MICROCHIMICA ACTA
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2023
·Vol. 191
·期 1
·1-12
·
IF 5.7
Liu Xinyu,Yu Yang,Xie Tianhua,Cao Zijin,Li Zhiyan,Li Yuejing,Gu Yingqiu,Han Caiqin,Yang Guohai,Qu Lulu
Monolayer g-C 3 N 4 -modified Au/Ag nanorods (g-C 3 N 4 /Au/Ag NRs) array is fabricated as a dual-function platform with high surface-enhanced Raman scattering (SERS) response and excellent photocatalytic degradation ability for bisphenol A (BPA) residues. FDTD simulation results of Au/Ag NRs proves that the electromagnetic field intensity is significantly enhanced at the gap of Ag NRs and Au NPs and the protrusion of Au NPs, which endows the arrays with excellent SERS activity. The arrays exhibit high sensitivity for rhodamine 6G (R6G) (LOD = 1.1 × 10 -11 mol/L) and high SERS enhancement (EF = 9.2 × 10 7 ). In addition, the g-C 3 N 4 /Au/Ag NRs could degrade ˃90% of BPA adsorbed on the substrate surface within 140 min under visible light irradiation, and maintains its SERS activity after repeated use for 4 times. The dual-function platform with high SERS response and excellent recycling capability is proved to be reliable and is very promising for monitoring of BPA residues in food. Graphical abstract
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BIOMACROMOLECULES
·
2023
·
IF 6.2
Hanchen Wei,Caiyun Yang,Feihu Bi,Bang Li,Rui Xie,Deshui Yu,Shuzhen Fang,Zan Hua,Qingqing Wang,Guang Yang
Glycopolymer-supported silver nanoparticles (AgNPs) have demonstrated a promising alternative to antibiotics for the treatment of multidrug-resistant bacteria-infected diseases. In this contribution, we report a class of biohybrid glycopolymersome-supported AgNPs, which are capable of effectively killing multidrug-resistant bacteria and disrupting related biofilms. First of all, glycopolymersomes with controllable structures were massively fabricated through reversible addition–fragmentation chain transfer (RAFT) polymerization-induced self-assembly (PISA) in an aqueous solution driven by complementary hydrogen bonding interaction between the pyridine and amide groups of N-(2-methylpyridine)-acrylamide (MPA) monomers. Subsequently, Ag+ captured by glycopolymersomes through the coordination between pyridine-N and Ag+ was reduced into AgNPs stabilized by glycopolymersomes upon addition of the NaBH4 reducing agent, leading to the formation of the glycopolymersome@AgNPs biohybrid. As a result, they showed a wide-spectrum and enhanced removal of multidrug-resistant bacteria and biofilms compared to naked AgNPs due to the easier adhesion onto the bacterial surface and diffusion into biofilms through the specific protein–carbohydrate recognition. Moreover, the in vivo results revealed that the obtained biohybrid glycopolymersomes not only demonstrated an effective treatment for inhibiting the cariogenic bacteria but also were able to repair the demineralization of caries via accumulating Ca2+ through the recognition between carbohydrates and Ca2+. Furthermore, glycopolymersomes@AgNPs showed quite low in vitro hemolysis and cytotoxicity and almost negligible acute toxicity in vivo. Overall, this type of biohybrid glycopolymersome@AgNPs nanomaterial provides a new avenue for enhanced antibacterial and antibiofilm activities and the effective treatment of oral microbial-infected diseases.
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Analytical Methods
·
2023
·Vol. 15
·期 37
·4851-4861
·
IF 3.1
Rui Yang,Baowen Zhang,Ya Wang,Yi Zheng,Qian Zhang,Xiupei Yang
Substrate materials with high sensitivity and storage stability are crucial for the practical analytical application of surface-enhanced Raman scattering (SERS) techniques. In this work, a SERS-active substrate (Si/Au@Ag/ZIF-67) was fabricated with a metal–organic framework (ZIF-67) on a plasmonic surface (Si/Au@Ag) via self-assembly. The as-prepared material combined the properties of the abundant hotspots of the Au@Ag nanoparticles and the excellent adsorption performance of ZIF-67 for organic molecules. The synergy leads to high sensitivity of the composite substrate with a low detection limit for 4-aminothiophenol (a typical Raman reporter molecule) down to 2.0 × 10−9 M and the analytical enhancement factor (AEF) of the SERS substrate is 3.4 × 106. Moreover, the substrates exhibited good repeatability, high reproducibility, and reliable stability due to the MOF coating. The SERS signal was stable after 60 days of storage at room temperature. Ultimately, the optimal Si/Au@Ag/ZIF-67 was applied as a SERS sensor to analyze thiram, and the results showed a linear concentration range from 10−7 to 10−5 M with good linearity (R2 = 0.9934). The recoveries of thiram in spiked apple juice were in the range of 95.7–102.3%, with relative standard deviations less than 4.3%. These results predict that the proposed SERS substrates may hold great potential for the detection of environmental and food pollution in practical applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Tao Yu,Ruqiu Ding,Fan Quan,Zhiyuan Ni,Xuanwen Liu,Yan He,Wenning Mu,Xuefei Lei,Yuhan Mo
The development of high activity catalysts with excellent durability is a great challenge to realize the industrialization of electrolytic water oxygen evolution. In this work, Ag nanoparticles modified cross column nickel-iron hydroxyl oxide system (NiFeAg) nanocomposites were synthesized by a two-step strategy. Through XPS spectrum, Tafel slope, and EIS electrochemical impedance spectroscopy, it was found that Ag mainly plays a conductive role, accelerates charge transfer, and adjusts the surface electronic structure, to improve the activity of the catalyst. Impressive is the overall hydrolysis performance, with a current density of 10 mA cm −2 achieved at an overpotential of 211 mV, which shows better performance than other catalysts reported in the literature. Finally, through the theoretical calculation of the determination steps of adsorption energy and rate of oxygen-containing intermediates, it is determined that the active center of the catalyst is mainly Ni site. According to the theory of D-band center, Ag can effectively adjust the D-band center, thereby adjusting the adsorption strength of Ni sites on the surface of NiFe catalyst to adsorbent, and finally improving the OER performance of the catalyst.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 32
·15089-15098
·
IF 3.3
Qixuan Qin,Na Liu,Yan Zhang,Weiyi Bu,Zhijie Zhou,Changhua Hu,Xiaohong Chuai
The sensitivity and selectivity of semiconductor metal oxides can be effectively improved by transition metal doping and noble metal loading. In this work, Ag-loaded p-type Zn-doped Fe2O3 (Ag@Zn–Fe2O3) nanoparticles were synthesized by a combination of a one-step hydrothermal route and a co-precipitation method. The prepared Ag@Zn–Fe2O3 nanoparticles show a peanut-like structure with a size of about 50–150 nm. The Zn doping and the Ag loading can synergistically improve the response of the Fe2O3 nanoparticles to acetone. At the optimum operating temperature (150 °C), the response of the Ag@Zn–Fe2O3 sensor to 100 ppm acetone is 50.2, which is significantly higher than 8.9 and 25.8 corresponding to Fe2O3 and Zn–Fe2O3, respectively. In addition, the Ag@Zn–Fe2O3 sensor exhibits excellent selectivity, good moisture resistance, and long-term stability to acetone. Meanwhile, the possible mechanism of the improved acetone sensing properties is also discussed.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-10
·
IF 5.7
Sun Lei,Guo Hao,Liu Bingqing,Pan Zhilan,Wu Ning,Zhang Hao,Yang Wu
Abstract A novel electrochemical biosensor with excellent performance was fabricated for levofloxacin (LEV) detection, which adopted triangular Ag nanoplates (Tri-AgNP) confined in a poly-L-cysteine (poly-L-Cys) film and a semiconducting covalent organic framework (COF) as the electrochemical sensing material. The developed electrochemical sensor revealed excellent analytical properties because of its good electrical conductivity, fast electron transfer, and abundant bioactive site. Based on this, a linear relationship between the LEV concentration and the peak current response at 0.92 V was obtained under the optimal experimental conditions by differential pulse voltammetry (DPV), with a wide linear range of 0.05 to 600 μM and a low limit of detection (LOD) of 0.0061 μM. The prepared sensor also realized sensitive and accurate determination of LEV in human serum and urine samples by standard addition method, with satisfactory recoveries (97.1 to 104%) and a low relative standard deviation of less than 4.6%. These results indicated that the novel ternary system has a promising application in the development of electrochemical signal probe and electrochemical biosensing platform. Graphical Abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jiajia Ye,Xing Gao,Zifan Wang,Juan An,Ying Wang,Qingli Liu,Zhen Kong,Jiaxu Qi,Zhao Wang,Wensi Li,Jibin Song,Guang Xia
Lithium metal is an attractive and promising anode material due to its high energy density and low working potential. However, the uncontrolled growth of lithium dendrites during repeated plating and stripping processes hinders the practical application of lithium metal batteries, leading to low Coulombic efficiency, poor lifespan, and safety concerns. In this study, we synthesized highly lithiophilic and conductive Ag nanoparticles decorated on SiO 2 nanospheres to construct an optimized lithium host for promoting uniform Li deposition. The Ag nanoparticles not only act as lithiophilic sites but also provide high electrical conductivity to the Ag@SiO 2 @Ag anode. Additionally, the SiO 2 layer serves as a lithiophilic nucleation agent, ensuring homogeneous lithium deposition and suppressing the growth of lithium dendrites. Theoretical calculations further confirm that the combination of Ag nanoparticles and SiO 2 effectively enhances the adsorption ability of Ag@SiO 2 @Ag with Li + ions compared to pure Ag and SiO 2 materials. As a result, the Ag@SiO 2 @Ag coating, with its balanced lithiophilicity and conductivity, demonstrates excellent electrochemical performance, including high Coulombic efficiency, low polarization voltage, and long cycle life. In a full lithium metal cell with LiFePO 4 cathode, the Ag@SiO 2 @Ag anode exhibits a high capacity of 133.1 and 121.4 mAh/g after 200 cycles at rates of 0.5 and 1C, respectively. These results highlight the synergistic coupling of lithiophilicity and conductivity in the Ag@SiO 2 @Ag coating, providing valuable insights into the field of lithiophilic chemistry and its potential for achieving high-performance batteries in the next generation.
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MOLECULES
·
2023
·Vol. 28
·期 24
·8063
·
IF 4.6
Chunyong Zhang,Haoyu Wang,Li Shu,Zhe Li,Jirong Bai,Yinpin Wen,Lin Zhu,Yin Geng,Hengfei Qin
PEDOT-Ag/AgCl is a highly promising material with dual functions of hydrogen evolution reaction (HER) and supercapacitors. In this study, a simple low-temperature stirring and light irradiation method was used to synthesize PEDOT-Ag/AgCl on the surface. Then, PEDOT-Ag/AgCl was analyzed using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy. PEDOT-Ag/AgCl reacted in 1 M KOH alkaline electrolyte with an overpotential of 157 mV at 20 mA·cm−2and a Tafel slope of 66.95 mv·dec−1. Owing to the synergistic effect of PEDOT and Ag/AgCl, this material had a small resistance (1.7 Ω) and a large specific capacitance (978 F·g−1at current density of 0.5 A·g−1). The synthesis method can prepare nanostructured PEDOT with uniformly-distributed Ag nanoparticles and rod-shaped AgCl on the surface, which can be used as both HER electrocatalysts and supercapacitor electrodes.
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TALANTA
·
2023
·
IF 6.1
Peng Jin,Wenlong Tan,Xu Li,Jinsong Fan,Kun Li
Iodine intake remains a major public health concern, as both iodine excess and deficiency are related to adverse effects on health. Therefore, developing simple and economical methods to detect I − is still in great demand. Herein, we constructed a visual I − sensing platform based on the uncoated Ag–Ti 3 C 2 nanohybrids using methyl orange (MO) as a colorimetric indicator . Plasmonic nanostructures are frequently employed in colorimetric analysis , but uncoated Ag nanoparticles (NPs) are unstable because their surface energies are usually high. Considering that Ag NPs can be etched by I − via forming Ag–I bond, we introduce Ag–Ti 3 C 2 nanohybrids because uncoated Ag NPs with immaculate surfaces are more conducive to binding with I − and being etched. Dissolved O 2 molecules adsorbed on Ti 3+ of Ti 3 C 2 MXenes enable the in situ generation of H 2 O 2 by iodine-etching of uncoated Ag–Ti 3 C 2 nanohybrids. ∙OH radicals promote the degradation of MO through a self-driven Fenton-like process, exhibiting the color variation from orange to transparent. Under optimal conditions, the absorbance of MO at 465 nm decreases linearly with the concentration of I − in the range of 0.5–300 μM, with a limit of detection as low as 0.31 μM. This work opens the feasibility of iodine-etching of Ag in developing novel probes for facile colorimetric determination of I − .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hui-fang Du,Jian Zhu,Guo-jun Weng,Jian-jun Li,Xin Li,Jun-wu Zhao
Ligand-mediated interface control has been broadly applied as a powerful tool in constructing asymmetric multicomponent nanoparticles (AMNP), and induces the anisotropic growth with fine-tuning morphology, composition, plasmonic property and functionality. As a new kind of AMNP, the synthesis of Janus Au-Ag nanoparticles with tunable negative surface curvature is still a challenge. Here, we demonstrate that the synergistic surface energy effects between gold nanodumbbells (Au NDs) with a negative surface curvature and 4-mercaptobenzoic acid (4-MBA) can direct the site-selective growth of anisotropic silver domains on gold nanodumbbells (Au NDs@Ag NPs). By adjusting the 4-MBA concentration-dependent interfacial energy, the Au NDs@Ag NPs could be continuously tuned from dumbbell-like core–shell structures, to L-shaped Janus, and then rod-like core–shell structures with directional and asymmetric spatial distributions of resizable Ag domains by site-selective growth. Based on the calculation results of discrete dipole approximation (DDA) method, it has been found that the Au NDs@Ag L-shaped Janus NPs with Ag island domains created polarization orientation-dependent plasmonic extinction spectra and hot spots around the negatively curved waist and Ag domains. The L-shaped Janus Au NDs@Ag NPs exhibited significantly plasmonic spectrum properties with four apparent LSPR peaks that cover from visible to near-infrared range and higher surface-enhanced Raman scattering (SERS) activity compared with the original Au NDs. The best SERS enhancement factor of 1.41 × 10 7 was achieved. This synergistic surface energy effect-based method involving the asymmetric growth of silver coating on gold nanoparticles with negatively curved surface presents a new method to design and fabricate nanometer optical devices based on asymmetric multicomponent nanoparticles.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2023
·Vol. 33
·期 8
·2562-2573
·
IF 4
Jiang Wenjie,Xu Qianrui,Bu Fengjie,Wei Yingying,Wang Yang,Wang Zhifei,Jiang Yong
In recent decades, magnetic nanomaterials with fast separation and recyclable performance have raised great interest for broad applications in catalysis, protein separation and immunodiagnostics. In this paper, Fe 3 O 4 nanoparticles with a size of (350 ± 50) nm were produced by the solvothermal method. Then, the nanoparticles were coated with a shell made of 3-aminophenol-formaldehyde (APF) resin to prevent agglomeration. The reaction was very rapid, and core–shell Fe 3 O 4 @APF nanospheres were produced by polycondensation within 10 min. Besides, the thickness of the APF shell could be easily adjusted in the range of 10–200 nm by controlling the reaction time and the concentration of 3-aminophenol and formaldehyde. In particular, the APF layer could also act as an effective carrier and reducing agent to capture hundreds of well-dispersed Ag nanoparticles for the abundant hydroxyl groups, obtaining sesame-ball-like Fe 3 O 4 @APF@Ag nanocomposites. The structure of sesame-ball can prevent silver nanoparticles from agglomerating, and Fe 3 O 4 core could provide strong magnetism. The magnetic Fe 3 O 4 @APF@Ag nanomaterials could catalyze the reduction of organic dyes (4-NP, MB and RhB), and the catalyst possessed high activity, with the conversion of dyes remaining above 90% within 3 min after 7 cycles.
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Journal of CO2 Utilization
·
2023
·
IF 7.7
Weiting Yu,Sizhuo Chen,Jieyun Zhu,Zhiqiao He,Shuang Song
Electrochemical CO 2 reduction reaction (CO 2 RR) towards CO is considered as one of the most promising routes to alleviate carbon emissions and achieve a carbon-neutral cycle. In this work, a highly dispersed Ag-BTC catalyst (BTC refers to the 1,3,5-benzenetricarboxylate ligand) with abundant catalytically active sites has been synthesized via a facile one-step hydrothermal method. Efficient, highly selective, and stable electrochemical reduction of CO 2 into CO has been achieved on the Ag-BTC electrocatalyst. The faradaic efficiency of CO production from the CO 2 RR is around 95%, which is within the range of highest values reported to date. A correlation between the structure of the Ag-BTC electrode and its enhanced catalytic performance has been established through the combination of characterization results and electrochemical measurements. Furthermore, a lower Gibbs free energy change (∆G) for the rate-determining step regarding the formation of intermediate COOH ads also leads to the superior catalytic performance of CO 2 RR on Ag-BTC.
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