APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 33
·期 3
·e4683
·
IF 3.581
Jiang Li,Xiaolu Zhu,Fengxian Qiu,Tao Zhang,Fengping Hu,Xiaoming Peng
Introducing plasmonic metals into semiconductor materials has been proven to be an attractive strategy for enhancing photocatalytic activity in the visible region. In this work, a novel and efficient Ag/Ag 2 WO 4 /g-C 3 N 4 (AACN) ternary plasmonic photocatalyst was successfully synthesized using a facile one-step in situ hydrothermal method. The composition, structure, morphology and optical absorption properties of AACN were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–visible diffuse reflectance spectroscopy, respectively. Photocatalytic performance of AACN was evaluated via rhodamine B and tetracycline degradation. The results indicated that AACN had excellent photocatalytic performance for rhodamine B degradation with a rate constant of 0.0125 min −1 , which was higher than those of Ag 2 WO 4 and Ag/Ag 2 WO 4 . Characterization and photocatalytic tests showed that the strong coupling effect between the Ag/Ag 2 WO 4 nanoparticles and the exfoliated ultrathin g-C 3 N 4 nanosheets was superior for visible-light responsivity and reduced the recombination rate of photogenerated electrons and holes. A proposed mechanism is also discussed according to the band energy structure and the experimental results.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yan Yang,Zhijie Zhang,Yali He,Zhihua Wang,Yanbao Zhao,Lei Sun
In order to develop a novel method for bacteria detection, Ag@TiO 2 electrospinning Nanofibrous felts have been fabricated by in situ decoration of size tunable Ag nanoparticles on anatase TiO 2 nanofibers. The morphologies and structures of the as-prepared Ag@TiO 2 electrospinning nanofibrous felts were characterized by techniques of scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction. The result show that Ag NPs were uniformly deposited on the surfaces of TiO 2 nanofibers, especially when the deposition time in Tollens’ reagent was 10 min. The free-standing composite nanofibrous felts processes superb performance of surface enhanced Raman scattering, which was demonstrated by small probe mecules of 4-mercaptobenzoic acid and 4-mercaptophenol, and the lowest detection limit was near to10 −9 mol/L. More importantly, the as-fabricated Ag@TiO 2 nanofibrous felts as SERS substrate can detect biomacromolecules such as bacteria of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) directly without previous bacteria-aptamer conjugation as the traditonal process. In addition, the composite nanofibrous felts also show outstanding antimicrobial activities against both Gram-negative of E. coli and Gram-positive of S. aureus , evaluated by method of absorption and microscopic observation. The results show that the bacteriostasis rate is reached to 99%, especially significant for E. coli . The free-standing, high porous, and flexible substrate of Ag@TiO 2 electrospun nanofibrous membranes have potential application in versatile fields such as microorganism sensors and water purifier.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Rongrong Li,Wubing Yao,Yanxian Jin,Wenping Jia,Xiaoying Chen,Jingjing Chen,Jianli Zheng,Yuan Hu,Deman Han,Jia Zhao
Hydrocinnamaldehyde (HCAL) is a crucial intermediate in the manufacture of perfumes and pharmaceuticals, but highly selective hydrogenation of cinnamaldehyde (CALD) to hydrocinnamaldehyde with a good conversion rate is a challenging. We report that the incorporation of Ag into Pd-based catalysts promotes their catalytic activity and HCAL selectivity (HCAL selectivity of 98.6% with >99.9% CALD conversion for Pd-0.3Ag/MCM-41) for CALD hydrogenation compared to those of catalysts with no Ag, e.g., HCAL selectivity of 84.5% for Pd/MCM-41and 77.3% for Pd/AC (activated carbon). The Pd-0.3Ag/MCM-41 catalyst shows an outstanding stability during five cycles of use. The excellent performance of the Pd-0.3Ag/MCM-41 catalyst in CALD hydrogenation is due to the ultra-small size of the Pd nanoparticles (Pd-Ag alloy, a geometric and electronic modification of Pd).
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Jian Zhu,Xiao-Hong Chen,Jian-Jun Li,Jun-Wu Zhao
In this work, the novel tetrapod gold nanostars with four specific numbers of sharp tips were synthesized with good uniformity, high yield and chemical stability. The size of tetrapod gold nanostars has been increased effectively by increasing the amount of HAuCl 4 or DEA added to the reaction solution, and the corresponding in-plane localized surface plasmon resonance (LSPR) band can shift from 700 to 1100 nm. In order to combine the advantages of different metals, the Ag-coated tetrapod gold nanostars were prepared with different Ag coating thicknesses by increasing the volume of AgNO 3 . With the increase of Ag coating thickness, the morphology of the nanoparticles has changed from gold nanostars with four sharp tips to bimetallic cuboids with four sharp tips and finally to crore-shell cuboids completely. The surface-enhanced Raman scattering (SERS) activity of Ag-coated tetrapod gold nanostars has also been improved with the different Ag coating thicknesses. Combined the tip effect and the enhancement effect of Ag, the SERS activity has the strongest enhancement when the four sharp tips of tetrapod gold nanostars are not completely coated by the Ag layer but still exposed to the outsides. For tetrapod gold nanostars with larger size to grow Ag-coated tetrapod gold nanostars, the bimetallic cuboids with four sharp tips nanostructure have the biggest SERS enhancement factor (EF) of 1.73 × 10 6 for Rhodamine 6G (R6G), making it an ideal candidate in SERS-based sensing application.
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2018
·期 24
·2835-2840
·
IF 2.507
Qijun Dai,Lu Li,Chungang Wang,Changli Lv,Zhongmin Su,Fang Chai
Graphical Thin films of Ag microflowers (MFs) were fabricated on substrates. SEM studies revealed that the Ag MFs are assembled from thin nanosheets composed of Ag nanoparticles. The potential of the film as a catalyst in the reduction of nitrophenols and as a substrate for surface-enhanced Raman scattering was investigated. Three-dimensional flowerlike Ag microstructures were assembled in situ on a substrate to fabricate Ag microflower (Ag MF) films. The morphology and size of the Ag MFs can be easily controlled by varying the reaction time. The mechanism of growth of Ag MFs was investigated by SEM. The shape evolution revealed that the Ag MFs are assembled from thin nanosheets composed of Ag nanoparticles (NPs), and the elemental composition of the NPs was evidenced by energy-dispersive X-ray spectroscopic analysis. The potential of the film as a catalyst in the reduction of nitrophenols was investigated. The reusability of the catalyst was estimated by recycling catalysis of 4-nitrophenol. Moreover, the Ag MF film could be used as a versatile substrate for surface-enhanced Raman scattering (SERS) for detection of Rhodamine 6G with a detection limit as low as 1 × 10 –7 m . The results demonstrated that the Ag MF film exhibits excellent SERS enhancement ability and catalytic activity.
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INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Lei Ji,Xifeng Shi,Abdullah M. Asiri,Baozhan Zheng,Xuping Sun
Electrochemical reduction has been regarded as a sustainable strategy to tackle energy-intensive operations by the Haber–Bosch process achieving catalytic conversion of N2 to NH3 under mild conditions. However, the challenge of N2 electroconversion emphasizes the requirement of efficient electrocatalysts. In this paper, we report the development of porous bromide-derived Ag film (BD-Ag/AF) as an efficient electrocatalyst for N2 reduction reaction. During electrochemical test, Br– anions are released and adsorbed onto the surfaces of the electrode, suppressing hydrogen evolution reaction. Such BD-Ag/AF shows a high Faradaic efficiency of 7.36% at −0.6 V vs reversible hydrogen electrode in 0.1 M Na2SO4, which is higher than that (0.38%) of porous Ag film without Br– anions. Moreover, it exhibits excellent long-term electrochemical durability.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jing Zou,Dongpeng Mao,Andrew Thye Shen Wee,Jizhou Jiang
Ultrathin (UT) g-C 3 N 4 with a thickness of ∼2 nm was prepared via a facile thermal exfoliation method using bulk g-C 3 N 4 as precursor. The UT-g-C 3 N 4 sample obtained exhibited a large specific surface area of 192.9 m 2 ·g −1 . The UT-g-C 3 N 4 /Ag hybrids were fabricated by a photo-assisted reduction technique. The morphology, microstructure and composition of the UT-g-C 3 N 4 /Ag hybrids were systematically characterized by transmission electron microscopy (TEM), aberration-corrected scanning transmission electron microscopy (STEM), STEM-energy dispersive X-ray (EDX) spectrometry, atomic force microscopy (AFM), X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS). Based on electrochemical impedance spectroscopy (EIS) results, the optimal UT-g-C 3 N 4 /Ag hybrids displayed a faster electron transfer rate in comparison of UT-g-C 3 N 4 and bulk g-C 3 N 4 . Moreover, in the presence of a phosphate buffer solution (pH = 6.0), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) results showed that the UT-g-C 3 N 4 /Ag hybrids coated on glassy carbon electrode (denoted as UT-g-C 3 N 4 /Ag/GCE) exhibited excellent electrochemical properties for l -tyrosine detection. It is observed that the electrochemical response of was linear in the concentration range of 1.00 × 10 −6 to 1.50 × 10 −4 mol L −1 with a limit of detection (S/N = 3) of 1.40 × 10 −7 mol L −1 , superior to the other reported sensors. The developed UT-g-C 3 N 4 /Ag/GCE sensor was employed for l -tyrosine detection in commercial l -tyrosine tablet samples, and the recovery of 97.2–99.3% was observed. This proposed g-C 3 N 4 -based electrochemical sensor provides a rapid and sensitive sensing method for l -tyrosine detection in real samples.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Qiaoyue Xi,Ge Gao,Manyu Jin,Yanqun Zhang,Hua Zhou,Cunqi Wu,Yongxia Zhao,Lidan Wang,Pengran Guo,Jingwei Xu
A novel ternary photocatalytic nanocomposite, Ag–Cu 2 O/C 3 N 4 , has been successfully synthesized via a facile two-step reduction procedure at room temperature, wherein Ag nanoparticles are directly growing on the surface of Cu 2 O supported by C 3 N 4 nanosheets. The resulting ternary Ag–Cu 2 O/C 3 N 4 photocatalyst exhibits enhanced photocatalytic activity towards methyl orange (MO) degradation compared with its counterparts (Cu 2 O, spherical Ag–Cu 2 O and Cu 2 O/C 3 N 4 ), demonstrating a removal rate of MO up to 95.7% within 30 min. The enhanced photocatalytic activity can be ascribed to the following factors: (1) the surface plasmon resonance effect of Ag nanoparticles broadening the visible light response of Cu 2 O; (2) the introduction of C 3 N 4 functioning not only as a fast electron delivery but also a fine stabilizer to prevent the Ag–Cu 2 O composite from agglomeration. Mechanism studies reveal that MO is cracked into smaller fragments and the h + is the main reactive species participating in the photocatalytic process. Moreover, the Ag–Cu 2 O/C 3 N 4 photocatalyst also shows high photodegradation ability for another two representative azo dyes, acid orange II and congo red. This study demonstrates the potential of Ag–Cu 2 O/C 3 N 4 in the degradation of azo dyes and also provides a guide to design of Cu 2 O-based ternary photocatalysts for further wastewater remediation.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 6
·1-10
·
IF 2.009
Wang Wenfang,Liu Jing,Li Xia,Jiang Qinglin,Xu Jingkun,Luo Chan,Liu Peipei,Tan Rongri,Du Yukou,Jiang Fengxing
One-dimensional silver telluride nanowires (NWs) as potential thermoelectric materials have been studied extensively. At present, most of the efforts are focused on p-type silver telluride, while limited works have been achieved on the preparation of n-type silver telluride. Herein, we prepared n-type Te/Ag 2 Te NWs by galvanic exchange reaction and fabricated a nanofilm. As a simple and cost-effective method, galvanic exchange reaction was employed to prepare n-type Te/Ag 2 Te NWs with obtained Seebeck coefficient of − 93.98 μV K −1 . The nanostructure and chemical composition as well as structural phase transition of as-prepared n-type Te/Ag 2 Te NWs were characterized and discussed. Besides, the thermoelectric thin film device consisting of n-type Te/Ag 2 Te nanofilms and p-type Ag-doped Te nanofilms obtained by one-step hydrothermal method was assembled and exhibited accessible output voltage as 65 mV at the 75 K temperature difference, which may provide the fundament for the development of inorganic thermoelectric nanofilm device.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Mingpeng Chen,Dongming Zhang,Jicu Hu,Huapeng Wang,Yumin Zhang,Kejin Li,Qian Rong,Shiqiang Zhou,Jin Zhang,Zhongqi Zhu,Qingju Liu
Highly sensitive and selective detection against toluene gas remains a tremendous challenge in gas sensor applications . In this work, a series of molecular imprinted Ag-LaFeO 3 nanoparticles (IAL NPs) were synthesized in a microwave-assisted colloidal route. Especially, the one prepared with optimal amount of imprint molecules (IAL-2 NPs) have a response of 24.0 to 5 ppm toluene at the optimum working temperature of 215 °C with negligible responses to the other test gases, exhibiting enhanced gas sensing properties for toluene gas at a relatively low working temperature. The improved performance can be attributed to the favorable effect of microwave radiation, the molecular imprinting structure and the sensitization of Ag, which illuminates that IAL-2 NPs is a potential candidate for toluene detection.
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ANALYST
·
2018
·Vol. 144
·期 2
·521-529
·
IF 3.864
Yuhua Dong,Chengqian Duan,Qinglin Sheng,Jianbin Zheng
In this work, a novel non-enzymatic hydrogen peroxide sensor, Ag@zeolitic imidazolate framework-67 (Ag@ZIF-67)/glassy carbon electrode (GCE), was fabricated by a simple method at room temperature. The morphology and structure of Ag@ZIF-67 were investigated by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, atomic absorption spectrophotometry, and N2 absorption isotherms, which indicated that core–shell Ag@ZIF-67 was successfully synthesized with a porous rhombic dodecahedron structure. Electrochemical investigations demonstrated that the Ag@ZIF-67/GCE had strong electrocatalytic activity towards hydrogen peroxide reduction with a low detection limit of 1.5 μM (S/N = 3), a fast response time of 3 s, and three different linear relationships in the ranges of 5.0 μM–275 μM, 775 μM–2775 μM, and 4775 μM–16 775 μM with sensitivities of 27 μA mM−1 cm−2, 13 μA mM−1 cm−2, and 5.3 μA mM−1 cm−2, respectively. Moreover, the fabricated sensor exhibited an excellent recovery rate in real sample analysis of medical hydrogen peroxide disinfectant. These results proved that Ag@ZIF-67/GCE is an effective electrochemical sensor for detecting hydrogen peroxide.
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Journal of Energy Storage
·
2018
·
IF 0
Yuan Wu,Guorong Chen,Zhuyi Wang,Yin Zhao,Liyi Shi,Jiefang Zhu,Meihong Zhang,Rongrong Jia,Shuai Yuan
Poor intrinsic electrical conductivity as well as considerable volume change during lithium alloying/dealloying process has been a critical defect for high theoretical capacity silicon-based anodes. In our work, we demonstrate the synthesis design of multiscale recombined dendritic Si/Ag/C anode for high energy density LIBs via compositing bulky silicon with uniformly distributed Ag NPs, followed by a carbon source PDA (polydopamine) coating step. Here Ag NPs are generated by an in situ redox reaction between Ag + and PDA, no need for additional reducing agents. According to the characterization analysis, the robust porous Si/Ag/C structure can provide channels for fast Li + diffusion and electron conduction, promoting the formation of a thinner and more stable SEI film. As a result, the Si/Ag/C composite anode still yields a relatively high residual capacity of 1422.1 mAh g −1 after 100 cycles at 0.2 A g −1 . In addition, it remains 633.1 mAh g −1 after 500 cycles at a high current density of 8 A g −1 .
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