Polymers
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2018
·Vol. 10
·期 6
·586
·
IF 2.935
Xizi Chen,Fei Liang,Wenzhong Lu,Zheng Jin,Yifei Zhao,Ming Fu
In this paper, nanocomposites that contain core-shell Ag/TiO2particles as the filler and polytetrafluoroethylene (PTFE) as the matrix were investigated. Two surfactants, namely octyl phosphonic acid (OPA) and pentafluorobenzyl phosphonic acid (PFBPA), were applied to modify Ag/TiO2fillers for uniform dispersion in the matrix. Fourier transform infrared spectroscopy analysis of bonds between the TiO2shells and the phosphonic modifiers shows Ti–O–P chemical bonding between the Ag/TiO2fillers and the modifiers. Thermogravimetric analysis results show a superior adsorption effect of PFBPA over OPA on the Ag/TiO2filler surface at the same weight percentage. For nanocomposites that contain modified Ag/TiO2nanoparticles, the loss was reduced despite the high permittivity at the same loading. The permittivity of the nanocomposites by PFBPA is larger than that of OPA, because the more uniform dispersion of inorganic particles in the PTFE matrix enhances the interfacial polarization effect. The mechanism of enhanced dielectric performance was studied and discussed.Keywords:core–shell structure;interfacial modification;dielectric properties;nanocomposites
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shen-wei Bai,Hui Mei,Lai-fei Cheng
In this article, we report an ultra-thin shell of MoS 2 (3–7 nm) deposited on Ag nanowires (AgNWs) to form a core-shell hybrid system by the sol-gol method. Since AgNWs is easy to be oxidized, a protection shell is necessary. Compared with commonly used hydrothermal method for MoS 2 , it could produce a more thinner and homogeneous shell with the least 3 nm thickness of MoS 2 shell, which is a breaking-through of making MoS 2 shell based on noble nanoparticles . Results show that the obtained hybrid system has great value on surface-enhanced Raman spectroscopy (SERS) due to surface plasmon resonance (SPR) effect of Ag nanowires. Ultra-thin MoS 2 shell was suitable for protecting AgNWs and simultaneously had excellent SERS signature, and this effect was rare for MoS 2 shells. By decreasing the thickness of MoS 2 film from 7 to 3 nm, the intensity of SERS signal could be enhanced. It was observed that the microstructure of this AgNWs@MoS 2 system consist of crystal AgNWs surrounded by crystal MoS 2 . AgNWs@MoS 2 showed excellent SERS effect with Rhodamine 6G (R6G) and N719 dyes, the detection limit could reach to 10 −5 M. Finally for comparison, local electromagnetic field enhancement of AgNWs@SiO 2 was also simulated to indicate AgNWs@MoS 2 better.
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AUSTRALIAN JOURNAL OF CHEMISTRY
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2018
·Vol. 72
·期 3
·200-205
·
IF 1.059
Jianhua Ge,Yuchong Chen,Jing Xu,Yujie Liu,Long Zhang,Fugeng Zha
The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yong Zuo,Jinjun Chen,Haocheng Yang,Miao Zhang,Yanfen Wang,Gang He,Zhaoqi Sun
In this paper, highly ordered titanium dioxide nanorod (TNR) arrays decorated with Ag-Ag 2 S quantum-dots (QDs) were synthesized on FTO substrate through hydrothermal treatment and in-situ vulcanization . The content of Ag 2 S QDs on Ag/TNR was controlled by changing the immersion time of Ag/TNR in the N-N-dimethyl formamide (DMF) solution containing dissolved sulfur element. The morphology, structure, composition and optical, photoelectric and photocatalytic properties of QDs/TNR arrays were studied in detail. In the visible range, the QDs/TNR array with a soaking time of 12 h exhibits the maximal photocurrent density (0.082 mA/cm 2 ) and photodegradation rate (62.2%), which is 5.5 and 1.85 times higher than that of pure TNR. The improvement of these properties could be attributed to synergy effect between Ag and Ag 2 S materials. That is, Ag QDs can stably capture and transmit photo-generated electrons from the TNR surface, whereas the Ag 2 S promoter is regarded as the interface active sites to enhance photocatalytic reactions. Therefore, the synergistic effect of Ag-Ag 2 S can significantly enhance the photoelectrochemical and photocatalytic properties of the TNR arrays.
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JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Huyan Shi,Fu Liu,Lixin Xue
This work describes the fabrication and characterization of antibacterial poly(vinylidene fluoride) (PVDF) hollow fibre membranes via phase inversion using dry-jet wet-spinning technique. Ag-loaded NaY zeolites were particularly synthesized and then doped with PVDF spinning solution to produce a novel antibacterial hollow fibre with enhanced antibacterial efficiency. The morphologies, crystal structures, and Ag + loading of synthesized Ag-loaded NaY zeolites were analyzed by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and inductively coupled plasma-atomic emission spectrometry (ICP-AES), respectively. The antibacterial efficiencies of the prepared hollow fibre membranes against Escherichia coli ( E. coli ) were evaluated by halo zone test, E. coli suspension filtration test and adhesion test. The surface morphologies , pure water flux, hydrophilicity, tensile strength , through-pore size, resistance to BSA of antibacterial PVDF hollow fibre membrane were also investigated. All results demonstrated that PVDF hollow fibre fabricated by doping Ag-loaded zeolites showed excellent antibacterial property, high permeability and mechanical strength , indicating the promising application as the antibacterial ultra-filtration membranes.
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JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 45
·24132-24138
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IF 5.968
Hui Yang,Yan Liu,Qianhong Shen,Liangfu Chen,Wenhui You,Xinmin Wang,Jiansong Sheng
A novel method was proposed to fabricate a mesoporous silica microcapsule with Ag nanoparticles (AgNPs) loaded onto the interior wall of a mesoporous silica shell. The mesoporous silica microcapsule-supported AgNPs (denoted as AgNPs@silica microcapsule) was fabricated via a two-step process: (i) Ag+ ions were adsorbed on the surface of monodisperse sulfonated polystyrene (PS) beads via electrostatic interaction, and then reduced and protected by polyvinylpyrrolidone (PVP) to obtain PS–Ag composite spheres. (ii) Silica colloids generated by the hydrolysis and polymerization of tetraethoxysilane (TEOS) were assembled on the PS–Ag composite spheres via hydrogen bond forces to form a silica shell, followed by the removal of the PS core and PVP through calcinations. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffractometery (XRD) were adopted to analyze the as-prepared AgNPs@silica microcapsule. Furthermore, the antibacterial properties of this unique structured material were investigated as well. The results show that the AgNPs, with the form of elementary substance, dispersely load onto the interior wall of silica shell, and the shell is composed of a single layer of interconnected silica particles and mesopores. This unique structure can effectively avoid the aggregation problem existing in traditional Ag colloid system and slowly release Ag+ ions, which will diffuse to the external medium through the mesopore channels in the shell, inducing antibacterial activity. The antibacterial activity against Escherichia coli (E. coli) can reach up to 99.8% and, more importantly, can maintain a high level for long periods over two months. The AgNPs@silica microcapsule can combine the advantages of high surface area materials and large-scale materials, achieving both high antibacterial activity and easy recycling characteristics, thus showing its great potential as an antimicrobial agent.
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BIOSENSORS & BIOELECTRONICS
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2014
·
IF 6.451
Hui Fang,Chang Xing Zhang,Luo Liu,Yong Mei Zhao,Hai Jun Xu
Multifunctional Ag nanoparticle-decorated TiO 2 nanorod arrays were prepared by two simple processes. TiO 2 nanorod arrays were first fabricated by the hydrothermal route and then Ag nanoparticles were decorated on the nanorods by the chemical reduction impregnation method. Three-dimensional Ag/TiO 2 arrays were used as an active substrate for surface-enhanced Raman scattering (SERS). The results show that the detection limit for rhodamine 6G (R6G) was as low as 10 −7 M and the Raman enhancement factor was as large as 10 5 . After calibrating the Raman peak intensities of R6G, it could be quantitatively detected. More importantly, the photocatalytic activity of TiO 2 provides a self-cleaning capability to the SERS substrate, which can be recycled and used to degrade many Ag surface adsorbates such as R6G, methyl orange, Congo red, and methylene blue after exposure to visible light. The absorbed small molecules can all be rapidly and completely removed from the SERS substrate, which has been successfully reused four times without a decrease in accuracy or sensitivity. Our results reveal that the unique recyclable property not only paves a new way to solve the single-use problem of traditional SERS substrates but also provides more SERS platforms for multiple detections of other organic molecular species.
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RSC Advances
·
2014
·Vol. 4
·期 88
·47781-47787
·
IF 3.708
Man Wang,Xuefeng Xu,Bing Ma,Yanyan Pei,Changchun Ai,Liangjie Yuan
Here we present a cheap alternative for the fabrication of conductive line patterns printed on a flexible PI substrate at intermediate temperature. In order to achieve this purpose, a low-cost and water-soluble screen printing conductive paste was prepared, with micron-SiO2@nano-Ag particles as the conductive filler. Variations in the filling content of micron-SiO2@nano-Ag, the addition of the coupling agent, curing temperature and time can remarkably affect the electrical and mechanical performance of the conductive paste. The optimal sheet resistance (at 62 mΩ □−1) and mechanical performance of the paste were achieved under the curing conditions of 140 °C for 30 min, with the filling content of 53.6 wt% of micron-SiO2@nano-Ag (32.4 wt% of Ag) and 1.0 wt% of the coupling agent APTES. The conductive mechanism of the paste was discussed according to the “percolation theory”. The conductive line patterns fabricated through silk-screen printing were applied to be linked with a LED into a circuit, suggesting that the paste would have a potential application in electronic devices.
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CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Yao Shi,Xiao-Liang Zhang,Gang Feng,Xiangshu Chen,Zhang-Hui Lu
Ag–SiO 2 nanocomposites (NCs) with “plum-pudding” structure have been synthesized using a facile reverse micelle method. The as-synthesized Ag–SiO 2 NCs were calcined at 623 K to remove the surfactants and then characterized by XRD , FE-SEM, TEM, EDX, ICP and N 2 adsorption–desorption. The obtained results demonstrated that many ultrafine Ag nanoparticles (NPs) with size of ~2 nm are well dispersed in each SiO 2 nanosphere (28 nm). In comparison with free Ag NPs and SiO 2 supported Ag NPs, the Ag–SiO 2 NCs exhibited a better catalytic activity for the reduction of 4-nitrophenol with a turnover frequency of 489 h −1 at room temperature. Ag–SiO 2 NCs also displayed a superior catalytic activity for hydrogenation of 2-NP and 3-NP. The activation energy of Ag–SiO 2 NCs was estimated to be about 34.4 kJ mol −1 , which was lower than most of the reported values for the same reaction using Ag-based catalysts, indicating the superior catalytic performance of these plum-pudding structured catalysts.
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SOLAR ENERGY
·
2015
·
IF 3.469
Haoran Yan,Jianxin Wang,Bo Feng,Ke Duan,Jie Weng
In the present work, a novel multistage structure dye-sensitized solar cell (DSSC), which consists of Ag nanowires (AgNWs), TiO 2 nanoparticles and graphene wrapped TiO 2 mesoporous microspheres (GTMs), was fabricated by using simple spin coating steps. The aim of this study was to modify the bandgap of GTMs by using graphene so as to promote the light absorption of GTMs in the visible light region and in turn to improve the power conversion efficiency (PCE) of DSSCs. Additionally, graphene and AgNWs can enhance the electron transfer in the DSSC to further improve the PCE of DSSCs. The effect of AgNWs and GTMs light scatting layer on the photovoltaic performance of DSSCs was investigated. The results showed that a PCE of 7.42% was achieved for the DSSC co-modified by GTMs and AgNWs, which was about twice as much as that for the DSSCs only with a TiO 2 nanoparticle layer (with a PCE of 3.53%). This present study might open a new avenue for the improvement of the PCE of DSSCs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2015
·
IF 2.752
Na Zhao,Siwen Li,Xin Zhang,Xinyue Huang,Jinyi Wang,Ruimin Gao,Jianshe Zhao,Junlong Wang
Photocatalytic oxidative desulfurization of dibenzothiophene (DBT) with H 2 O 2 (30%) and Ag/ALa 4 Ti 4 O 15 (A = Ca, Sr and Ba) as the photocatalysts were studied. Ag cocatalyst-loaded ALa 4 Ti 4 O 15 (A = Ca, Sr and Ba) were synthesized by incipient wetness. Reaction time, temperature and the amount of hydrogen peroxide were investigated as the important parameters for optimization of the reaction and a potential removal mechanism of photocatalytic oxidation was proposed. Ag (2 wt%)/CaLa 4 Ti 4 O 15 and Ag (1 wt%)/BaLa 4 Ti 4 O 15 were found to give remarkable catalytic activity and high selectivity for catalytic experiments. Actually, 99.0% and 98.0% of DBT were converted respectively according to the desulfurization tests. Moreover, these two catalysts were characterized by infrared spectroscopy (IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and X-ray photoelectron spectrum (XPS).
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Nanomaterials
·
2015
·Vol. 5
·期 2
·1124-1135
·
IF 2.076
Yongde Meng
Ag nanoparticles were synthesized by usingFicus altissimaBlumeleaf extract as a reducing agent at room temperature. The resulting Ag nanoparticles/PVA mixture was employed to create Ag nanoparticles/PVA (polyvinyl alcohol) hybrid nanofibers via an electrospinning technique. The obtained nanofibers were confirmed by means of UV-Vis spectroscopy, The X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and then tested to catalyze KBH4reduction of methylene blue (MB). The catalytic results demonstrate that the MB can be reduced completely within 15 min. In addition, the Ag nanoparticles/PVA hybrid nanofibers show reusability for three cycles with no obvious losses in degradation ratio of the MB.Keywords:nanofiber;catalytic activity
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