JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 4
·2975-2989
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IF 2.993
Zhang Yuheng,Gong Mindong,Liu Xi,Ji Lijun,Yang Zhenglong,Zhu Xiashi
Titanium oxide (TiO 2 ) has been widely investigated as a photocatalytic material for degradation of organic pollutant in waste water. However, nanosized granular TiO 2 nanoparticles are hard to be recycled and re-utilized in water and many cause secondary pollution of water. Hence, we constructed a foam-like photocatalyst, which was composed of carbonaceous support: activated carbon nanotube foams and Ag-doped TiO 2 nanoparticles through a method of a template synthesis and carbonization strategy. The as-prepared photocatalyst evidenced to be hierarchical macroporous and mesoporous and exhibited remarkable photocatalytic performance toward the degradation of unsymmetrical dimethylhydrazine under UV and visible light. The structure characterization and photocatalytic performance investigation confirmed that the enhanced photoresponse was attributed to the high efficiency of charge separation and the surface plasmon resonance effect of metallic Ag. The adsorption synergetic effect of the hierarchical porous structure also played an important role in photodegradation. The as-prepared photocatalyst showed great potential in the treatment of waste water containing organic pollutant.
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SOLID STATE SCIENCES
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2019
·
IF 2.155
Yunfang Huang,Hui Xu,Dan Luo,Yuezhu Zhao,Yu Fang,Yuelin Wei,Leqing Fan,Jihuai Wu
Full-spectrum-responsive Ag/Bi/BiOCl hierarchical micro-flower heterojunction via a facile in-situ solvothermal route. The samples were characterized by XRD , SEM, TEM , XPS , BET and UV–Vis–NIR. The in-situ incorporation of Bi into the semiconductor BiOCl nanosheets with oxygen vacancies could be regulated efficiently by the Ag + additive content. The samples presented a strong optical absorption in the whole region of 200–2400 nm and displayed excellent photocatalytic performance over the full solar spectrum. The presence of metallic Ag, Bi and oxygen vacancies strengthened the light absorption and promoted the charge-carrier separation of BiOCl, resulted in higher photocatalytic activity than that of pure BiOCl and P25 under UV and visible light irradiation. Furthermore, the photocatalytic responsiveness of Ag/Bi/BiOCl was successfully extended to the NIR region. On the basis of the radical species trapping experiments, h + , •O 2 − , and •OH were confirmed to be the mainly active species involved in the degradation of organic pollutants in the NIR region.
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Micro & Nano Letters
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2019
·Vol. 14
·期 8
·865-867
·
IF 0.975
Miao Liang,Guo Zhang,Ruili Li,Yajie Feng,Jianmin Wang,Pei Hou
An environmentally friendly and facile method for the synthesis of small-sized Au–Ag alloy nanoparticles is proposed. The method involves the coreduction of HAuCl 4 and AgNO 3 using Lysimachia christinae polysaccharide as reductant and stabiliser at 85°C. The synthesised alloy nanoparticles with a mean diameter of 3.81 nm are stable in solution due to the stabilising effect of the polysaccharide. Furthermore, Au–Ag nanoparticles have first been introduced into cigarette filter to serve as a synergistic catalyst for reducing CO in mainstream smoke.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Yanfang Xu,Jinhuan Li,Huanmin Ji,Xuexue Zou,Jiaojiao Zhang,Yi Yan
The dielectric-dielectric composite (SRGA) for electromagnetic absorber was fabricated via integrating Ag(I)-Schiff base coordination compounds (SSBCC) with three-dimensional reduced graphene aerogel (3D-rGA) powders. SRGA showed excellent electromagnetic wave absorption properties in terms of reflection loss, absorption band width and absorber thickness. Specially, when the mass ratio of SSBC to 3D-rGA powders was 1:3 (SRGA-25), the maximum value of reflection loss at 2 mm was up to −63.82 dB and the effective frequency bandwidth of 6.28 GHz (10.16–16.44 GHz) at 2.5 mm can be obtained. The mechanism investigation of electromagnetic wave absorption for SRGA showed that the enhanced electromagnetic wave absorption was ascribed to enhanced polarization loss derived from good 3D-conductive-network units of 3D-rGA, abundant interfaces caused by the media heterostructure due to the introduction of SSBCC and the good impedance matching condition. And 3D-rGA based materials might be put into practical application only in powder state due to the very low strength of the buck state. Therefore, the investigation on SRGA in our contribution is considered to be an actual performance evaluation of the materials based on three-dimensional graphene for microwave attenuation. This work also provided a method for fabricating excellent graphene-based electromagnetic wave absorbers by simply mixing a suitable dielectric lossy material, e.g. SSBCC.
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COMPOSITES PART B-ENGINEERING
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2019
·
IF 6.864
Jiangtao Xu,Songmin Shang,Shouxiang Jiang
Conventionally, the surface-enhanced Raman spectroscopy (SERS) measurement is performed by dispersing noble metal nanoparticles onto the target sample directly or assembling noble metal nanoparticles onto a micro-sized substrate. Despite it is flourishing, this method is not adequate for various samples, mainly limited by either a defined confinement of the test position or the complex extraction process of the target sample on the irregularly shaped surface, besides the costive materials, complex and uncontrollable fabricating processes. Herein, we demonstrate that the α-Fe 2 O 3 thin film is decorated with Ag nanoparticles constructed on SiO 2 fibers as a flexible SERS-active substrate, which yields a functional optical enhancement of the signal at 532 nm laser excitation . It shows a high enhancement factor of 4.71 × 10 5 , ultrahigh sensitivity of 10 −15 M, and excellent signal stability with a relative standard deviation (RSD) of 1.22% and reproducibility with a RSD of 0.258%.
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Nanoscale
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2018
·Vol. 10
·期 15
·6892-6899
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IF 7.233
Zhiqiang Cheng,Shengzhe Zhao,Lihao Han
A novel method for synthesizing ZnO/γ-Al2O3 nanofibers by electrospinning and subsequent calcination is reported. The prepared nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The ZnO/γ-Al2O3 nanofibers exhibited excellent capacity for adsorbing organics with a negative zeta potential such as methyl orange (95.8%) and heavy metal ions such as Cr(VI) in aqueous solution. The mechanism of adsorption was investigated, and the adsorption results were fitted using the Langmuir and Freundlich models. Once silver nanoparticles (Ag NPs) were decorated on the surface of the nanofibers by photoreduction, the Ag/ZnO/γ-Al2O3 nanofibers manifested efficient photocatalytic degradation of methyl orange under UV-light illumination. Results confirmed that our Ag/ZnO/γ-Al2O3 nanofibers are a promising adsorbent for the removal of methyl orange and Cr(VI) ions and the adsorbent can be sustainably reused.
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PubMed
高影响因子
MICROCHIMICA ACTA
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2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Li Hongji,Wang Xiaonan,Wang Zirun,Wang Yan,Dai Jiangdong,Gao Lin,Wei Maobin,Yan Yongsheng,Li Chunxiang
A new method is described for the determination of the pesticide λ-cyhalothrin (LC). It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates. Firstly, the surface of the SiO 2 @rGO@Ag composite was modified with self-polymerized dopamine. Secondly, surface-initiated polymerization was carried out to prepare a molecularly imprinted polymer (MIP) using LC as the template. The use of this SiO 2 @rGO@Ag-MIP allows for excellent SERS based detection and has high selectivity for LC. The Raman intensity and LC concentration present perfect linear relationship between 10 −5 to 10 −9 mol L −1 and the detection limit is 3.8×10 −10 mol L −1 . All the procedures are conducted in aqueous or ethanol solution.
Schematic of a new method for determination of the pesticide λ-cyhalothrin. It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Ruohao Dong,Haoran Du,Yixuan Sun,Kuangfu Huang,Wen Li,Baoyou Geng
The design and synthesis of high-performance catalysts for oxygen evolution reaction (OER) are crucial for electrocatalysis reaction. In this study, the new Ag-decorated Co-based hydroxides nanosheets with good performance as well as gram-scale yield are prepared by a selective reduction–oxidation method in virtue of the different stability of metal in air. The doping of silver obviously raises the electrical conductivity of the catalysts. Due to the synergistic reaction of the high electrical conductivity and the original active sites, the overpotential of the as-prepared Ag-decorated Co(OH)2 nanosheets is as low as 270 mV at 10 mA/cm2. Compared to the pure Co(OH)2 nansheets, the overpotential decreased about 80 mV at the same current density. Especially, different from the general preparation methods, this process can be carried out at room temperature and does not need any strict condition. And the gram-scale output gives this method potential for industrial production.
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CRYSTENGCOMM
·
2018
·Vol. 20
·期 25
·3550-3558
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IF 3.304
Fang Tang,Meizhu Zhang,Zhongbo Li,Zhaofang Du,Bensong Chen,Xuan He,Siyu Zhao
Surface-enhanced Raman scattering (SERS) is one of the most promising methods in detecting trace amounts of molecules owing to its high sensitivity, fast response, and high molecular specificity. One of the key issues for SERS applications is to fabricate highly sensitive and homogeneous SERS substrates. Here, we present a template-assisted synthetic approach to fabricate urchin-like Ag-nanoparticle (Ag-NP) decorated ZnO-nanorods grafted on hexagonally ordered polyacrylonitrile (PAN) nanopillar arrays as flexible and reliable surface-enhanced Raman scattering (SERS) substrates, which are achieved by a combined process of molding highly ordered PAN-nanopillar array films, electrochemical depositing ZnO nanorods onto molded PAN nanopillar arrays, then sputtering Ag-NPs onto the surface of ZnO nanorods. The resultant hetero-hierarchical nanostructure exhibits not only much stronger SERS activity but also uniform SERS signals over the whole arrays based on the high density of nanogaps (hot spots) between the neighboring Ag-NPs on both the same ZnO-nanorods and adjacent ZnO-nanorods and the highly ordered PAN-nanopillar arrays. Using the Ag-NP assembled ZnO-nanorod arrays as SERS-substrates, not only 10−13 M Rhodamine 6G has been identified, but also 10−8 M parathion-methyl has been recognized, showing great potential in detection of trace organic pollutants in the environment. Furthermore, the Ag-NPs@ZnO-nanorods could achieve self-cleaning and reactivation of SERS-activity by simple UV light irradiation and retain stable SERS sensitivity even after five cycles, demonstrating the high reusability of the hybrid substrates.
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POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 58
·期 12
·2227-2236
·
IF 1.551
Yang Ren,Shihong Zhang,Xinyi Wan,Yingqing Zhan,Jieming Zhang,Yi He
To obtain high-performance dielectric materials with high dielectric constant and low dielectric loss, novel polymer composites based on poly(arylene ether nitrile) and Ag nanoparticles decorated halloysites nanotube(HNTs) were presented. For this purpose, halloysites nanotubes were modified by bio-inspired polydopamine coating, which acted as both the template and reducing agent for decoration of HNTs by Ag nanoparticles. Moreover, a modified bio-inspired method was developed to realize the surface modification of Ag nanoparticles decorated HNTs hybrid by introducing secondary functional monomer (KH550) to polydopamine system. Therefore, the synergistic effect and good interfacial adhesion contributed to the interesting properties of resulting PEN composites. With addition of 9 wt% Ag nanoparticles decorated HNTs hybrid, the dielectric constant of PEN composite was increased from 3.2 of pure PEN to 10.6 (100 Hz), and low dielectric loss of PEN composite was remained. Furthermore, the tensile strength of PEN composite with 3 wt% of Ag nanoparticles decorated HNTs hybrid increased from 81.07 MPa of pure PEN to 101.3 MPa (increased by 25%). In addition, the glass transition temperature ( T g ) reached 171.9°C with addition of Ag nanoparticles decorated HNTs hybrid, which exhibited the significant enhancement in thermal stability. POLYM. ENG. SCI., 58:2227–2236, 2018. © 2018 Society of Plastics Engineers
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Fumei Zuo,Cong Zhang,Han Zhang,Xingrong Tan,Shihong Chen,Ruo Yuan
A solid-state electrochemiluminescence (ECL) biosensor for the detection of concanavalin A (Con A) was constructed using graphene quantum dots (GQDs) as luminophore, which were loaded on polyamidoamine (PAMAM) functionalized CeO 2 @Ag NPs by the interaction between the NH 2 of PAMAM and the COOH of GQDs. The electrodepositing gold layers were used as matrix to immobilize glucose oxidase (GOx). GOx served as recognition elements to further capture Con A by the specific interaction between carbohydrate and Con A. With the increase of the concentration of Con A, the amount of GOx-CeO 2 @Ag-GQDs incubated onto the electrode was increased and a higher ECL signal was obtained. The constructed biosensor exhibited a sensitive response towards Con A and a low detection limit of 0.16 pg/mL was obtained. Such a construction strategy provides a new approach for applying GQDs to establish a solid-state ECL biosensor.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Yi Lin,Shaohua Xu,Jiao Yang,Youju Huang,Zhitao Chen,Bin Qiu,Zhenyu Lin,Guonan Chen,Longhua Guo
Common colorimetric immunoassays only show monochromatic intensity variations, and the absorbance intensity is utilized for the quantitative detection of the analytes. Herein, we demonstrate for the first time that Au Nanobipyramid@Ag Nanorods (Au NBP@Ag) is an ideal multicolor chromogenic substrate for immunoassays which combines the absorbance intensity with the Localized Surface Plasmon Resonance (LSPR) peak shifts are utilized for quantitative detection of the analytes, and vivid color variations are used for semi-quantitative detection. Our investigation reveals that unlike the single metallic nanoparticles such as gold nanorods which show one-way LSPR peak shifts, Au NBP@Ag Nanorods shows an interesting multi-way peak shifts: the LSPR peak would initially blue shift, and then red shift, finally blue shift again during the etching process. As a result, a series of vivid colors can be observed. The results indicate that the correlation linear range for the detection of Squamous cell carcinoma antigen (SCCA) was 2.5–105 ng/mL. Although only the detection of SCCA is demonstrated in this work, this method is easy to expand to detect other biomarkers since our method is based on conventional immunoassay strategy.
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危险品化学品经营许可证（带存储）