CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6444-6452
·
IF 3.849
Li Zhang,Dichao Shi,Baocang Liu,Geng Zhang,Qin Wang,Jun Zhang
A facile hydrothermal etching process was developed to synthesize TiO2/Ag nanocubes for enhanced photocatalytic application. The synthesis was carried out by chemically etching hollow @TiO2 spheres in the presence of an AgF or AgF/NaF solution under hydrothermal conditions. Utilizing F− as a morphology-directing agent and Ag+ as an Ag source during the etching process, TiO2 nanocubes can be easily formed with their active high-energy facets exposed and Ag nanoparticles can be in situ deposited simultaneously on the surface of the TiO2 nanocubes to generate hybrid TiO2/Ag nanocubes. The resulting TiO2/Ag nanocubes were well controlled with Ag nanoparticles uniformly distributed on the surface of the TiO2 nanocubes. The morphologies of TiO2/Ag can be altered from ellipsoidal to cubic shapes depending on the amounts of AgF or AgF/NaF used for chemical etching. Due to the exposure of the active high-energy facets of TiO2 and the uniform deposition of Ag nanoparticles, the obtained TiO2/Ag nanocubes showed superior catalytic performance for the photocatalytic degradation of rhodamine B under visible-light radiation. It is proposed that the surface plasmon resonance effect arisen from Ag nanoparticles on TiO2 nanocubes can effectively enhance the visible-light driven photocatalytic properties of TiO2/Ag photocatalysts. Meanwhile, due to the etching of F ions during the synthetic process, the morphology variation of TiO2 from spherical to cubic shapes may be beneficial to the exposure of high energy {001} facets, which is liable to produce more electron–hole pairs in the photocatalytic process, and electron–hole pairs can combine with OH− to produce large amounts of hydroxyl radicals, eventually accelerating the decomposition of the organic dye.
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Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Zhijie Zhang,Yunping Wu,Zhihua Wang,Xueyan Zou,Yanbao Zhao,Lei Sun
Silver nanoparticle-embedded polyvinyl alcohol (PVA) nanofibers were prepared through electrospinning technique, using as antimicrobial agents and surface-enhanced Raman scattering (SERS) substrates. Ag nanoparticles (NPs) were synthesized in liquid phase, followed by evenly dispersing in PVA solution. After electrospinning of the mixed solution at room temperature, the PVA embedded with Ag NPs (Ag/PVA) composite nanofibers were obtained. The morphologies and structures of the as-synthesized Ag nanoparticles and Ag/PVA fibers were characterized by the techniques of transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Ag NPs have an average diameter of 13.8 nm, were found to be uniformly dispersed in PVA nanofibers. The Ag/PVA nanofibers provided robust antibacterial activities against both Gram-positive Staphylococcus aureus ( S. aureus ) and Gram-negative Escherichia coli ( E. coli ) microorganisms. It's also found that Ag/PVA nanofibers make a significant contribution to the high sensitivity of SERS to 4-mercaptophenol (4-MPh) molecules.
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PubMed
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 48
·12678-12687
·
IF 5.256
Jing Zhao,Li Long,Guojun Weng,Jianjun Li,Jian Zhu,Jun-Wu Zhao
We synthesized a novel bimetallic core–shell–satellite surface-enhanced Raman scattering (SERS) substrate (AuNS@mSiO2@AgNP) that consists of a gold nanostar (AuNS) core, a mesoporous silica (mSiO2) shell and a layer of silver nanosphere (AgNP) satellites. The core–shell–satellite nanostructure was formed by growing branches in the mSiO2 shell of mSiO2 coated gold nanospheres (AuNP@mSiO2) using AuNPs as the seeds, and the subsequent deposition of AgNPs on the mSiO2 surface. The growth of AuNSs in mSiO2 leads to the formation of a large number of closely spaced branches which provide enormous hotspots; and by varying the length of the branches, the nanogap distance between the AuNS core and the AgNP satellites can be carefully adjusted. Besides, mSiO2 could allow the infiltration of the analyte into the nanogap area that has high SERS enhancement. To demonstrate the feasibility of the SERS substrate, the bimetallic core–shell–satellite nanostructures were used for the label-free detection of a pesticide named thiram. The AuNS@mSiO2@AgNP was shown to have excellent selectivity and SERS activity which is significantly higher than that of AuNS@mSiO2, mSiO2@AgNP and AuNP@mSiO2@AgNP. This method exhibits a good linear response when the thiram concentration ranges from 10−9 M to 10−3 M, and the limit of detection (LOD) is 10−9 M, showing that the bimetallic core–shell–satellite nanostructure is a promising SERS substrate.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
H. Tang,X.H. Xia,Y.J. Zhang,Y.Y. Tong,X.L. Wang,C.D. Gu,J.P. Tu
Construction of high-capacity anode is highly important for the development of next-generation high-performance lithium ion batteries (LIBs). Herein we fabricate Si/Ag nanowires/reduced graphene oxide (Si/Ag NWs/rGO) integrated composite film by introducing binary conductive networks (Ag NWs and rGO) into Si active materials with the help of a facile vacuum-filtration method. Active Si nanoparticles are homogeneously encapsulated by binary Ag NWs-rGO conductive network, in which Ag NWs are interwoven among the rGO sheets. The electrochemical properties of the integrated Si/Ag NWs/rGO composite film are thoroughly characterized as anode of LIBs. Compared to the Si/rGO composite film, the integrated Si/Ag NWs/rGO composite film exhibits enhanced electrochemical performances with higher capacity, better high-rate capability and cycling stability (1269 mAh g −1 at 50 mA g −1 up to 50 cycles). The binary conductive network plays a positive role in the enhancement of performance due to its faster ion/electron transfer, and better anti-structure degradation caused by volume expansion during the cycling process.
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RSC Advances
·
2015
·Vol. 5
·期 118
·97320-97329
·
IF 3.84
Zhenjiang Yu,Yuanyuan Zhao,Bing Gao,Xuyang Liu,Liming Jia,Fangbo Zhao,Jun Ma
To improve the anti-biofouling properties of membranes, Ag-embedded nano-sized titanium dioxide (Ag-n-TiO2) particles were utilized as biocidal agents to modify polyvinyl chloride (PVC) membranes. Both Ag-n-TiO2/PVC flat sheet membranes and reinforced hollow fiber membranes were fabricated by a phase inversion method with varying Ag-n-TiO2 particle concentrations. As a result, the hydrophilicity, permeability, and retention capability increased with Ag-n-TiO2 concentrations from 0 to 1.5 wt%. In addition, the in situ antibacterial and anti-formation of biofilm properties of the modified membranes were greatly enhanced in the conventional inhibition zone test, Escherichia coli (E. coli) absorption experiment, fluorescent staining experiment, as well as long-term continuous biofouling test. The best results were obtained for the PVC membrane modified by 1.0 wt% Ag-n-TiO2. The optimized membrane presented not only better permeability and in situ antibacterial properties in the E. coli adhesion test, but also an enhancement in resisting biofilm formation and a more steady permeation flux in long-term filtration than the unmodified membrane.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 18
·期 1
·105-113
·
IF 2.279
Li Hongying,Wang Xueliang,Yu Zhangyu
An electrochemical sensor for simultaneous determination of dopamine (DA), uric acid (UA), guanine (G), and adenine (A) has been constructed by copolymerizing melamine monomer and Ag ions on a glassy carbon electrode (GCE) with cyclic voltammetry. The poly-melamine and nano Ag formed a hybridized film on the surface of the GCE. The morphology of the film was characterized by scanning electron microscope. The electrochemical and electrocatalytic properties of this film were characterized by cyclic voltammetry, linear sweep voltammetry, and square wave voltammetry (SWV). In 0.1 M phosphate buffer solution (pH 4.5), the modified electrode resolved the electrochemical response of DA, UA, G, and A into four well-defined voltammetric oxidation peaks by SWV; the oxidation peak current of DA, UA, G, and A increased 13-, 6-, 7-, and 9-fold, respectively, compared with those at the bare GCE and the SWV peak currents of DA, UA, G, and A with linear concentrations in the ranges of 0.1–50, 0.1–50, 0.1–50, and 0.1–60 μM, respectively. Based on this, a method for simultaneous determination of these species in mixture was setup. The detection limits were 10 nM for DA, 100 nM for UA, 8 nM for G, and 8 nM for A.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ting Zhou,Luyao Zang,Junjie Sun,Xia Zhang,Zijie Qu,Xia Liu,Guodong Zhang,Xiufeng Wang,Fang Wang,Zhiqing Zhang
Considering the severe hazard to health posed by nitrophenol (NP) isomers, especially 4-NP, reliable and selective detection strategies are urgently challenged. In this study, a fluorescence platform based on glutathione-stabilized gold/silver nanoclusters (GSH-Au/Ag NCs) and zeolite imidazolate framework material (ZIF-8) was developed for 4-NP detection. The synergistic effect of gold and silver makes the bimetallic nanoclusters (GSH-Au/Ag NCs) much better in optical properties than gold nanoclusters. Subsequently, GSH-Au/Ag NCs with aggregation-induced emission (AIE) effect was encapsulated into ZIF-8 to obtain GSH-Au/Ag NCs@ZIF-8 nanocomposite. Compared with GSH-Au NCs, the fluorescence signal was efficiently further improved nearly 7 times through the confinement effect of ZIF-8, and the fluorescence lifetime was increased from 1.2 μs to 6.9 μs. The addition of 4-NP effectively quenched the fluorescence emission peak of GSH-Au/Ag NCs@ZIF-8 at 600 nm, and the assay exhibited highly sensitivity to 4-NP with the detection limit of 1.11 μM from 2.0 μM to 35 μM. Especially, results showed that 4-NP could be easily discriminated from nitrophenol isomers (3-NP and 2-NP). The mechanism research demonstrated that the absorption curve of GSH-Au/Ag NCs@ZIF-8 + 4-NP overlapped greatly with the fluorescence excitation spectrum of GSH-Au/Ag NCs@ZIF-8, and the fluorescence lifetime of GSH-Au/Ag NCs@ZIF-8 did not change when 4-NP was present or not. Therefore, the mechanism of GSH-Au/Ag NCs@ZIF-8 for 4-NP detection was mainly attributed to the inner filter effect (IFE). Furthermore, the developed detection assay was applied to water sample with satisfactory recovery results, demonstrating its high potential in monitoring 4-NP in environment.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Zepeng Liang,Zelin Sang,Yumei Li,Zhenhua Chen,Xifan Mei,Xiuli Ren
Design of tough and functional hydrogel based on carbohydrate polymers is always attracting. Injectable hydrogel based on polyvinyl alcohol (PVA) and sodium alginate (Alg) have great potential for wound repair. However, simple hydrogel lacks functionality, such as antibacterial, which limits its application. Herein, we proposed a strategy of using Ag@MXene nanozyme to functionalize hydrogel and construct a near-infrared laser (NIR) responsive, reactive oxygen species (ROS) generating, and antibacterial platform for wound repair. Epigallocatechin gallate (EGCG) and Ag cluster modified Ti 3 C 2 (E-Ag@Ti 3 C 2 ) was prepared to enhance the performance of injectable PVA-alginate hydrogel (E-Ag@Ti 3 C 2 @H). The functionalized hydrogel presents porous structures (67 % porosity percentage) and excellent compressive and tensile properties (elongation up to 157 %). Under NIR laser irradiation, E-Ag@Ti 3 C 2 @H showed photothermal conversion efficiency and ROS generation ability. The inhibition rate for Methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli ( E. coli ) can reach to 91.2 % and 90.3 %, respectively. Molecular biology experiments showed that the composite hydrogel could promote angiogenesis and wound healing by upregulating the expression of anti-inflammatory factors. The obtained injectable E-Ag@Ti 3 C 2 @H hydrogel is potential in accelerating diabetic wound healing.
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DESALINATION
·
2024
·
IF 8.3
Chang Liu,Huan Zhang,Qinghan Wang,Jie Wu,Peng Chen,Shaoxian Song,Chun Zhan,Lei Wang,Feifei Jia
Thiosulfate technique is the most promising method to recover gold from electronic waste (e-waste) and natural ores due to its non-toxicity and high leaching efficiency. However, the bad affinity between Au(S 2 O 3 ) 2 3− and traditional adsorbents leads to unsatisfied gold recovery performance from leaching solution . In this work, highly efficient recovery of gold from low concentrated Au(S 2 O 3 ) 2 3− solution was achieved through enhanced photocatalysis process on a novel MoS 2 /MXene/Ag adsorbent. During recovery procedure, Au(S 2 O 3 ) 2 3− was in-situ reduced to Au 0 by photogenerated electrons and then anchored on MoS 2 /MXene/Ag. Under Au(S 2 O 3 ) 2 3− concentration <10 ppm, over 99 % gold recovery performance could achieve within 2 h. Experimental tests have proved that MXene made fully use of near infrared (NIR) light energy to exhibit better photothermal effect, and surface plasmon resonance (SPR) effect of Ag can simultaneously facilitate the separation of electron-hole pairs on MoS 2 . By means of external temperature input and rapid charge carrier transmission, plenty of electrons were excited from MoS 2 /MXene/Ag for Au(S 2 O 3 ) 2 3− recovery. This work paved a pathway for efficient Au(S 2 O 3 ) 2 3− recovery, which catered to the demand for green production of gold in the future.
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IONICS
·
2024
·
IF 2.4
Duan Jinrong,Si Fang,Wang Jiafen,Lu Linlin,Liu Jia,Song Yanyan,Mo Jiahui,Yu Jincui,Gao Jinlong
Fuel cell is considered the best candidate power source because of its high energy conversion rate, large capacity, and zero emission. However, noble metal catalysts as a key core material have some problems, such as high cost and poor durability. Therefore, in this paper, the active self-supporting nanoporous Pd–Ag catalysts are successfully formed by cryogenic treatment and one-step dealloying treatment of Al-Pd–Ag ribbons. The surface of the catalyst ligaments shows a certain degree of preferred orientation for high-index facets (220) and (311). The results show that the activity and stability of the catalysts for methanol electrocatalytic oxidation are significantly improved under the synergistic effect of special configuration and promoter Ag. The electrocatalytic activity of the catalysts is about 9.7 and 15.2 times that of commercial Pt/C and commercial Pd/C catalysts, respectively. After 5000 s, the current density of the 1800 rpm-deep2 sample is 382.88 mA·mg −1 , which is about 14.1 times and 39.9 times that of commercial Pt/C catalyst and commercial Pd/C catalyst.
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POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
In this study, MXene@Ag@PA hybrids were synthesized using radiation methods and chelation, aiming to enhance the key properties of EVA/MH composites, particularly their flame retardancy. The test results demonstrated that the addition of MXene@Ag@PA hybrids effectively reduced the amount of heat and smoke released during the combustion process of EVA composites. When 2 parts of MXene@Ag@PA hybrids were added, the peak heat release rate (pHRR) of the EVA/MH/2.0MXene@Ag@PA composite was reduced to 233 kW/m², representing a decrease of 78.5% and 63.3% compared to pure EVA and EVA/MH composites, respectively. Additionally, the time to reach the peak heat release rate was delayed to 300–400 s. Moreover, the MXene@Ag@PA hybrids further reduced the total smoke production (TSP) of the EVA composites to 3 m², which is 50% and 38.7% lower than that of pure EVA and EVA/MH composites, respectively. Besides providing significant flame-retardant enhancement to EVA/MH composites, the MXene@Ag@PA hybrids also acted as a radiation sensitizer. At an irradiation dose of 100 kGy, the addition of MXene@Ag@PA hybrids enhanced the cross-linking effect of EVA composites, thereby strengthening their mechanical properties.
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MOLECULES
·
2024
·Vol. 29
·期 12
·2946
·
IF 4.2
Meng Sun,Lili Huang,Hongjun Wang,Zhaoyi Zhang,Huijuan Niu,Zhenshan Yang,Hefu Li
Flexible and transparent surface-enhanced Raman scattering (SERS) substrates have attracted considerable attention for their ability to enable the direct in situ detection of analytes on curved surfaces. However, the curvature of an object can impact the signal enhancement of SERS during the measurement process. Herein, we propose a simple approach for fabricating a curvature-insensitive transparent SERS substrate by depositing silver nanoparticles (Ag NPs) onto a large-area wrinkled polystyrene/polydimethylsiloxane (Ag NP@W-PS/PDMS) bilayer film. Using rhodamine 6G (R6G) as a probe molecule, the optimized Ag NP@W-PS/PDMS film demonstrates a high analytical enhancement factor (AEF) of 4.83 × 105, excellent uniformity (RSD = 7.85%) and reproducibility (RSD = 3.09%), as well as superior mechanical flexibility. Additionally, in situ measurements of malachite green (MG) on objects with diverse curvatures, including fish, apple, and blueberry, are conducted using a portable Raman system, revealing a consistent SERS enhancement. Furthermore, a robust linear relationship (R2≥ 0.990) between Raman intensity and the logarithmic concentration of MG detected from these objects is achieved. These results demonstrate the tremendous potential of the developed curvature-insensitive SERS substrate as a point-of-care testing (POCT) platform for identifying analytes on irregular objects.
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