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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Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 18
·2813-2820
·
IF 4.776
Ya Peng,Yu Liu,Xiaolin Lu,Shouju Wang,Maomao Chen,Wenchao Huang,Zhiyou Wu,Guangming Lu,Liming Nie
Core–shell metal nanostructures with versatile functions have attracted extensive attention and are highly desirable for imaging and therapeutic purposes. Among them, gold and silver nanomaterials are widely explored for biological applications due to their unique properties. Despite a wide range of applications, limited enhancement ability and insufficient photothermal performance have hampered their further development. In this work, a novel multifunctional nanoprobe, a Au@Ag nanoplate (NP), is fabricated with a biocompatible surface in the aqueous phase. The as-obtained nanocomposite possesses a unique core–shell triangular configuration, sharp apexes, and a large specific surface area, exhibiting strong absorption at 780 nm. PEG–Au@Ag NPs depict highly sensitive photoacoustic imaging (PAI) capacity and extraordinary photothermal conversion efficiency (η = 73%) under 808 nm laser irradiation. Raman signals are multiplied benefitting from the enhanced surface plasma resonance contributed by the silver layer and sharp spears. PAI provides deeper pathological information while Raman detection presents superficial optical properties. Their union forms comprehensive scale coverage for disease imaging and localization. Outstanding photothermal therapy and antibacterial efficacy are observed on animal disease models. This novel multifunctional nanocomposite not only holds great potential as an excellent contrast agent for the combination of PAI and Raman evaluation, but also allows tumor and infection therapy as well as the corresponding therapeutic monitoring.
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Nanomaterials
·
2018
·Vol. 8
·期 11
·872
·
IF 3.504
Furu Zhong,Zhaofeng Wu,Jixi Guo,Dianzeng Jia
Picric acid (PA) is an organic substance widely used in industry and military, which poses a great threat to the environment and security due to its unstable, toxic, and explosive properties. Trace detection of PA is also a challenging task because of its highly acidic and anionic character. In this work, silver nanoparticles (AgNPs)-decorated porous silicon photonic crystals (PS PCs) were controllably prepared as surface-enhanced Raman scattering (SERS) substrates using the immersion plating solution. PA and Rhodamine 6G dye (R6G) were used as the analyte to explore the detection performance. As compared with single layer porous silicon, the enhancement factor of PS PCs substrates is increased to 3.58 times at the concentration of 10−6mol/L (R6G). This additional enhancement was greatly beneficial to the trace-amount-detection of target molecules. Under the optimized assay condition, the platform shows a distinguished sensitivity with the limit of detection of PA as low as 10−8mol/L, the linear range from 10−4to 10−7mol/L, and a decent reproducibility with a relative standard deviation (RSD) of ca. 8%. These results show that the AgNPs-modified PS PCs substrates could also find further applications in biomedical and environmental sensing.Keywords:porous silicon photonic crystals;Ag nanoparticles;optical properties;SERS.
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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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ACS Nano
·
2018
·
IF 13.709
Shanshan Yin,Dong Zhao,Qing Ji,Yonggao Xia,Senlin Xia,Xinming Wang,Meimei Wang,Jianzhen Ban,Yi Zhang,Ezzeldin Metwalli,Xiaoyan Wang,Ying Xiao,Xiuxia Zuo,Shuang Xie,Kai Fang,Suzhe Liang,Luyao Zheng,Bao Qiu,Zhaohui Yang,Yichao Lin,Liang Chen,Cundong Wang,Zhaoping Liu,Jin Zhu,Peter Müller-Buschbaum,Ya-Jun Cheng
Silicon (Si) has been regarded as one of the most promising anodes for next-generation lithium-ion batteries (LIBs) due to its exceptional capacity, appropriate voltage profile, and reliable operation safety. However, poor cyclic stability and moderate rate performance have been critical drawbacks to hamper the practical application of Si-based anodes. It has been one of the central issues to develop new strategies to improve the cyclic and rate performance of the Si-based lithium-ion battery anodes. In this work, super-small metal nanoparticles (2.9 nm in diameter) are in situ synthesized and homogeneously embedded in the in situ formed nitrogen-doped carbon matrix, as demonstrated by the Si/Ag/C nanohybrid, where epoxy resin monomers are used as solvent and carbon source. With tiny amount of silver (2.59% by mass), the Si/Ag/C nanohybrid exhibits superior rate performance compared to the bare Si/C sample. Systematic structure characterization and electrochemical performance tests of the Si/Ag/C nanohybrids have been performed. The mechanism for the enhanced rate performance is investigated and elaborated. The temperature-dependent I–V behavior of the Si/Ag/C nanohybrids with tuned silver contents is measured. Based on the model, it is found that the super-small silver nanoparticles mainly increase charge carrier mobility instead of the charge carrier density in the Si/Ag/C nanohybrids. The evaluation of the total electron transportation length provided by the silver nanoparticles within the electrode also suggests significantly enhanced charge carrier mobility. The existence of tremendous amounts of super-small silver nanoparticles with excellent mechanical properties also contributes to the slightly improved cyclic stability compared to that of simple Si/C anodes.
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SOLAR ENERGY
·
2018
·
IF 4.374
Huajun Chen,Wenjie Tian,Wuxiu Ding
Metallic sliver-doped mesoporous Al 2 O 3 fibers (meso-Ag/Al 2 O 3 ) that can harvest visible light to speed up solar water purification, were synthesized by one-pot hydrothermal method. Insightful analyses of XRD, XRF and XPS of meso-Ag/ Al 2 O 3 verified that metallic silver occupied interstitial positions of Al 2 O 3 lattice forming interstitial solid solution. N 2 adsorption/desorption illustrated that meso-Ag/Al 2 O 3 exhibited significantly increases in the specific surface area, pore volume and average pore diameter after doping with silver. The UV–Vis diffuse reflectance spectra and disinfection performance indicated that meso-Ag/Al 2 O 3 can harvest visible light to promote the conversion of dioxygen to ROS for water disinfection compared with the widely used TiO 2 . With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 120 min with a small amount of material (8 mg/L) under simulated visible light.
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CRYSTENGCOMM
·
2019
·Vol. 21
·期 24
·3709-3720
·
IF 3.382
Shanshan Li,Qi Wang,Xinyu Song,Yuxiang Bu
Semiconductor-based materials as SERS-active substrates have gained significant attention because of their superior properties. However, to date, only few studies have been reported on the SERS performance of substrates fabricated using CdS-based composites. In this study, hollow sphere-like Ag/CdS nanocomposites (NCs) with multi-hot spots were successfully synthesized via a room-temperature solution route without the addition of surfactant. Especially, note that in our strategy, the cadmium ions in an aqueous solution originating from the self-template core dissolved with acid were retrieved and recycled via a simple approach, avoiding the wastage of resources and environmental problems. Moreover, a strong electromagnetic enhancement between two neighboring Ag nanoparticles (NPs) on the CdS sphere-like surface could be achieved by conveniently adjusting the amount of the AgNO3 reagent. Note that the as-prepared substrate with low loading of Ag presented superior SERS performance with the ultralow limit of detection of 10−12 mol L−1 for R6G and CV, much higher than that of many recently reported composite substrates. These significantly enhanced SERS effects are attributed to the combination of several contributions, including plasmonic coupling between Ag NPs, synergistic charge-transfer resonances in the Ag/CdS/dye molecule system, and cadmium defect-induced electrostatic forces. As a consequence, the present study not only develops a convenient, environmentally friendly approach for the fabrication of noble/CdS composites but also indicates the promising potential application of these composites as ideal SERS substrates in the detection of organic pollutants.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Mengyao Ouyang,Jian Wang,Bo Peng,Yujun Zhao,Shengping Wang,Xinbin Ma
A highly efficient Ag catalyst supported on a novel Ti-decorated spherical fibrous silica (Ag/Ti-KCC-1) was synthesized via a facile approach. Characterization of catalysts, including FT-IR, N 2 physisorption, TEM, ICP-OES and DRUV–vis was carried out to investigate the physicochemical properties of the catalyst, XPS, H 2 -TPR, H 2 -TPD and DMO-TGA were conducted to further elucidate the effect of Ti dopant. It is shown that the Ti additive is able to, (1) inhibit the aggregation of Ag; (2) induce electron transfer from Ti to Ag, which effect the Ag dispersion and the adsorption ability of the reactants on the catalyst surface. Proper amount of Ti additive provided a balanced coverage of both hydrogen and dimethyl oxalate (DMO) on catalyst surface, which is essential in promoting the performance of the catalyst in the hydrogenation of DMO. By using the novel 10Ag/0.02Ti-KCC-1 catalyst, a high MG yield of 93.0% under extremely high WHSV of 1.75 h −1 is achieved.
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ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yuting Zhang,Dongmei Deng,Xiaoli Zhu,Shuai Liu,Yan Zhu,Long Han,Liqiang Luo
Bimetallic Au-Ag/Co 3 O 4 nanofibers (Au-Ag/Co 3 O 4 NFs) were synthesized by an electrospinning method and calcination treatment. Due to the admirable synergic effect of electrocatalytic ability of Au and Ag, and the large surface-to-volume ratio of Co 3 O 4 nanofibers caused by their rough surface, the synthesized Au-Ag/Co 3 O 4 NFs were applied to a sensing platform for hydrogen peroxide oxidation . Using electrochemical techniques, the novel sensing platform based on Au-Ag/Co 3 O 4 NFs shows a wide linear concentration range with high detection sensitivity of 1241.1 μA mM −1 cm −2 . This sensitive sensor was also applied to determine H 2 O 2 from human breast cancer cells, indicating its great potential application in physiology and pathology.
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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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Polymers
·
2017
·Vol. 9
·期 11
·568
·
IF 3.364
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu
A new cyanuric-thiosemicarbazid (TSC-CC) chelating resin was synthesized and employed to selectively adsorb Ag+from acid solutions. The effects of acid concentration, initial concentration of Ag+, contact time and coexisting ions were investigated. The optimal acid concentration was 0.5 mol/L. The adsorption capacity of Ag+reached 872.63 mg/g at acid concentration of 0.5 mol/L. The adsorption isotherm was fitted well with the Langmuir isotherm model and the kinetic data preferably followed the pseudo-second order model. The chelating resin showed a good selectivity for the Ag+adsorption from acid solutions. Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Scanning electron microscopy/energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) were used to study the adsorption mechanism. The chelating and ionic interaction was mainly adsorption mechanism. The adsorbent presents a great potential in selective recovery Ag+from acid solutions due to the advantage of high adsorption capacity and adapting strongly acidic condition. The recyclability indicated that the (TSC-CC) resin had a good stability and can be recycled as a promising agent for removal of Ag+.Keywords:chelating resin;silver ions;selectivity;adsorption;mechanism
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