Coatings
·
2019
·Vol. 9
·期 5
·325
·
IF 2.33
Qiujin Wang,Yifan Zhou,Jixue Zhou,Rongrong Wu,Jianbo Wu,Hao Zheng,Ying Ye,Yuanfeng Huang
In this paper, we successfully fabricated a novel bromide ion selective electrode (Br-ISE), which was coated by bromine ion doped polyaniline as sensitive film. Using Ag wire as the substrate, a uniform and dense nano-silver layer was electroplated to enhance the specific surface area of the electrode. Subsequently, a polyaniline (PANI) film was coated onto the electrode by cyclic voltammetry in a 0.3 M aniline and 1 M HCl solution and was in-situ doped by 0.1 M KBr solution. The morphology and performance of the electrode were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and other electrochemical analysis methods, respectively. The prepared Br-ISE exhibited a wide linear dynamic range between 1.0 × 10−1and 1.0 × 10−7M with a near-Nernst slope of 57.33 mV/decade. In addition, the electrode possessed extremely fast response time (<1 s) and low impedance (300 Ω), high sensitivity, and good selectivity. The electrode potential drifted within 2 mV in 8 h. The lifespan was larger than three months.Keywords:nano-silver;electrode;bromide ion doped PANI;film;in-situ measurement
✓ 已验证
产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2019
·
IF 0.929
Lu Jing,Weili Li,Yu Feng,Yulei Zhang,Jun He,Weidong Fei
Polymer-based composites with high dielectric constant and suppressed dielectric loss were successfully fabricated by using PZT@Ag core-shell structured particles as fillers and PVDF as polymer matrix. The PZT@Ag core-shell structured particles were synthesized via conventional solid-state method. The results indicate that the fillers dispersed in the polymer matrix prominently enhance the dielectric constant while keeping the dielectric loss unchanged simultaneously. Composites with high dielectric constant result from the high dielectric constant of PZT itself, the superior interfacial polarization of PZT@Ag core-shell structure and the conductivity of Ag according to percolation theory, while the dielectric loss is suppressed due to the tunneling current decreasing among Ag particles and Coulomb blockade effect.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Ye Zhang,Zhongyi Jiang,Jing Song,Jian Song,Fusheng Pan,Peng Zhang,Xingzhong Cao
Polymeric dense membranes for separating molecules with similar properties in liquid mixture according to solution-diffusion mechanisms are often constrained by trade-off effects. Integrating a facilitated transport mechanism and a sieving mechanism into membranes is a preferred approach to address this issue. Herein, amine-functionalized titanium-based metal–organic frameworks (NH2-MIL-125(Ti)) immobilized with Ag+, Ag+@NH2-MIL-125(Ti), was synthesized and hybrid membranes were fabricated for pervaporative desulfurization. The immobilized Ag+ can form reversible π-complexation toward thiophene and achieve thiophene-selectivity transport via a facilitated transport mechanism; meanwhile, Ag+ can decrease the effective pore size of the MOFs to elevate the diffusion selectivity of thiophene via a sieving mechanism. Accordingly, the resulting Pebax membranes with 1.0 wt % Ag+@NH2-MIL-125(Ti) exhibit a permeation flux of 22.11 kg/(m2 h) and an enrichment factor of 5.92. Furthermore, the hybrid membranes display increased thermostability and antiswelling properties by the incorporation of Ag+@NH2-MIL-125(Ti). This study proposes a strategy for the rational design of MOFs as nanofillers and endow the membranes with superior separation performance by integrating multiple transport mechanisms.
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Yanlin Li,Wenyuan Duan,Xuegang Lu,Sen Yang,Xiaoxiang Wen
Well-defined Fe 3 O 4 @SiO 2 composite colloidal particles decorated with Ag nanoparticles were successfully synthesized through a simple chemical approach. These particles self-assembled into 1D chain-like photonic structures under the induction of magnetic field and diffract tunable structural colors. The hue and brightness of the structural colors are related to Ag nanoparticles deposited on the particles surface and its brightness increases with the increase of Ag concentration. This phenomenon could be the result of the superposition of photonic bandgap formed by photonic crystals and possible plasmonic property, as well as capability in absorbing stray light of Ag nanoparticles. As-prepared Fe 3 O 4 @SiO 2 @Ag colloidal particles have great potential to be applied in many crucial areas such as color displaying, biological detection and anti-counterfeiting technology.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Bo Wei,Jintang Zhou,Zhengjun Yao,Azhar Ali Haidry,Xinlu Guo,Haiyan Lin,Kun Qian,Wenjing Chen
In the present work, high purity cubic silicon carbide (β-SiC) was synthesized by using resorcinol-formaldehyde aerogel coated silica as precursor at high temperature. Subsequently, β-SiC was coated with various concentrations of silver nanoparticles (Ag NPs) by tin sensitization electroless plating . Thereafter, the effect of various Ag NPs contents on the dielectric and microwave absorption properties of β-SiC was investigated in detailed. It is found that the Ag NPs can significantly increase the overall complex permittivity, reduce the thickness of the absorber and increase the absorption bandwidth to some extent. Despite, the improvement of the attenuation ability of electromagnetic wave with increasing contents of Ag NPs also has an adverse effect on impedance matching. The improvement in the microwave absorption of β-SiC coated with Ag NPs mainly comes from the enhancement of dipole polarization, interface polarization and conductivity loss. In the 2–18 GHz band, Ag@SiC (1.0 g/L) can achieve an effective bandwidth of 4.99 GHz at a thickness of 1.6 mm, and it is a kind of lightweight, high-temperature microwave absorbent with excellent performance.
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·149-164
·
IF 2.064
Sun Jialin,Dai Jingtao,Liu Rui,Yang Xiaowei,Chen Jian
To improve the visible-light catalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal reduction method. Imidacloprid (IMI) was employed as the target pollutant to evaluate the critical impacts on the catalytic activity of as-prepared Ag/AgBr/TiO 2 , where the factors relating to the catalyst (composition, dosage, recycle and reuse) and solution chemistry (pH and concentration, simulated wastewater samples and floodwater of rice paddy field) were studied. The results suggested that benefitting from visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits superior visible-light photocatalytic activity and stability to Ag/AgBr and TiO 2 . The quenching tests with various scavengers indicate that · O 2 − and h + , and · O 2 − and · OH may be the key roles in IMI photo-degradation on Ag/AgBr and on Ag/AgBr/TiO 2 , respectively. Thus, the photocatalytic performance of Ag/AgBr/TiO 2 differs from that of Ag/AgBr. Furthermore, the contribution of such active species is clarified for quantitative mechanisms study. The photo-degradation conducted in the simulated wastewater and the floodwater of rice paddy field proves favorable anti-interference capacity of Ag/AgBr/TiO 2 . The tests conducted on real wastewater sample verified that Ag/AgBr/TiO 2 can mineralize IMI promptly and almost completely.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shuang Lin,Xiang Lin,Siqingaowa Han,Liang He,Haiyan Zhao,Jing Zhang,Wuliji Hasi,Li Wang
An efficient and facile strategy for producing core-shell Au@Ag nanorods (NRs) with controllable width and length as excellent surface enhanced Raman scattering (SERS) substrate was proposed. Au nanodipyramids (NDPs) of three various widths were prepared by overgrowth along the radial orientation, and together with Au NDPs as seed, silver was deposited in the axial orientation to successfully obtain core-shell Au@Ag NRs with diverse length (73 nm–157 nm) and width (25 nm–43 nm). The morphology, optical properties and SERS performance of the as-synthesized Au@Ag NRs were investigated systematically. The broadly tunable UV-Vis absorption range for Au@Ag NRs as far as the near-infrared (NR) region was able to be obtained. Furthermore, the SERS property of Au@Ag NRs two-dimensional monolayer was explored by using crystal violet (CV) as Raman probe. The optimal SERS enhancement effect with enhancement factor (EF) as high as 6.13✕10 5 could be achieved for Au@Ag NRs with wider width and longer length, which was confirmed by the simulation results of electromagnetic (EM) field distribution by FDTD method. Our novel approach provides some facinating insights into adjusting the width of Au@Ag NRs, which also significantly influences the SERS behaviors of the Au@Ag NRs. It allows to fabricating SERS substrate with superior SERS performance compared to previously reported Au@Ag NRs only with tunable length via direct overgrowth. Besides, this as-compounded Au@Ag NRs are expected to have promising application and significant value in other fields.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 39
·22095-22102
·
IF 2.936
Yunfeng Ma,Lili Yang,Yong Yang,Yusi Peng,Yuquan Wei,Zhengren Huang
In this study, g-C3N4/Ag hybrid nanostructures were fabricated by facilely decorating silver nanoparticles on atmosphere-treated g-C3N4 and served as efficient SERS-active substrates. The observed significant SERS enhancement of crystal violet (CV) molecules on g-C3N4/Ag could be attributed to the high ability to concentrate target molecules through π–π stacking interactions and the near-field enhancement caused by the boosting SPR effect of the Ag NPs. The atmosphere and calcination time have a considerable impact on the SERS enhancement effect of the g-C3N4/Ag substrate. Furthermore, it took only 10 min to degrade dye molecules under visible light, and after 6 cycles the g-C3N4/Ag substrates still maintained sensitive SERS activity. This research indicates that g-C3N4/Ag hybrids can be applied as reusable SERS substrates.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materiomics
·
2018
·
IF 0
Qionglian Yang,Mingyu Hu,Jun Guo,Zhenhua Ge,Jing Feng
s Ag/AgCl/TiO 2 nanocomposite was synthesized through the combination of sol-gel process and hydrothermal (HT) method followed by ion exchange method in the paper. Transmission electron microscope, UV–vis absorption property and X-ray diffraction were utilized to characterize the morphology, optical absorption property and phase structure of the as-prepared photocatalysts. The morphological and performance studies of Ag/AgCl/TiO 2 revealed that a well-interconnected mixed phase heterojunction photocatalyst was achieved through as-prepared TiO 2 and the subsequent ion exchange method. By the degradation of Rhodamine B under xenon lamp, Ag/AgCl/TiO 2 exhibited a significant enhancement in photocatalytic activity compared with TiO 2 and Ag/TiO 2 . The band gap of Ag/AgCl/TiO 2 can reach to 2.53eV compared with 3.22eV of the prepared TiO 2 . Furthermore, the synthesis process and photoreaction mechanisms of TiO 2 , Ag/TiO 2 and Ag/AgCl/TiO 2 photocatalysts were proposed. It demonstrated that the enhancement of photocatalytic was mainly due to the reducing of electron-hole recombination in Ag/AgCl/TiO 2 .
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yang Li,Mingfei Jiao,Huijie Zhao,Mujie Yang
Crosslinked and quaternized poly(4-vinylpyridine) (QC-P4VP) nanofibers have been fabricated via electrospinning followed by reaction with 1-4-dibromobutane. Subsequent decoration of the nanofibers with Ag nanoparticles by in-situ reduction obtained a nanostructured composite humidity sensing material. The nanofibers and the composites were characterized by FT-IR and scanning electron microscopy. It was found that the morphology and humidity sensing properties of the nanofibers could be greatly modified by adding poly(vinyl butyral) into the electrospinning solution. Moreover, the decoration with Ag nanoparticles effectively reduced the impedance of the composite under dry atmosphere, and facilitated the measurement of low humidity. Under optimized conditions, the composite presented high response magnitude to humidity, fast response (t 90% of 16 s an 26 s for response and recovery, respectively), small hysteresis (∼2.8%RH), good sensing repeatability and the capability of detecting very low humidity (∼3.6%RH), representing much improvement over QC-P4VP nanofibers alone. The complex impedance spectra of the composites under different humidity levels were measured, and the sensing mechanism was explored. It is proposed that the highly desirable humidity sensing properties of the composite result from its balanced hydrophilicity and the distinct nanostructure.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yanping Zhu,Runliang Zhu,Yunfei Xi,Tianyuan Xu,Lixia Yan,Jianxi Zhu,Gangqiang Zhu,Hongping He
The conventional heterogeneous Fenton reaction is often confined by the lower regeneration of Fe 2+ , which then inhibits the decomposition of H 2 O 2 and the generation of OH. Here we propose a novel idea to significantly accelerate the redox cycling of Fe 2+ /Fe 3+ in heterogeneous Fenton reaction by introducing photo-generated electrons from plasmonic particles. Towards this aim, novel plasmonic Ag/AgCl nanoparticles coated ferrihydrite (Ag/AgCl/Fh) have been synthesized. Compared with pure Fh, a remarkable enhancement in the photo-Fenton degradation towards bisphenol (BPA) can be observed for all Ag/AgCl/Fh samples under visible light. Noticeably, the rate constant of 6%Ag/AgCl/Fh is 0.0506 min −1 , which is about 5.1 times as high as that of pure Fh (0.0099 min −1 ). Moreover, the catalytic activity of 6%Ag/AgCl/Fh on the degradation of BPA remains quite efficient with a low Fe leaching after 4 recycles. The results of the effect of initial pH indicates that Ag/AgCl/Fh samples exhibit relatively high photo-Fenton catalytic activity even at pH 6. The electron spin resonance (ESR) analysis reveals that OH plays a significant role in the photo-Fenton reaction. The concentration of OH can even reach 267.6 μmol/L after 60 min, which is much higher than that of pure Fh (69.2 μmol/L). The measurement of Fe 2+ concentration and the XPS Fe2p spectra of Ag/AgCl/Fh before and after the degradation of BPA indicate the loading of Ag/AgCl can accelerate the conversion of Fe 3+ /Fe 2+ by the photo generated electrons from Ag nanoparticles due to the surface plasmon resonance (SPR) effect under the visible light irradiation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Jie Ma,Xue-Yu Tao,Shi-Xiang Zhou,Xiang-Zhu Song,Lin-Guo,Yao-Wang,Ya-Bo Zhu,Li-Tong Guo,Zhang-Sheng Liu,He-Liang Fan,Xian-Yong Wei
Ag nanoparticles decorated Polyaniline (PANI)/graphitic carbon nitride (g-C 3 N 4 ) composite was fabricated as active electrode materials for supercapacitors via an in-situ oxidative polymerization. Morphology and structure of Ag/PANI/g-C 3 N 4 composite were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). The supercapacitive behavior of the electrode material was tested in a three electrode system using 1.0 M H 2 SO 4 electrolyte. The results indicated that the Ag/PANI/g-C 3 N 4 composite delivered a high specific capacitance of 797.8 F g −1 and an excellent capacitance retention of 84.43% after 1000 cycles at an applied current density of 1 A g −1 . Ragone plot was derived and compared which showed enhanced supercapacitive performance of Ag/PANI/g-C3N4. The composite should be ideal potential electrode materials for high-performance and effective supercapacitors.
✓ 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）