APPLIED SURFACE SCIENCE
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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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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2022
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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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PROGRESS IN ORGANIC COATINGS
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2022
·
IF 6.206
Jiaye Li,Beibei Chen,Zhe Dong,Bi Yang,Shu Qiu,Hao Zhang,Shuang Wang,Kan Zhang
The application of epoxy (EP) self-lubricating composite coatings to the surface of mechanical parts has attracted attention increasingly, since they are beneficial for extending the lifetime of equipment by decreasing friction and wear. However, the shortcoming of poor wear resistance of EP is a limited factor in tribology . In the present study, the hard hexagonal boron nitride nanosheets (BNNSs) supported soft metal of Ag nanoparticles (Ag NPs) was constructed to strengthen the tribological performance of EP. The BNNSs was firstly prepared after h-BN being treated by NaOH/KOH solution, and then Ag NPs were uniformly anchored on the BNNSs surface through hydrothermal method . The achieved BNNSs/Ag surface had rough microstructure and active sites, which were conducive to the interfacial compatibility between BNNSs and EP. The tribological test results demonstrated that the lubricity and wear resistance of EP coating were improved significantly by BNNSs/Ag. Especially as the weight fraction of BNNSs/Ag was 0.7 %, the corresponding composite coating showed an 80.5 % and 86.4 % reduction in the friction coefficient and wear rate compared to EP coating, which was mainly because of the good interfacial interaction in the composite coating, the “hard-soft” synergistic reinforcing and lubricating effect of BNNSs/Ag, as well as self-lubricating property of transfer film. Furthermore, the tribological behaviors of BNNS/Ag/EP composite coating under pure water and oil lubrication were investigated comparatively. The enhancement mechanism of BNNSs/Ag was proposed by analyzing the worn surface of composite coatings and counterparts.
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MOLECULES
·
2022
·Vol. 27
·期 11
·3497
·
IF 4.927
Xi Li,Huiying Zheng,Jiehan Chen,Mengyuan Xu,Yan Bai,Tiantian Liu
Metal-organic frameworks (MOFs), which have become popular in recent years as excellent carriers of drugs and biomimetic materials, have provided new research ideas for fighting pathogenic bacterial infections. Although various antimicrobial metal ions can be added to MOFs with physical methods, such as impregnation, to inhibit bacterial multiplication, this is inefficient and has many problems, such as an uneven distribution of antimicrobial ions in the MOF and the need for the simultaneous addition of large doses of metal ions. Here, we report on the use of MIL-101(Fe)@Ag with efficient metal-ion release and strong antimicrobial efficiency for co-sterilization. Fe-based MIL-101(Fe) was synthesized, and then Ag+was uniformly introduced into the MOF by the substitution of Ag+for Fe3+. Scanning electron microscopy, powder X-ray diffraction (PXRD) Fourier transform infrared spectroscopy, and thermogravimetric analysis were used to investigate the synthesized MIL-101(Fe)@Ag. The characteristic peaks of MIL-101(Fe) and silver ions could be clearly seen in the PXRD pattern. Comparing the diffraction peaks of the simulated PXRD patterns clearly showed that MIL-101(Fe) was successfully constructed and silver ions were successfully loaded into MIL-101(Fe) to synthesize an MOF with a bimetallic structure, that is, the target product MIL-101(Fe)@Ag. The antibacterial mechanism of the MOF material was also investigated. MIL-101(Fe)@Ag exhibited low cytotoxicity, so it has potential applications in the biological field. Overall, MIL-101(Fe)@Ag is an easily fabricated structurally engineered nanocomposite with broad-spectrum bactericidal activity.Keywords:metal-organic framework;Ag nanoparticles;hybrid nanoagents;antibacterial activity
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Hongxu Zhang,Jing Ma,Chong Liu,Ling Li,Caina Xu,Yanwei Li,Yanhui Li,Huayu Tian
In this paper, the antibacterial 2D covalent organic framework (COF TGTp ) containing guanidyl cation was synthesized and used as a carrier to deposit AgNPs on N and O groups to form nanocomposites to avoid AgNPs aggregation and achieve excellent antibacterial effect. The Ag content in Ag/COF TGTp was 10.3% determined by ICP . TEM can clearly observe that AgNPs were uniformly dispersed in COF TGTp . Ag/COF TGTp was stable after being evenly dispersed in water with low cytotoxicity and hemolysis rate to erythrocytes. In bacteriostatic study, the minimum inhibitory concentration of Ag/COF TGTp for E. coli and S. aureus were 100 μg/mL and 50 μg/mL, respectively. Finally, the morphology of the bacteria was observed by SEM, confirmed the main sterilization by Ag/COF TGTp was destroying the cell wall of the bacteria.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Xiaoyu Bai,Wenyi Ma,Peng Liu,Qian Sun,Kai Zhang,Aixiang Li,Jian Pan,Zijian LYu
Efficiency and sustainability of catalytic thin-film nanocomposite (TFN) membranes are crucially important for the reverse-osmosis performance of thin film composite (TFC) membranes in many fields. Herein, Ag@UiO-66-NH 2 catalytic nanoparticles were fabricated and incorporated into the polyamide active layer through by covalent bond via the interfacial polymerization (IP) method. Polyamide TFN membranes with high efficiency, sustainable catalytic degradation of Rhodamine B (RhB), and excellent self-cleaning performance were prepared conveniently. The 0.8 wt % Ag@UiO-66-NH 2 composite membrane has excellent permeability stability, and the flux recovery rate can reach 81.6% after 7 runs. In addition, the degradation rate of RhB can reach 99.6% by using this membrane. More importantly, the degradation efficiency of 250 mL RhB solution can still reach 94.5% after 7 cycles of catalytic test. The degradation effect of RhB by the TFN membranes was enhanced significantly owing to the synergistic effect of the adsorption and catalytic properties of Ag@UiO-66-NH 2 nanoparticles. Moreover, it provides a universal method for preparing TFN membrane with a catalytic active layer, which can be applied in other fields of catalytic film by replacing Ag NPs with other particles.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yanzhi Xu,Changli Li,Yequan Xiao,Chenghui Wu,Yanming Li,Yanbo Li,Juguang Han,Qinghua Liu,Jingfu He
The combination of Cu and Ag presents a promising way to steer the CO2 reduction products through regulating the surface active sites. However, the difficulty in forming the CuAg alloy with a controllable atomic ratio impedes the in-depth understanding of the structure–activity relationship of CuAg catalysts. Herein, we use E-beam evaporation to synthesize a series of CuAg films with uniform distribution and controllable stoichiometry to reveal the real reaction mechanism on CuAg for the electrochemical CO2 reduction process. Compared with Cu, the Cu1–xAgx (x = 0.05–0.2) alloy showed an apparent suppression of HCOOH and the ratio between C2 liquid products (e.g., ethanol and acetate) and C1 liquid product (HCOOH) is also increased. Operando synchrotron radiation Fourier transform infrared spectroscopy results suggest that the introduction of Ag into the Cu phase can significantly strengthen the absorbed *CO and *OCCO intermediates and suppress the O–C–O intermediates. This research provides a reliable way to inhibit the generation of HCOOH and enhance the production of liquid C2 products during CO2RR and presents a guideline for the future manipulation of copper catalysts by alloying.
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Journal of Food Measurement and Characterization
·
2022
·Vol. 16
·期 2
·1448-1458
·
IF 3.006
Pu Hongbin,Xu Fang,Wei Qingyi,Paliwal Jitendra,Sun Da-Wen
Plasmonic Au–Ag core–shell nanorods (Au@Ag NRs) have drawn great attention and are widely used in surface-enhanced Raman scattering (SERS) due to their distinctive local surface plasmon resonance peculiarities. To optimize the thickness of the Ag shell, the electromagnetic field distribution of Au@Ag NRs was firstly simulated using the Radiofrequency module of COMSOL. Then, Au@Ag NRs with different shell thicknesses were prepared by coating different amounts of silver nitrate, and the Raman signal of the molecule of 4-mercaptobenzoic acid was measured to evaluate the SERS activity of the prepared Au@Ag NRs. The experimental results showed that the Au@Ag NRs with the shell thickness of 7.51 nm performed the best SERS effect. Finally, the optimized Au@Ag NRs were used to detect thiram solution and a low limit of detection of 0.003 mg/L was achieved, indicating that the optimized Au@Ag NRs might be a promising substrate for pesticide residues detection.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yinghua Li,Wenyue Yin,Mengxi Li,Jingwen Zhang,Lijun Chen
Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were synthesized by a simple co-precipitation and sono-chemical method, and their photocatalytic properties were investigated. The crystal structure, morphology, and elemental composition of the Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). Carrier migration and separation studied by Uv–vis DRS and PL spectroscopy. XPS showed that Ag monomers were successfully reduced out. The photocatalytic activity of the composites was investigated by simulating sunlight (full-spectrum xenon lamp irradiation) irradiation of levofloxacin hydrochloride. The results showed that the composite photocatalyst had the highest photocatalytic activity at pH 8 of the prepared system, pH 7 of the reaction solution and Ag + concentration of 0.1 mol/L (44.3 wt% loading), and still had good photocatalytic activity after five cycles. Compared with Bi 2 O 3 /BiFeO 3 and Ag/AgCl, Ag/AgCl/Bi 2 O 3 /BiFeO 3 exhibited better photocatalytic activity. In addition, based on the radical scavenging experiments and electron spin resonance analysis, ·O 2 - , h + and ∙OH were the reactive groups that played a role in the reaction system, and a possible catalytic mechanism of Ag/AgCl/Bi 2 O 3 /BiFeO 3 was proposed.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 14
·1-13
·
IF 2.8
Hou Enhui,Kong Zhiguo,Wu Jianfeng,Wang Hairui,Nie Ping,Lu Ming,Chang Limin
Mxenes, a general term for a novel class of two-dimensional carbon–nitrogen compounds, which attracted extraordinary attention because of their unique electrochemical property. In this paper, an Ag-TiO 2 /MXene composite material was prepared for paraquat (PQ) detection by differential pulse voltammetry (DPV). It was found that the detection limit reached as low as 0.01 μM and linear range was from 0.05 to 15 μM (split into two sections: 0.05 to 1 μM and 1 μM to 15 μM). The Ag-TiO 2 /MXene composite electrode material exhibits excellent anti-interference properties to the species including the ions such as Cu 2+ , Na + , Ca 2+ , Zn 2+ , Cl − , SO 4 2− and biomass molecules such as glucose, ascorbic acid and uric acid. In the presence of organophosphorus pesticides, the electrode also showed good anti-interference. The excellent paraquat detection capability of the Ag–TiO 2 /MXene electrode material should be attributed to the synergistic effect obtained by decorating Ag and TiO 2 on MXene. In conclusion, the functionalization of MXenes through surface-modification provided a feasible route for ultrasensitive electrochemical sensors construction.
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