JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
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2018
·Vol. 29
·期 2
·232-239
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IF 1.444
Zhao Yanling,Xie Xianmei
As a kind of important water pollutant, heavy metal ions have a detrimental effect on the health of human. In this study, Au@Ag core-shell nanoparticles were synthesized by simple reduction of Ag + around Au nanoparticles and functionalized by DNAzyme. Based on thymine-Hg2+-thymine binding mode, a sensitive aptamer biosensor was constructed by utilizing functionalized Au@Ag core-shell nanoparticles as labels, and the sensitivity was enhanced by DNAzyme due to the catalysis toward H2O2. Under optimal conditions, square wave voltammetry was carried out to measure the current derived from Au@Ag nanoparticles labels. The current response of biosensor increased with the increasing of Hg2+ concentration, which presented linear relation in the range of 0.002-20 μg L -1 with limit of detection of 0.006 μg L -1. Meanwhile, the electrochemical biosensor showed superior reversibility, stability, repeatability, and selectivity.
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ACS Nano
·
2018
·
IF 13.709
Shanshan Yin,Dong Zhao,Qing Ji,Yonggao Xia,Senlin Xia,Xinming Wang,Meimei Wang,Jianzhen Ban,Yi Zhang,Ezzeldin Metwalli,Xiaoyan Wang,Ying Xiao,Xiuxia Zuo,Shuang Xie,Kai Fang,Suzhe Liang,Luyao Zheng,Bao Qiu,Zhaohui Yang,Yichao Lin,Liang Chen,Cundong Wang,Zhaoping Liu,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
Silicon (Si) has been regarded as one of the most promising anodes for next-generation lithium-ion batteries (LIBs) due to its exceptional capacity, appropriate voltage profile, and reliable operation safety. However, poor cyclic stability and moderate rate performance have been critical drawbacks to hamper the practical application of Si-based anodes. It has been one of the central issues to develop new strategies to improve the cyclic and rate performance of the Si-based lithium-ion battery anodes. In this work, super-small metal nanoparticles (2.9 nm in diameter) are in situ synthesized and homogeneously embedded in the in situ formed nitrogen-doped carbon matrix, as demonstrated by the Si/Ag/C nanohybrid, where epoxy resin monomers are used as solvent and carbon source. With tiny amount of silver (2.59% by mass), the Si/Ag/C nanohybrid exhibits superior rate performance compared to the bare Si/C sample. Systematic structure characterization and electrochemical performance tests of the Si/Ag/C nanohybrids have been performed. The mechanism for the enhanced rate performance is investigated and elaborated. The temperature-dependent I–V behavior of the Si/Ag/C nanohybrids with tuned silver contents is measured. Based on the model, it is found that the super-small silver nanoparticles mainly increase charge carrier mobility instead of the charge carrier density in the Si/Ag/C nanohybrids. The evaluation of the total electron transportation length provided by the silver nanoparticles within the electrode also suggests significantly enhanced charge carrier mobility. The existence of tremendous amounts of super-small silver nanoparticles with excellent mechanical properties also contributes to the slightly improved cyclic stability compared to that of simple Si/C anodes.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 12
·11754-11766
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IF 2.8
Dong Hao,Yin Yongyuan,Guo Xuetao
Ag/Bi 2 WO 6 /graphene oxide composite with excellent photocatalytic properties was successfully prepared by hydrothermal-photoreduction synergistic method and is applied in antibiotics degradation. The structure and properties of as-prepared photocatalysts were characterized by Fourier infrared spectrum (FTIR), X-ray photoelectron spectroscopy (XPS), specific surface area analyzer (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), and atomic force microscope (AFM). The results indicated that Ag and Bi 2 WO 6 were uniformly loaded on the surface of graphene oxide. In addition, graphene oxide with conjugated carbon network structures has been applied as a photocatalyst supporter for the high electronic conductivity and the large reactive sites. Compared with the pure graphene oxide, the as-prepared Ag/Bi 2 WO 6 /graphene oxide catalyst exhibited excellent degradation efficiency and stability for degrading tylosin under Xe lamp irradiation. Under simulated sunlight irradiation, the photodegradation efficiency of tylosin by Ag/Bi 2 WO 6 /graphene oxide achieved at 98% within 2 h, compared to 50% by pure graphene oxide. The excellent photodegradation ability is caused by the synergetic effect of Ag, Bi 2 WO 6 , and graphene oxide nanoparticles.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Weiqian Cai,Youqun Wang,Linshan Xiong,Yingjie Zheng,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
Cuprous oxide (Cu 2 O), a promising semiconductor material, has been less employed in the photocatalytic removal of uranium. In this work, silver and gold nanoparticles were introduced on the surface of Cu 2 O. HR-TEM, XRD and XPS were applied in characterized the physic-chemical properties of composite. In comparison to Cu 2 O, Au modified Cu 2 O (Au/Cu 2 O-N) demonstrated a significantly enhanced uranium removal rate, reaching 100% within 120 minutes. This represents a 2-fold increase in the uranium removal rate compared to pure Cu 2 O-N. The reason con be interpreted including the red-shift of the absorption band from 600nm-800nm, the formation of Schottky junction between Au and Cu 2 O, the electron traps constructed by Au itself. Consequently, the rate of photogenerated electron-hole complexation is significantly diminished. Free trapping and EPR prove that reactive radicals are O 2 - . This has led to the development of a novel approach, namely the synergistic strategy of noble metal loading and nitrogen-doped cuprous oxide, which has the potential to facilitate the visible light removal of U(VI) from toxic wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Fangqing Wang,Xueru Zhao,Ying Li,Limin Liang,Kotaro Sasaki,Qiuyan Hao,Wenhao Yuan,Sijia Li,Hui Liu
Transition-metal selenides exhibit excellent catalytic activity towards oxygen evolution reaction (OER), but suffering from serious performance degradation due to the surface reconstruction during OER. Herein, we found that the incorporation of Ag single atoms in NiSe 2 electrocatalyst (Ag SA -NiSe 2 ) could suppress the surface reconstruction, improving both catalytic activity (179 mV@10 mA cm −2 ) and stability (500 h @ ∼100 mA cm −2 ) for OER in 1.0 M KOH. The aberration corrected transmission electron microscope and X-ray absorption structure analysis reveal the co-existence of the Ag single atoms and Se vacancies in NiSe 2 matrix. In-situ Raman spectroscopy demonstrates that the introduction of single-atom Ag and Se vacancies in NiSe 2 successfully inhibits the formation of NiOOH species on the surface during OER, accounting for the excellent stability. The theoretical calculation result indicates that the Ag single atom and Se vacancies in NiSe 2 synergistically optimizes the adsorption/desorption of OER intermediates, boosting the intrinsic activity.
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FOOD CONTROL
·
2024
·
IF 5.6
Xinchen Wu,Limei Yin,Shipeng Gao,Ruiyun Zhou,Yang Zhang,Shanshan Xue,Heera Jayan,Hesham R. El-Seedi,Xiaobo Zou,Zhiming Guo
Patulin (PAT), a major contaminant in apples, poses a huge threat to human health as well as the economic sector. There is an urgent need to develop a sensitive, selective, and fast-responsive method to detect PAT in apples. However, one of the main challenges is overcoming the interferences of complex food matrices. In this study, we developed a highly sensitive competitive SERS sensor based on plasmonic nanoparticles modified by aptamers. The study utilized the formation of nanocomposites through aptamer-modified Au@Ag nanoparticles (NPs) and gold nano-stars (AuNSs) to induce high-intensity Raman signals from the SERS tag. Subsequently, in the presence of PAT, the nanocomposites underwent decomposition, evident through the significant decrease in SERS intensity. According to the standard curve established in this study, the detection limit was 0.0281 ng/mL. The competitive sensor was applied to spiked apple fruit and juice samples, indicating a recovery rate ranging from 91.98% to 102.94%. The excellent analytical performances and high sensitivity observed suggest the potential of the plasmonic nanocomposite sensing strategy in detecting PAT in real matrices.
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TALANTA
·
2025
·
IF 6.1
Rongjing Hu,Shilan Fu,Yongcong Zhou,Zhenyu Lin,Fengfu Fu,Yongqiang Dong
The current surface-enhanced Raman scattering (SERS) substrates typically feature a single energy level, posing challenges in coordinating electromagnetic enhancement (EM) and chemical enhancement (CM), thereby limiting the sensitive detection of numerous crucial target molecules. In this study, novel aggregated nanorings (a-NRs) hybridizing Ag, Au and AgCl are constructed as SERS substrates. On one hand, the obtained a-NRs exhibit robust localized surface plasmon resonance absorption, whose wavelength can be tuned to match three commonly used laser wavelengths (532, 633 and 785 nm) to gain strong EM effect. On the other hand, these materials possess the Fermi levels of Au nanoparticles and Au/Ag alloy, in addition to the valence band and conduction band of AgCl. The abundant energy levels of the obtained a-NRs facilitate increased charge transfer opportunities for molecules, leading to a strong CM effect. Therefore, the obtained a-NRs show ultra-high SERS sensitivity towards numerous molecules. Moreover, the unique chemical composition makes the obtained a-NRs have good long-term stability in terms of SERS activity. Besides providing high-performance SERS substrates, the valuable experience for coordinating EM and CM to construct highly active SERS substrate demonstrated in this work are expected to significantly advance the application of SERS.
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International Journal of Nanomedicine
·
2024
·
IF 6.6
Zhiwei Sun,Xiangru Chen,Fang Miao,Na Meng,Keqiang Hu,Shaotang Xiong,Ximing Peng,Liya Ma,Chuchao Zhou,Yanqing Yang
Introduction Graphene oxide (GO) nanoparticles have emerged as a compelling photothermal agent (PHTA) in the realm of photothermal antibacterial therapy, owing to their cost-effectiveness, facile synthesis, and remarkable photostability. Nevertheless, the therapeutic efficacy of GO nanoparticles is commonly hindered by their inherent drawback of low photothermal conversion efficiency (PCE).Methods Herein, we engineer the Ag/GO-GelMA platform by growing the Ag on the surface of GO and encapsulating the Ag/GO nanoparticles into the GelMA hydrogels.Results The resulting Ag/GO-GelMA platform demonstrates a significantly enhanced PCE (47.6%), surpassing that of pure GO (11.8%) by more than fourfold. As expected, the Ag/GO-GelMA platform, which was designed to integrate the benefits of Ag/GO nanoparticles (high PCE) and hydrogel (slowly releasing Ag+ to exert an inherent antibacterial effect), has been shown to exhibit exceptional antibacterial efficacy. Furthermore, transcriptome analyses demonstrated that the Ag/GO-GelMA platform could significantly down-regulate pathways linked to inflammation (the MAPK and PI3K-Akt pathways) and had the ability to promote cell migration.Discussion Taken together, this study presents the design of a potent photothermal antibacterial platform (Ag/GO-GelMA) aimed at enhancing the healing of infectious wounds. The platform utilizes a handy method to enhance the PCE of GO, thereby making notable progress in the utilization of GO nano-PHTAs.
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Royal Society Open Science
·
2024
·Vol. 11
·期 6
·
IF 2.9
Ze Liu,Nan Zheng,Jie Liu,Bo Jia,Xiaojun Wang,Pan Yao,Yayu Zhang,Fu Xia,Xinyu Guo
Marine biological fouling is a widespread phenomenon encountered by various oceanic ships and naval vessels, resulting in enormous economic losses. Herein, novel 4,5-dichloro-2-octyl-isothiazolone@sodium alginate/chitosan microcapsules (DCOIT@ALG/CS) were prepared through composite gel method using DCOIT as core materials, ALG and CS as shells, and CaCl2 as the cross-linking agent. The formed microcapsules (MCs) with Ag nanoparticles (AgNPs) were then filled in UV-curable polysiloxane (UV-PDMS), followed by UV irradiation to yield UV-PDMS/microcapsules/AgNPs (UV-PDMS/MCs/Ag) composite coatings. The constructed micro–nano dual-scale surface using the MCs and AgNPs improved the antifouling and antibacterial properties of UV-PDMS/MCs/Ag coatings. The as-obtained UV-PDMS/MCs/Ag coatings exhibited a static contact angle of about 160°, shear strength of 2.24 MPa, tensile strength of 3.32 MPa and elongation at break of 212%. The synergistic bacteriostatic effects of DCOIT and AgNPs in UV-PDMS/MCs/Ag coatings resulted in a bactericidal rate of 200 μg ml−1 towards Escherichia coli and Staphylococcus aureus with saturation at 100% within 10 min. In sum, the proposed composite coatings look promising for future marine transportation, pipeline networks and undersea facilities.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Xiong Zhao,Chenyi Cui,Li Ma,Zihan Ding,Junsheng Hou,Yaxuan Xiao,Biwu Liu,Baojin Qi,Jinhua Zhang,Xinlan Lu,Jinjia Wei,Satoshi Watanabe,Nanjing Hao
SERS measurements for monitoring bactericides in dairy products are highly desired for food safety problems. However, the complicated preparation process of SERS substrates greatly impedes the promotion of SERS . Here, we propose acoustofluidic one-step synthesis of Ag nanoparticles on paper substrates for SERS detection. Our method is economical, fast, simple, and eco-friendly. We adopted laser cutting to cut out appropriate paper shapes, and aldehydes were simultaneously produced at the cutting edge in the pyrolysis of cellulose by laser which were leveraged as the reducing reagent. In the synthesis, only 5 μL of Ag precursor was added to complete the reaction, and no reducing agent was used. Our recently developed acoustofluidic device was employed to intensely mix Ag + ions and aldehydes and spread the reduced Ag nanoparticles over the substrate. The SERS substrate was fabricated in 1 step and 3 min. The standard R6G solution measurement demonstrated the excellent signal and prominent uniformity of the fabricated SERS substrates. SERS detection of the safe concentration of three bactericides , including tetracycline hydrochloride , thiabendazole , and malachite green, from food samples can be achieved using fabricated substrates. We take the least cost, time, reagents, and steps to fabricate the SERS substrate with satisfying performance. Our work has an extraodinary meaning for the green preparation and large-scale application of SERS.
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Nano Energy
·
2024
·
IF 16.8
Dongzhen Chen,Yang Li,Jianzhao Gao,Meng Zhang,Junhao Liang,Tao Fu,Xiaoming Wu,Xinhai He,Liangjun Xia,Weilin Xu
Intelligent wearables with integrated biomechanics and biomolecule multimodal sensing systems are crucial for personalized healthcare. However, the modes of action of biomechanics and biomolecule sensing work in different ways. Hence, a method for manufacturing biomimetic fibers made of polyvinylidene fluoride (PVDF)@silver (Ag) is initially devised, and a textile carrier serves as a link for multimodal sensing of biomechanics and biomolecules. PVDF nanofiber membranes are created using a one-step electrospinning process . Next, by lowering the silver ion’s reduction potential, compact and homogenous Ag nanoparticles (NPs) are formed in-situ on the high-curvature PVDF fibers. Consequently, a PVDF@Ag fiber membrane with a piezoelectric response and a localized surface plasmon resonance (LSPR) effect is created, making it suitable for wearable sensors that can detect secreta molecules as well as muscle movements. PVDF@Ag fiber is twisted, taking inspiration from the spiral structure of butterfly antennae. Compared to untwisted, twisted PVDF@Ag fiber, this produces a surface-enhanced Raman scattering (SERS) output signal that is more stable and can resist for signal attenuation caused by tensile deformation during wearable sensing. The “fingerprint” spectra of SERS enable noninvasive extraction and detection of secretion signals at sweat and respiration. Additionally, a plausible correlation between the range of secretions produced and health-related data is examined. Additionally, the integrated PVDF@Ag by polyester fabric exhibits superior air permeability , moisture absorption , and antimicrobial properties. And, this multimodal sensing mechanism has an algorithm implanted with deep learning support. All things considered, the PVDF@Ag fiber functions as a bridge between biomolecules and biomechanics, which is essential for applications involving wearable healthcare management.
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FOOD CONTROL
·
2024
·
IF 5.6
Xiangyu Song,Huhu Wang,Xuefei Shao,Xiaobo Yu,Xinglian Xu
Salmonella Typhimurium is the prevalent pathogenic bacterium that causes foodborne-related diseases. Here, we developed a surface-enhanced Raman scattering (SERS) biosensor for S . Typhimurium detection. The biosensor was based on Au@Ag core-shell nanorods (Au@Ag NRs) to enhance Raman signal and aptamer-specific identification. 4-mercaptobenzoic acid (4-MBA) and aptamer-modified Au@Ag NRs were used as Raman signal probes. The aptamer adsorbed on the Au@Ag NRs surface when the reaction system was free of bacteria. Once S . Typhimurium was added, the aptamer then specifically identified and captured the cells. The decrease of free aptamers in solution restoring the SERS “hot spot” between the Au@Ag NRs and enhancing the 4-mercaptobenzoic acid (4-MBA) Raman signal. Quantitative analysis of S . Typhimurium was performed using Raman-enhanced spectroscopy. Under optimised conditions, the 4-MBA SERS intensity at 1072 cm −1 was used to determine S . Typhimurium in the range of 10 2 –10 7 CFU mL −1 (y = 1660.84x+2340.7, R 2 = 0.9912). The limit of detection was 64 CFU mL −1 . This method also has high specificity and is not interfered by the other five control bacteria to complete the detection of S . Typhimurium. The developed method is simple, rapid, sensitive and specificity, which can be used to detect actual samples. It can be potentially used for detecting bacteria.
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