Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 30
·15822-15827
·
IF 8.867
Na Liu,Weifeng Zhang,Xiangyu Li,Ruixiang Qu,Qingdong Zhang,Yen Wei,Lin Feng,Lei Jiang
Effective removal of oils and aromatic dyes from water is of critical, global importance for environmental and water remediation. A green and facile electro-deposition approach to anchor Ag nanoparticles (NPs) onto the surface of a mesh support coated with polydopamine is proposed. The Ag NPs with high surface energy and specific surface area endow the resultant mesh with superhydrophilicity/underwater superoleophobicity as well as superior catalytic reduction ability of aromatic dyes. The mesh with anchored Ag NPs exhibits excellent oil removal capacity and in situ catalytic performance in the reduction of sundry aromatic dyes. Furthermore, the as-prepared mesh can be readily reused or stored in air even under harsh conditions because of its robust immobilization capability and strong resistance to oxidation. These versatile abilities integrated with a facile fabrication process provide promising potential for cost-effective water purification.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·94682-94686
·
IF 3.289
Li Liu,Jie Zhao,Wei-Hua Li,Xiao-Ying Zhang,Hui-Zhong Xu,Kai Li,Yan Kai,Li-Shui Sun,Chao-Qin Li,Fa-Qian Liu
An effective strategy to improve the conductivity of MnO2-based electrodes is to combine them with some conductive materials, such as metal or carbon-based materials. In this work, Ag nanoparticles decorated MnO2/Sulfonated Graphene composite with 3D macroporous structure (3D Ag–MnO2/SG) was synthesized and their performance as electrode material in supercapacitors was studied. The improved conductivity and the elaborate design of 3D porous structure allowed the 3D Ag–MnO2/SG electrode to possess enhanced electrochemical performance. For example, the electrochemical testing results demonstrated that the 3D Ag–MnO2/SG presents a capacitance of 537 F g−1 at 0.5 A g−1, which is much higher than that of MnO2 (∼172 F g−1). Moreover, the 3D Ag–MnO2/SG electrode delivers a higher capacity retention rate in high current density and smaller charge transfer resistance than that of MnO2, which is contributed by the synergistic effect from the Ag nanoparticles and the 3D porous SG.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 1
·279-287
·
IF 4.831
Wang Rong,Xu Yi,Wang Renjie,Wang Chunyan,Zhao Huazhou,Zheng Xiangquan,Liao Xing,Cheng Li
This article describes a microfluidic SERS chip-based rapid and high-throughput method for the determination of chemical and biological analytes, specifically of melamine. The chip consists of an indium tin oxide (ITO) glass plate modified with silver-gold nanocomposites (Ag-Au NCs) and a polydimethylsiloxane (PDMS) cover plate. The chip has five parallel microfluidic channels. The ITO glass provides electrical conductivity and has a smooth surface which makes it well suited for the deposition of the Ag-Au NC by electrodeposition and galvanic replacement. This technique allows good control of the morphology and composition of the composite. Under optimized conditions, the microfluidic SERS chip provides excellent sensitivity for 4-mercaptobenzoic acid (4-MBA). The detection limit is 0.1 nM and the SERS enhancement factor is 2.7×10 10 . The chip exhibits good stability over time and good reproducibility, with a RSD of 8.6 % between the 5 micro-channels. The chip was successfully applied to the determination of melamine in milk with a 10 nM detection limit and an analytical range from 10 nM to 0.1 mM. It is demonstrated that the microfluidic SERS chip developed here shows great promise for use in biochemical assays.
A microfluidic SERS chip employing gold nanocomposites (Ag-Au NCs) as SERS-active substrate was fabricated. Its SERS enhancement factor is 2.7⋅10 10 . The chip was applied to determinate melamine in milk with detection limit of 10 nM.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 21
·3105-3113
·
IF 1.9
Zhuo Chen,Lu Qiu,Yunfei Tian,Yong-Ill Lee,Xiandeng Hou,Li Wu
We developed a surface-enhanced Raman scattering (SERS)-active substrate based on chemical vapor deposition (CVD)-grown monolayer graphene-encapsulated silver nanoparticles (Ag NPs) and used it for the detection of 2,4,6-trinitrotoluene (TNT). Monolayer graphene-encapsulated Ag NPs can be used as a stable substrate for up to 2 months under aerobic exposure. The single layer of graphene can effectively stabilize the Ag NPs against oxidation and corrosion in the presence of H2O2, Na2S and HNO3. Due to the combination of the Ag NPs with graphene, the Raman signals of probe molecules were dramatically enhanced. This platform exhibits extraordinarily high sensitivity and excellent stability for the detection of TNT, with a limit of detection as low as 6.6 × 10−10 mol L−1. This work provides a simple approach to fabricate graphene-encapsulated Ag NPs for sensitive SERS sensing of TNT after Fenton oxidation degradation.
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2016
·
IF 2.725
Na Tian,Xufeng Ni,Zhiquan Shen
Imidazolium-functionalized hyperbranched polymeric ionic liquids (HPILs) are synthesized by one-step reaction between tri-imidazolium-based ester (A 3 monomer) and dihaloalkane (B 2 monomer), which can act as efficient stabilizers in the preparation of silver nanoparticles . The particle size and solubility of nanoparticles mainly depend on the chemical structure of stabilizer, molecular weights of HPILs, and concentration of reagent. The obtained HPIL-encapsulated Ag nanoparticles were characterized by ultraviolet–visible (UV–Vis) absorption and transmission electron microscopy , showing a uniform size distribution and appreciable stability in water for a longer period.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Sheying Dong,Dandan Zhang,Gaochao Suo,Wenbo Wei,Tinglin Huang
A novel multi-function Metal-Organic Framework composite Ag@Zn-TSA (zinc thiosalicylate, Zn(C 7 H 4 O 2 S), Zn-TSA) was synthesized as highly efficient immobilization matrixes of myoglobin (Mb)/glucose oxidase (GOx) for electrochemical biosensing. The electrochemical biosensors based on Ag@Zn-TSA composite and ionic liquid (IL) modified carbon paste electrode (CPE) were fabricated successfully. Furthermore, the properties of the sensors were discussed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and amperometric current-time curve, respectively. The results showed the proposed biosensors had wide linear response to hydrogen peroxide (H 2 O 2 ) in the range of 0.3–20,000 μM, to nitrite (NO 2 − ) for 1.3 μM–1660 μM and 2262 μM–1,33,000 μM, to glucose for 2.0–1022 μM, with a low detection limit of 0.08 μM for H 2 O 2 , 0.5 μM for NO 2 − , 0.8 μM for glucose. The values of the apparent heterogeneous electron transfer rate constant ( k s ) for Mb and GOx were estimated as 2.05 s −1 and 2.45 s −1 , respectively. Thus, Ag@Zn-TSA was a kind of ideal material as highly efficient immobilization matrixes for sensitive electrochemical biosensing. In addition, this work indicated that MOF nanocomposite had a great potential for constructing wide range of sensing interface.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2016
·Vol. 9
·期 3
·876-885
·
IF 8.893
Qian Hongmei,Xu Meng,Li Xiaowei,Ji Muwei,Cheng Lei,Shoaib Anwer,Liu Jiajia,Jiang Lan,Zhu Hesun,Zhang Jiatao
This study reports the controllable surface roughening of Au–Ag alloy nanoplates via the galvanic replacement reaction between single-crystalline triangular Ag nanoplates and HAuCl 4 in an aqueous medium. With a combination of experimental evidence and finite element method (FEM) simulations, improved electromagnetic field (E-field) enhancement around the surface-roughened Au–Ag nanoplates and tunable light absorption in the near-infrared (NIR) region (~800–1,400 nm) are achieved by the synergistic effects of the localized surface plasmon resonance (LSPR) from the maintained triangular shape, the controllable Au–Ag alloy composition, and the increased surface roughness. The NIR light extinction enables an active photothermal effect as well as a high photothermal conversion efficiency (78.5%). The well-maintained triangular shape, surface-roughened evolutions of both micro- and nanostructures, and tunable NIR surface plasmon resonance effect enable potential applications of the Au–Ag alloy nanoplates in surface-enhanced Raman spectroscopic detection of biomolecules through 785-nm laser excitation.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2016
·Vol. 16
·期 8
·1241
·
IF 2.033
Jing Liu,Haoyuan Cai,Chaoyang Chen,Guangsong Yang,Cheng-Fu Yang
In this study, the hybrid Au–Ag hexagonal lattice of triangular and square lattice of quadrate periodic nanoparticle arrays (PNAs) were designed to investigate their extinction spectra of the localized surface plasmon resonances (LSPRs). First, their simulating extinction spectra were calculated by discrete dipole approximation (DDA) numerical method by changing the media refractive index. Simulation results showed that as the media refractive index was changed from 1.0 to 1.2, the maximum peak intensity of LSPRs spectra had no apparent change and the wavelength to reveal the maximum peak intensity of LSPRs spectra was shifted lower value. Polystyrene (PS) nanospheres with two differently arranged structures were used as the templates to deposit the hybrid Au–Ag hexagonal lattice of triangular and square lattice of quadrate periodic PNAs by evaporation method. The hybrid Au–Ag hexagonal lattice of triangular and square lattice of quadrate PNAs were grown on single crystal silicon (c-Si) substrates, and their measured extinction spectra were compared with the calculated results. Finally, the fabricated hexagonal lattices of triangular PNAs were investigated as a sensor of polychlorinated biphenyl solution (PCB-77) by observing the wavelength to reveal the maximum extinction efficiency (λmax). We show that the adhesion of β-cyclodextrins (SH-β-CD) on the hybrid Au–Ag hexagonal lattice of triangular PNAs could be used to increase the variation ofλmax. We also demonstrate that the adhesion of SH-β-CD increases the sensitivity and detection effect of PCB-77 in hexagonal lattice of triangular PNAs.Keywords:hybrid Au–Ag periodic nanoparticle arrays;discrete dipole approximation (DDA);sensor;β-cyclodextrins (SH-β-CD);polychlorinated biphenyl
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Hong Huang,Hua Li,Jiu-Ju Feng,Ai-Jun Wang
Herein, we demonstrate a facile, straightforward and green method for synthesis of highly red-emitting fluorescent bimetallic Au/Ag nanoclusters (NCs) employing lipoic acid as both a reducing agent and a protecting agent. The as-prepared Au/Ag NCs exhibited bright red emission with a strong peak centered at 630 nm (quantum yield measured as 6.4%), and showed excellent stability and remarkable temperature-dependent fluorescent property. The fluorescence responses were reversible and linear to the environment temperature from 20 to 65 °C with a resolution as high as 1.34 °C, which allows its potential application as a fluorescent nanothermometer. Moreover, Au/Ag NCs were also explored for selective and sensitive determination of Fe 3+ based on the specific quenching of the fluorescence by Fe 3+ , and explored for fluorescence imaging Fe 3+ in living HeLa cells thanks to their very low cytotoxicity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yanqin Yang,Mengmeng Kang,Shaoming Fang,Minghua Wang,Linghao He,Xiaozhong Feng,Jihong Zhao,Zhihong Zhang,Hongzhong Zhang
It is highly desirable and a popular topic in scientific research to develop a highly sensitive and selective detection and quantitative analysis method of determining trace silver ions (Ag + ) in aqueous media since Ag + ions are recognized as one of the most hazardous metal pollutants. Three-dimensional graphene oxide (3D-GO) was decorated with Fe 3 O 4 to form nanocomposites of Fe 3 O 4 @3D-GO, which were further used as electrode materials in an electrochemical DNA sensor for detecting Ag + . Because of the chemical functionality and porous structure of the developed nanocomposites, single-stranded and cytosine-rich oligonucleotides could be anchored onto their surfaces or interior, followed by selective detection of Ag + through formation of C–Ag + –C complex forms. The results of electrochemical measurement showed that the Fe 3 O 4 @3D-GO nanocomposites exhibits high sensitivity for detecting Ag + with a detection limit of 2.0 pM within the range of 0.01–100 nM Ag + (S/N = 3). The developed electrochemical biosensor based on Fe 3 O 4 @3D-GO exhibits highly selectivity, good repeatability, and stability for detecting Ag + ions. The results of this work demonstrate that Fe 3 O 4 @3D-GO nanocomposites could be used as a promising tool to detect heavy metal ions in water or the environment.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2014
·Vol. 4
·期 1
·1-9
·
IF 5.078
Jiang Jizhou,Ou-Yang Lei,Zhu Lihua,Zou Jing,Tang Heqing
Through in-situ reduction of silver nitrate without using any coupling-agent, a substrate for surface-enhanced Raman scattering (SERS) was prepared by coating silver on hollow buoyant silica microspheres as a lab on a bubble (LoB). The silver coated LoBs (LoBs@Ag) floated on surface of a solution could provide a very convenient platform for the detection of target molecules in the solution. The LoBs@Ag substrate not only immobilized well-distributed Ag nanoparticles on the surface LoBs, but excluded the interference of coupling agents. This yielded high-resolution SERS spectra with excellent reproducibility. The adsorption of crystal violet (CV) on the LoBs@Ag substrate was investigated by means of SERS combined with density functional theory (DFT) calculations. The LoBs@Ag substrate exhibited a remarkable Raman enhancement effect for CV with an enhancement factor of 6.9 × 10 8 and wide adaptability from dye, pesticide to bio-molecules. On the basis of this substrate, a simple and sensitive SERS method was proposed for the determination of trace organic pollutants or bio-molecules.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2013
·Vol. 3
·期 38
·17469-17476
·
IF 2.562
Li-Jun You,Qiao An,Jia Guo,Jack J. Hu,Chang-Chun Wang
Uniform MF/Ag-NPs core–shell composite microspheres were fabricated as isolated SERS (surface-enhanced Raman scattering)-active substrates through coating of Ag nanoparticles (Ag-NPs) onto MF (melamine formaldehyde resin) microspheres. These composite microspheres can be imaged and individually manipulated under an optical microscope. Their SERS spectra can be taken at the focal point to ensure the best analysis result or to recognize the identity of the microsphere for flow cytometry. In this paper, the SERS activity of the composite microspheres was evaluated using 4-ABT, 4-CBT, and 4-DTNB as the Raman reporting molecules; the SERS data of tetramethylthiuram disulfide were also acquired on the isolated MF/Ag-NPs core–shell composite microsphere. Due to the significant electromagnetic coupling effect created by the Ag-NPs on the MF microsphere, the SERS detection limits for 4-ABT, 4-CBT, and 4-DTNB were as low as 10−9 mol L−1, 10−10 mol L−1, and 10−8 mol L−1, respectively. For the insecticide tetramethylthiuram disulfide, the detection limit was 10−9 mol L−1 using the isolated MF/Ag-NPs microsphere as the SERS substrate. The SERS signal intensity linearly depended upon the concentration of tetramethylthiuram disulfide, indicating that the MF/Ag-NPs core–shell composite microsphere can be used for quantitative analysis of this insecticide.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）