RSC Advances
·
2015
·Vol. 5
·期 75
·61239-61248
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IF 3.84
Jun Liu,Wei Wu,Qingyong Tian,Shuanglei Yang,Lingling Sun,Xiangheng Xiao,Feng Ren,Changzhong Jiang,Vellaisamy A. L. Roy
Plasmonic photocatalysts coupled with semiconductors are one of the most popular combinations in environmental remediation applications. In this regard, a novel tube-like α-Fe2O3@Ag/AgCl hybrid structure is fabricated by anchoring Ag/AgCl hybrid nanoparticles on the surface of α-Fe2O3 short nanotubes (SNTs) by a step-by-step strategy. Firstly, the monodispersed α-Fe2O3 SNTs have been synthesized via an anion-assisted hydrothermal process followed by the loading of Ag nanoparticles on the surface of α-Fe2O3 SNTs through the classic silver mirror reaction mechanism. From in situ oxidation of Ag nanoparticles, the final product α-Fe2O3@Ag/AgCl heterostructures has been obtained. We study the morphology, composition, and photocatalytic properties of the as obtained tube-like α-Fe2O3@Ag/AgCl nano-heterostructures. The photocatalytic activities of as obtained photocatalysts have been tested by the degradation of organic dye Rhodamine B (RhB) under simulated sunlight (UV + visible light), visible light and UV light irradiation. The main reason for the enhanced photocatalytic performance is attributed to the broad spectral response from the combination of narrow/wide bandgap semiconductors with metallic Ag nanoparticles and efficient charge transfer from plasmon-excited Ag nanoparticles to α-Fe2O3 and AgCl. Finally, this hybrid structure provides a roadmap for the controlled synthesis of plasmonic photocatalysts with excellent properties, and can be used for practical application in environmental issues.
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JOURNAL OF MEMBRANE SCIENCE
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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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RSC Advances
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2015
·Vol. 5
·期 117
·96483-96487
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IF 3.84
Ruike Li,Meicheng Li,Yingfeng Li,Pengfei Fu,Younan Luo,Rui Huang,Dandan Song,Joseph Michel Mbengue
Metal-assisted chemical etching is a very popular method of fabricating silicon nanostructures. For the dissolution and recrystallization of Ag and the inertia of Au, we present a co-catalytic mechanism of silicon etching using non-overlapping Au and Ag nanofilms. Meanwhile, two kinds of novel nanostructures are obtained by changing the relative positions of the two nanofilms. The results show that regardless of whether the Ag or Au nanofilm is the upper layer, the Ag nanofilm will first react to etch the silicon substrate into silicon nanowires (Si NWs). Afterwards, the Au nanofilm will re-etch the Si NWs into thick pillars (Ag upper) or ultrathin porous Si NWs (Au upper). It should be noted that the vertical etching rates of the two layers are not observably different, in contrast to when the Au and Ag nanofilms are used separately, in which the vertical etching rate of the Ag nanofilm is much higher than that of the Au nanofilm. This occurs because the subsequent re-etching process by the Au nanofilm is conducted at multiple surfaces because Au can generate excessive holes during the decomposition of hydrogen peroxide. Furthermore, this study presents a feasible method for the fabrication of individual, thick (∼200 nm) silicon pillars and ultrathin (∼25 nm) porous Si NWs. These insights are significant for the syntheses of many nanostructures.
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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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PubMed
高影响因子
TALANTA
·
2013
·
IF 3.498
Yurong Tang,Yu Zhang,Yingying Su,Yi Lv
Ag nanoclusters (NCs) possessed distinct physical and chemical attributes that made them excellent scaffolds for the development of novel bio-analytical methodology. In the present work, a green approach for the preparation of Ag nanoclusters (NCs) was proposed on the basis of templated polyethyleneimine (PEI) assisted in-situ reductive crystallization of Ag (I), and then a sensitive resonance light scattering bioassay for the determination of heparin was established on the basis of the enhanced resonance light scattering of the PEI-capped Ag NCs during the presence of heparin. Further investigation indicated that the molecular weight of PEI, the PEI/Ag (I) ratio and the pH value of reaction conditions had great influence on the formation of Ag NCs, which was directly correlated to resonance light scattering. The bioassay allows sensitive and selective detection of heparin with a detection limit of 27.5 nM, and successfully applied for the determination of heparin in human serum samples.
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Nano Research
·
2014
·Vol. 7
·期 8
·1177-1187
·
IF 6.963
Huang Zhulin,Meng Guowen,Huang Qing,Chen Bin,Zhou Fei,Hu Xiaoye,Qian Yiwu,Tang Haibin,Han Fangming,Chu Zhaoqin
Surface-enhanced Raman spectroscopy (SERS) is a fast analytical technique for trace chemicals; however, it requires the active SERS-substrates to adsorb analytes, thus limiting target species to those with the desired affinity for substrates. Here we present networked polyacrylic acid sodium salt (PAAS) film entrapped Ag-nanocubes (denoted as Ag-nanocubes@PAAS) as an effective SERS-substrate for analytes with and without high affinity. Once the analyte aqueous solution is cast on the dry Ag-nanocubes@PAAS substrate, the bibulous PAAS becomes swollen forcing the Ag-nanocubes loose, while the analytes diffuse in the interstices among the Ag-nanocubes. When dried, the PAAS shrinks and pulls the Ag-nanocubes back to their previous aggregated state, while the PAAS network “detains” the analytes in the small gaps between the Ag-nanocubes for SERS detection. The strategy has been proven effective for not only singleanalytes but also multi-analytes without strong affinity for Ag, showing its potential in SERS-based simultaneous multi-analyte detection of both adsorbable and non-adsorbable pollutants in the environment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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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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BIOSENSORS & BIOELECTRONICS
·
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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Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 42
·13128-13138
·
IF 0
Juan Zhou,Feng Ren,Shaofeng Zhang,Wei Wu,Xiangheng Xiao,Ying Liu,Changzhong Jiang
Tailorable synthesis of plasmon enhanced catalysts with high solar-light harvesting and energy-conversion efficiency has attracted wide interest due to its scientific and technological importance. In this paper, novel SiO2–Ag–SiO2–TiO2 multi-shell photocatalysts with wide-spectral-response were systematically designed and controllably synthesized, where the SiO2 spheres were used as the cores, and the SiO2 interlayers coated on the Ag nanoparticle (NP) shells were used to separate the Ag from the TiO2 shell. The structures of the SiO2–Ag–SiO2–TiO2 multi-shell photocatalysts can be tailored by changing the thickness of SiO2 interlayers from 1 to 2, 5, 8, 12, and 20 nm, while the anatase N-doped TiO2 shells with visible light response are maintained at a thickness of 20 nm. The photocatalytic activity tests show that the enhanced photocatalytic efficiency under both ultraviolet (UV) and visible light irradiation is related to the existence of Ag NP shells and the thickness of SiO2 interlayers. The complicated coupling mechanisms between TiO2 and a plasmon are systematically discussed, and a clear physical picture for the complicated coupling processes is presented. The main reasons for the enhancement of the photocatalytic activity of the SiO2–Ag–SiO2–TiO2 multi-shell structures are the localized surface plasmon resonance (LSPR) effect and scattering effect induced by Ag NPs.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Wen Shen,Bin Wu,Fan Liao,Binbin Jiang,Mingwang Shao
In recent years, platinum-based catalysts are the most promising candidates for hydrogen evolution reaction (HER). Decrease of the Pt usage is an effective way to obtain low-cost hydrogen production. In order to achieve this goal, we synthesized Pt-Ag/SiNW composites with different dosages of Pt, using inexpensive Ag as a co-catalyst and SiNWs as carriers, and tested their catalytic performance in HER. The results showed that the optimal composition of Pt: Ag: Si = 4.1: 21.5: 74.4 in mass ratio. With such a low amount of Pt, the Pt-Ag/SiNW catalyst exhibited exciting HER performance, whose turnover frequency is 6.3H 2 Pt −1 s −1 at −0.2 V vs. RHE, 2.7 times as large as that of 40 wt% Pt/C. This design greatly increased the utilization ratio of Pt, which may open a new way for preparation of other Pt-based catalysts.
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