MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Luo lixia,Ye ying,Wang hong,Liu zhe,Li Jiqian
A cholesteric chiral artificial receptor L5 was synthesized, which recognized and cooperated with Ag + in metal ions, and a rapid method for detecting Ag + was established in food. It was found by fluorescence spectroscopy analysis that the L5 could recognize Ag + in DMSO solution; with the help of fluorescence and UV titration, job test and interference test to verify its recognition pattern, and founded that the L5 and guest Ag + were combined with 1:1 coordination ratio. Then, the recognition mechanism between L5 and guest Ag + was explored by measures of nuclear magnetic titration, infrared spectroscopy, electron microscopy and computer molecular simulation. It was speculated that the carbonyl oxygen atom near the amide of the MeO-PhCONH group and the carbonyl oxygen atom of the –COOCH 3 group cooperated with Ag + throµgh electrostatic gravitational interaction. This method was used to establish the detection of Ag + in food in which the detection limit of L5 for Ag + was derived as 0.13 µmol/L, and the silver ions in wolfberry, milk powder,wheat flour, tea leaf and soybean were accurately detected. This method can be used to quantify Ag + content in actual samples accurately and efficiently.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
YingTe Wang,RongRong Wu,YuanYuan Zhang,SiRong Cheng,Yong Zhang
N-doped carbon dots (N CDs) with green fluorescence is developed by the hydrothermal reaction with o-aminophenol and ethylenediamine as carbon and nitrogen sources, and the quantum yield (QY) is 38.4%. The N CDs are characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Ultraviolet-visible absorption spectroscopy (UV–vis) and fluorescence spectroscopy. The results show that N CDs have good fluorescence properties and stability, and the N CDs are further utilized as a sensor for Ag + via the static quenching effect (SQE) (λ ex =430 nm, λ em =510 nm). The linear range of Ag + is 30–210 µmol/L with a limit of detection (LOD) of 4.7 µmol/L (S/ N = 3). On this basis, we quantitatively detect Ag + in real samples. Furthermore, due to the excellent fluorescence performance, the N CDs are found to be an effective tool for Ag + sensing in bioimaging.
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CHEMICAL PAPERS
·
2022
·Vol. 77
·期 4
·2115-2124
·
IF 2.146
Lin Yamei,Zhi Hongxin,Liu Shengkai,Chen Boyu,Fu Yujie,Liu Zhiguo
Proanthocyanidins-functionalized Fe 3 O 4 @ Ag nanoparticles (Fe 3 O 4 @ AgNPs) were synthesized by one-step hydrothermal method wherein silver nanocrystals were grown in situ on the surface of Fe 3 O 4 nanoparticles with the assistance of proanthocyanidins. The morphology and structure of Fe 3 O 4 @ AgNPs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier-transform infrared spectrometer (FTIR), UV–Vis spectrophotometer (UV–Vis), X-ray powder diffractometer (XRD), and physical property measurement system (PPMS). The characterization results indicated that sliver nanocrystals were deposited on the surface of Fe 3 O 4 nanoparticles to form spherical and uniformly dispersed Fe 3 O 4 @ AgNPs. Moreover, the Fe 3 O 4 @ AgNPs had a high magnetic response, which can be recovered from the environment. The antibacterial activity of the Fe 3 O 4 @ AgNPs against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ), and Candida albicans ( C. albicans ) was investigated. The results confirmed that the Fe 3 O 4 @ AgNPs had broad-spectrum antibacterial activity. At the same time, the adsorption property of the nanoparticles for heavy metal ions Cu 2+ , Pb 2+ , and Cd 2+ was also studied. The results showed that pH and incubation time played an essential role in the removal of heavy metal ions, and the nanoparticles had excellent removal efficiency. The multifunctional nanomaterial Fe 3 O 4 @ AgNPs prepared by this study have the potential to apply in the biomedical and water disinfection fields.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zhizhou Cai,Ning Cao,Fanxing Zhang,Xiangzhou Lv,Ke Wang,Yi He,Yao Shi,Hao Bin Wu,Pengfei Xie
Electrocatalytic CO 2 reduction into ethanol driven by renewable energy represents a promising strategy for energy storage and mitigation of global warming, but it has remained challenging to gain high activity and selectivity of ethanol. Here we take advantage of atomic arrangement in immiscible Ag-Cu composite during annealing and establish hierarchical interfaces in the obtained core-shell catalyst. The atomic Ag-Cu interactions increase electrochemical surface area and expedite charge dynamics, resulting in an unprecedented electrocatalytic performance with the faradaic efficiency of C 2+ products, ethanol as 80.2 %, 52.6 % and the current density of ∼320 mA cm −2 at −1.0 V (versus reversible hydrogen electrode). Moreover, the Ag-Cu catalyst exhibits a notable stability for ∼60 h. Mechanism studies reveal that local CO intermediates preferentially accumulate on the core, then migrate to the continuous Cu surface for C-C coupling energy-favorably toward ethanol. Our work highlights a novel design principle as interface engineering for advanced tandem electrocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 2
·1-10
·
IF 2.8
Zhang Zhen,Li Jinglong,Liu Tao,Tian Wenhuai,Li Zhipeng
Conducting films are becoming increasingly crucial for the electronics industry with applications in various technologies including high-power microelectronic packaging, photovoltaics, and flexible displays. The films with high conductivity were normally fabricated by sintering of printed inks with micrometer size particles. However, the resolution of printed pattern and high sintering temperature limit its application due to the particle size. Herein, we report a stable bimetallic alloy nanoparticle (Au–Ag) sintering inks with low sintering temperature (450 °C). The fabricated films have low resistivity (4.13 × 10 –8 Ω·m), which is similar with that of bulk Au films (2.4 × 10 –8 Ω·m) and show great adhesion on glass substrates. Film porosity is extremely low, with a maximum transmittance of only 0.1% in the wavelength range of 340 nm-870 nm. The Au–Ag nanoparticles sintering behavior was also characterized systematically by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was observed that the sintering process could be divided into three stages. This work indicates that this preparation approach of conductive film shows potential in the fabrication of highly integrated electronic devices by ink printing method.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Bo Li,Haocheng Yang,Hongli Song,Jie Zou,Chenchen Li,Ziyi Yan,Moyuan Qu,Wenqian Xiao,Songsong Zhu,Xiaoling Liao
Repairing bone defects is particularly challenging when an infection is presented. In this study, poly(L-lactic) (PLLA) nanofibrous microspheres (large microspheres) were used as cell carriers to simulate the nanofibrous structure of the extracellular matrix. A planet-satellite composite microsphere with large microspheres and small microspheres was constructed by bonding hollow Ag@SiO 2 nanospheres (small microspheres) to nanofibrous PLLA microspheres. According to the results, PLLA nanofibrous microspheres activated by EDC and NHS can firmly combine with Ag@SiO 2 nanospheres. The composite microspheres demonstrated excellent drug release functions, antibacterial properties, and biocompatibility and promoted cell adhesion and differentiation in vitro. The bone repair function of composite microspheres loaded with BMP2 growth factor was evaluated in rat that were infected with bacteria and exhibited skull defects. A four-week study showed that these microspheres significantly promoted bone regeneration in infected bone. These multifunctional microspheres could revolutionize bone repair and provide a much-needed solution for those suffering from infected bone defects.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·096514
·
IF 4.386
Zhijie Pan,Pengwei Huang,Yuanming Zhang,Xionghui Fu,Yi Zhu
Photoelectrocatalytic methanol oxidation to formaldehyde by using electric/solar energy is a promising technology. In this work, Ag nanoparticles were decorated on Mo-doped BiVO4 to synthesize Ag/Mo: BiVO4 catalyst. As expected, benefitting from Mo-dopant and plasmonic effect of Ag nanoparticles, formaldehyde production of Ag/Mo: BiVO4 photoanode was 2.2 times higher than pristine BiVO4 photoanode. Faradaic efficiency increased from 19% to 49% in comparison with the pure BiVO4 photoanode.
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Materials Today Communications
·
2022
·
IF 3.662
Chenghao Zhang,Chun Li,Mushi Zheng,Xiaoqing Si,Dejun Gao,Junlei Qi,Jian Cao
Ag nanoparticle paste was used to fabricate mechanically durable superhydrophobic surfaces via sintering. A facile method was first adopted to synthesize the Ag nanoparticle paste. To obtain multi-level hierarchical superhydrophobic surfaces, a stainless steel mesh was introduced to the sintering process of the Ag nanoparticle paste. The morphology of the steel mesh was replicated onto the Ag surface under sintering pressure, forming a first-level surface roughness . Using low-temperature sintering, a bond was created between the Ag nanoparticles, enhancing the mechanical durability of the as-prepared surfaces. The gap between the Ag nanoparticles was retained under low pressure, leading to a high surface roughness, which is beneficial for preparing superhydrophobic surfaces. After modification with stearic acid, the as-fabricated Ag coatings exhibited good superhydrophobicity, long-term durability, and mechanical stability. The superhydrophobic Ag coatings can also be fabricated on different substrates successfully. Thus, this type of superhydrophobic coating has promising prospects in practical applications.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Gaosheng Ren,Zhihui Su,Yu Tang,Weichen Du,Nan Xu,Chengyi Dai,Xiaoxun Ma
It is very important to design model catalysts to control the site distribution and develop methods to improve their electronic environment and thus promote the catalyst’s performance in the electrochemical reduction of CO 2 (CO 2 RR). In this work, a strategy of in-situ synthesis and anchoring of nanoparticles (SSAN) was developed. Using this strategy, a “jujube-cake” type catalyst was designed, referred to as Ag@4-MBA. In this catalyst, Ag nanoparticles (NPs) act as “jujube”, which are embedded in 4-mercaptobenzoic acid (4-MBA) acting as “cake”. A Pointer-shaped Ag@4-MBA material was prepared that achieved high loading of Ag species (∼24.0 wt%), high dispersion (5–10 nm), high CO mass activity (93.7 A g Ag −1 ), high CO faradaic efficiency (94.0%) and high CO production (2.0 mol g Ag −1 h −1 ), showing a superior performance to that of the recently reported Ag-based catalysts. Density functional theory (DFT) calculations and X-ray photoelectron spectroscopy (XPS) characterization showed that a high degree of electron delocalization of the Ag–S–aromatic ring and reconstructing the electronic environment of the metal sites were achievied, it is beneficial to stabilize the reaction intermediate COOH*. This work provides a new approach for the design of metal nanoparticle model catalysts with more sustainable CO 2 RR.
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Nanomaterials
·
2022
·Vol. 12
·期 17
·2967
·
IF 5.719
Xiaohan Wang,Fan Zhang,Feiyue Hu,Yaya Li,Yongqiang Chen,Hailong Wang,Zhiyu Min,Rui Zhang
To solve the pollution problem of electromagnetic waves, new electromagnetic shielding materials should meet the requirements of being lightweight with high electrical conductivity. In this work, the combination of silver (Ag) nanoparticles and nitrogen doping (N-doping) was expected to tune the electromagnetic and physical properties of Ti3C2TxMXene, and the Ag@N-Ti3C2Txcomposites were fabricated through the hydrothermal reactions. The nitrogen doped (N-doped) Ag@Ti3C2Txcomposites showed a hollow structure with a pore size of 5 μm. The influence of N-doped degrees on the electromagnetic interference (EMI) shielding performance was investigated over 8–18 GHz. Therefore, the controlled N-doping composites exhibited reflection-based EMI shielding performance due to the electrical conductivity and the special three-dimensional (3D) honeycomb-like structure. The achieved average EMI shielding values were 52.38 dB at the X-band and 72.72 dB at the Ku-band. Overall, the Ag@N-Ti3C2Txfoam, due to its special 3D honeycomb-like structure, not only meets the characteristics of light weight, but also exhibits ultra-high-efficiency EMI shielding performance, revealing great prospects in the application of electromagnetic wave shielding field.Keywords:nitrogen doping;Ag@N-Ti3C2Txcomposites;honeycomb-like structure;electromagnetic interference;multi-reflections
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PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2022
·
IF 3.369
Guojun Weng,Jianming Yang,Jianjun Li,Jian Zhu,Junwu Zhao
Bimetallic silver/gold nanostructures with high chemical stability and numerous “hot spots” have received much attention in surface-enhanced Raman scattering (SERS) application. In this work, silver/gold nanoplates were synthesized using a facile etching method based on silver triangular nanoplates (Ag TNPs) template. In the synthetic process, the morphology changes of the Ag/Au nanoplates clearly demonstrate the etching evolves with the increased dosage of HAuCl 4 solution. At the etching continued, the in-plane dipole resonance peak of the etched Ag TNPs exhibited a non-monotonic response: first red-shift and then blue-shift. What's more interesting is that the SERS activity of the etched Ag TNPs was sharply reduced at first, then gradually increased to a certain intensity, and maintained stability subsequently. The observed etching-dependent SERS activity was different with previous reports and the possible reason was discussed. The increased SERS activity of etched Ag TNPs was even higher than that of pure Ag TNPs when using the big Ag TNPs as the template. It is expected that the etching formed Ag/Au nanoplates are ideal candidates in applications related to SERS sensing.
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ELECTROANALYSIS
·
2022
·Vol. 35
·期 2
·e202200190
·
IF 3.077
Qi Zhang,Zhihui Guo,Xingwang Zheng
Polyethyleneimine (PEI) is a cationic polymer with a lot of amino groups in its molecular structure that is secure, sterile, and biocompatible. However, it is difficult for PEI molecules to be directly applied in electroanalysis due to their poor electroactivity. Herein, the PEI-based carbonized polymer nanodots (CPDs) with core-shell structure were prepared by hydrothermal method using PEI as the precursors. The results showed that the as-prepared PEI-based CPDs can not only exhibit the unique properties of carbon nanodots but also inherit the properties of PEI. Subsequently, based on the strong coordination interaction between the abundant amino groups on the surface of PEI and silver ions, the electroactive Ag@carbonized polymer dots (Ag@CPDs) were prepared. Furthermore, to investigate the electrochemical behaviors and application of Ag@CPDs, the DNA molecule (double-stranded and single-stranded DNA) was taken as an example. It was found that the interaction of DNA with Ag@CPDs had a significant influence on the current intensity of Ag@CPDs. Based on this phenomenon, a sensitive electrochemical technique for miRNA detection was established and effectively employed to detect miRNA in human serum samples based on the discriminating effect of Ag@CPDs towards ssDNA probes and ssDNA probe/miRNA complex (dsDNA).
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