CHEMICAL PHYSICS LETTERS
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2018
·
IF 1.686
Lianji Li,Yanan Hao,Jiaqi Guo,Yilin Wang,Li Yu
The fabrication of nanocomposite structures for Nano-Optics is facing many challenges due to the special performance requirements. In this work, a novel Ag nanoprism@SiO 2 @QD composite nanostructure is designed and fabricated to meet the desire of optical experiments. This material has good morphology and high monodispersity, and quantum dots can stably attach to the silica layer through chemical bonds. Simulation results confirm that this nanostructure can generates a Rabi splitting with a maximum value of 112 meV. Our coupling system creates a new combination of Ag nanoprisms and quantum dots, providing a high performance nanostructure for future photonic systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Junlei Zhang,Zhen Ma
Ag-Ag 3 VO 4 /AgIO 3 composites composed of Ag-Ag 3 VO 4 particles (major component) and AgIO 3 nanosheets (minor component) were obtained via photoreduction of Ag 3 VO 4 /AgIO 3 composites prepared by sequential precipitation. The optimal Ag-Ag 3 VO 4 /AgIO 3 catalysts (in particular, the one with an AgIO 3 /Ag 3 VO 4 mass ratio of 6.4%) were found to be more active than AgIO 3 , Ag 3 VO 4 , and Ag-Ag 3 VO 4 in the photocatalytic degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC) under visible-light irradiation. Ag-Ag 3 VO 4 /AgIO 3 can be reused in cycling experiments. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were demonstrated by radical-capture experiments as the main active species in the photocatalytic degradation of RhB. The more efficient separation and transfer of photogenerated electron-hole pairs are responsible for the enhanced activity of Ag-Ag 3 VO 4 /AgIO 3 . A possible photocatalytic mechanism is proposed.
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PubMed
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ANALYTICAL LETTERS
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2014
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IF 1.019
Zhong-Xia Wang,Shou-Nian Ding,Ezzaldeen Younes Jomma Narjh
A simple and label-free fluorescent assay for the sensitive determination of biological thiols was developed using Au@Ag nanoclusters. The sensing approach was based on the strong affinity of thiols to silver on the surface of the nanoclusters. In the presence of thiol-containing amino acids, the fluorescence of the Au@Ag nanoclusters was quenched due to the formation of a non-fluorescent coordination complex via the robust Ag-S bond, which allowed the determination of thiol-containing amino acids in a very simple and rapid way. Under the optimal conditions, an excellent linear relationship was present due to quenching of the Au@Ag nanoclusters over cysteine concentrations between 20 nM and 80 µM with a low detection limit of 5.87 nM. Glutathione was determined between 2 µM and 70 µM with a detection limit of 1.01 µM. In addition, the results reveal that the fluorescent assay has excellent selectivity toward thiol-containing amino acids compared to non-thiol containing amino acids. Moreover, the assay was successfully used to determine cysteine in human plasma, and thus Au@Ag nanoclusters are a suitable fluorescent probe for biological applications.
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RSC Advances
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2014
·Vol. 4
·期 73
·38783-38790
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IF 3.708
Hui Yang,Cheng Zhi Huang
Nanofiber matrix loading Ag nanoparticles have been applied for SERS measurements with the limitation of poor reproducibility. By introducing polymethacrylic acid (PMAA) into the electrospun solutions in this contribution, fairly uniform PMAA/poly(N-vinylpyrrolidone) (PVP) ultrafine fibers containing silver nanoparticles (AgNPs) were successfully prepared via electrospinning by means of in situ photo reduction of silver ions. PMAA can significantly improve the absorbing amounts of silver ions in the polymer owing to its linear structure with abundant carboxyl groups, which makes the content and size of formed AgNPs in the polymer matrix to be easily controlled under different light sources (such as desk lamp, 365 nm UV lamp, and 254 nm UV lamp). With the electrospun AgNPs/PMAA/PVP fibrous membranes, malachite green (MG), a significant environmental organic pollutant known for its genotoxicity, was successfully detected with RSD values below 0.2% through SERS signals.
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CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Fengquan Gao,Yong Yang,Tianhe Wang
TiO 2 /Ag nanostructured porous films were prepared by spin coating of P25 TiO 2 /colloidal silica on glass substrate and subsequent photochemical deposition of silver nanoparticles (AgNPs). The adhesion strength of the film on glass substrate was evaluated and the result indicated that porous films formed on the glass substrates were robust and durable. The porous structure of TiO 2 /SiO 2 film facilitated the implantation of uniformly dispersed AgNPs having sizes generally less than 10 nm. By acting as electron scavengers, AgNPs effectively provided an alternative electron transfer route, thus enhancing the photocatalytic efficiency for degradation of methylene blue (MB). Compared with the bare TiO 2 film derived from P25, TiO 2 /Ag porous films showed an improved photocatalytic activity. This conclusion was further supported by photocurrent density measurements on the films. The study also demonstrated experimentally that TiO 2 /Ag porous films had sustained stability with the photocatalysis maintaining its original activity after at least four consecutive reaction cycles.
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Journal of Nanostructure in Chemistry
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2014
·Vol. 4
·期 3
·1-8
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IF 0
Li Lihua,Feng Dexiang,Fang Xian,Han Xiaowei,Zhang Yuzhong
In this work, we have developed a novel visual Hg 2+ sensor in aqueous solution using unmodified Au@Ag core–shell nanoparticles at room temperature, based on a redox reaction between Ag-shell and Hg 2+ . The prepared Au@Ag core–shell nanoparticles exhibited good monodispersity. In the presence of Hg 2+ , Hg 2+ was reduced into Hg (0) by Ag-shell, and deposited on the surface of Au-core to form Au–Hg alloys and caused nanoparticles aggregation, leading to the color changes of the solution from yellow to purplish red, and the surface plasmon resonance spectra of Au@Ag core–shell nanoparticles red shift. Under the optimal conditions, the visual sensor could selectively detect Hg 2+ as low as 0.4 µM with the naked eye and 5.0 nM by UV–vis spectra analysis methods. The designed sensor had several advantages: (1) the nanoparticles surface need not be functionalized. (2) The color change of the solution was in 2 s and could easily be observed with naked eyes. The visual sensor had been applied to detection of Hg 2+ in tap and lake water, which obtained satisfied result.
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Nanoscale
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2014
·Vol. 6
·期 14
·8155-8161
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IF 6.739
Dan Zhu,Zhuyuan Wang,Shenfei Zong,Hui Chen,Xin Wu,Yuwei Pei,Peng Chen,Xueqin Ma,Yiping Cui
A liposome–Ag nanohybrid has been demonstrated as a SERS traceable intracellular drug nanocarrier. Liposomes have been introduced for their special qualities in drug delivery systems. In essence, 4-aminothiophenol (4ATP) tagged Ag nanoparticles (Ag@4ATP) were adsorbed onto the surfaces of liposomes via electrostatic interactions, in which 4ATP was used as a SERS reporter. In such a nanohybrid, the locations of the carrier can be tracked by SERS signals while those of the drugs can be monitored through their fluorescence, allowing the simultaneous investigation of the intracellular distribution of both the carriers and the drugs. Our experimental results suggest that the reported liposomal system has substantial potential for intracellular drug delivery.
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MATERIALS CHARACTERIZATION
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2014
·
IF 1.925
Jin Zhang,Guangwen Duan,Yunzhi Fu,Jinsheng Zhao
Silver nanoparticles were synthesized using a rapid, single step, and completely green biosynthetic method employing aqueous aloe leaf extracts as both the reducing and capping agent. Transmission electron microscopy analysis revealed the average size of silver nanoparticles approximately 18.05 nm. Fourier transform infrared spectroscopy observation showed the estimation of two kinds of binding sites between aqueous aloe leaf and aqueous aloe leaf with silver nanoparticles. In addition, the critical roles of the concentration of silver nitrate, temperature, and reaction time in the formation of silver nanoparticles had been illustrated. Furthermore, silver nanoparticles were deposited on egg membrane bandage, forming a new egg membrane bandage that contained silver nanoparticles that exhibiting excellent antibacterial effects against Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus , which was 2.5 times stronger than the commercially available bandage.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Hong-Fei Shi,Gang Yan,Yi Zhang,Hua-Qiao Tan,Wen-Zhe Zhou,Yuan-Yuan Ma,Yang-Guang Li,Weilin Chen,En-Bo Wang
Photocatalysis, a promising technology platform to address the environmental problems, has been attracting considerable attention. In this paper, Ag/AgxH3–xPMo12O40 (simplified as Ag/AgHPMo12) nanowires have been synthesized by a facile solid reaction route and in situ photodeposited method. The results of SEM and TEM indicate that the diameters of AgHPMo12 nanowires are about 45 ± 10 nm, and Ag nanoparticles with diameters in the range of 5–15 nm are uniformly anchored on the surface of AgHPMo12 nanowires. The Ag content in the Ag/AgHPMo12 composite was manipulated by the light irradiation time (Ag/AgHPMo12-x; x stands for the irradiation time; x = 2, 4, 6, 8 h, respectively). With increasing irradiation time, the light absorption of as-synthesized samples in the visible region was gradually enhanced. The Ag/AgHPMo12-4 exhibits the best photocatalytic performance for the degradation of methyl orange and reduction of Cr2O72– under visible-light (λ > 420 nm) irradiation. The study of the photocatalytic mechanism reveals that both Ag and AgHPMo12 can be excited by visible light. The photoinduced electrons were transferred from AgHPMo12 to metallic Ag, and combined with the Ag plasmonic holes. The Ag plasmonic electrons were trapped by O2 to form ·O2–, or directly reduced Cr2O72– to Cr3+. Meanwhile, the ·O2– species and the photogenerated holes of AgHPMo12 were used to oxidize MO or i-PrOH; thus, they showed highly efficient and recyclable photocatalytic performance for removing the organic and inorganic pollutants.
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ChemCatChem
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2016
·Vol. 8
·期 4
·839-847
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IF 4.724
Changchao Jia,Ping Yang,Jia Li,Baibiao Huang,Katarzyna Matras-Postolek
Graphical One morphology to rule them all : Ag nanowire@TiO 2 (Ag NW@TiO 2 ) heterostructures with three different morphologies were successfully prepared. The Ag NW@TiO 2 core–shell structure exhibited an excellent photocatalytic activity compared with the other two morphologies, owing to the well-developed combined interface between Ag and TiO 2 . Ag nanowire@TiO 2 (Ag NW@TiO 2 ) heterostructures with core–shell, necklace-like, and particle-decorated morphologies were fabricated to investigate the evolution of the photocatalytic properties. The deposition of the TiO 2 phase on the surface of the Ag NWs was achieved through a solvothermal method. Thioglycolic acid (TGA) not only solves the tricky issue of substantial lattice mismatch between the Ag NW core and TiO 2 shell, but also plays an important role in precisely controlling how the TiO 2 is coated on the Ag NW surface. H 2 O molecules affect the deposition of the TiO 2 phase on the Ag NWs. The photocatalytic activity of the Ag NW@TiO 2 heterostructures with different morphologies was evaluated by degradation of methyl orange. The molar ratio of TiO 2 to Ag is crucial for the photocatalytic activity, and the Ag NW@TiO 2 sample with core–shell structure exhibits an excellent performance compared with the others, owing to the TiO 2 phase being densely attached to the Ag NW surface, which forms a well-developed combined interface.
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CRYSTENGCOMM
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2017
·Vol. 19
·期 46
·6964-6971
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IF 3.474
Aleksei Chalgin,Fenglei Shi,Fan Li,Qian Xiang,Wenlong Chen,Chengyi Song,Peng Tao,Wen Shang,Tao Deng,Jianbo Wu
Elemental composition, dimensionality and morphology are the main factors that influence the catalytic activity and stability of platinum-based and noble metal alloy nanocatalysts. Herein, we present a facile and cost-efficient approach to synthesize ternary alloy Pt–Pd–Ag nanoflowers by co-reduction of the metal precursors in aqueous solutions in a suitable molar ratio, involving hexamethylenetetramine as a structure-directing agent and ascorbic acid as a reducing agent. Both the presence of the aforementioned agents and the interaction between the component metals allow good control over the anisotropic growth of the ternary alloy nanostructure. The as-prepared nanocomposite demonstrates superior electrocatalytic activity towards the oxygen reduction reaction in acidic medium, compared with commercial Pt/C (20 wt%) and Pd/C (10 wt%) catalysts, as well as sufficiently good stability, as demonstrated by the accelerated durability test. The electrocatalytic activity of irregularly shaped nanoparticles of the same elemental composition was also measured, which revealed that the nanoflowers were superior catalysts owing to their specific morphological characteristics. Moreover, the nanoflowers displayed a relatively low electrochemical surface area decay (from 100% to 80.82%) due to their three-dimensional open-framework surface which can limit the aggregation of individual particles.
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RSC Advances
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2017
·Vol. 7
·期 48
·30051-30059
·
IF 3.108
Minghui Shang,Huilin Hou,Fengmei Gao,Lin Wang,Weiyou Yang
Photocatalytic hydrogen evolution is a promising solution to energy and environmental problems. The grand challenge for its application is how to make photocatalysts with satisfactory efficiency. In the present work, exploration of Ag@TiO2 mesoporous nanofibers via two strategies is reported, namely in situ electrospinning preparation (strategy I) and electrospinning combined with subsequent photodeposition (strategy II). The photocatalytic behavior of the as-synthesized Ag@TiO2 hybrid nanofibers was evaluated in terms of hydrogen evolution efficiency for the photodecomposition of water under Xe lamp irradiation. It was found that incorporation of Ag nanoparticles into the TiO2 mesoporous nanofibers could enhance remarkably their photocatalytic efficiency. The products prepared through strategy I exhibited the highest photocatalytic performance as compared with those prepared by strategy II. Current work might give some insight into exploration of stable binary photocatalysts, which have potential applications for efficient hydrogen evolution.
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