JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2016
·Vol. 49
·期 28
·285105
·
IF 2.772
Jiaqi Pan,Jing Li,Xiufang Zhang,Yingying Zheng,Can Cui,Zhiyan Zhu,Chaorong Li
Cotton cellulose nanofibers (CCNFs)/In2S3/Ag–CdS nanocomposites were prepared by a typical technical route which combined electrospinning and a chemical method. The results showed that the CCNFs/In2S3/Ag–CdS nanocomposites had a remarkable visible light photocatalytic property and cycling stability, which displayed a significant enhancement compared with that of pure In2S3. Through analysis, this enhancement could be mainly attributed to the multilevel structure of the composites.
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Materials Research Express
·
2016
·Vol. 3
·期 6
·065018
·
IF 0.968
Pinhua Zhang,Guangliang Cui,Chuanhai Xiao,Mingzhe Zhang,Li Chen,Changmin Shi
We fabricated an Ag decorated Cu (Ag@Cu) nano/microstructure ordered array by facile template-free 2D electrodeposition combined with a galvanic reduction method for SERS applications. The Cu nano/microstructure ordered arrays were first synthesized by a 2D electrodeposition method, then Ag nanocubes were decorated on the arrays by galvanic reduction without any capping agent. The pollution-free surface and edge-to-face heterostructure of Ag nanocubes and Cu nano/microstructure arrays provide the powerful field-enhancements for SERS performance. The results verified that the Ag@Cu nano/microstructure ordered arrays have excellent activity for 4-Mercaptopyridine, and the sensitivity limit is as low as 10−8 M. Therefore, this facile route provides a useful platform for the fabrication of a SERS substrate based on nano/microstructure ordered arrays.
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SENSORS
·
2017
·Vol. 17
·期 10
·2214
·
IF 2.677
Fan Zhou,Weixuan Jing,Pengcheng Liu,Dejun Han,Zhuangde Jiang,Zhengying Wei
In this paper, the performance of a zinc oxide (ZnO) nanorod-based enzymatic glucose sensor was enhanced with silver (Ag)-doped ZnO (ZnO-Ag) nanorods. The effect of the doped Ag on the surface morphologies, wettability, and electron transfer capability of the ZnO-Ag nanorods, as well as the catalytic character of glucose oxidase (GOx) and the performance of the glucose sensor was investigated. The results indicate that the doped Ag slightly weakens the surface roughness and hydrophilicity of the ZnO-Ag nanorods, but remarkably increases their electron transfer ability and enhances the catalytic character of GOx. Consequently, the combined effects of the above influencing factors lead to a notable improvement of the performance of the glucose sensor, that is, the sensitivity increases and the detection limit decreases. The optimal amount of the doped Ag is determined to be 2 mM, and the corresponding glucose sensor exhibits a sensitivity of 3.85 μA/(mM·cm2), detection limit of 1.5 μM, linear range of 1.5 × 10−3–6.5 mM, and Michaelis-Menten constant of 3.87 mM. Moreover, the glucose sensor shows excellent selectivity to urea, ascorbic acid, and uric acid, in addition to displaying good storage stability. These results demonstrate that ZnO-Ag nanorods are promising matrix materials for the construction of other enzymatic biosensors.Keywords:ZnO nanorod;doping;surface morphology;wettability;glucose sensor
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 9
·9370-9378
·
IF 1.798
Wang Chao,Sun Yanli,Yu Xiaohui,Ma Daqian,Zheng Jiao,Dou Peng,Cao Zhenzhen,Xu Xinhua
A novel, stable and sensitive non-enzymatic glucose biosensor based on bimetallic hollow Ag/Pt nanoparticles and the reduced graphene oxide (rGO) was obtained. The hybrid of bimetallic hollow Ag/Pt nanoparticles-reduced graphene oxide (HAg/PtNPs-rGO) was prepared by a galvanic replacement reaction and the thermal reduction of graphene oxide. Thermal reduction has been highly effective in producing graphene-like films which can render a stable substrate for hollow Ag/Pt nanoparticles. The morphology and composition of the prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry and Fourier transform infrared spectra. Cyclic voltammetry measurements demonstrated that the biosensor decorated by HAg/PtNPs-rGO can directly detect glucose and show a superior electro catalytic activity. The results of amperometric method showed a desirable amperometric response with a sensitivity of 129.32 μA mM −1 cm −2 , a linear range of 0.003–7.72 mM (R 2 = 0.9943), a fast response time (less than 3 s) and a low detection limit of 1.8 μM (S/N = 3). In addition, the fabricated sensor also had good selectivity, reproducibility and long-term stability. The sensor modified by HAg/PtNPs-rGO could make a promising application in glucose determination.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Xin Wang,Zhe Zhao,Dingrong Ou,Baofeng Tu,Daan Cui,Xuming Wei,Mojie Cheng
Ag/TiO 2 nanocomposites comprising of Ag clusters on TiO 2 nanocrystal surfaces are of great significance in catalysts and advanced functional materials. Herein a novel method to synthesize Ag/TiO 2 nanocomposites with Ag clusters under 2 nm on TiO 2 nanocrystal surfaces have been developed. The success of this method relies on a silver mirror reaction in toluene, which refers to the reduction of silver-dodecylamine complexes by acetaldehyde in the presence of mono-dispersed TiO 2 nanocrystals. The prepared Ag/TiO 2 nanocomposites have been characterized by FT-IR spectra, UV–vis absorption spectra, X-ray diffraction (XRD) analysis, ultra high resolution scanning electron microscope (Ultra-HRSEM), high resolution transmission electron microscope (HRTEM) and X-ray photoelectron spectra (XPS). Catalytic activity of Ag/TiO 2 nanocomposites is evaluated for the reduction of p -nitrophenol (4-NP) into p -aminophenol (4-AP) by NaBH 4 . Results demonstrate that Ag/TiO 2 nanocomposites have shown an outstanding catalytic activity as well as a good stability in successive reduction of 4-NP. Noticeably, TOF of Ag/TiO 2 -0.75 nanocomposites obtained in this work is the highest among Ag based catalysts previously reported.
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NANOTECHNOLOGY
·
2016
·Vol. 27
·期 38
·385603
·
IF 3.573
Piao Liu,Jin Ma,Sha Deng,Kai Zeng,Dunying Deng,Wei Xie,Anxian Lu
Printed-electronics inks belong to a class of novel functional conductive inks that can be used to form high-precision conducting lines or circuits on various flexible substrates. Previous studies have reported conductive inks produced by the reduction and membrane separation method for use in flexible devices. However, it remains a challenge to synthesize conductive inks with high electrical properties at low sintering temperatures, which restricts their range of applications. Herein, we prepare inkjet-printed patterns of conductive inks consisting of Ag nanohexagonal platelets (AgNHPs) as the main component and containing graphene (GE) in different contents. It is found that GE improves the electrical conductivity of the patterns when sintering is done at relatively low temperatures. For instance, when the GE content is 0.15 mg ml−1, the resistivity is the lowest. When sintering is done at 150 °C, the resistivity (2.7 × 10–6 Ω · cm) of the GE-AgNHPs conductive ink (GE: 0.15 mg ml−1) is 14% of that of the AgNHPs conductive ink; on the other hand, after sintering at 50 °C, this ratio is 2%. It is also found that, with the increase in GE content, the resistivity of the GE-AgNHPs conductive ink increases. This study on GE-AgNHPs conductive inks sintered at low temperatures should further the development of flexible touch screens.
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Solar RRL
·
2017
·
IF 0
Hailong Wang,Lei Miao,Sakae Tanemura
Since introduction of inorganic metallic salt serves as an inducer for modulating crystalline nucleation and overgrowth, we have synthesized highly monodispersed silver nanoparticles (AgNPs) (diameter: 48.7–411.9 nm) in the shape of polyhedral quasi-spheres via a household microwave oven. The localized surface plasmon resonance (LSPR) absorption spectrum of AgNPs exhibits a good match to the solar spectrum in the UV to near infrared wavelength range. Consequently, AgNPs dispersed in deionized (DI) water have a great potential for efficient solar heat collecting, able to convert both hot steam and its clustering nanobubbles into macro-bubbles (macroscopic bubbles) in a fast and consecutive manner. The maximum values of solar thermal conversion efficiency, rate of steam, and diameter of the clustered macroscopic bubbles obtained in the preliminary experiments under the best conditions are 82.45%, 16.8 g/(AM1.5 · m 2 · min), and 2.4 cm, respectively. Here we show that the designated system has fast dynamics of steam generation, as well as easy and cost-effective scale-up capability, suggesting that the steam generation system using AgNPs might be feasible after further development.
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Advanced Materials Technologies
·
2017
·Vol. 3
·期 1
·1700206
·
IF 0
Li Liu,Qiang Lu,Shuanglei Yang,Jiang Guo,Qingyong Tian,Weijing Yao,Zhanhu Guo,Vellaisamy A. L. Roy,Wei Wu
The next-generation energy storage devices are expected to be flexible, cost-effective, and high power storage devices to complement or replace rigid batteries and conventional capacitors for wearable electronic device applications. In this regard, a scalable and cost-effective fabrication of all-printed solid-state microsupercapacitors (MSCs) involving self-template synthesis of Ag@PPy nanocomposites (NCs) as active materials is demonstrated. The as-obtained Ag@PPy NCs exhibit high specific capacitance and are formulated as screen printing inks that are printed to form electrodes on plastic substrates. The Ag current collectors, Ag@PPy NC electrodes, and gel electrolyte are screen printed and fabricated as flexible all-solid-state MSCs exhibiting excellent capacitive features, including remarkable mechanical flexibility of 77.6% after 1000 bending cycles, superior stability of 82.6% after 10000 cycles, and high energy density of 0.00433 mW h cm −2 . The Ag@PPy inks are easily prepared and more than 40 printed MSCs are fabricated on flexible plastic substrates in less than 30 min. It is envisioned that the fully printed flexible all-solid-state MSCs could be a promising candidate for flexible energy storage devices.
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JOURNAL OF FLUORESCENCE
·
2017
·Vol. 27
·期 4
·1421-1426
·
IF 1.461
Mao Mi,Deng Chun,He Yu,Ge Yili,Song Gongwu
We developed a sensitive and selective method for detection of 4-Nitrophenol (PNP) using Ag nanoclusters (NCs) as fluorescence probe. Bovine serum albumin (BSA) was used as the template for preparing Ag NCs via wet chemistry. The fluorescence of as-prepared Ag NCs was significantly quenched in the presence of PNP, showing excellent linear relationships between the quenching degree of the fluorescence intensity and the concentrations of PNP in the range of 0.5 μM to 60 μM. The fluorescence quenching mechanism was also investigated. Furthermore, this method was applied for the recognition of PNP in environmental samples.
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International Journal of Polymeric Materials and Polymeric Biomaterials
·
2016
·
IF 1.667
Heqing Fu,Lingyuan Liao,Xiaoya Li,Weifeng Chen
First, modified halloysite-Fe3O4 nanotubes (mHNT-Fe3O4) were synthesized. Second, mHNT-Fe3O4-Ag was synthesized by reduction process. Third, mHNT-Fe3O4-Ag was covalently incorporated into the polyurea (PUA) matrix and the mHNT-Fe3O4-Ag/PUA nanocomposites were prepared. The mHNT-Fe3O4-Ag was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, UV-vis absorption spectra, transmission electron microscopy, thermogravimetric analysis, and dynamic mechanical analysis. The experimental results shown that thermal stability, tensile strength, and storage modulus of nanocomposites were improved with the increasing of the content of mHNT-Fe3O4-Ag. Meanwhile, mHNT-Fe3O4-Ag/PUA nanocomposites had excellent magnetic properties and good antibacterial property.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2016
·Vol. 80
·期 3
·709-718
·
IF 1.473
Zhang Libo,Zhang Gengwei,Wang Shixing,Peng Jinhui,Fu Likang
Abstract We prepared the carboxymethyl-dithiocarbamate-functionalized silica nanoparticle for detecting silver ions in aqueous media. The functionalized silica nanoparticles were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy and thermogravimetric analysis. The functionalized silica nanoparticles realize highly sensitive and selective detection for Ag + in aqueous solution with an apparent color change over a pH range of 4–6 and under interfering ions. The functionalized silica nanoparticles allow fast detection for Ag + at 90 °C with a low minimum detectable concentration (0.09 mM). And a remarkable color change also occurs in the presence of Ag + solutions containing EDTA. This developed technique can easy and fast detect silver ions by the naked eye without using any sophisticated instrumentation. Graphical Abstract
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Jingxue Yuan,Yao Feng,Xue Ma,Xin Yang,Zhengjun Cheng
In this work, the copper nanoclusters with red fluorescence (CuNCs@DAMP) were prepared with 4,6-diamino-2-mercaptopyrimidine (DAMP) as a ligand by a simple one-pot method, but the CuNCs@DAMP couldn't respond to silver ions (Ag + ) and L-cysteine (Cys). Then glutathione (GSH) modified CuNCs@DAMP (GSH-CuNCs@DAMP) with short preparation time (10 min) was found that not only its maximum emission peak underwent a significant blue-shift (from 705 to 605 nm), but also it could selectively detect Ag + and Cys with LOD (limit of detection) of 0.018 and 0.19 μM and the linear ranges of 0.05–10.0 and 0.6–73.0 μM. Meanwhile, the synthetic conditions of GSH-CuNCs@DAMP and the fluorescence quenching mechanisms of GSH-CuNCs@DAMP by Ag + and Cys were studied intensively. Furthermore, the CuNCs was successfully employed to monitor Ag + and Cys in real samples with good recoveries, which hinted that a simple, fast and sensitive method was provided for Ag + and Cys assays.
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