International Journal of Electrochemical Science
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2024
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IF 1.3
Yuanli Zhang,Meilan Sun
A highly responsive and specific electrochemical biosensor utilizing Ag-Au bimetallic nanoparticles was engineered for the measurement of B-type natriuretic peptide (BNP), serving as an indicator for heart failure. The sensor was fabricated by modifying a glassy carbon electrode with Ag-Au bimetallic nanoparticles (average diameter: 20 ± 3 nm) and immobilizing anti-BNP antibodies. The sensor exhibited a wide linear range (0.0001–100 ng/mL), low limit of detection (0.03 pg/mL), and excellent specificity towards BNP, with minimal interference from other proteins (< 5 %). The practicality of the sensor was demonstrated by analyzing spiked serum samples, with recoveries ranging from 96.4 % to 103.5 % and relative standard deviations less than 4.5 %. The superior analytical property of the sensor is due to the synergistic effect of Ag and Au in enhancing electron transfer and antigen-antibody binding. The suggested biosensor holds significant promise for the early detection and monitoring of heart failure in medical environments.
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Catalysis Science & Technology
·
2024
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IF 4.4
Huangdong Wang,Zhihua Guo,Heng Zhang,Lin Jia,Min Sun,Lifeng Han,Haorun Li,Yan Guo,Shanghong Zeng
Arranging the active ingredients on the support surface at the molecular or atomic scale to create high-selectivity sites for the electrocatalytic CO2 reduction reaction (CO2RR) holds great promise, which is highly challenging. In this study, we report a strategy for constructing a bimetallic Ag–Ni electrocatalyst with Ni nanoparticles for H2O dissociation, as well as Ni atoms in the carbon skeleton and Ag nanoparticles on the surface for the CO2RR. These sites synergistically enable high selectivity for improving the conversion of CO2 to CO. Specifically, the FECO reaches 99.3% on Ag–Ni/CB at −0.8 V vs. RHE, and its FECO can be maintained over 95.8% in the potential range from −0.8 to −1.1 V vs. RHE. Our research presents an approach for alignment of bifunctional two-component active sites on the surface of a carbon support.
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Analytical Methods
·
2025
·
IF 2.6
Jinran Chen,Xiurui Ke,Zhou Zhou,Wenqi Ye,Hong Liu,Wei Zhang,Xiaohong Liu
We report the fabrication of a substrate with cavity-nanorods and decorated with Ag-nanoplates (C-NR@Ag). The cavities on the substrate are formed by metal assistant chemical etching, and the Ag-nanoplates in the cavities by galvanic cell deposition enhance the SERS performance effectively. Analytes in solution are adsorbed on Ag-nanoplates and located in hot spots, which enhance the SERS performance effectively. The enhancement factor of the Ag-nanoplates decorated on nanorod cavities is calculated to be 3.6 × 106, which is about 3 fold higher than that on the nanorods. The C-NR@Ag substrate is able to detect polychlorinated biphenyls (PCBs) with the lower limit of detection at 1.0 × 10−12 M. Additionally, due to the semi-volatile nature of PCB-77, the lower limit of detection of the C-NR@Ag substrate for PCB-77 was 1.0 × 10−11 M by the non-contact collection method. These results present a novel approach towards enhancing SERS performance and facilitating the rapid detection of PCB-77.
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MATERIALS CHARACTERIZATION
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2024
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IF 4.8
Kaifeng Wang,Jiayue Wen,Jiayun Feng,Yiping Wang,Peng Wu,Shang Wang,Yanhong Tian
The emergence of Cu@Ag core-shell nanoparticles presents a promising solution to address issues such as copper oxidation, the high cost of silver, and electro-chemical migration in high-power electronic devices, showcasing their potential for practical applications. In this study, Cu@Ag nanoparticles were synthesized via a liquid-phase reduction method, resulting in an average size of 30 nm. A low-boiling-point mixed organic solvent was meticulously prepared following Raoult's law, enabling the creation of a nano paste utilizing Cu@Ag nanoparticles. This innovation facilitated the sintering of fully dense joints under ambient air conditions, effectively mitigating the oxidation issue caused by silver dewetting behavior in Cu@Ag core-shell nanoparticles. Subsequently, the shear strength and microstructure of the joints were comprehensively studied under various sintering temperatures and durations. Notably, the joint exhibited a shear strength of 17.3 MPa when sintered at 250 °C for 30 min, while achieving full density at a sintering temperature of 300 °C for 30 min. These findings underscore the capacity of Cu@Ag core-shell nano paste to enable the production of high-performance joints under air conditions, utilizing thoughtfully selected organic components.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yang Li,Wanping Dang,Weirui Tang,Xingyu Chen,Jingjing Zhang
In this study, a novel imprinted electrochemical sensor was constructed by modifying deoxyribonucleic acid (DNA) for the detection of Ag + with high sensitivity and selectivity. Chitosan (CS) and Ag + template ions were mixed and used to modify a glassy carbon electrode, forming a composite CS-Ag + film. After CS-Ag + film crosslinking, gold nanoparticles (AuNPs) electrodeposition, and removal of Ag + templates, the imprinted sensor was prepared. A novel DNA-imprinted sensor was prepared by immobilizing Ag + DNA aptamers on the surface of AuNPs. The electroactive area, surface morphology and electrochemical reaction mechanism of the DNA-imprinted sensor were analyzed. The basic steps of the reaction were studied through electrochemical reaction kinetics analysis. The experimental results show that the DNA-imprinted electrochemical biosensor can quantitatively detect Ag + in the range of 10–50 nM (R 2 = 0.99695) with a limit of detection (LOD) of 8.25 nM (3σ/slope). The sensitivity of the electrochemical biosensor was 1.7473 × 10 −6 A/μM, and the effective area was 8.2121 cm 2 . The proposed novel DNA-imprinted sensor for detecting Ag + has high sensitivity and selectivity.
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APPLIED CLAY SCIENCE
·
2024
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IF 5.3
Hao Zhang,Chaopeng Fu,Jianhao Ding,Guoqiang Xu,Chunhui Zhou,Zhenyu He,Zhimin Ou,Dongshen Tong,Minyang Qiu,Xiangdong Zhou,Xiaonian Li
An electrostatic adsorption-based, surface-enhanced Raman scattering (SERS) assay for the detection of charged analytes was developed, which utilized Ag-deposited laponite nanoparticles (Ag@Lap NPs) as both a SERS substrate and negatively charged absorber for the capture of positively charged analytes, such as methylene blue (MB) and rhodamine B (RB). The strong electrostatic interaction between the MB analyte and the Ag@Lap NPs resulted in an effective concentration of MB on the Ag content of Ag@Lap and provided a limit of detection (LOD) sensitivity of 10 −11 M, which was more sensitive by a factor of 25,000 over the LOD of MB (0.25 × 10 −6 M) in a similar SERS assay using bare Ag NPs with low charges. Additionally, a 100-fold improvement in LOD was also observed for RB analyte on Ag@Lap NPs over that on bare Ag NPs. Unlike positively charged, the negatively charged analytes, such as direct black-168 (DB-168) and methyl orange (MO), exhibited a weaker adsorption on the same negatively charged surface of Ag@Lap NPs due to electrostatic repulsion, leading to a lower SERS sensitivity. These results indicated that the electrostatic attraction between the analytes and SERS substrate played an important role in enriching the number of analytes on the active substrate to significantly improve the SERS intensity, suggesting a new strategy, which could be easily adapted to environmental analysis and biosensor applications by concentrating and detecting charged analytes, such as pollutants and dye molecules in nanotags.
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Surfaces and Interfaces
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2025
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IF 6.3
Jiaqi Li,Ziming Shang,Ying Meng,Qianrui Lv,Fubo Luan
TiO 2 -based photocatalytic nitrate reduction is highly efficient for nitrate treatment. However, TiO 2 powders present challenges in recovery and reuse, necessitating immobilization to enhance recyclability. Additionally, existing research primarily focuses on the role of photogenerated electrons in nitrate removal, neglecting the impact of simultaneously generated free radicals on the reaction. To investigate the synergistic effects of electrons and free radicals in recyclable photocatalytic nitrate reduction, this study layered TiO 2 with specific crystal facets and a silver coating on a recyclable plane. Results indicate that hydroxyl radicals (·OH) can reoxidize ammonia nitrogen, inhibiting the interfacial reduction process and adversely affecting nitrate removal. Exposing the reductive (101) crystal facet and depositing silver nanoparticles helps promote electron migration to the nanoparticle surface for participation in the reduction process, while reducing free radical formation. This approach increases the nitrate degradation rate by 2.38 times compared to TiO 2 with the exposed (001) crystal facet. In contrast, the photocatalytic reduction efficiency of TiO 2 with exposed oxidative (001) crystal facet is reduced due to increased free radical formation influenced by surface positive charges. This study provides a cost-effective and reusable solution for nitrate removal in water, enhancing its potential in practical water treatment applications.
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Materials
·
2024
·Vol. 17
·期 2
·509
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IF 3.1
Shuya Ning,Shuo Wang,Zhihui Liu,Naming Zhang,Bin Yang,Fanghui Zhang
Magnetic–plasmonic nanoparticles (NPs) have attracted great interest in many fields because they can exhibit more physical and chemical properties than individual magnetic or plasmonic NPs. In this work, we synthesized Au- or Ag-decorated Fe3O4nanoparticles coated with PEI (Fe3O4-PEI-M (M = Au or Ag) NPs) using a simple method. The influences of the plasmonic metal NPs’ (Au or Ag) coating density on the magnetic and plasmonic properties of the Fe3O4-PEI-M (M = Au or Ag) NPs were investigated, and the density of the plasmonic metal NPs coated on the Fe3O4NPs surfaces could be adjusted by controlling the polyethyleneimine (PEI) concentration. It showed that the Fe3O4-PEI-M (M = Au or Ag) NPs exhibited both magnetic and plasmonic properties. When the PEI concentration increased from 5 to 35 mg/mL, the coating density of the Au or Ag NPs on the Fe3O4NPs surfaces increased, the corresponding magnetic intensity became weaker, and the plasmonic intensity was stronger. At the same time, the plasmonic resonance peak of the Fe3O4-PEI-M (M = Au or Ag) NPs was red shifted. Therefore, there was an optimal coverage of the plasmonic metal NPs on the Fe3O4NPs surfaces to balance the magnetic and plasmonic properties when the PEI concentration was between 15 and 25 mg/mL. This result can guide the application of the Fe3O4-M (M = Au or Ag) NPs in the biomedical field.
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Materials Today Communications
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2024
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IF 3.7
Guoan Zeng,Shichao Liao,Jinkun Liu,Yan Zhu,Toshiki Miyazaki
The germ-killing functions of silver and copper nanoparticles (NPs) were worthy of biomedical applications, but as heavy metals, NPs need to be more antimicrobial at lower doses to minimize hazards to human health, which requires more explorations on the new structures resulting from the compositing between two metals. In this study, self-assembled Cu-Ag bimetallic NPs were synthesized using a two-step reduction method. Results showed that both the Cu and Ag in Cu-Ag NPs existed as pure phases, the nanoparticles comprised ∼5 nm primary particles that self-assembled into ∼50 nm secondary particles surrounded with carbon-chain coatings. The larger secondary particles provided Cu-Ag with good particle dispersibility and chemical stability against deeper oxidation above ∼360 °C, while the smaller primary particles facilitated their suspensions in achieving a maximum inhibition ring of 10.01±0.25 mm and a minimum optical density (OD) of 0.11±0.01. Cu-Ag NPs demonstrated superior antimicrobial performance against all target strains, exhibiting synergistic enhancement through released active ions and reactive oxygen species (ROS). Cell viability ranged from 74.4 % to 95.4 % after co-culturing for 24 h, confirming that all synthesized nanometals were non-toxic to L929 cells at most concentrations. Increasing the suspension concentration enhanced antimicrobial activity while reducing cell viability. This conflict established an optimal Cu/Ag ratio of 10:4 and a concentration of 4 μg/mL, allowing Cu-Ag NPs to perform both broad-spectrum bactericidal activity and cell safety.
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Molecular Catalysis
·
2024
·
IF 3.9
Linyu Zhang,Yue Li,Chengyao Liang,Yongli Xiao,YuXin Gong,Jie Deng,Yongdong Chen
The deep oxidation of methanol at relative low temperature is of importance for the exhaust purification of methanol-fueled vehicle. Adjusting the metal-support interaction of catalysts is a promising approach to make the combustion of methanol efficiently. The exposed crystal facets of support strongly affect metal-support interaction as well as catalytic performance. Herein, three types of Ce 0.90 In 0.10 O δ nanomaterial with different morphologies (nanorods, nanoparticles , and nanocubes) and uniform Ag nanoparticles were synthesized, and then they were assembled to form Ag/Ce 0.90 In 0.10 O δ catalysts. The Ag/Ce 0.90 In 0.10 O δ -NR showed the best catalytic performance with a T 90 of 149 °C. To explore the mechanism behind the distinct catalytic performance, the supports and catalysts were characterized by XRD, Raman, H 2 -TPR, and XPS. The characterization results confirmed that Ag/Ce 0.90 In 0.10 O δ -NR exhibited higher oxygen vacancy concentration and more reactive Ag 0 species, which were attributed to that Ce 0.90 In 0.10 O δ -NR mainly exposed (110) crystal faces. Specifically, (110) crystal faces possess of the lowest oxygen vacancy formation energy and boost the charge transfer between Ag nanoparticles and support, which converts the Ag + into reactive species Ag 0 . Finally, the cyclicity and stability of the catalysts were tested. After four cycles and 50 h of continuous testing, the catalytic activity of Ag/Ce 0.90 In 0.10 O δ -NR remained basically unchanged, indicating good stability of the catalyst.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Aili Niyazi,Chaoqun Mu,Ting Wang,Wangsheng Ye,Lvling Zhong,Zhixian He,Haoyang Xu,Zhiqiang Zhang,Liang Zhang
In this work, temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) and the guanylthiourea (GLA) were used to modify chitosan (CS) to prepare a novel PNIPAM/GLA/CS adsorbent for Ag(I) ions. Temperature variations near the lower critical solution temperature (LCST) facilitate the adjustment of functional group distribution within the composite material, thereby influencing its adsorption performance for silver ions. The characteristics of this composite material were confirmed using a variety of techniques, including scanning electron microscopy (SEM), variable-temperature ultraviolet-visible near-infrared spectroscopy, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Studies on the adsorption of Ag(I) ions by the PNIPAM/GLA/CS adsorbent indicated that the optimal pH for adsorption is 6.0. The adsorption kinetics were best described by the pseudo-second order kinetic model, while the equilibrium adsorption data aligned more closely with the Langmuir adsorption isotherm model, achieving a maximum adsorption capacity of 336.33 mg/g at 40°C. Experimental results demonstrated that higher adsorption amounts were observed above the LCST, while desorption of target ions was more favorable below the LCST. This research provides valuable insights for the design of new structural adsorbents.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
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IF 6.3
Minghan Yu,Jiayun Feng,SenPei Xie,Yiping Wang,Yongsheng Li,Runze Wang,Guofeng Lu,Kang Li,Rui Wu,Weiwei Zhao,Yanhong Tian
This paper introduces a method to synthesize thick-shell Cu@Ag particles, with nanorod-shape silver wrapped on the copper surface after substitution and reduction reactions. The average size of silver nanorods is less than 50 nm and that of the copper particles is about 1 μm. The surface morphology, structure, and sintering properties of Cu@Ag particles were characterized in detail. The results show that the sintering temperature of thick-shell Cu@Ag is 127.5 °C, which is lower than that of Cu@Ag particles covered with island-shape and block-shape silver nanoparticles. The conductive ink was prepared by mixing it with resin paste, and the bulk conductivity of the conductive paste under different sintering conditions was investigated. The optimal -process parameters were chosen to conduct the printing of radio frequency identification (RFID) antennas. The farthest reading distances achieved by the ultra-high frequency RFID (UHF RFID) and the high-frequency RFID (HF RFID) were 9.4 m and 3.5 cm, respectively, which have good prospect of practical application.
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