JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yucheng Li,Kuan Ren,Shuai Cheng,Yahua Hu,Xuechun Yang,Shutong Hao,Shenye Liu,Naixin Li,Zhan Xu,He Feng,Xing Zhang,Tao Xu,Xiaoyan Zhou,Yuji Wu,Zhenghua Yang,Pin Yang,Jianjun Dong,Yulong Li,Huiyue Wei,Xiaoshi Peng,Xiangming Liu,Zanyang Guan,Zhiwen Yang,Jin Li,Yunsong Dong,Dong Yang,Tao Yi,Jiamin Yang,Yongkun Ding,Zhixiang Sun,Xiaolin Liu,Mu Gu,Jingtai Zhao,Guang Yang,Qianli Li
The ultrastable encrypted storage of X-ray image with quantitative and ultrahigh-spatial resolution are crucial for a wide range of applications in radiation imaging, and it can be achieved by using the radio-photoluminescence (RPL) material, Ag-doped phosphate glass (Ag-PG), which was fabricated via the melt-quenching method. Under X-ray irradiation, Ag-PG produces a luminescence center, obvious 650 nm emission peak, which can be repeatedly excited by ultraviolet light without intensity attenuation. Quantitative X-ray image storage was realized based on the linear relationship between RPL intensity and X-ray irradiation time. X-ray image with a submicron spatial resolution of 0.7 µm was achieved, which could be stably stored without attenuation for more than 300 days. This submicron level X-ray image can be written into the Ag-PG as an encrypted information, and can only be visualized by an ultraviolet light. Additionally, heat treatment (400 °C for 2 h) could eliminate the influence of X-ray radiation on the Ag-PG, and restore the state of the Ag-PG before X-ray irradiation, which allows the recyclability and reusability of the Ag-PG. This research is of great significance for promoting the encrypted storage of X-ray images based on Ag-PG or other RPL materials.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 36
·8560-8569
·
IF 5.16
Xingwang Lan,Yiming Li,Cheng Du,Tiantian She,Qing Li,Guoyi Bai
Graphical Carboxylation catalysts : Porous carbon nitride frameworks with uniform and rich nitrogen dopants and abundant porosity were successfully fabricated through the carbonization of the covalent triazine frameworks at different pyrolysis temperatures, and used as supports to immobilize and stabilize Ag nanoparticles for catalytic CO 2 conversion (see picture). Porous carbon nitride frameworks (PCNFs) with uniform and rich nitrogen dopants and abundant porosity were successfully fabricated through the direct carbonization of the covalent triazine frameworks (CTFs) at different pyrolysis temperatures and used as supports to anchor and stabilize Ag nanoparticles (NPs) for catalytic CO 2 conversion. Importantly, the pyrolysis temperature plays a crucial role in the properties of porous carbon nitride frameworks. The material carbonized at 700 °C showed the highest surface area and micro- and mesoporous structure with a certain interlayer distance. Taking advantage of their unique surface characteristics, PCNF-supported Ag NP catalysts (Ag/PCNF- T , T =pyrolysis temperature) were prepared by a simple chemical method. A series of characterizations revealed that Ag NPs are embedded in the porous carbon nitride frameworks and confined to a relatively small size with high dispersion owing to the assistance of the abundant surface groups and porous structures. The as-obtained Ag/PCNF- T catalysts, especially Ag/PCNF-700, showed excellent catalytic activity, selectivity, and stability for the carboxylation of CO 2 with terminal alkynes under mild conditions. This can be due to the existence of abundant nitrogen atoms and diverse porosity, which resulted in highly efficient catalytic activity and stability.
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-10
·
IF 5.7
Wang Zedong,Zhang Liang,Sun Lian,Bao Siqi,Liu Dajun,Li Hongji,Liu Yuming
Silver nanocubes monolayer-modified polydimethylsiloxane (Ag NC/PDMS) flexible SERS substrates have been prepared by a three-phase interface self-assembly procedure. The combination of this method with membrane technology brings nanoparticles in close proximity, densely, and regularly arranged in monolayers over a large area, leading to excellent SERS properties. Considering the complexity of practical detection, molecular imprinted polymers (MIPs) were anchored on the surface of SERS substrate and applied to selective detection of microcystin-LR (MC-LR). It is worth mentioning that the SERS imprinted membranes (AP-MIMs) were still clearly detected at a concentration of 0.1 µg·L −1 of MC-LR in drinking water, and the detection limit was as low as 0.0067 µg·L −1 . The substrate exhibited excellent uniformity with a relative standard deviation (RSD) of 6.1%. In the presence of interference molecules, AP-MIMs exhibited excellent selectivity for MC-LR. Furthermore, in the spiking and recovery tests of practical lake water samples, the method showed excellent recoveries ranging from 96.47 to 105.31%. It has been demonstrated that the prepared AP-MIMs can be applied to sensitive and specific detection of trace amounts of MC-LR in drinking water. Graphical
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Analytical Methods
·
2018
·Vol. 10
·期 37
·4518-4524
·
IF 2.073
Qijun Dai,Te Wei,Changli Lv,Fang Chai
In this study, we have reported a facile, cost-effective method for the synthesis of silver nanoparticles (Ag NPs) using uric acid (UA) as the reducing agent. Techniques such as UV-visible spectroscopy, transmission electron microscopy and X-ray spectroscopy were performed to characterize the generated UA–Ag NPs. UA–Ag NPs exhibited excellent specificity towards Ba2+ and Sr2+, which could be traced by UV-visible spectra and the naked eye; we also obtained the lowest detection limits of 52.1 nM and 27.5 nM for Ba2+ and Sr2+, respectively. The proposed method provided sensitive and rapid detection of Ba2+ and Sr2+ at the nM level in water samples, and the values were much lower than the U. S. EPA standard for the maximal limits of these metal ions in drinking water. UA–Ag NPs could be employed as a colorimetric probe to assay Ba2+ and Sr2+ in lake water, indicating their potential applicability for detection in real samples. As far as we know, this is the first attempt for the colorimetric detection of Sr2+ by noble metal nanoparticles. Furthermore, UA–Ag NPs exhibited excellent potential for catalyzing the reduction of nitrophenols and potassium ferricyanide.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Yiheng Yuan,Xishun Peng,Cunwei Wang,Haili Zhang,Caizhen Zu,Zhangyu Zhou,Zhongchen Bai
The threats of antibiotic residues to human health and the environment have become more and more severe due to the overuse of antibiotics in agriculture. Here, multi-walled carbon nanotubes (MWCNTs) were used to prepare MWCNTs@ZnO/Ag substrate by a simple two-step electrochemical deposition process to detect the enrofloxacin (ENR) residues in pork. The coral-like MWCNTs with a large surface area could promote ENR adsorption and provide more sites for growing the ZnO/Ag nanostructures. Moreover, ZnO/Ag nanostructures could not only facilitate the electron transfer to increase Raman intensity but also improve the stability of MWCNTs@ZnO/Ag substrate. Thus, the MWCNTs@ZnO/Ag substrate could easily recognize ENR molecules at a low concentration of 5 × 10 −10 M due to the stronger charge transfer effect between the substrates and analytes. In addition, the limit of detection of ENR residues in pork samples by using MWCNTs@ZnO/Ag substrate was up to 5.87 nM. The SERS sensor of the MWCNTs@ZnO/Ag substrate has a high sensitivity and long-term stability for the detection of antibiotic residues in food, which could be applied in fields of food safety.
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Research
·
2025
·
IF 10.7
Jie Zhou,Jiao Yang Lu,Zhi Xin Xie,Dong Hua Wang,Bin Sheng He,Wei Tao Huang
Polymetallic nanomaterials have important development potential by integrating the properties and advantages of their components. However, their preparation paradigm urgently needs to be updated to make full use of their characteristics to realize their multifaceted applications. In this study, multifunctional trimetallic gold–silver–chromium nanocomposites (Au–Ag–Cr NCs) were successfully synthesized, and their polymetallic plasmonic absorption properties were used in a variety of applications, from multimode and multianalyte sensing, advanced arithmetic, and reversible logic to long-text information protection. Au–Ag–Cr NCs with Au or Ag nanoparticles anchored on Cr nanobelts were synthesized using Au–Cr nanoseeds, Ag + , ascorbic acid as the reductant, and sodium dodecylbenzenesulfonate as the stabilizer. The resulting Au–Ag–Cr NCs exhibited multichannel sensing ability for 2 analytes (Hg 2+ and hypochlorite), with remarkably improved selectivity and sensitivity when analyzing combined channels. Multiresponsiveness of Au–Ag–Cr NCs to diverse substance combinations underpins input–output mapping relationships, enabling advanced molecular logic computations (such as arithmetic and reversible logic). By digitizing its intrinsic sensing and response mechanisms, advanced molecular information protection (including encoding, encryption, and information concealment) for extended text were successfully implemented. This work not only offers novel insights into the design and multifunctionality of multicomponent nanocomposites but also paves the way for a new paradigm in molecular information technology that integrates sensing, logic processing, and information security.
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IONICS
·
2025
·
IF 2.6
Liu Baochang,Wang Jianxin,Wang Bo,Kang Chongqing
Rechargeable aqueous zinc-ion batteries (RAZIBs) have emerged as promising candidates for large-scale energy storage systems, owing to their low cost, high safety, and environmental benignity. However, their practical application is hindered by intrinsic limitations of cathode materials, including sluggish Zn 2+ diffusion kinetics, poor electrical conductivity, and structural degradation during cycling. Herein, we report a facile hydrothermal strategy to synthesize Ag-doped MnO 2 cathode with uniform urchin-like nanostructures surrounded by nanowires as high-performance cathodes for RAZIBs. The optimal 5 wt% Ag doping yields denser nanowire arrays, namely 5Ag/MnO 2 , increases accessible active sites, and introduces lattice defects while preserving the tetragonal MnO 2 crystal structure ( I 4 /m ). The electrochemical characterization demonstrated that 5Ag/MnO 2 exhibited significantly enhanced kinetics, including lower charge-transfer resistance, reduced polarization, and higher Zn 2+ diffusion coefficient. Consequently, the 5Ag/MnO 2 cathode delivered a high initial discharge capacity of 153.4 mAh g −1 at 1 A g −1 and superior long-term cycling stability (the discharge specific capacity remained at 135.5 mAh g −1 and 88.3% capacity retention after 500 cycles). Mechanism studies via ex situ XRD, XPS, and CV reveal a reversible Zn 2+ /H + storage mechanism involving phase transformation between MnO 2 and ZnMn 2 O 4 , with mixed capacitive and intercalation behavior. The enhanced performance is attributed to Ag doping facilitating rapid ion diffusion, improving electronic conductivity, and stabilizing the hierarchical structure. This work provides a viable strategy for designing high-performance MnO 2 -based cathodes for advanced zinc-ion batteries, advancing the practical application of RAZIBs.
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Polymers
·
2025
·Vol. 17
·期 12
·1716
·
IF 4.9
Lili Kong,Xinna Yu,Qifang Sun,Meizhen Huang,Tianyuan Liu,Jie Chen
Polycyclic aromatic hydrocarbons (PAHs) have attracted significant attention due to their severe threats to both ecological systems and human health. In this paper, a high-performance surface-enhanced Raman spectroscopy (SERS) substrate based on NCF/GO/Au@Ag nanocomposites was developed, which enabled sensitive and stable detection of PAHs. The NCF/GO/Au@Ag substrate synergistic utilizes the localized surface plasmon resonance (LSPR) effect of Au@Ag core–shell nanorods and the additional interfacial charge transfer provided by graphene oxide (GO) to exhibit extremely high sensitivity. And the three-dimensional fibrous network of nanocellulose (NCF) improved nanoparticle dispersion uniformity. Combined finite element simulations and experimental studies verified that the dual plasmonic resonances (512 nm and 772 nm) of Au@Ag nanorods optimally match 785 nm excitation, yielding an enhancement factor of 5.21 × 10 5 . GO integration enhanced Raman signals by 1.68-fold through interfacial charge transfer, while the introduction of NCF reduced the signal relative standard deviation (RSD) from 36.88% to 4.29%. The NCF/GO/Au@Ag substrate achieved a detection limit of 10 μg/L for PAHs, demonstrating exceptional sensitivity and reproducibility.
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Chem Catalysis
·
2024
·
IF 11.5
Ji Wei Sun,Tingting Yu,Haoran Wu,Minghui Zhu,Aiping Chen,Cheng Lian,Hua Gui Yang,Peng Fei Liu
High cost of pure CO 2 feed constitutes a significant economic obstacle in industrial-scale CO 2 electrolysis. Direct CO 2 electrochemical conversion from flue gas has emerged as a promising strategy to reduce feed cost, while the O 2 in flue gas cannot be ignored due to its strong reactivity. Here, we achieved fast, selective CO electrosynthesis directly fed with simulated oxygen-containing flue gas (95% CO 2 +5% O 2 ) over the amine-confined Ag catalysts in a flow cell, among which dimethylamine-modified Ag exhibited 80.6% CO Faradaic efficiency with partial current density of 333.7 mA cm −2 . In situ spectroscopy demonstrated that dimethylamine confinement endows a robust CO 2 adsorption-conversion capacity. Theoretical calculations further elucidated that amine modification could not only mediate CO 2 adsorption and ∗COOH intermediate formation but could also block the ∗OOH intermediate pathway in the side reaction of oxygen reduction. These findings pave a new avenue for rational design of amine-confined electrocatalysts for direct flue gas conversion and utilization.
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ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Hengqian Jin,Shufei Wei,Yunpeng Jiang,Huarong Nie,Xinping Zhang,Aihua He
In this study, snowman-like Janus particles (PDVB/PS@SiO 2 ) were proposed as carriers of Ag nanoparticles (Ag@J) to construct a hierarchical hybrid conductive powders by further admixing with MWCNTs for the development of high-performance microwave-absorbing materials. The Ag@J/MWCNT composite powders have several advantages in microwave absorption, such as the polarization of SiO 2 hemispheres, multiple reflections and scattering of electromagnetic waves in the hollow cavity of PDVB/PS hemispheres, improved conductivity and dielectric loss originating from the dense deposition of Ag nanoparticles and incorporation of MWCNTs. Furthermore, the composite powders allow the interfacial polarization and favorable impedance matching. Notably, the asymmetric hemispheres of the Ag@J particles result in close packing, further reducing the transmission of electromagnetic waves. The Ag@J particles demonstrated a minimum reflection loss (RL min ), indicating their potential application in microwave absorption. When further integrated with MWCNTs, the Ag@J/MWCNT composite powders, containing 36.4 wt% of Ag@J, exhibited strong absorption (−27 dB), wide absorption bandwidth (16.5 − 18 GHz), and a low thickness (5.5 mm). The Janus particles reported in this study show high potential applications in microwave-absorbing powder materials.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Mingjun Zou,Guangkai Jin,Xinwei Wang,Yikun Ji,Bin Liu,Shujuan Liu,Qian Ye,Feng Zhou
Hydrogels show great potential for marine antifouling, but their low mechanical strength and limited antifouling effectiveness hinder their broader application. Herein, the 3-sulfopropyl methacrylate potassium (SPMA) polymer brushes layer was grafted onto MXene, followed by in situ reduction to form silver nanoparticles (AgNPs) with an average particle size of about 10 nm. The resulting 0D/2D MXene-SPMA@Ag nanosheets exhibit effective antifouling capabilities, with antibacterial and algal removal rates exceeding 90 %. Meanwhile, composite antifouling hydrogels were developed by incorporating functionalized nanosheets into the hydrogel matrix. The incorporation of MXene-SPMA@Ag significantly enhanced mechanical strength, anti-swelling behavior, and friction reducing properties of the hydrogels. Compared to the blank hydrogel, the mechanical properties of the composite hydrogel were significantly improved, with the tensile strength increasing from 99 KPa to 238 KPa and the strain rising from 517 % to 861 %. In addition, MXene-SPMA@Ag/Gel showed excellent antifouling performance, with an antimicrobial activity approaching 100 % and an algae removal rate exceeding 90 %. These improvements were attributed to the synergistic effect between the MXene-SPMA@Ag nanosheets and the hydrogel.
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MOLECULES
·
2019
·Vol. 25
·期 1
·124
·
IF 3.06
Sufeng Zhang,Yongshe Xu,Dongyan Zhao,Wenqiang Chen,Hao Li,Chen Hou
A facile approach was successfully developed for synthesis of cellulose nanocrystals (CNC)-supported magnetic CuFe2O4@Ag@ZIF-8 nanospheres which consist of a paramagnetic CuFe2O4@Ag core and porous ZIF-8 shell. The CuFe2O4nanoparticles (NPs) were first prepared in the presence of CNC and dispersant. Ag NPs were then deposited on the CuFe2O4/CNC composites via an in situ reduction directed by dopamine polymerization (PDA). The CuFe2O4/CNC@Ag@ZIF-8 nanocomposite was characterized by TEM, FTIR, XRD, N2adsorption-desorption isotherms, VSM, and XPS. Catalytic studies showed that the CuFe2O4/CNC@Ag@ZIF-8 catalyst had much higher catalytic activity than CuFe2O4@Ag catalyst with the rate constant of 0.64 min−1. Because of the integration of ZIF-8 with CuFe2O4/CNC@Ag that combines the advantaged of each component, the nanocomposites were demonstrated to have an enhanced catalytic activity in heterogeneous catalysis. Therefore, these results demonstrate a new method for the fabrication of CNC-supported magnetic core-shell catalysts, which display great potential for application in biocatalysis and environmental chemistry.Keywords:CuFe2O4nanoparticles;cellulose nanocrystals;Ag nanoparticles;ZIF-8 catalysis;4-nitrophenol reduction
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