APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Linlin Xu,Qingqiang Cui,Yue Tian,Anxin Jiao,Mengya Zhang,Shuang Li,Hengshuai Li,Ming Chen
Silver/silver halides (Ag/AgX, X = Cl, Br, I)-based photocatalysts with tunable energetic synergies have attracted intensive attention in solar-energy-conversion. Herein, we introduce an appealing ternary Au/Ag/AgCl nanochain with short curvilinear necklace-like nanoarchitectures via an ingenious one-step strategy by pulsed laser irradiation of metallic ions in solution. Compared with binary Ag/AgCl nanoparticles (NPs), the ternary nanochains with stronger intermetallic synergy exhibit improved absorbance capacity and enhanced localized surface plasmon resonance (LSPR) under broad visible-light irradiation. Then, the Au/Ag/AgCl nanochains can obviously accelerate photoinduced electron transfer and boost the separation of electron-hole on their surfaces, providing an excellent photocatalytic activity towards degradation of methylene blue (MB). Meanwhile, the enhanced synergistic coupling effect of the ternary nanocomposites also enables them to inhibit the photocorrosion under visible-light irradiation. Interestingly, compared to monodisperse NPs, the Au/Ag/AgCl nanochains with numerous interconnected NPs can be self-deposited on the bottom of solution after each photocatalytic reaction. Without the aid of extra and complicated nanocatalyst-separation procedures, then the clear-water will be easily obtained. Therefore, the unique photocatalyst possesses pronounced long-term stability, since ~ 97.6% photodegradation rate can be maintained after 14 recycling tests within two weeks. Undoubtedly, these findings will bring new opportunities to prepare high-performance photocatalysts for diverse practical applications.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2018
·
IF 4.92
Chunwang Yi,Jingkai Liu,Deqian Meng,Jing Lv,Xiaomin Zhang,You shu,Shengpei Su,Jin Zhu
A chitin-fastening Ag@AgCl composite film with decontamination properties was successfully prepared by one-step coagulation method of the chitin- LiCl/Dimethyl Acetamide (DMAc) solution with AgNO 3 . In this process, AgCl was formed in a chitin solution with the addition of AgNO 3 solution, and with the help of excess Cl − a solution of AgCl was formed. AgCl nanocrystals embedded on the surface of chitin were obtained after the solution was put into coagulation bath . The AgCl nano-crystals embedded on the surface of chitin film could be partly transformed into the Ag@AgCl by appropriate visible-light irradiation in the air. In order to explore the morphology and the formation mechanism of the composites, the well-prepared films were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), X-ray photo-electron spectroscopy (XPS), thermogravimetric analysis (TGA), ultraviolet spectro-photometry and UV–visible absorption spectrum . The decontamination ability and recyclability of composite film was evaluated by the degradation rate of methyl orange (MO) in recycling process. By comparison, the Ag@AgCl fastened in chitin matrix was more stable than fastened by cellulose matrix. Its photo-degradation efficiency could be still retained up to 95% after 5-cycle testing. Meanwhile, the composite film could be also kept excellent mechanical properties. This work provided a simple pathway to construct the functional chitin film which could be applied as a kind of stable recycling decontamination materials.
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高影响因子
MATERIALS RESEARCH BULLETIN
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2017
·
IF 2.446
Lin Lin,Jixing Chen,Zhezhe Wang,Zhuohong Feng,Feng Huang,Biao Zheng,Lili Huang,Zhipeng Yu,Zhiqiang Zheng
The NaBaPO 4 :Eu 2+ ,Yb 3+ quantum-cutting (QC) phosphors were prepared by the solid-state reaction. We confirm the luminescence of Yb 3+ is mainly derived from QC rather than common down-conversion. The QC efficiency η QE calculated from the luminescence decay curves reached a maximum as high as 197.4%. Furthermore, the QC emission was enhanced by decorating with quasi-spherical and uniform (∼100 nm) Ag nano-particles, due to localized surface plasmon resonance. The enhancement factor reached a maximum as 1.2337.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaopeng Han,Ying Huang,Qiao Gao,Rui Fan,Xuanyi Peng
NT@Cu and Ag@GF supported the aluminum (Al) composites had been synthesized by vacuum gas pressure infiltration and their microstructure, Coefficient of thermal expansion (CTE), thermal and mechanical properties were investigated. Cu particles encapsulated with NT had been designed to improve the dispersion of NT and form a carbon conductive network. The chemical plating process was used to enhance the wettability between graphite flakes (GF) and Al matrix and eliminate the harmful interfacial reactions. The composites of NT3 had displayed excellent in-plane thermal conductivity (TC) of 378.48 W/mK and stable CTE in high temperature application environment. What's more, the bending strength had been enhanced to approximately 85.15 Mpa. In this study, the innovative way can be applied to fabricate NT@Cu/Ag@GF/Al composites.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dexin Chen,Mingqiang Zhou,Jiacheng Hu,Zhixin Kang
A highly adhesive, reflective and conductive graphene-silver composite film has been fabricated on the modified surface of polyethylene terephthalate (PET) substrate. Graphene nanosheets (GNS) were decorated with silver nanoparticles (AgNPs-GNS) by electroless plating and co-deposited onto the polymer surfaces by spray-spin-spray technique. Peel test results showed that peeling strength between composite films and substrate increased from 1.2 N/cm to 4.8 N/cm by grafting. The average reflectance of composite films was reached 98% from results of the spectrometer, which was much higher than commercial Ag films. Owing to the co-deposition with AgNPs-GNS, the composite films exhibited a sheet resistance of 40 mΩ/sq, which was 80.3% lower than pristine silver films. In addition, AgNPs-GNS/Ag composite films maintained their conductive stability even after over 1000 times of bending tests and several hours of salt spray environment, indicating the application possibility of flexible circuits. Meanwhile, these composite films were used to produce several electronic components integrating on target circuit and the composite films could maintain a good stability of electrical conductivity even after being bending compression and bending tension. These results indicate that these high-quality, highly conductive and flexible composite films prepared by the spray-spin-spray method could be applied to real flexible electronics.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiao-han Pan,Ming-Jie Jin,Jian-hua Zu,Gang Han,Jing-jie Diao,Si-yu Liu,Qing Tang
For the efficient removal of radioactive iodide ions from medium and low radioactive contaminated water, an Ag-doped adsorbent was designed via radiation grafting method and chemical modification and applied based on the solid–liquid adsorption method. The silver loading content in the adsorbents could be flexibly decided by adjusting the sulfhydryl content. SEM/EDS, ATR, XPS, and XRD characterization methods were used to determine the features of the new adsorbents. With the silver content 67.9 mg/g and 125.6 mg/g in the adsorbents PGM25%-Ag + and PGM220%-Ag + respectively, the maximum I − adsorption capacities were varied at 29.92 mg/g and 100.82 mg/g. In wide pH conditions (pH7-11), PGM25%-Ag + was sufficient to achieve 131 I removal efficiency of over 92 %, and the removal efficiency was almost unaffected in the coexistence of high concentration (10 mmol/L) of anions and complex real contaminated seawater, highlighting the applicability and selectivity of the adsorbent. The adsorption behavior conformed to the Langmuir isothermal model and pseudo-second-order kinetics model. XPS analysis confirmed that excellent adsorption capacity and selectivity were attributed to the chemical adsorption mechanism of ion exchange and complexation occurs between I − and Ag on the solid–liquid interface, where AgI precipitation formed. In addition, the Ag + -doping adsorbent withstood the harsh conditions of 200 kGy irradiation by observing the ATR structure, thermal stability, and 131 I removal property. This study provides a feasible solution for the treatment of low and medium-radioactive contaminated seawater.
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高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 9
·095012
·
IF 1.929
Menghui Wan,Haodong Zhao,Zhihua Wang,Yanbao Zhao,Lei Sun
In this paper, a convenient method to fabricate flexible and free-standing surface-enhanced Raman scatting (SERS) substrates for direct bacteria detection without aptamer bonding is presented. SiO2 nanofibers were prepared via electrospinning and calcination by using tetraethyl orthosilicate as the precursor. Subsequently, it was coated with polydopamine (PDA) by self-polymerization. Finally, Ag@PDA@SiO2 nanofibrous membranes were obtained through in situ growth of Ag nanoparticles in Tollens' reagents. The as-prepared Ag@PDA@SiO2 composite nanofibrous membranes were characterized by techniques of scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, energy-dispersive x-ray spectroscopy and thermo gravimetric analysis. The flexibility of the as-prepared nanofibrous membranes were verified simply through manual folding. Small molecule probes of 4-mercaptophenol (4-MPh) and 4-mercaptobenzoic acid (4-MBA) were chosen to investigate the SERS sensitivity of the as-prepared Ag@PDA@SiO2 as free-standing substrates. Furthermore, Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), as typical strains of Gram-negative and Gram-positive bacteria, were performed to directly SERS detection by dropping bacteria suspension onto the fibrous membranes without any previous treatment, such as aptamer combination. In addition, the antimicrobial properties of the as-prepared Ag@PDA@SiO2 electrospinning nanofibrous membranes were tested by inhibition zone and turbidity methods. The results show that Ag nanoparticles with an average diameter of 50 nm are uniformly deposited on the surface of electrospinning nanofibers, and the as-prepared Ag@PDA@SiO2 nanofibrous membranes are flexible. As SERS substrates, it shows a rather high detection limitation of 10−11 mol l−1 for 4-MPh and 4-MBA. More importantly, this substrate can be applied for bacteria label-free SERS detection, i.e., complicated procedures are avoided. Meanwihile, the as-prepared Ag@PDA@SiO2 nanofibrous membranes exhibit excellent antibacterial properties. Thus, it has application prospects in trace bacteria detection and water purification.
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高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
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2022
·
IF 4.336
Qiong Liu,YingKai Wu,Ju Li,Ertao Liu,Fan Tian,Huiping Zhao,Rong Chen
Ag-decorated ZnO nanorods with different Ag contents were prepared by deposition-precipitation method, which demonstrated enhanced inhibition ability for the common pathogen, especially exhibited excellent antibacterial effects on clinical drug resistant bacteria. Moreover, Ag-decorated ZnO nanorods presented much lower cytotoxicity to HEK293 cell than that of silver nanoparticles (AgNPs). The electron spin resonance (ESR) spectra revealed that oxygen vacancies (V O ) were formed in ZnO after the decoration of AgNPs . To understand the improved antibacterial activity of Ag-decorated ZnO nanorods, reactive oxygen species (ROS) were determined. It was found that more H 2 O 2 were generated over Ag-decorated ZnO compared to pure ZnO, which was closely related to the oxygen vacancy (V O ) concentration. The production of large amount of H 2 O 2 resulted in more serious membrane leakage of cytosol and dehydrogenation inactivation of respiratory chain for bacterial, thus leading to the enhanced antibacterial activities of Ag-decorated ZnO nanorods.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuxin Li,Yiqing Chen,Ping Li,Gen Wang,Jing Wei
The deposition of silver nanoparticles (Ag NPs) on different substrates is promising in antibacterial applications. But it is limited by the aggregation problem and complex deposition procedure of Ag NPs. Herein, facile fabrication of antibacterial substrates with controllable deposition of Ag NPs via polyphenol reduction strategy is presented. Polyphenol with surface independent coating property is used to in situ deposit Ag NPs on diverse substrates (e.g., cotton textile, copper foil, steel sheet, iron sheet, glass slide, rubber and plastic sheet) via the reduction of Ag + . The modified substrate shows several unique properties, including high color maintenance (4.7 % change from the original), sustained and pH-responsive Ag + release behavior (about 40–10 % of Ag + ions at pH values of 4–8 at day 9, respectively), large diameters of inhibition zones (over 1 cm) and low minimum inhibitory concentrations (0.1 mg mL –1 ). The continuous contamination tests (5 cycles with the almost same effectiveness) and long-term stability analysis (over 25 days) manifest excellent recycling performance and stable antibacterial benefits. Finally, the results of practical applications on mask, shoe-pad and fresh box materials show that all the modified materials inhibited E. coli and S. aureus by more than 95 %. This work provides a versatile interfacial polyphenol reduction strategy for depositing Ag nanoparticles on various substrates. Such Ag-deposited product could be used for packaging and clothing sanitation.
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高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Shuanglong Ma,Sihui Zhan,Yuguo Xia,Pengfei Wang,Qianlei Hou,Qixing Zhou
The Ag/ZnO/g-C 3 N 4 composite photocatalyst, which was synthesized by thermal polymerization of a melamine precursor combined with solvothermal reaction, was used as a visible-light-driven biocide toward Escherichia coli ( E. coli ). The Ag/ZnO/g-C 3 N 4 composite displayed considerably increased visible-light-driven bactericidal activity compared to g-C 3 N 4 , Ag/g-C 3 N 4 , and ZnO/g-C 3 N 4 powders. The photocatalytic destruction of E. coli cells was verified by fluorescence-based cell live/dead analysis and SEM. The mechanism of increased bactericidal effect was studied by UV–vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, photocurrent response, and electrochemical impedance spectroscopy (EIS). The enhanced photocatalytic bactericidal effect was attributed to the matching conduction band levels of g-C 3 N 4 and ZnO and the surface plasmon resonance (SPR) effect of Ag nanoparticles, which resulted in enhanced adsorption of visible light, reduced recombination of free charges, and rapid separation and transportation of photogenerated electrons-holes. The disinfection mechanism was investigated using different chemical scavengers and electron spin-resonance spectroscopy (ESR), and indicating the important role of h + and H 2 O 2 . Furthermore, taking into account the bulk availability and better bactericidal effect of Ag/ZnO/g-C 3 N 4 , this work provides a new pathway to develop advanced materials for water disinfection.
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高影响因子
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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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Weihuang Yang,Hua Li,Jiajun Chen,Jun Yin,Jing Li,Yaping Wu,Bingjie Mo,Ting Wu,Baofan Sun,Zhiming Wu,Hao Wang,Linxi Dong,Gaofeng Wang
Monolayer transition metal dichalcogenides (TMDs) usually have weak optical emission due to the poor light absorption as being atomically thin. Enhancing their optical properties by surface plasmon resonance is attractive for applying atomically thin TMDs in optoelectronic and photonic devices. Here, Ag/WS 2 hybrid structure was fabricated by transferring monolayer WS 2 grown via chemical vapor deposition (CVD) onto optimized periodic Ag nanoprism array with well-matched resonance by controlling the mask geometry and etching time of polystyrene (PS) nanospheres. Significant enhanced photoluminescence (PL) emission and Raman scattering were successfully achieved. Especially, the higher enhancement is realized for neutral excitons of monolayer WS 2 . Theoretical calculations reveal that the plasmonic enhancement mainly results from the highly enhanced local electric field and the charge transfer. This work explores the feasibility of exciton emission and Raman scattering enhancement for TMDs with plasmonic nanostructures fabricated by low-cost and easily-manipulated nanosphere lithography (NSL), which paves a way towards the applications of plasmon-enhanced TMD sensors, emitters, and photodetectors.
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