JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Sijia Chen,Qidi Chen,Daoping Cai,Hongbing Zhan
Defect-mediated engineering has been proven as a novel and effective strategy to integrate two individual materials into a nanocomposite to boost the performance. In the present work, nanocomposite of partially-unzipped stacked-cup carbon nanofibers (PUSCNFs) decorated with platinum nanoparticles (Pt NPs) have been successfully synthesized through the defect-mediated formation method. Owing to the introduction of abundant structural defects during the chemical oxidation process , Pt NPs with an average diameter of 2–3 nm were uniformly anchored on the PUSCNFs without any surfactant involved. As comparison, the Pt NPs grown on the stacked-cup carbon nanofibers (SCNFs) possessed markedly larger nanoparticle size and trended to aggregate. The electrochemical properties of the nanocomposite-modified electrodes for biosensing were examined. Our results showed the Pt-PUSCNFs nanocomposite possessed optimal electrocatalytic activities and biosensing performance for detection of biomolecules, which could be attributed to a synergistic effect between the PUSCNFs and Pt NPs on electron transport and catalytic properties. We anticipate that the PUSCNFs may be a potential support material for construction of nanocomposites with good performance.
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Materials Science & Engineering C-Materials for Biological Applications
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2016
·
IF 3.42
Qian Tang,Zai-yong Li,Yu-bo Wei,Xia Yang,Lan-tao Liu,Cheng-bin Gong,Xue-bing Ma,Michael Hon-wah Lam,Cheuk-fai Chow
A photoresponsive surface molecularly imprinted polymer for uric acid in physiological fluids was fabricated through a facile and effective method using bio-safe and biocompatible ZnO nanorods as a support. The strategy was carried out by introducing double bonds on the surface of the ZnO nanorods with 3-methacryloxypropyltrimethoxysilane. The surface molecularly imprinted polymer on ZnO nanorods was then prepared by surface polymerization using uric acid as template, water-soluble 5-[(4-(methacryloyloxy)phenyl)diazenyl]isophthalic acid as functional monomer, and triethanolamine trimethacryl ester as cross-linker. The surface molecularly imprinted polymer on ZnO nanorods showed good photoresponsive properties, high recognition ability, and fast binding kinetics toward uric acid, with a dissociation constant of 3.22 × 10 − 5 M in aqueous NaH 2 PO 4 buffer at pH = 7.0 and a maximal adsorption capacity of 1.45 μmol g − 1 . Upon alternate irradiation at 365 and 440 nm, the surface molecularly imprinted polymer on ZnO nanorods can quantitatively uptake and release uric acid.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Wenqin Wu,Yibin Li,Jiayi Jin,Huimin Wu,Shengfu Wang,Qinghua Xia
In this paper, three-dimensional flower-like Ni 7 S 6 was successfully synthesized by a facile one-pot hydrothermal method . The prepared materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, and electrochemical testing. Electrochemical measurements indicated that the three-dimensional flower-like Ni 7 S 6 exhibited excellent electrocatalytic activity towards hydrogen peroxide and glucose. The sensor based on Ni 7 S 6 performed amperometric sensing of hydrogen peroxide in a wide linear range from 0.005 mM to 20.5 mM with a low detection limit of 0.15 μM (signal to noise ratio of 3) and high sensitivity of 37.77 μA mM −1 cm −2 . Meanwhile, the sensor also showed a linear response range of glucose from 0.005 mM to 3.7 mM, with high sensitivity of 271.80 μA mM −1 cm −2 and low detection limit of 0.15 μM.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 20
·期 5
·1377-1389
·
IF 2.327
Hui Yuchen,Ma Xiaoyan,Qu Fengjin,Chen Fang,Yu Jie,Gao Yan
A facile strategy is developed to fabricate an Au-CMCD/PCMCD electrode with high efficiency, universal, and selectivity electrocatalysis through electro-depositing carboxymethyl-β-cyclodextrins with gold nanoparticles (Au-CMCD) followed by employing electro-polymerization carboxymethyl-β-cyclodextrin (PCMCD). The chemical structure, microstructure, electrochemical activity, and electrocatalytic properties of Au-CMCD/PCMCD electrode are investigated. Due to the synergistic effect of the PCMCD and Au-CMCD layers, the as-prepared electrode exhibits an outstanding enhancement of universal electrocatalytic activity to eight kinds of crucial biomolecules and drugs, such as chloramphenicol, thymine, and glucose. Then, as a target analyte, glucose is used to investigate the sensing performances of Au-CMCD/PCMCD electrode. The amperometric detection of glucose shows a wide linear range expanding to 0.001∼110 mM with a low detection limit of 0.99 μM. More importantly, the absorption effect of PCMCD is stronger to glucose than other interfering species, which is favorable to avoid the influence of possible interfering substances. Furthermore, the glucose sensors reveal good stability and repeatability.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 3
·1235-1241
·
IF 4.831
Lin Peipei,Chai Fenglian,Zhang Ruiqiao,Xu Guiyun,Fan Xiaojian,Luo Xiliang
The work describes the synthesis of a nanocomposite consisting of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with gold nanoparticles (AuNPs) by electropolymerization of EDOT in a solution containing colloidal AuNPs. The nanocomposite possesses good conductivity and a 3D microporous network structure owing to the presence of AuNPs. These act as both conductive dopant and template for the growth of the microporous polymer. A glassy carbon electrode modified with the nanocomposite exhibits excellent electrocatalytic activity towards oxidation of nitrite. Best operated at a voltage of 0.8 V (vs. Ag/AgCl), it is capable of detecting nitrite in the 0.2 to 1400 μM concentration range, with a detection limit of 60 nM.
A highly sensitive and selective electrochemical sensor for nitrite was developed based on the electrodeposited nanocomposite of conducting polymer poly(3,4-ethylenedioxythiophene) doped with gold nanoparticles.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Lei Hou,Hang Zhao,Siyi Bi,Yumeng Xu,Yinxiang Lu
A simple and cost-effective sandpaper-supported copper framework (SSCF) was innovatively constructed by a novel “scribing-seeding-plating” approach and its application to non-enzymatic glucose determination was systematically investigated. The morphology, composition , crystalline structure of copper nanocoatings and sandpaper substrate were detailedly characterized with SEM, XPS, EDX and XRD, respectively. Processing parameters were optimized by central composite design to obtain an optimal conductivity of 4.69 × 10 7 S·m −1 for copper nanocoatings. The SSCF exhibits excellent performance, with a wide linear range from 1.0 μM to 4.6 mM, a high sensitivity of 2165.5 μA mM −1 cm −2 , a low determination limit of 30 nM (S/N = 3), favorable selectivity and stability. The good electrocatalytic capacity could be attributed to the coordination between high-aspect-ratio porous microstructures of large surface area and copper nanocoatings of excellent catalytic ability. Finally, low relative standard deviations (1.59%–2.76%, n = 10) and good recoveries (101.13%–102.69%) for enzymeless glucose determination in human serum samples and commercial drinks strongly validated satisfactory serviceability of SSCFs in medical diagnostics and food manufacturing.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2017
·Vol. 21
·期 10
·2887-2898
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IF 2.316
Ouyang Ruizhuo,Zong Tianyu,Su Yongfu,Jia Pengpeng,Zhou Shuang,Yang Yang,Feng Kai,Chang Haizhou,Chen Ying,Zhao Yuefeng,Xiong Fei,Miao Yuqing
A new type of Ni 2+ -loaded MWCNT composite was prepared by mixing carboxylated multiwalled carbon nanotubes (MWCNTs) and Ni 2+ ions and allowing them to interact electrostatically. The resulting composite was subsequently used as an electrocatalyst for glucose (Glu) oxidation. Compared with electrodes modified through the addition of free Ni 2+ ions or MWCNTs, the Ni 2+ /MWCNT composite electrode showed greatly improved properties such as hydrophilicity. Investigations of the Ni 2+ /MWCNT composite electrode via inductively coupled plasma atomic emission spectroscopy and nitrogen adsorption–desorption isotherms verified that Ni 2+ ions had been adsorbed onto the surfaces of the MWCNTs in the composite. As expected, a Ni 2+ /MWCNT composite-based sensor showed extraordinary electrocatalytic performance in Glu oxidation. In the concentration range 0–4.3 mM, a good linear relationship between the Glu added and the current generated was observed, with a correlation coefficient ( R
2 ) of 0.9988. The detection limit and sensitivity were calculated to be 0.081 μM and 2285 μA mM −1 cm −2 , respectively. Finally, the new method was successfully applied to determine the Glu in a human blood sample. Recoveries of >100%, indicative of high reliability, accuracy, and precision, were obtained.
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Analytical Methods
·
2016
·Vol. 8
·期 17
·3481-3487
·
IF 1.915
Lili Wang,Wencheng Gong,Fang Wang,Zhenya Yu,Zilin Chen
An efficient bienzyme nanocomposite film-based biosensor for L-amino acid recognition has been developed and characterized. The biosensor was fabricated by immobilizing horseradish peroxidase (HRP) and L-amino acid oxidase (L-AAODx) in poly(toluidine blue) film (polyTB) at the surface of a multi-walled carbon nanotube (CNTs) modified glassy carbon electrode (GCE). Only L-amino acids can be electrochemically oxidized by L-AAODx in the presence of oxygen (O2) to produce hydrogen peroxide (H2O2), which can be further reduced to H2O by HRP at a low potential of −0.1 V. The concentration of L-amino acids was estimated by the reduction current of H2O2. The polyTB film, acting as the enzyme-immobilization carrier and redox mediator, accelerated electron transfer between analytes and the electrode. At the same time, CNTs with excellent conductivity and strong adsorption ability enhanced the utilization of the enzymes. The performance of this biosensor was evaluated by electrochemical techniques and it showed high selectivity and fast response for the chiral recognition of L-amino acids, including L-tryptophan (L-Trp), L-phenylalanine (L-Phe) and L-tyrosine (L-Tyr). The low potential reduced the interference of some coexisting biomolecules for the determination of the L-amino acids. The recovery of the three amino acids in milk indicated the feasibility of this biosensor for use in complex samples.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Ni Hui,Fenglian Chai,Peipei Lin,Zhiling Song,Xiaotian Sun,Yinan Li,Shuyan Niu,Xiliang Luo
Conducting polymer polyaniline (PANI) nanowire arrays were electrochemically in situ synthesized on the surface of glassy carbon electrodes, which were modified with self-assembled multi-walled carbon nanotubes (CNTs) networks. The ordered PANI nanowire arrays and CNTs networks were integrated to create 3D nanostructured PANI/CNTs composites. Owing to their unique microstructure and conductivity, the PANI/CNTs nanocomposite exhibited excellent electrical properties such as remarkable supercapacitor performance and catalytic activity toward nitrite electrochemical reduction . It was found that the PANI/CNTs nanocomposite was capable of delivering high specific capacitance and showed excellent cycling stability. Moreover, it could be utilized as an electrochemical sensor for the detection of nitrite, with an outstanding sensitivity, low detection limit (6.1 μM, a signal to noise ratio of 3) and a fast response time of less than 5 s.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Weibo Li,Dongping Qian,Qiuhong Wang,Yubin Li,Ning Bao,Haiying Gu,Chunmei Yu
In this work, an origami paper-based analytical device for glucose biosensor by employing fully-drawn pencil electrodes has been reported. The three-electrode system was prepared on paper directly by drawing with nothing more than pencils. By simple printing, two separated zones on paper were designed for the immobilization of the mediator and glucose oxidase (GOx), respectively. The used paper provides a favorable and biocompatible support for maintaining the bioactivities of GOx. With a sandwich-type scheme, the origami biosensor exhibited great analytical performance for glucose sensing including acceptable reproducibility and favorable selectivity against common interferents in physiological fluids. The limit of detection and linear range achieved with the approach was 0.05 mM and 1–12 mM, respectively. Its analytical performance was also demonstrated in the analysis of human blood samples. Such fully-drawn paper-based device is cheap, flexible, portable, disposable, and environmentally friendly, affording great convenience for practical use under resource-limited conditions. We therefore envision that this approach can be extended to generate other functional paper-based devices.
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高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Cheng Qin,Ji Liudi,Wu Kangbing,Zhang Weikang
Using starch as the carbon precursor and different-sized ZnO naoparticles as the hard template, a series of porous carbon materials for electrochemical sensing were prepared. Experiments of scanning electron microscopy, transmission electron microscopy and Nitrogen adsorption-desorption isotherms reveal that the particle size of ZnO has big impacts on the porous morphology and surface area of the resulting carbon materials. Through ultrasonic dispersion of porous carbon and subsequent solvent evaporation, different sensing interfaces were constructed on the surface of glassy carbon electrode (GCE). The electrochemical behaviors of ascorbic acid (AA), dopamine (DA) and uric acid (UA) were studied. On the surface of porous carbon materials, the accumulation efficiency and electron transfer ability of AA, DA and UA are improved, and consequently their oxidation signals enhance greatly. Moreover, the interface enhancement effects of porous carbon are also controlled by the particle size of hard template. The constructed porous carbon interface displays strong signal amplification ability and holds great promise in constructing a sensitive platform for the simultaneous determination of AA, DA and UA.
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PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
·
IF 7.476
Xiangyu Jiang,Fenghua Geng,Yongxiang Wang,Jinhua Liu,Peng Qu,Maotian Xu
Quantitative fluorescence turn-on and colorimetric detection of glutathione (GSH) with rapid speed, low cost have attained much attention. Herein, we developed a sensitive fluorescence turn-on and colorimetric sensor for GSH based on the inner-filter effect (IFE), which is the first time to select oxTMB and TMPyP as the IFE absorber and fluorophore pair, respectively. The absorption band of oxTMB matches well with the emission band of TMPyP in the IFE-based fluorescent assay. In the absence of GSH, the absorption peak of oxTMB at 652 nm significantly overlaps with the emission of TMPyP, resulting in the efficient IFE and inhibition of the fluorescence of TMPyP. In the presence of GSH, the absorption intensity at 652 nm decreases, generating the recovery of the fluorescence of TMPyP. Therefore, this approach is demonstrated to be a novel candidate for detection of GSH, with high sensitivity and selectivity. The linear dynamic range for the concentrations of GSH is between 0.1 μM to 20 μM along with a limit of detection (LOD) of about 30 nM (calculated LOD as 3 σ /slope). Finally, this novel sensor was successfully applied for GSH detection in fetal calf serum , and satisfactory recovery was achieved.
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高影响因子
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