CuNCs, protamine by using GO/heparin/PEI-Ag/CuNCs, and trypsin by using GO/protamine/heparin/PEI-Ag/CuNC. The detection limits and linear ranges are 4.8 nM and 10–450 nM for heparin, 0.09 μg·mL −1 and 0.25–5 μg·mL −1 for protamine, and 0.03 μg·mL −1 and 0.05–1 μg·mL −1 for trypsin. Zeta potentials of the various substances in the system were determined to elucidate the detection mechanism. Comceivably, the method provides a widely applicable approach for electrostatically controlled biomolecular assays.
Schematic presentation of electrostatically controlled fluorometric assay for the detection of heparin, protamine, and trypsin based on the silver/copper bimetallic nanoclusters modified with polyethyleneimine and graphene oxide.
研究领域:
生物化学
·
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Fang Zhou,Yan Zhu,Longlai Yang,De-Quan Yang,Edward Sacher
Aqueous dispersions of AgCu nanoparticles (NPs), with enhanced antibacterial efficacy, have been prepared through the catalyzed reduction of Cu ions by PVP/PVA-stabilized Ag nanoparticles at 85 °C. The effects of Cu concentration and heating time on NP morphology and antibacterial efficacy were investigated, using TEM, UV-Vis and FTIR spectroscopies , and antibacterial evaluations. The enhanced antibacterial performance of these NPs was correlated with Ag ion release. We propose a simple model of AgCu NP formation, and an enhanced antibacterial efficacy mechanism involving Ag ion release, in which AgCu NPs formation plays a role to control of Ag ion release.
研究领域:
材料科学
·
微生物学
·
纳米医学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Shuang Li,Te Wei,Mingyu Tang,Fang Chai,Fengyu Qu,Chungang Wang
Here, we reported on a route to the facile synthesis of bimetallic silver doped copper nanoparticles (Ag-Cu NPs) by AgNO 3 and CuSO 4 in the presence of sodium borohydride and sodium citrate. The present work described the preparation of the Ag-Cu NPs with sodium citrate and the use of them in colorimetric detection of mercury (II) ions. Ag-Cu NPs with an average diameter of 9.0 ± 0.8 nm were prepared via two step reduction at room temperature. The Ag-Cu NPs were thoroughly characterized by using UV–vis spectroscopy and transmission electron microscopy (TEM) techniques. The morphology and constitution of the Ag-Cu NPs were characterized by TEM, and the valence state of Ag-Cu NPs was confirmed by the X-ray photoelectron spectroscopic (XPS) result. The synthesized Ag-Cu NPs were yellow in color due to the intense surface plasmon absorption band centered at 406 nm. This high selective sensor allowed a direct quantitative assay of mercury ions (Hg 2+ ) with a detection limited of 0.51 nM. The synthesized Ag-Cu NPs also exhibited good catalytic activity in two model reactions, the reduction of the nitrophenols and potassium ferricyanide (III) by sodium borohydride.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3275-3283
·
IF 4.831
Yao Youzhi,Liu Yunchun,Yang Zhousheng
The authors describe a method for room temperature preparation of reduced graphene oxide (rGO) decorated with Ag-Cu nanoparticles (NPs). The nanocomposite (Ag-CuNP/rGO) was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. A glassy carbon electrode (GCE) modified with this nanocomposite dispersed is shown to be a viable electrode for determination of Sudan I (best at a working voltage of −112 mV vs. Ag/AgCl), with remarkably increased electrochemical response to Sudan I compared to that of a plain GCE. The calibration plot is linear in the 1.0 nM to 10 µM concentration range, with a 0.4 nM detection limit (at a signal-to-noise ratio of 3). The method was successfully applied to the determination of Sudan I in ketchup and chili powder.
The nanocomposite of reduced graphene oxide (rGO) decorated with Ag-Cu nanoparticles (Ag-CuNP/rGO) was prepared using NaBH 4 as a reductant at room temperature. A glassy carbon electrode (GCE) was coated with a Ag-CuNP/rGO nanocomposite to form a modified electrode that can detect trace concentrations of Sudan I.
研究领域:
分析化学
·
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaodan Jiang,Jiabao Guo,Yuhan Zhang,Hubao Zuo,Yuanqi Bao,Nian Liu,Mingna Guo,Ronghai Wu,Qiang Chen
Porous architecture of titanium implants offers significant advantages in promoting osseointegration and mitigating the “stress shielding” effect. However, challenges remain in enhancing vascularization and preventing infection, especially given the complexities of modifying the intricate surface structure of porous titanium (PT). This study introduces a novel surface modification technique of PT using anti-gravity perfusion electrophoretic deposition (EPD) technique to fabricate antibacterial coatings containing silver (Ag) and copper (Cu) co-doped mesoporous silica nanoparticles (Ag-Cu@MSN) and chitosan binder on the surface of PT. The developed coating exhibits rapid and stable photothermal response to 808 nm near-infrared (NIR) light, leading to a localized temperature rise and triggered release of Ag and Cu ions for synergistic bactericidal efficacy against both E. coli and S. aureus . In vitro studies further demonstrated that the coated PT significantly promoted the proliferation of mouse calvaria pre-osteoblast (MC3T3-E1) and human umbilical vein endothelial cells (HUVECs), with a notable increase in HUVECs migration and angiogenesis, attributable to the presence of Cu ions. This innovative EPD-based coating strategy offers a promising avenue for developing uniform, photothermally-activated antibacterial surfaces on PT implants, with substantial implications for advancing clinical bone repair applications.
研究领域:
生物医学工程
·
材料科学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）