Analytical Methods
·
2023
·Vol. 15
·期 44
·6088-6096
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IF 3.1
Pei Zeng,Huan Zhang,Qi Guan,Qianqian Zhang,Xianzai Yan,Lili Yu,Luying Duan,Chunrong Wang
The design and preparation of various effective three-dimensional (3D) silver nanostructures is a frontier area of research in the field of surface-enhanced Raman scattering (SERS). This paper demonstrates a simple and novel method for the preparation of a substrate, whose surface was covered by a 3D interconnected network of Ag nanostructures, and the resulting network structure surface is free of organic contaminants. The EDS measurements confirm the metallic nature of the formed 3D Ag nanonetwork substrate. Additionally, the influence of experimental parameters on the morphology of the 3D Ag nanonetwork was also investigated, such as reaction time, hydrofluoric acid concentration, silver nitrate concentration and sodium citrate concentration. The 3D Ag nanonetwork has good uniformity. Importantly, the 3D Ag nanonetwork substrate was used to accurately and reliably detect amaranth (AR) and sunset yellow (SY) in beverages, with the lowest detection limit of 3 and 0.1 μg L−1, respectively. Therefore, this substrate is expected to be a promising candidate for SERS detection and offers attractive potential for a wider range of applications.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xinke Wang,Xue-xia Jia,Yonghui Wang,Shuang Li,Shuyue Ren,Yu Wang,Dianpeng Han,Kang Qin,Xueyu Chang,Huanying Zhou,Zhixian Gao
Ochratoxin A (OTA) is a potent carcinogen, and is among the most dangerous mycotoxins in agricultural products. In this study, an ultrasensitive dual-mode immunosensor was developed for naked-eye and fluorescence detection of OTA based on Ag-doped core–shell nanohybrids (Ag@CSNH). Complete antigen-labeled Ag@CSNH (CA-Ag@CSNH) were used as a competitive bind and dual-mode probe. The diffused doping structure of CA-Ag@CSNH provided improved stability, color and fluorescence quencher performance. Antibodies modified magnetic beads were used as a capture probe. The competitive binding between OTA and CA-Ag@CSNH produced both color change and fluorescence quenching. Ultraviolet and fluorescence intensitie correlated linearly with OTA concentration ranges of 0.03–3 ng/mL and 10–10000 pg/mL, and limits of detection of 0.0235 ng/mL and 0.9921 pg/mL, respectively. The practical applicability of proposed strategy was demonstrated by analysis of OTA in spiked corn, soybean and flour samples. This study offers a new insight on multi-mode platforms for various applications.
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Materials Today Physics
·
2023
·
IF 11.5
Xinyu Wang,Qingbo Xu,Jingchao Wang,Peng Wang,Yanyan Zhang
Cracking of conductive coatings is a primary cause of the poor durability of conductive fabrics. To address this, an Ag/MXene colloidal solution was prepared, which was stable owing to the evenly dispersed Ag particles on the MXene sheet structure. A cotton fabric sample was then coated with Ag/MXene using a dipping method, which resulted in excellent electrical conductivity. Finally, the Ag/MXene conductive coating on the polydimethylsiloxane (PDMS)-covered fabric significantly improved the conductive durability of the fabric. The finished cotton fabric exhibited excellent conductive properties, with a surface resistance of 13.9 ± 0.3 Ω/sq. In addition, the finished cotton fabric exhibited excellent mechanical durability against bending, folding, and strain. Therefore, finished cotton fabrics with excellent electrical conductivity and durability have great potential for application in wearable textiles and flexible sensors.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Zeyu Zheng,Hui Xu,Jialin Wen,JiFeng Chen,Zhu Mao,Pengli Zhu,Rong Sun,Weijing Wu,Junbiao Peng
To meet the higher requirements posed by high-power chips on packaging materials, designing and fabricating a multi-functional integrated composite is an effective solution. In this work, the diamond/Ag hybrid filler was prepared (in-suit growth) using the “Ball milling-Heating” approach in the absence of any solvent or external force. Furthermore, the nano-micro hybrid filler was combined with the inherently high thermal conductivity liquid crystal epoxy resin to create composites through a hot-press curing. In this process, there is a synergistic interaction between fillers and matrix and Ag nanoparticles serve as bridging elements in nano-scale. Ultimately, the hybrid filler with a nano-microstructure effectively constructs “phonon-electronic-phonon” pathways in the liquid crystal epoxy matrix . When the hybrid filler content reached 80 wt%, the composites demonstrated a range of integrated advantages including high thermal conductivity (4.65 W/m·K), low coefficient of thermal expansion (CTE), high volume resistivity, and excellent thermal stability. The era of high-power devices is approaching, and this study offers a novel perspective on the application of epoxy-based composite materials in the realm of advanced packaging.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Mohammad Sherjeel Javed Khan,Lariyah Mohd Sidek,Tahseen Kamal,Abdullah M. Asiri,Sher Bahadar Khan,Hidayah Basri,Mohd Hafiz Zawawi,Ali Najah Ahmed
This work reports silver nanoparticles (AgNPs) supported on biopolymer carboxymethyl cellulose beads (Ag-CMC) serves as an efficient catalyst in the reduction process of p-nitrophenol (p-NP) and methyl orange (MO). For Ag-CMC synthesis, first CMC beads were prepared by crosslinking the CMC solution in aluminium nitrate solution and then the CMC beads were introduced into AgNO 3 solution to adsorb Ag ions. Field emission scanning electron microscopy (FE-SEM) analysis suggests the uniform distribution of Ag nanoparticles on the CMC beads. The X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis revealed the metallic and fcc planes of AgNPs, respectively, in the Ag-CMC catalyst. The Ag-CMC catalyst exhibits remarkable reduction activity for the p-NP and MO dyes with the highest rate constant ( k app ) of a chemical reaction is 0.519 and 0.697 min −1 , respectively. Comparative reduction studies of Ag-CMC with CMC, Fe-CMC and Co-CMC disclosed that Ag-CMC containing AgNPs is an important factore in reducing the organic pollutants like p-NP and MO dyes. During the recyclability tests, the Ag-CMC also maintained high reduction activity, which suggests that CMC protects the AgNPs from leaching during dye reduction reactions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhen-Fei Tian,Jing-Xuan Pei,Xiang Yu,Yi-Bo Sun,Lei Yang
4-Aminothiophenol (4-ATP, a toxic pesticide intermediate) residues in waste water endanger water ecology and human health. Therefore, the development of reliable surface-enhanced Raman scattering (SERS) substrate is a promising strategy for monitoring and preventing 4-ATP pollution. In this work, a core-shell structured Ag@ZnS hybrid, consisting of Ag nano-core and ZnS nano-shell, was fabricated and employed as a SERS substrate to detect 4-ATP. Owing to the specific core-shell structure, epy as-prepared Ag@ZnS substrate is stable against oxidation and spontaneous agglomeration of Ag NPs, enjoying good stability and uniform hot spots. Moreover, the formation of heterostructure between Ag-core and ZnS-shell offered a remarkable chemical enhancement for the Raman signals. The optimized Ag@ZnS substrate showed high sensitivity for rhodamine 6 G (R6G, 10 −9 M) and methylene blue (10 −8 M) probes, as well as 4-ATP (10 −8 M) target analyte. Likewise, the superior reproducibility (RSD<5.50 %, n = 16) and good stability (79.5 % of initial strength after 28 days) for 4-ATP makes this substrate a good candidate for actual determination of trace 4-ATP. This work proposes a strategy to fabricate a reliable SERS substrate with high sensitivity and superior reproducibility, and the designed Ag@ZnS substrate may be applicable to monitor 4-ATP residues in wastewater.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jiayang He,Shihua Luo,Huilin Deng,Chunli Yang,Yuqing Zhang,Mengdie Li,Ruo Yuan,Wenju Xu
The DNA frame structure as a natural shell to stably shield the sequence-templated Ag nanocluster core (csAgNC) is intriguing yet challenging for applicable fluorescence biosensing, for which the elaborate programming of a cluster scaffold inside a DNA-based cage to guide csAgNC nucleation might be crucial. Herein, we report the first design of a symmetric tetrahedral DNA nanocage (TDC) that was self-assembled in a one-pot process using a C-rich csAgNC template strand and four single strands. Inside the as-constructed soft TDC architecture, the template sequence was logically bridged from one side to another, not in the same face, thereby guiding the in situ synthesis of emissive csAgNC. Because of the strong electron-repulsive capability of the negatively charged TDC, the as-formed csAgNC displayed significantly improved fluorescence stability and superb spectral behavior. By incorporating the recognizable modules of targeted microRNAs (miRNAs) in one vertex of the TDC, an updated TDC (uTDC) biosensing platform was established via the photoinduced electron transfer effect between the emissive csAgNC reporter and hemin/G-quadruplex (hG4) conjugate. Because of the target-interrupted csAgNC switching in three states with the spatial proximity and separation to hG4, an “on–off–on” fluorescing signal response was executed, thus achieving a wide linear range to miRNAs and a limit of detection down to picomoles. Without complicated chemical modifications, this simpler and more cost-effective strategy offered accurate cell imaging of miRNAs, further suggesting possible therapeutic applications.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yong Han,Lihui Yin,Zhong Lu,Nan Jiang,Huaiying Yao
With the rapid development of nanotechnology, nanomaterials have been prepared with diverse sizes and surface properties. However, the influences of these properties on the horizontal transfer of antibiotic resistance genes (ARGs) are still unclear. Here, two groups of Ag particles were prepared, one group with the same negative charge and different sizes (9, 72 and 1885 nm), the other group with similar sizes (72 and 67 nm) and different charges (−12.7 and +22.6 mV) and their effects on ARGs transformation were investigated. The results revealed that 9 nm Ag at 1000 μg/L induced a 14.56-fold increase in transformation, which was 2.05 and 3.91 times higher than that of 72 nm and 1885 nm Ag particles, respectively. When the size was similar, the positively charged Ag stimulated an 11.59-fold increase in transformation, which is 1.63-fold higher than that of the negatively charged Ag. Investigation of the underlying mechanisms suggested that Ag particles with a smaller size and/or positive charge induced more intercellular reactive oxygen generation and membrane damage than Ag particles with large size and/or negative charge. This study exposed the potential ecological risks of Ag particles with small size and positive charge in accelerating the dissemination of ARGs and highlighted concerns about the management of nanomaterials with varying structural properties.
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Environmental Science-Nano
·
2023
·Vol. 10
·期 11
·3072-3083
·
IF 7.3
Chuanqi Pan,Biluan Zhang,Tingyu Pan,Hui Huang,Siyi Song,Xitong Cai,Yuhang Wang,Hongwei Sun,Zhu Luo,Lizhi Zhang,Yanbing Guo
The dual activation mechanism of molecular oxygen (O2) and water (H2O) in the local structure of catalysts has not been elucidated yet. Herein, we report a strategy for manufacturing fully exposed Ag4 sites in nano silver/graphdiyne (Ag/GDY) composites for activating O2 and H2O. The synthesized nano Ag was uniformly anchored on the surface of GDY without any surfactant added, with an average particle size of 2.5 nm. The unique sp-hybrid C and triangular pore structure of GDY not only regulate the stable geometric structure of nano Ag, but also enhance the adsorption ability of Ag4 sites for O2 and H2O molecules in nano Ag/GDY. Electron spin resonance spectroscopy and density functional theory calculation results proved that O2 is more favorable to synergistically promote the activation of H2O to generate reactive ·O2− and ·OH radicals on the nano Ag/GDY surfaces, leading to outstanding antibacterial activity. This work provides a simple strategy for the preparation of stable nano Ag and proposes to improve the catalytic oxidation activity by adjusting the local electronic structure of catalysts to activate O2 and H2O.
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SENSORS
·
2021
·Vol. 21
·期 4
·1220
·
IF 3.576
Yangguang Zhu,Xiufen Li,Yuting Xu,Lidong Wu,Aimin Yu,Guosong Lai,Qiuping Wei,Hai Chi,Nan Jiang,Li Fu,Chen Ye,Cheng-Te Lin
Chloramphenicol (CAP) is a harmful compound associated with human hematopathy and neuritis, which was widely used as a broad-spectrum antibacterial agent in agriculture and aquaculture. Therefore, it is significant to detect CAP in aquatic environments. In this work, carbon nanotubes/silver nanowires (CNTs/AgNWs) composite electrodes were fabricated as the CAP sensor. Distinguished from in situ growing or chemical bonding noble metal nanomaterials on carbon, this CNTs/AgNWs composite was formed by simple solution blending. It was demonstrated that CNTs and AgNWs both contributed to the redox reaction of CAP in dynamics, and AgNWs was beneficial in thermodynamics as well. The proposed electrochemical sensor displayed a low detection limit of up to 0.08 μM and broad linear range of 0.1–100 μM for CAP. In addition, the CNTs/AgNWs electrodes exhibited good performance characteristics of repeatability and reproducibility, and proved suitable for CAP analysis in real water samples.Keywords:chloramphenicol;carbon nanotubes;silver nanowires;electrochemical sensor;voltammetric detection
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Meng Zhang,Guohui Wang,Dong Wang,Yuqi Zheng,Yanxin Li,Wenqiao Meng,Xin Zhang,Feifan Du,Shaoxiang Lee
In this paper, Ag-Metal−organic framework loaded chitosan nanoparticles (0.1%Ag@MOF/1.5%CSNPs) and polyvinyl alcohol/sodium alginate/chitosan (PACS) were used as the upper and lower layers to successfully prepare a bilayer composite dressing for wound healing. The performance of bilayer dressing was evaluated. The lower layer (PACS) had uniform pore size distribution , good water retention, swelling, water vapor permeability, and biocompatibility while PACS had almost no antibacterial activity . The upper layer (Ag@MOF/CSNPs) possessed excellent antibacterial activity and poor biocompatibility. As the upper layer, it can avoid direct contact with the skin and inhibit microbial invasion. In addition, the bilayer can adhere to a large number of red blood cells and platelets, promoting blood coagulation and cell proliferation . Ag@MOF, CSNPs, Ag@MOF/CSNPs and bilayer showed antibacterial activity in ascending order, due to the synergistic antibacterial action of the upper and lower layer. In vivo evaluation showed that both bilayer and PACS could significantly accelerate the wound healing, and the bilayer dressing showed more complete re-epithelialization with less inflammatory cells. In summary, this new bilayer composite is an ideal dressing for accelerating wound healing.
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Plasmonics
·
2021
·Vol. 17
·期 2
·597-612
·
IF 2.404
Li Jian-Jun,Qin Qiu-Xiang,Weng Guo-Jun,Zhu Jian,Zhao Jun-Wu
In this study, Au–Ag nanoboxes are converted into Au–Ag alloy nanocages by increasing the hole size. The extinction spectrum and the refractive index sensing characteristics of Au–Ag alloy nanocages with different geometric parameters are studied by using discrete dipole approximation method (DDA). With the increase of Au composition, the peak of local surface plasmon resonance (LSPR) shows approximately linear redshift and the sensitivity factor shows approximately linear decrease. The refractive index sensitivity can be effectively controlled by the Au–Ag ratio at large hole size because the hole and cavity surfaces distribute more environmental dielectric components. Therefore, increasing the hole size and decreasing the Au–Ag ratio can improve the refractive index sensitivity. These calculation results have also been verified experimentally. In order to illustrate the influence of alloy composition on the LSPR characteristics and the refractive index sensitivity, the local electric field distributions under different geometric parameters are plotted. We find that the electric field direction on the hole and cavity surfaces is controlled by the Au–Ag ratio and environmental dielectric constant. Moreover, the field vectors on the hole and cavity surfaces are formed by the superposition of the incident field, the electric field generated by the oscillating electrons on the outer surface, and the polarized field in the environmental dielectric constant.
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