CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yang Yang,Yijin Shu,Yinqiong Wu,Qingsheng Gao
Noble-metal nanostructures are promising for biosensing applications owing to their fantastic physicochemical properties, but the rational design of their easy-accessible and reactive surface is still challenging. This work is devoted to the interfacial engineering of Ag-Pd alloys, including tuning alloy composition and geometric structure, to promote the electrochemical biosensing performance. Through a co-tuning tactic with controlled reduction, channel-rich Ag 1 Pd 3 alloys with optimal electronic configurations and accessible active surface are successfully obtained, which afford high sensitivity, outstanding selectivity and excellent repeatability to detect H 2 O 2 and glucose biomarkers. As experimentally and theoretically evidenced, tailoring the composition of Ag-Pd alloys ameliorates electronic configurations due to ligand effects, which can optimize the binding with the key intermediate of OH*, and thereby boost electrochemical kinetic steps on surface. Meanwhile, tuning geometric structure with abundant channels enables fast transport of analytes toward largely-exposed active sites. Providing an atomic-level interpretation of structure-dependent biosensing, this work is anticipated to offer guidelines for the development of efficient sensing platforms.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Wenxian Wei,Dan Yu,Yu Du,Yicheng Ding,Qingli Huang
Au-Ag alloy nanoparticles (NPs) with controllable size and composition were synthesized by a facile, one-pot hydrothermal method. Various characterization techniques including TEM, UV–vis, EDX, HAADF-STEM and XPS were used to discuss the influencing factors for the size and composition of Au-Ag alloy NPs. It is obvious that the size and composition of Au-Ag alloy NPs could be adjusted by the experimental parameters. Catalytic and SERS performance of the Au-Ag alloy NPs were further investigated. Ideal catalytic and SERS performance could be also obtained via optimizing the size and composition of Au-Ag alloy. This work is of importance in theory research and practical application of the noble metal nanocomposites.
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Journal of Materials Chemistry B
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2019
·Vol. 7
·期 40
·6202-6209
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IF 5.047
Zhiqiang Wang,Xiuzhen Huang,Sheng Jin,Hongwei Wang,Lin Yuan,John L. Brash
The continuing emergence of antibiotic-resistant bacteria due to the excessive use of antibiotics has produced a strong demand for novel strategies and new materials that do not lead to bacterial resistance. In the present work silicon nanowire arrays modified with gold–silver alloy nanoparticles (SN-Au/Ag) was investigated as a photo-induced antibacterial material. It was shown that SN-Au/Ag can kill bacteria with high efficiency under sunlight in times of the order of a few minutes, and this is achieved through synergism between photothermal and photocatalytic effects. It appears that the combined effect of heat and reactive oxygen species (ROS) causes bacteria killing through damage to the cell membrane and leakage of cytoplasm contents. Both gold and silver in the alloy nanoparticles are required for the observed bactericidal action. Moreover, the SN-Au/Ag material can be “recycled” without loss of bactericidal activity. It is concluded that the silicon nanowire arrays modified with gold–silver alloy nanoparticles developed in this work has promise as an antibacterial nanomaterial for the development of novel antibiotics.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yaozu Wang,Rui Wang,Jianzhong Jiang,Hui Yang,Xingzhong Guo
Macroporous terbium-doped Ca 12 Al 14 O 32 Cl 2 (C12A7:Tb 3+ ) monoliths were synthesized via a sol-gel route accompanied by phase separation, and the luminescence performances and detection of Ag + in water of the C12A7:Tb 3+ monoliths were investigated in detail. The simulation of the hydrolysis and dimerization reactions of C12A7:Tb 3+ shows that the hydrolysis and dimerization of Tb 3+ are prior to Al 3+ , and the doped Tb 3+ will affect the sol-gel transition of the system. The addition of Tb element changes the macrostructure derived from phase separation and sol-gel transition, and decreases the macropore size of C12A7 monolith. Heat treatment allows the formation of a single mayenite phase C12A7:Tb 3+ without spoiling the macrostructure, and the Tb 3+ ions replace the position of the Ca 2+ ions of the “cage” structure without destroying the lattice structure of C12A7. The luminescence intensity of C12A7:3%Tb 3+ monolith reaches the maximum, and the corresponding macropore size and porosity are 0.3 μm and 79% respectively. High luminescence intensity of C12A7:Tb 3+ monolith is attributed to higher scattering light and wonderful high temperature stability derived from the macrostructure. The obtained macroporous C12A7:Tb 3+ material has a sensitive response to Ag + ions, and can become a promising fluorescence sensor for the detection of Ag + ions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Feihui Li,Ruiru Zhao,Bingye Yang,Wei Wang,Yu Liu,Jianping Gao,Yunlan Gong
Nowadays, energy shortage is one of the major problems in the world. Photocatalytic hydrogen production is a new type of energy technology with good application prospect. As a new type of photocatalytic semiconductor material, g-C 3 N 4 has attracted much attention as a photocatalyst . By ultrasonic treatment of a mixed solution of g-C 3 N 4 and bovine serum albumin, followed by adding a certain amount of silver nitrate solution and then directly hydrothermal treatment , a special dandelion-like g-C 3 N 4 /Ag (D-g-C 3 N 4 /Ag) was prepared. The scanning electronic microscopy, transmission electronic microscopy , X-ray diffraction, Fourier transform infrared, fluorescence and physicochemical adsorption methods were used to characterize the morphology and structure of D-g-C 3 N 4 /Ag. In addition, the photocatalytic H 2 production of D-g-C 3 N 4 /Ag with different Ag loadings or in different sacrificial agents and different pH conditions were investigated. The results indicated that when triethanolamine was used as sacrificial agent, photocatalytic hydrogen efficiency was the best, and the rate of photocatalytic hydrogen production reached 862 μmol g −1 h − 1 as the Ag loading was 4%.
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BIOELECTROCHEMISTRY
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2019
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IF 4.474
Mei Wu,Yuxiao Yang,Kaihang Cao,Chulei Zhao,Xiuwen Qiao,Chenglin Hong
In this study, a novel signal-amplified immunosensor was designed by using a microwave-assisted self-assembly method to synthesize ZnFe 2 O 4 -Ag/rGO nanocomposites. The conductivity of ZnFe 2 O 4 -rGO nanocomposites was significantly improved due to the effective inhibition of rGO accumulation by the insertion of ZnFe 2 O 4 and Ag nanoparticles (NPs) into graphene sheets. Excellent sensitivity and reproducibility were achieved through the microwave-assisted preparation of ZnFe 2 O 4 -Ag/rGO nanocomposites as a substrate, with the Ag NPs enhancing the signal because of the effective conductive matrix. The layer assembly process of the immunosensor was verified by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the fabricated immunosensor showed good linearity over a wide concentration range from 1 pg mL −1 to 200 ng mL −1 with a low detection limit of 0.98 pg mL −1 , and exhibited excellent specificity, good stability, and reproducibility. These qualities can contribute to the successful application of a label-free immunosensor in the detection of AFP in human serum.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Yu Zhang,Pengli Zhu,Gang Li,Zhen Cui,Chengqiang Cui,Kai Zhang,Jian Gao,Xin Chen,Guoqi Zhang,Rong Sun,Chingping Wong
Elliptic Cu–Ag nanoflakes were syntheszied via facile in situ galvanic replacement between prepared Cu particles and Ag ions. Alloy nanoflakes with high purity and uniformity present a size of 700 × 500 nm, with a thinness of 30 nm. Nontoxic and low-cost polyvinyl pyrrolidone was used as a dispersant and structure-directing agent, promoting the formation of the remarkable structure. Synthesized nanoflakes were utilized as a filler for conductive paste in an epoxy resin matrix. Conductive patterns on flexible substrates with a resistivity of 3.75 × 10–5 Ω·cm could be achieved after curing at 150 °C for 2 h. Compared with traditional silver microflakes, smart alloy nanoflakes provide much improved conductive interconnection, whose advantage could be attributed to their nanoscale thicknesses. It is also noteworthy that the conductive patterns are able to tolerate multiple bendings at different angles, having good conductivity even after 200 repeated bendings. Therefore, alloy nanoflakes could be a promising candidate conductive filler for flexible printing electronics, electronic packaging, and other conductive applications.
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RSC Advances
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2019
·Vol. 9
·期 34
·19501-19507
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IF 3.049
Yuqiu Shen,Zhenxing Chen,Yong Zhou,Zuomin Lei,Yi Liu,Wenchao Feng,Zhuo Zhang,Houfu Chen
Solvent-free electrically conductive composites have been applied to flexible electronics to obtain high electrical conductivity. However, some of the proposed composites have low electrical conductivities and are unable to meet the requirements of commercial printable electronics. In this study, solvent-free electrically conductive Ag/EVA (ethylene vinyl acetate) composites for paper-based printable electronics were prepared by a thermal melting method. The properties of these electrically conductive Ag/EVA composites, including particle sizes, morphologies and phase purities of the flake silver flake powders, were investigated using a particle size analyzer, scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results showed that nanometer-thick flake silver flake powders with smooth and flat surfaces were made by the nanofilm transition technique. These obtained powders were able to form smooth face-to-face contacts, which facilitated the formation of an excellent conductive network in the conductive system. Dynamic mechanical analysis (DMA) was conducted to investigate the mechanical properties of EVA and Ag/EVA composites. A Fourier transformation infra-red (FTIR) spectrometer, laser micro-Raman spectrometer and thermogravimetric analyzer were used to analyze the organic functional groups, glass transition temperatures and thermal weight losses of the EVA resin and solvent-free electrically conductive composites. The solvent-free electrically conductive Ag/EVA composite, which contained 55 wt% of the as-prepared flake silver flake powders, was found to have an extremely low volume resistivity of 1.23 × 10−4 Ω cm as well as excellent bending performance and adhesion. These features indicate the great potential of these composites for application in printed electronics.
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Journal of Materials Chemistry C
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2019
·Vol. 7
·期 24
·7219-7229
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IF 6.641
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jindi Hou,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
The reasonable design of semiconductor metal oxides modified by elemental doping and surface functionalization has been proven to be an effective method to improve the gas sensing abilities of chemiresistor-type sensors. In this work, Ni-doped In2O3 nanorods were fabricated via simple oil bath and annealing processes. To further enhance their gas sensing performances, Ag functionalization was carried out by a subsequent chemical reduction process. The experimental results reveal that these composites exhibit excellent formaldehyde sensing performance compared with pure In2O3 nanorods. In particular, 6%-Ag/Ni5.0In presents significantly enhanced gas sensing performance toward 100 ppm formaldehyde gas at a low working temperature (160 °C) with high sensitivity (123.97), fast response speed (1.45 s/58.2 s), and good selectivity and stability. Our research reveals that the improvement in sensing performance toward formaldehyde can be attributed to the large specific surface area, high relative contents of OV and OC components, electronic sensitization and the catalytic effect of Ag. The results provide an effective strategy to achieve excellent gas sensing performance for formaldehyde gas sensors.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Qi-Su Huang,Wei Wu,Wei Wei,Bing-Jie Ni
Elemental Ag 0 is well known for its remarkable catalytic and antibacterial properties, thus the regeneration of valuable Ag 0 metal from Ag + wastewater is of great significance. In this study, a novel polyethylenimine (PEI) modified potassium tungsten oxide (N-K 2 W 4 O 13 ) adsorbent was prepared for Ag + removal and reduction to Ag 0 using glutaraldehyde as crosslinking agent. XPS and FT-IR spectra verified PEI successfully anchored on the surface O and W atoms of K 2 W 4 O 13 through aldehyde bridges. The content of PEI in N-K 2 W 4 O 13 was calculated as 8.74 wt% by TG curve. A heterogeneous PEI coating was observed in the SEM and TEM images. The N-K 2 W 4 O 13 exhibited larger Ag + uptake (48.25 mg/g) than the raw K 2 W 4 O 13 (42.50 mg/g) though required a longer equilibrium time. This was due to the combined results of strong chelation and weak electrostatic repulsion that meanwhile occurring on the positive-charged surface of N-K 2 W 4 O 13 . The maximum Ag + uptake on N-K 2 W 4 O 13 was 72.5 mg/g, which was larger than many of the reported adsorbents. Furthermore, the prepared N-K 2 W 4 O 13 displayed good anti-interference toward background ions (Na + , K + ) and hold a stable Ag + removal (>95%) after five runs of recycling tests. The mechanism studies elucidated that NH/ N groups from the PEI modified N-K 2 W 4 O 13 mainly accounted for the Ag + adsorption and Ag 0 recovery in the adsorption-reduction process. Ion-exchange between Ag + and K + from the N-K 2 W 4 O 13 lattice also occurred. This work provided a facile method to synthesize a promising adsorbent for Ag + wastewater remediation and valuable Ag 0 recovery.
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CELLULOSE
·
2019
·Vol. 26
·期 6
·4191-4204
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IF 3.917
Cheng Deshan,Bai Xue,He Mantang,Wu Jihong,Yang Hongjun,Ran Jianhua,Cai Guangming,Wang Xin
Depositing anisotropic noble metal nanoparticles with high uniformity and yield on flexible substrates is the determining factor for surface enhanced Raman spectroscopy (SERS) detection. In this work, flexible, durable and sensitive SERS substrates were fabricated by in situ reduction of Ag nanoparticles on polydopamine templated cotton fabrics (CF) as catalytic hotspots to enhance the following deposition of Au nanoparticles. The coated CF were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy and X-ray diffraction to understand the surface morphology, chemical composition and crystalline structure, respectively. The SEM images indicate that the nanoparticles are dispersed evenly on the CF. 4-Mercaptobenzoic acid (4-MBA) has been used as the probe molecule to evaluate the sensitive and reproducible SERS properties of the as-fabricated SERS substrate. The as-prepared SERS substrates were demonstrated to detect carbaryl pesticides on a cucumber, and carbaryl with the concentration of as low as 10 −6 M (0.20 ppm) could be detected to ensure food safety.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
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IF 2.752
Aili Wei,Lulu Shen,Song Chen,Li Guo,Weiyi Chen
Novel cage-like porous Ag-decorated silica nanotubes (silica-Ag NTs) were synthesized as the porous silica NTs were firstly synthesized using the silk fibroin nanofibers (SF NFs) as sacrificial template via the sol-gel route and then supported the in situ decoration of Ag nanoparticles (NPs) via the hydrothermal route to derive porous silica@Ag NTs. SF NFs were prepared by electrospinning the SF solution via an electrospinning method, and then supported the self-assembly and packing of silica nanospheres when soaked in the Stöber-type sol-gel system consisting of tetraethoxysilane , water, ethanol and ammonia, and finally removed by calcination to produce the porous silica NTs. TEM and SEM observations indicated that the resultant silica NTs presented cage-like and porous hollow structure with controllable pore size from 139 ± 11 nm to 209 ± 64 nm. They induced the deposition of Ag nanoparticles (NPs) with the diameter of 5–10 nm when hydrothermally treated in the solution of AgNO 3 and played the reduction role in the conversion of AgNO 3 to Ag NPs. When exposed to the 4-nitrophenol/NaBH 4 solution, the resultant porous silica-Ag NTs showed catalytic activity for conversion of 4-nitrophneol to 4-aminophenol.
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