ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 42
·1904777
·
IF 15.621
Chenyang Shi,Jingjuan Wang,Maria L. Sushko,Wu Qiu,Xiaobing Yan,Xiang Yang Liu
Functionalization of flexible materials based on mesoscopic reconstruction is a key strategy in fabricating biocompatible flexible electronics. This work is to acquire new mesoscopic bioelectronic hybrid materials of silk fibroin (SF)-Ag nanoclusters (AgNCs@BSA; BSA: bovine serum albumin), which enhance significantly the performance of silk memristors. It is to build AgNCs@BSA into SF mesoscopic networks by templated β-crystallization. Atomic force microscopy potential probing indicates that AgNCs@BSA serve as electronic potential wells that change completely the transport behavior of charge particles within the SF films. This leads to significant enhancement in the switching speed (≈10 ns), very good switching stability, extremely low set/reset voltages (0.3/−0.18 V) of SF meso-hybrid memristors, compared with the original and other organic memristors, and displays unique synapse characteristics and the capability of synapse learning. Classical density functional theory Poisson–Nernst–Planck simulations indicate that the enhanced performance is subject to the low potential paths interconnecting the AgNCs@BSA, which guide charges' transport (Ag + ) and deposition in SF films.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 31
·期 3
·2231-2239
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IF 2.195
Zhao Gao-yu,Le Meng-ting,Zeng Gui-ju,Zhang Yu,Li Jin-hai
A new and rapid synthetic method toward polymer phenylethnylcopper (PPECu) nanowires is developed. PPECu nanowires have been firstly fabricated through using ascorbic acid instead of methanol as reducing agent. The preparation time of PPECu can be decreased from 48 to 2 h, even at a lower temperature. Ag/PPECu nanocomposites were prepared by the in situ reaction of PPECu and Ag (NH 3 ) + 2 ions with different concentrations. Ag/PPECu photocatalysts showed high visible-light H 2 production activity, which originated from the combined action of electrons transfer, sacrificing reagent and SPR effect of Ag nanoparticles.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Jixing Cui,Rezwana Yeasmin,Yuanyuan Shao,Haiping Zhang,Hui Zhang,Jesse Zhu
There is an increasing interest to enhance resistance to pathogens on the powder-coated surface. Traditional silver antimicrobial agents are hard to endure high curing temperature and lead to the yellowness of the surface appearance. Commercial sources usually cut down silver loading (less than 2.5 wt %) to avoid the color change and this will result in a low inhibitory effect and poor durability. To improve the antimicrobial performance and maintain the appearance, Ag+, Cu2+, and Zn2+ ternary inorganic antimicrobial agents on Linde A zeolite supports were prepared in this study. The silver content of this agent is increased to 8–10 wt % and the coated surface exhibits high antimicrobial efficiency. The coating appearance shows a little adverse color change (ΔE = 1.47) when adding 2 wt % amount of agent. The reduction rate of this agent was over 99.99% after 6 h for Escherichia. coli, Staphylococcus aureus, and Candida albicans according to the ASTM E2180-07 standard, and the paint film can maintain over 99% reduction rate even for 11 cleaning cycles. X-ray photoelectron spectroscopy results show that Cu2+ is the main reduced ion during the curing process, which protects Ag+ from reduction. The leaching test confirms Zn2+ increases the number of extra exchangeable cations, which can prolong the antimicrobial durability. The selected molar ratio of Ag+, Cu2+, and Zn2+ is 1:2:3 according to quantitative study. Moreover, the addition of fillers and pigments was slightly increased the color change of the coated surface.
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ChemCatChem
·
2019
·Vol. 11
·期 15
·3490-3504
·
IF 4.495
Shanshan Ding,Mengshu Han,Yuxuan Dai,Shaogui Yang,Danjun Mao,Huan He,Cheng Sun
Graphical Next level silver : The novel plasmonic heterojunction photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were successfully synthesized by the in-situ deposition and visible-light photoreduction approach. They performed elevated photocatalytic activities towards the degradation of acid orange II and aniline under visible-light irradiation than Bi-O-Br and Ag/AgBr, which was mainly credited to the surface plasmon resonance (SPR) effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 The novel photocatalysts of Ag/AgBr/Bi 4 O 5 Br 2 layered microspheres (AAB-LMs) were firstly constructed via the in-situ deposition and visible-light photoreduction approach. Their compositions, structures, morphologies and optical properties were characterized by various techniques. The photocatalytic efficiencies of AAB-LMs-10 were 28 and 3.4 times higher than those of Bi 4 O 5 Br 2 -LMs towards degrading acid orange II and aniline, respectively. The superior photocatalytic behavior of AAB-LMs benefited from efficient separation and transfer of photo-generated charges, which was mainly credited to the surface plasmon resonance effect of Ag nanoparticles and the synthetic interaction among Ag, AgBr and Bi 4 O 5 Br 2 . O 2 − and h + were characterized as the predominant photoactive species in this AAB-LMs-photocatalysis system. Moreover, due to the presence of radical species Br 0 , which was verified by the detection of bromoaniline and dibromoaniline during the photocatalytic degradation process of aniline, Z-scheme mechanism rather than the conventional heterojunction mode was more suitable to explain the enhanced photocatalytic performance of AAB-LMs.
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Nanomaterials
·
2018
·Vol. 8
·期 6
·400
·
IF 3.504
Yudong Lu,Dechan Lu,Ruiyun You,Jialing Liu,Luqiang Huang,Jingqian Su,Shangyuan Feng
A novel, simple, and highly sensitive method was developed to detect the concentration of tyrosine-derived azo dye indirectly using silver nanocubes (AgNCs) as a substrate on a super-hydrophobic silver film by surface-enhanced Raman spectroscopy (SERS). Diazotization-coupling reaction occurred between diazonium ions and the phenolic tyrosine, resulting in three new typical peaks in the SERS spectrum of the azo dye that was formed on the AgNCs, indicating strong SERS activity. Subsequently, the limit of detection of this approach was as low as 10−12M for tyrosine. Moreover, the SERS intensities of the three typical SERS signals of the analyte were linearly correlated with the logarithm of concentration of the Tyrosine. The proposed method shows great potential for tyrosine detection in the urine samples of normal humans.Keywords:silver nanocubes;diazotization-coupling reaction;Tyrosine;Surface enhanced Raman scattering
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POLYHEDRON
·
2018
·
IF 2.067
Xiao-Long Zhang,Gui-Mei Tang,Yong-Tao Wang
In this paper, three Ag-based metal coordination polymers have been synthesized, namely, [Ag( BS )( BPP ) 2 ] ( 1 ), [Ag( MBS )( BPP ) 2 ] ( 2 ), and [Ag( ABS )( BPP ) 2 ]·H 2 O ( 3 ) ( BS = benzenesulfonate, MBS = p -toluenesulfonate, ABS = p -aminophenyl sulfonate, BPP = 1,3-bis(pyridine-4-yl) propane). Metal coordination polymer 1 – 3 were structurally characterized by X-ray single-crystal diffraction, IR spectra, thermogravimetry analysis (TGA), and X-ray diffraction (PXRD). Through the X-ray single-crystal diffraction analyses, metal coordination polymers 1 and 2 exhibit one-dimensional structural motifs. Interestingly, metal coordination polymer 3 display the mixed one-dimensional and two-dimensional structures. Their thermogravimetric behaviors have been studied. Additionally, the luminescent properties of metal coordination polymers 1 – 3 were investigated in the solid-state at room temperature in details, which display the maximal emission peaks located at 388, 334 and 450 nm, respectively.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
A novel Ag nanoparticles (NPs) decorated WO 3 nanoplates/g-C 3 N 4 (CN) nanosheets 2D/2D heterostructure was successfully synthesized by a solvent evaporation and in situ calcination method. The as-prepared WO 3 /Ag/CN ternary composite exhibited remarkably enhanced photocatalytic activity towards rhodamine B (RhB) and tetracycline (TC) degradation compared with WO 3 , CN, Ag/WO 3 , Ag/CN and WO 3 /CN under visible light irradiation. The enhanced photocatalytic activity could be attributed to the efficient separation of photogenerated charge carriers, the strong redox ability and enhancement of visible-light absorption derived from the construction of Z-scheme 2D/2D heterostructure. Ag NPs not only possess the surface plasmon resonance (SPR) effect, but also act as an electron mediator in Z-scheme heterostructure. The UV–vis absorption spectra analysis indicated that the loading of Ag NPs can enhance the visible-light adsorption. And the decreased photoluminescence and the increased photocurrent demonstrated the high separation rate of photoinduced charge carriers owing to the successful heterojunction construction. Furthermore, the possible degradation pathways of RhB and TC were proposed according to HPLC-MS analysis. The results of radical trapping experiments indicated that O 2 − and OH were the primary active species during the photocatalytic degradation process.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 29
·7671-7678
·
IF 3.307
He Baoshan,Li Ming
In this paper, an electrochemical aptasensor based on gold electrode (AuE)-modified Ag@Au core-shell nanoparticles was prepared. The surface of AuE was modified with Ag@Au core-shell nanoparticles to elevate APT binding sites and accelerate electron transfer properties between the electrode and ferrocene (Fc). When SM 2 existed, the aptamer conformation would change and the response current intensity would increase because the Fc was pulled closer to the electrode surface. Subsequently, through a series of conditional optimization analysis, the optimal values of volume of Ag@Au core-shell, APT concentration, APT incubation time, and SM 2 incubation time were 9 μL, 0.2 μmol/L, 75 min, and 40 min, respectively. Under optimum conditions, the results of differential pulse voltammetry experiments showed that the linear relationship was good in the range of 0.1~50 ng/mL, Δ I ′ (μA) = 1.145 C (ng/mL) + 54.666, R 2 = 0.964, with a detection limit of 0.033 ng/mL. The spiked recovery for SM 2 in the pork samples was 92.6~101.0% and the relative standard deviation (RSD) was 2.7~4.1%, which indicated that the proposed aptasensor exhibited desirable performance in actual sample analysis.
An electrochemical aptasensor based on gold electrode-modified Ag@Au core-shell nanoparticles was prepared. The detection principle was on the basis of the change of current signal of DPV in Tris-HCl buffer solution before and after incubation of SM 2 . After the formation of APT-SM 2 complex, the ferrocene modified on the aptamer was pulled closer to the electrode surface and sped up the electron transfer rate.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Xuesen Wu,Yidong Hu,Yu Wang,Yansong Zhou,Zhonghui Han,Xiaoli Jin,Gang Chen
A novel ternary Ag 2 CO 3 /Ag/AgNCO Z-scheme heterojunction with excellent visible-light-driven photocatalytic performance was fabricated. The O 2 − and, h + were proved to be the photocatalytic active substances for the degradation of Rhodamine B (RhB) in Ag 2 CO 3 /Ag/AgNCO. Compared to pristine Ag 2 CO 3 and AgNCO, the enhanced photocatalytic activities of Ag 2 CO 3 /Ag/AgNCO could be attributed to the low resistance for interfacial charge transfer and desirable absorption capability. In addition, the Z-scheme photocatalytic mechanism is proved by the discussion of the band structure. This work could offer a new insight into the design and fabrication of advanced materials with Z-scheme structures for the efficient treatment of persistent pollutants in wastewater.
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MATERIALS & DESIGN
·
2018
·
IF 4.525
Li-Ping Wu,Ying-Zhan Li,Bi-Jia Wang,Zhi-Ping Mao,Hong Xu,Yi Zhong,Lin-Ping Zhang,Xiao-Feng Sui
Environmental-friendly cellulose-derived sponges were employed as porous templates to achieve uniform Ag deposition via a facile and economical electroless plating method. SEM and BET results confirmed an Ag layer was deposited on cellulose composite sponges without damaging the porous structure. XPS and XRD analysis demonstrated substantial interactions between porous substrates and Ag particles. When utilized as electromagnetic interference (EMI) shielding materials, a 3.2 mm thick silver-plated sponge exhibited a total shielding effectiveness ( SE total ) value of as high as 120.85 dB in the frequency range of 10–1500 MHz when the plating time was 120 min. Moreover, the conductive sponges displayed absorption-dominant mechanism to alleviate secondary radiation, making them promising candidates as high EMI shielding materials.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Yang-Yi Liu,Han-Ping Zhang,Bin Zhu,Han-Wen Zhang,Liang-Dong Fan,Xiao-Yan Chai,Qian-Ling Zhang,Jian-Hong Liu,Chuan-Xin He
In the past few decades, much attention has been paid to developing electrocatalysts with low cost and high efficiency for the hydrogen evolution reaction (HER) because of its potential impact on the energy fields. Besides, recent research demonstrates that interfaces play an important role in the electrocatalytic process. Herein, C/N-co-doped Pd coated Ag (Ag@Pd) nanowires (NWs) were prepared through a calcination process. In this process, the C/N–Ag@Pd interfaces consisted by the Pd-N bonds and the core/shell structure of Ag@Pd were formed. The effect of the calcination temperature on the formation of the C/N–Ag@Pd interfaces were investigated in detail. Moreover, C/N-co-doped Ag@Pd NWs exhibited excellent catalytic activity for HER with a small overpotential of 111 mV to afford a current density of 10 mA cm −2 , a low Tafel slope of 64 mV Dec −1 and good stability. The relationship between the HER activity and the C/N–Ag@Pd interfaces were built. Furthermore, such design principle for constructing interfaces between noble metal alloys and C/N by direct sintering can offer a new strategy for the developing more efficient electrocatalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Long Li,Jibran Iqbal,Ying Zhu,Peng Zhang,Wanchao Chen,Amit Bhatnagar,Yiping Du
In the present study, the potential of synthesized chitosan/Ag-substituted hydroxyapatite nanocomposite beads to remove basic dye, heavy metal and microbes from aqueous solutions was investigated. Beads were prepared in different ratios via embedding of Ag-hydroxyapatite (Ag-HA) into chitosan (CS) solution. The beads were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) in order to get an insight of the functional groups and morphology. Batch adsorption studies were conducted with copper ions (Cu (II)) and rhodamine B (RhB) dye by changing several parameters such as Ag-HA to Cs ratio, contact time, solution pH and initial concentration of pollutants. The antibacterial efficiency of beads was tested under dynamic contact conditions against commonly found bacteria in water, Escherichia coli . The adsorption isotherm data were best fitted with Langmuir model. The maximum Langmuir adsorption capabilities for Cu (II) ions and rhodamine B were found to be 40.11 mg/g and 127.61 mg/g, respectively. The adsorption process could be best described by pseudo-second-order kinetic model for both rhodamine B and Cu(II). The percentage removal efficiency of Cu (II) and rhodamine B from tap water and untreated river water ranged from 86.7 to 94.4% along with 99.99% of decontamination of microbial load .
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