共查询到20条相似文献,搜索用时 0 毫秒
1.
X. C. Lu L. Song T. T. Ding Y. L. Lin C. X. Xu 《Russian Journal of Electrochemistry》2017,53(4):366-373
The rapid and simple detection of bisphenol A is very important for the safety and reproduction of organisms. Here, a sensitive and reliable electrochemical sensor was established for bisphenol A detection based on the high amplification effect of copper sulfide-multi-walled carbon nanotube (CuS–MWCNT) nanocomposites. The flower-like CuS–MWCNT were successfully synthesized by a simple hydrothermal method accompanied by polyvinylpyrrolidone (PVP). Compared with bare glassy carbon electrode (GCE), CuS–MWCNT modified GCE could amplify the electrochemical signals in about ten times, which was attributed to the synergistic effect of CuS and MWCNT. The MWCNT could increase the specific surface area of electrodes and improve the electrode activity. The integration of CuS could further enhance the electrode conductivity as well as accelerate the electron transfer rate. Raman spectra and transmission electron microscope (TEM) were used to characterize the successful fabrication of CuS–MWCNT nanocomposites and its uniform and monodispersed morphology. Under optimizing conditions, the oxidation currents of bisphenol A via the differential pulse voltammetric (DPV) showed a good linear relationship with its concentration in a wide range of 0.5–100 μM, with a detection limit of 50 nM. This electrochemical sensor of bisphenol A provided a convenient and economical platform with high sensitivity and reproducibility, which had great potential in environmental monitoring. 相似文献
2.
Electrocatalytic oxidation of nicotine at multiwalled carbon nanotube (MWCNT)–alumina-coated silica (ACS) nanocomposite modified glassy carbon electrode are described. The sensing performance of the MWCNT–ACS nanocomposite modified glassy carbon electrode for the electrooxidation of nicotine was investigated using cyclic voltammetry and amperometry in 0.1 M phosphate buffer solution (pH 8). The MWCNT–ACS nanocomposite modified glassy carbon electrode exhibited the abilities to decrease the electrooxidation potential, to prevent the electrode surface fouling, and to raise the current responses. The MWCNT–ACS nanocomposite responded rapidly to nicotine with a sensitivity of 1.786 A M?1 cm?2 and a detection limit of 1.42 μM (according to 3σ criterion). A signal almost 180 times more sensitive was obtained at MWCNT–ACS nanocomposite modified glassy carbon electrodes as compared to bare glassy carbon electrode. The nicotine oxidation potential obtained in this study is much lower than that at boron-doped diamond electrodes. 相似文献
3.
Wei Yi Duanguang Yang Hongbiao Chen Pengcheng Liu Jian Tan Huaming Li 《Journal of Solid State Electrochemistry》2014,18(4):899-908
In this study, we demonstrated a highly sensitive electrochemical sensor for the determination of glucose in alkaline aqueous solution by using nickel oxide single-walled carbon nanotube hybrid nanobelts (NiO–SWCNTs) modified glassy carbon electrode (GCE). The hybrid nanobelts were prepared by the deposition of SWCNTs onto the Ni(SO4)0.3(OH)1.4 nanobelt surface, followed by heat treatment at different temperatures ranging from 400 °C to 600 °C. The NiO–SWCNTs hybrid nanobelts modified electrode prepared at 500 °C displays enhanced electrocatalytic activity towards glucose oxidation, revealing a synergistic effect between the NiO and the deposited SWCNTs. The as-fabricated nonenzymatic glucose sensor exhibits excellent glucose sensitivity (2,980 μA cm?2 mM?1), lower detection limit (0.056 μM, signal/noise [S/N] ratio?=?3), and wider linear range (0.5–1,300 μM). Moreover, the sensor has been successfully used for the assay of glucose in serum samples with good recovery, ranging from 96.4 % to 102.4 %. 相似文献
4.
Platinum nanoparticles were successfully deposited within a multiwalled carbon nanotube (MWCNT)–Nafion matrix by a cyclic
voltammetry method. A Pt(IV) complex was reduced to platinum nanoparticles on the surface of MWCNTs. The resulting Pt nanoparticles
were characterized by scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy.
The Pt–MWCNT–Nafion nanocomposite film-modified glassy carbon electrode had a sharp hydrogen desorption peak at about −0.2 V
vs. Ag/AgCl (3 M) in a solution of 0.5 M H2SO4, which is directly related to the electrochemical activity of the Pt nanoparticles presented on the surface of MWCNTs. The
electrocatalytic properties of the Pt–MWCNT–Nafion nanocomposite-modified glassy carbon electrode for methanol electrooxidation
were investigated by cyclic voltammetry in a 2 M CH3OH + 1 M H2SO4 solution. In comparison with the Pt-coated glassy carbon electrode and the Pt–Nafion modified glassy carbon electrode, the
Pt–MWCNT–Nafion-modified electrode had excellent electrocatalytic activity toward methanol electrooxidation. The stability
of the Pt–MWCNT–Nafion nanocomposite-modified electrode had also been evaluated. 相似文献
5.
Du D Huang X Cai J Zhang A Ding J Chen S 《Analytical and bioanalytical chemistry》2007,387(3):1059-1065
A simple method has been devised for immobilization of acetylcholinesterase (AChE)—covalent bonding to a multiwall carbon
nanotube (MWNT)–cross-linked chitosan composite (CMC)—and a sensitive amperometric sensor for rapid detection of acetylthiocholine
(ATCl) has been based on this. Fourier-transform infrared spectroscopy proved that the native structure of the immobilized
enzyme was preserved on this chemically clean and homogeneous composite film, because of the excellent biocompatibility and
non-toxicity of chitosan. Glutaraldehyde was used as cross-linker to covalently bond the AChE, and efficiently prevented leakage
of the enzyme from the film. Because of the inherent conductive properties of the MWNT, the immobilized AChE had greater affinity
for ATCl and excellent catalytic effect in the hydrolysis of ATCl, with a value of 132 μmol L−1, forming thiocholine, which was then oxidized to produce a detectable and rapid response. Under optimum conditions the amperometric
current increased linearly with the increasing concentration of ATCl in the range 2.0–400 μmol L−1, with a detection limit of 0.10 μmol L−1. Fabrication reproducibility of the sensor was good and the stability was acceptable. The sensor is a promising new tool
for characterization of enzyme inhibitors and for pesticide analysis.
Abstract 相似文献
6.
《Electrochemistry communications》2008,10(10):1527-1529
A novel synthesis route concerning reduction of cobalt core onto the surface of multiwalled carbon nanotubes (MWCNTs) and then substitution of part of Co core with Pt–Ru precursor was developed to synthesize the core-shell Co@Pt–Ru/MWCNTs catalyst. In this synthesis route, sodium borohydride and hydrazine hydrate were employed to reduce cobalt step by step in order to control the size of cobalt and the growth speed of cobalt crystal. The novel core-shell Co@Pt–Ru/MWCNTs catalyst shows good electrocatalysis towards methanol oxidation. 相似文献
7.
Huili Ma Li Wang Zhiguang Liu 《International journal of environmental analytical chemistry》2016,96(2):161-172
In this work, ionic liquid–graphene nanosheets (IL–GNs) were synthesised and used as an enhanced material for sensitive detection of methyl parathion (MP) by electrochemical method. IL–GNs were characterised by UV–Vis spectroscopy, transmission electron microscopy (TEM), X-ray photo-electron spectroscopy (XPS), Fourier transform Infrared (FT-IR) spectroscopy and Raman spectroscopy, which confirmed that IL was successfully covered on the surface of GNs. Significantly, due to the coupling of excellent properties of GNs and IL, the IL–GNs-modified glassy carbon electrode (IL–GNs/GCE) showed higher signals for MP response than the GNs/GCE and bare GCE. At the IL–GNs/GCE, the peak currents increase linearly with the concentration of MP in the range of 5.3 ng/mL to 2.6 μg/mL with the detection limit of 1.1 ng/mL, which was better than other enzyme-based and enzymeless sensors. The IL–GNs-based electrochemical sensor was also successfully demonstrated for the detection of water sample with satisfactory results. Furthermore, the proposed electrochemical sensor exhibited satisfied stability and reproducibility. The simple sensing platform can be extended to detect other organophosphate pesticide. 相似文献
8.
In an attempt to obtain a model of copper(II) ion-selective sensors, a new 1,8-naphthalimide-based fluorescence chemosensor, N-allylamine-4-[(E)-4-(([2-aminoethyl]imino)methyl) benzene-1,3-diol]-1,8-naphthalimide (NABN), was designed and synthesized. The sensor NABN is fully characterized by melting point analysis, fourier transform infrared spectra, Ultraviolet–visible (UV–vis) spectra, fluorescence spectra, 1H NMR and 13C NMR spectroscopy, and mass spectrometry. NABN showed an unrivaled sensing behavior and an ardent selectivity toward copper(II) ion over other competitive metal ions tested in solution (N,N-Dimethylformamide (DMF)/Tris–HCl buffer, 1:1, v/v, pH = 7.2). The sensor showed a linear fluorescence quenching toward copper(II) ion in the range 0–50 μM, with a detection limit of 1.92 × 10−7 M estimated. Job's method indicated the formation of a 2:1 coordinative mode of the sensor with copper(II) ion with a high threshold of binding constant of 4 × 1012 M−1. Combining the above results, the quenching response of NABN toward Cu(II) ions could be ascribed to the strong, intrinsic paramagnetic behavior of Cu(II). 相似文献
9.
Moutab Sahihazar Milad Ahmadi Mohammad Taghi Nouri Mina Rahmani Meisam 《Journal of Solid State Electrochemistry》2019,23(6):1641-1650
Journal of Solid State Electrochemistry - Nanostructured carbon material (NSCM) based chemiresistive sensors are popular for sensing different analytes because of their high sensitivity, low cost,... 相似文献
10.
Ha Minh Hiep Masato Saito Yoshikazu Nakamura Eiichi Tamiya 《Analytical and bioanalytical chemistry》2010,396(7):2575-2581
Developments of optical protein sensors with nanostructure based on the noble metals have currently received great attention
for their high efficiency and simultaneous analysis of various important biomolecules from proteomics to genetics. In this
study, we exploited the absorbance spectra of gold-capped nanoparticles substrate for label-free detections of antigen–antibody
reactions using a specific thiolated RNA aptamer. These synthesized RNA aptamers have been optimized to bind to the Fc portion
of the human IgG1 subclass, due to their ability to orient antibodies direction on the gold surface. After attaching the anti-fibrinogen
antibodies on the surface via these linkers, our thiolated RNA aptamer-based nanostructured sensors were easily applicable
to specific detections of fibrinogen with a limit of detection of 0.1 ng/mL. These nanostructured sensor-based models will
open a way to display numerous immunosensors as well as to develop other functionally similar sensors which could then be
expanded into multi-arrays assay systems. 相似文献
11.
Mulan Qin Jun Liu Shuquan Liang Qing Zhang Xilin Li Yue Liu Meiying Lin 《Journal of Solid State Electrochemistry》2014,18(10):2841-2846
Multiwalled carbon nanotube (MWCNT)–vanadium pentoxide (V2O5) nanocomposites have been fabricated using a facile and environmental friendly hydrothermal method without any pretreatment, surfactants, or chelate agents added. The as-annealed nanocomposites are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and the results indicate that V2O5 nanoparticles grew on MWCNTs. As a cathode material for lithium batteries, it exhibits superior electrochemical performance compare to the pure V2O5 powders. A high specific discharge capacity of 253 mA h g?1 can be obtained for the 15 % MWCNT–V2O5 nanocomposite electrodes, which retains 209 mA h g?1 after 50 cycles. However, the pure V2O5 powder electrodes only possess a specific discharge capacity of 157 mA h g?1 with a capacity retention of 127 mA h g?1 after 50 cycles. Moreover, the MWCNT–V2O5 nanocomposite electrodes show an excellent rate capability with a specific discharge capacity of 180 mA h g?1 at the current rate of 4 C. The enhanced electrochemical performance of the nanocomposites is attributed to the formation of conductive networks by MWCNTs, and large surface areas of V2O5 nanoparticles grew on MWCNTs which stabilizes these nanoparticles against agglomeration. 相似文献
12.
Hao Yu Shan-Shan Wang Kai-Li Song Rui Li 《International journal of environmental analytical chemistry》2019,99(9):854-867
The platinum nanoparticles-reduced graphene oxide-multi-walled carbon nanotubes composite (PtNPs-rGO-MWCNTs) has been synthesised by one-step chemical co-reduction strategy in ethylene glycol (EG) system using sodium citrate as reducing agent. The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), as well as the electrochemical methods have been used for the characterisation of this composite. Benefiting from the large effective surface and good carrier function of rGO-MWCNTs, PtNPs in this nanocomposite have some excellent characteristics such as small particle size, good dispersion, as well as high electrocatalytic activity. Based on this, a new electrochemical sensor for hydrazine has been fabricated using dropping method. Under the optimum conditions, the linear range for the determination of hydrazine by amperometry at 0.20 V (vs. SCE) in phosphate buffer (pH 7.0) is from 2.0 × 10?7 mol L?1 to 2.3 × 10?3 mol L?1. The detection limit and sensitivity is 4.5 × 10?8 mol L?1 (S/N = 3) and 219.7 μA mM?1, respectively. This sensor has some attractive analytical features such as low detection limit, wide linear range, high sensitivity, as well as good stability. 相似文献
13.
Wenbei Zhang Jiuli Chang Jianhua Chen Fang Xu Feng Wang Kai Jiang Zhiyong Gao 《Research on Chemical Intermediates》2012,38(9):2443-2455
A novel electrochemical sensor for para-nitrophenol (p-NP) was constructed with graphene–Au composite containing 10 % Au (G–Au 10 %). In the composite, Au nanoparticles with the size of ca. 11 nm were regularly scattered on graphene sheet without aggregation, which offers dramatically higher electrocatalytic activity on the redox of K3[Fe(CN)6]/K4[Fe(CN)6] couple than sole Au nanoparticles. Compared to sole Au nanoparticles, the G–Au 10 % also exhibited dramatically improved electrocatalytic activity on the reduction of p-NP. Amperometric detection of p-NP at G–Au 10 % modified electrode displayed a wide linear range of 0.47–10.75 mM with detection limit of 0.47 μM and a high sensitivity of 52.85 μA/mM. Considering the thrifty in utilization of noble Au, the G–Au 10 % can be successfully applied as a low-cost and powerful sensing material for trace detection of p-NP. 相似文献
14.
Guangyu Zhao Li Zhang Tong Pan Kening Sun 《Journal of Solid State Electrochemistry》2013,17(6):1759-1764
NiO/multiwalled carbon nanotube (NiO/MWCNT) nanocomposites have been prepared and used for a Li–O2 battery cathode catalyst. Electrochemical measurements demonstrate that the batteries with NiO/MWCNT catalyst have a discharge capacity of 2,500 mAh g?1, a charge capacity of 2,100 mAh g?1, and a rechargeable ability performing better than Ketjenblack (KB) and MWCNTs. KB has the largest discharge capacity (2,700 mAh g?1) due to the highest surface area and pore volume but the worst charging behavior due to poor mass transport in the small-width pore (2.48 nm). MWCNTs have a much better charging performance owing to a larger pore width (8.93 nm) than carbon black. NiO/MWCNTs have the largest charge capacity because of the facilitated mass transport in the comparatively large pores (7.68 nm) and the increased catalytic ability produced by the NiO nanoparticles. These improvements are also responsible for the best cycle and rate performances of the nanocomposites among the three catalysts. 相似文献
15.
Highly sensitive detection of daunorubicin based on carbon nanotubes–drug supramolecular interaction
A highly sensitive method for electrochemical detection of daunorubicin (DNR) was proposed on the carbon nanotubes (CNT) modified electrode. The supramolecular interaction between the CNT and the anthracyclin could significantly enhance the electron transferability, which sharply increased the detection sensitivity and lowered the detection limit. Under the optimized conditions, the linear range of the DNR detection was 20–500 nM with a detection sensitivity of 5.9 nA/nM. The detection of the DNR in the serum samples was also attempted. It can be predicted that many more analogues could be monitored on such a platform with high sensitivity. 相似文献
16.
A Pt wire coated with a bentonite–carbon composite in a poly(vinyl chloride) membrane was used for detection of lead. The
sensor has a Nernstian slope of 29.42±0.50 mV per decade over a wide range of concentration, 1.0×10−7 to 1.0×10−3 mol L−1 Pb(NO3)2. The detection limit is 5.0×10−8 mol L−1 Pb(NO3)2 and the electrode is applicable in the pH range 3.0–6.7. It has a response time of approximately 10 s and can be used at
least for three months. The electrode has good selectivity relative to nineteen other metal ions. The practical analytical
utility of the electrode is demonstrated by measurement of Pb(II) in industrial waste and river water samples. 相似文献
17.
FENG Juan YANG Zujun & REN Zhenglong School of Life Science Technology University of Electronic Science Technology of China Chengdu China Correspondence should be addressed to Feng Juan 《中国科学B辑(英文版)》2006,49(2):97-102
Since their discovery by Iijima in 1991, carbon nanotubes have inspired considerable research inter-ests worldwide because of their unique structure to-gether with electric, magnetic, thermal conductivity and mechanical properties[1]. Apart from the hexag… 相似文献
18.
Lyudmyla V. Karabanova Raymond L. D. Whitby Vladimir A. Bershtein Alina V. Korobeinyk Pavel N. Yakushev Oksana M. Bondaruk Andrew W. Lloyd Sergey V. Mikhalovsky 《Colloid and polymer science》2013,291(3):573-583
Acid-oxidized multiwalled carbon nanotubes (MWCNTs) were introduced into a polyurethane (PU) matrix at low filler levels (0.01–0.25 wt%) through either van der Waals or covalent interactions, and their glass transition dynamics using dynamic mechanical analysis and laser-interferometric creep rate spectroscopy was investigated. The nanocomposites reveal substantial impact on the PU glass transition dynamics, which depends on the nanotube content and type of interfacial interactions. The pronounced dynamic heterogeneity within the glass transition covering 200 °C range and the displacement of main PU relaxation maxima from around 0 to 80–140 °C were registered. The results are treated in the framework of chemical inhomogeneity, constrained dynamics effects, and different motional cooperativities. The peculiariaties of the glass transition dynamics in the composites are reflected in their dynamic and static mechanical properties, in particular a two- to threefold increase in modulus and tensile strength for the covalent interfacial interaction of MWCNTs with PU. 相似文献
19.