SOLAR ENERGY
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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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RSC Advances
·
2016
·Vol. 6
·期 53
·47761-47770
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IF 3.289
Bingqi Mao,Qingda An,Bin Zhai,Zuoyi Xiao,Shangru Zhai
As a newly appeared biomimetic platform and universal surface modification agent, polydopamine (PDA) has been paid great attention recently. However, the fabrication of multifunctional hollow PDA-based nanostructures remains a challenge and has been rarely reported. Herein, a facile method to prepare multifunctional hollow Fe3O4/PDA@Ag spherical composites is reported. The in situ embedding of Fe3O4 nanoparticles and the formation of a PDA shell have been achieved in a single system employing carboxylic-capped polystyrene (PS-COOH) spheres as a hard template, which can be selectively dissolved by tetrahydrofuran. Subsequently, silver nanoparticles were anchored on the PDA surface via in situ reduction by the PDA layers, leading to a multifunctional hollow PDA-based composite, i.e., Fe3O4/PDA@Ag. This newly prepared composite could efficiently catalyze the degradation of 4-nitrophenol and rhodamine B with NaBH4 as a reducing agent, and the reaction rate constants were calculated using the pseudo-first-order reaction equation. Compared to non-hollow PS@Fe3O4/PDA@Ag, the hollow composite exhibited an enhanced performance toward both reactions without a significant loss in activity even after ten cycles. This multifunctional hollow PDA-based composite may find potential applications in other domains like heavy metal removal or antibacterial applications.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 35
·18486-18493
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IF 8.867
Fei Wang,Gang Guo,Sheng-Jun Luo,Rong-Bo Guo
Sodium dodecyl sulfate (SDS) has been reported to be the most efficient promoter for hydrate-based natural gas storage and transportation, however, foam generation during hydrate dissociation seriously affects its application. Nano-metal particles have also been demonstrated to be efficient promoters, nevertheless their poor stability is a serious problem. In this work, we first fixed –SO3− groups (similar to the hydrophilic group of SDS) covalently on polystyrene through soap-free emulsion polymerization to synthesize –SO3−-coated nanopolymers, and by tuning their morphology they existed as amorphous polystyrene macromolecules (–SO3−@PSMM) or uniform polystyrene nanospheres (–SO3−@PSNS). Afterwards, we grafted nano-Ag particles with the size of 2–5 nm on the –SO3−-coated nanopolymers through electrostatic adsorption and in situ reduction to prepare Ag&–SO3−-coated nanopolymers (denoted as Ag&–SO3−@PSMM and Ag&–SO3−@PSNS), which were then used for the first time to promote methane hydrate formation. When 0.5 mmol L−1 amorphous Ag&–SO3−@PSMM was used at an initial pressure of 6 MPa and temperature of 275.15 K, the induction period was 32.2 ± 7.9–60.8 ± 14.2 min, the growth period was 108.8 ± 8.2–177.1 ± 38.9 min and the methane storage capacity reached 143.9 ± 3.7–145.2 ± 1.2 v/v, whereas when the spherical Ag&–SO3−@PSNS was used at 0.5 mmol L−1, the induction period and growth period were 17.8 ± 2.8–38.5 ± 8.0 and 39.6 ± 2.8–42.1 ± 0.9 min, respectively; and the storage capacity reached 149.3 ± 1.2–151.3 ± 3.0 v/v, indicating that Ag&–SO3−@PSNS were much better promoters compared with Ag&–SO3−@PSMM. Moreover, Ag&–SO3−@PSNS exhibited excellent recycling performance for 10 cycles of methane hydrate formation–dissociation. To sum up, the Ag&–SO3−-coated nano-promoters developed in this work showed significant potential in achieving the industrial application of hydrate-based natural gas storage and transportation.
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International Journal of Polymeric Materials and Polymeric Biomaterials
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2016
·
IF 1.667
Heqing Fu,Lingyuan Liao,Xiaoya Li,Weifeng Chen
First, modified halloysite-Fe3O4 nanotubes (mHNT-Fe3O4) were synthesized. Second, mHNT-Fe3O4-Ag was synthesized by reduction process. Third, mHNT-Fe3O4-Ag was covalently incorporated into the polyurea (PUA) matrix and the mHNT-Fe3O4-Ag/PUA nanocomposites were prepared. The mHNT-Fe3O4-Ag was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, UV-vis absorption spectra, transmission electron microscopy, thermogravimetric analysis, and dynamic mechanical analysis. The experimental results shown that thermal stability, tensile strength, and storage modulus of nanocomposites were improved with the increasing of the content of mHNT-Fe3O4-Ag. Meanwhile, mHNT-Fe3O4-Ag/PUA nanocomposites had excellent magnetic properties and good antibacterial property.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2016
·Vol. 80
·期 3
·709-718
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IF 1.473
Zhang Libo,Zhang Gengwei,Wang Shixing,Peng Jinhui,Fu Likang
Abstract We prepared the carboxymethyl-dithiocarbamate-functionalized silica nanoparticle for detecting silver ions in aqueous media. The functionalized silica nanoparticles were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy and thermogravimetric analysis. The functionalized silica nanoparticles realize highly sensitive and selective detection for Ag + in aqueous solution with an apparent color change over a pH range of 4–6 and under interfering ions. The functionalized silica nanoparticles allow fast detection for Ag + at 90 °C with a low minimum detectable concentration (0.09 mM). And a remarkable color change also occurs in the presence of Ag + solutions containing EDTA. This developed technique can easy and fast detect silver ions by the naked eye without using any sophisticated instrumentation. Graphical Abstract
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xin Wang,Zhe Zhao,Dingrong Ou,Baofeng Tu,Daan Cui,Xuming Wei,Mojie Cheng
Ag/TiO 2 nanocomposites comprising of Ag clusters on TiO 2 nanocrystal surfaces are of great significance in catalysts and advanced functional materials. Herein a novel method to synthesize Ag/TiO 2 nanocomposites with Ag clusters under 2 nm on TiO 2 nanocrystal surfaces have been developed. The success of this method relies on a silver mirror reaction in toluene, which refers to the reduction of silver-dodecylamine complexes by acetaldehyde in the presence of mono-dispersed TiO 2 nanocrystals. The prepared Ag/TiO 2 nanocomposites have been characterized by FT-IR spectra, UV–vis absorption spectra, X-ray diffraction (XRD) analysis, ultra high resolution scanning electron microscope (Ultra-HRSEM), high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectra (XPS). Catalytic activity of Ag/TiO 2 nanocomposites is evaluated for the reduction of p -nitrophenol (4-NP) into p -aminophenol (4-AP) by NaBH 4 . Results demonstrate that Ag/TiO 2 nanocomposites have shown an outstanding catalytic activity as well as a good stability in successive reduction of 4-NP. Noticeably, TOF of Ag/TiO 2 -0.75 nanocomposites obtained in this work is the highest among Ag based catalysts previously reported.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zezhou Zhu,Jiani Qin,Min Jiang,Zhengxin Ding,Yidong Hou
Photocatalytic reduction of carbon dioxide can convert chemically inert carbon dioxide into useful chemical fuel in a mild manner. Herein, Ag-CdS nanocomposites were prepared by photodeposition method and examined for photocatalytic CO 2 reduction under visible light. Meanwhile, the nanocomposites were characterized by XRD, SEM, TEM, XPS, DRS and PL in detail. The results show that, the deposition of Ag improves the photocatalytic performance of CdS, especially in the selectivity of CO 2 -to-CO. The highest photocatalytic activity is achieved over 1.0 wt.% Ag/CdS, with an increase by 3 times in comparison to CdS. In this reaction system, Ag can serve as electron trap as well as active site for CO 2 reduction, which is probably responsible for the enhanced activity and selectivity of CO 2 to CO over Ag/CdS. The possible mechanism of CO 2 photoreduction over Ag/CdS was proposed in view of the abovementioned analysis.
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Materials Research Express
·
2016
·Vol. 3
·期 6
·065018
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IF 0.968
Pinhua Zhang,Guangliang Cui,Chuanhai Xiao,Mingzhe Zhang,Li Chen,Changmin Shi
We fabricated an Ag decorated Cu (Ag@Cu) nano/microstructure ordered array by facile template-free 2D electrodeposition combined with a galvanic reduction method for SERS applications. The Cu nano/microstructure ordered arrays were first synthesized by a 2D electrodeposition method, then Ag nanocubes were decorated on the arrays by galvanic reduction without any capping agent. The pollution-free surface and edge-to-face heterostructure of Ag nanocubes and Cu nano/microstructure arrays provide the powerful field-enhancements for SERS performance. The results verified that the Ag@Cu nano/microstructure ordered arrays have excellent activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10−8 M. Therefore, this facile route provides a useful platform for the fabrication of a SERS substrate based on nano/microstructure ordered arrays.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2016
·Vol. 49
·期 28
·285105
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IF 2.772
Jiaqi Pan,Jing Li,Xiufang Zhang,Yingying Zheng,Can Cui,Zhiyan Zhu,Chaorong Li
Cotton cellulose nanofibers (CCNFs)/In2S3/Ag–CdS nanocomposites were prepared by a typical technical route which combined electrospinning and a chemical method. The results showed that the CCNFs/In2S3/Ag–CdS nanocomposites had a remarkable visible light photocatalytic property and cycling stability, which displayed a significant enhancement compared with that of pure In2S3. Through analysis, this enhancement could be mainly attributed to the multilevel structure of the composites.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 9
·9370-9378
·
IF 1.798
Wang Chao,Sun Yanli,Yu Xiaohui,Ma Daqian,Zheng Jiao,Dou Peng,Cao Zhenzhen,Xu Xinhua
A novel, stable and sensitive non-enzymatic glucose biosensor based on bimetallic hollow Ag/Pt nanoparticles and the reduced graphene oxide (rGO) was obtained. The hybrid of bimetallic hollow Ag/Pt nanoparticles-reduced graphene oxide (HAg/PtNPs-rGO) was prepared by a galvanic replacement reaction and the thermal reduction of graphene oxide. Thermal reduction has been highly effective in producing graphene-like films which can render a stable substrate for hollow Ag/Pt nanoparticles. The morphology and composition of the prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry and Fourier transform infrared spectra. Cyclic voltammetry measurements demonstrated that the biosensor decorated by HAg/PtNPs-rGO can directly detect glucose and show a superior electro catalytic activity. The results of amperometric method showed a desirable amperometric response with a sensitivity of 129.32 μA mM −1 cm −2 , a linear range of 0.003–7.72 mM (R 2 = 0.9943), a fast response time (less than 3 s) and a low detection limit of 1.8 μM (S/N = 3). In addition, the fabricated sensor also had good selectivity, reproducibility and long-term stability. The sensor modified by HAg/PtNPs-rGO could make a promising application in glucose determination.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Xiang Lv,Fengquan Gao,Yong Yang,Tianhe Wang
We report a simple but novel technique to prepare chemically durable TiO2/Ag films on FTO substrates via coating of P25 TiO2 with colloidal silica as a high temperature binder and subsequent electrochemical deposition of silver nanoparticles (AgNPs). The porous nanostructure facilitated implantation of AgNPs by electrochemical deposition. Extensive measurements on photocatalytic activities of the films prepared under varied conditions showed that TiO2/Ag enhanced MB degradation. Possible mechanisms of such enhancement were discussed in terms of delayed recombination of photogenerated electrons/holes via Schottky barriers and beneficial effects of Surface Plasmon. Experimental results of both electrochemical impedance spectra and transient photocurrent responses on the films supported the observed photocatalytic enhancement by TiO2/Ag heterostructures. The study offers an effective technique to implant uniformly dispersed AgNPs around 3 nm in size within a porous structure and may also provide a strategy for preparations of other functional films on FTO substrates.
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MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Xiaojuan Zhao,Hongda Cui,Tianhe Wang
We report a novel Bi 2 Sn 2 O 7 /Ag-AgCl photocatalysts with excellent visible-light-driven photocatalytic properties. The crystalline Bi 2 Sn 2 O 7 was synthesized by solid-state reaction at 550 °C. Then Bi 2 Sn 2 O 7 /Ag-AgCl was prepared using deposition-precipitation technique followed by photo-reduction of partial Ag + to Ag 0 nanoparticles on surface of AgCl. The photocatalysis were evaluated by degrading organic dyes under controlled conditions. The Bi 2 Sn 2 O 7 /Ag-AgCl composite exhibited a much improved photocatalysis, approximately 7 times stronger than that of pure Bi 2 Sn 2 O 7 , primarily due to its enhanced visible-light absorption and high separation efficiency of charge. On the basis of band structure analysis, a possible mechanism of photocatalysis enhancement for Bi 2 Sn 2 O 7 /Ag-AgCl is proposed. The strong photocatalytic capability, together with simplicity of fabrication suggests Bi 2 Sn 2 O 7 /Ag-AgCl composite provided in this study may have certain practical applications in water treatments. Additionally, the study implies a novel but simple methodology that may be also applicable in construction of other types of single semiconductor/plasmonic composite photocatalysts.
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