SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Fangmeng Liu,Bin Wang,Xue Yang,Xishuang Liang,Hui Suo,Peng Sun,Yanfeng Sun,Jian Ma,Jie Zheng,Yue Wang,Geyu Lu
In this paper, a novel amperometric CO sensor using Nafion and Pt/C composite electrodes was fabricated. Three kinds of carbon materials (carbon fibers, multiwall carbon nanotubes and carbon blacks) were utilized as the supports of the sensing and reference electrodes for the CO sensors. The results revealed that the effective Pt loadings on the electrodes increased in the following order: carbon fibers (CFs) > multiwall carbon nanotubes (MWCNTs) > carbon blacks (CBs), leading to the increasing of the sensitivities toward CO in same order. In other words, the sensor using Pt/CFs as the sensing electrode (SE) showed the highest sensitivity with the value of 0.077 μA/ppm and shortest response time in the range of CO concentration from 1 to 200 ppm at room temperature . Further, a reproducible and stable response against 50 ppm CO was obtained for the sensor with Pt/CFs SE materials . Moreover, a low detection limit of 0.1 ppm for CO was also examined, suggesting that the sensor can be convenient for detecting very low traces of CO.
研究领域:
材料科学
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环境监测
·
传感器技术
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2016
·Vol. 163
·期 7
·B280
·
IF 3.014
F. Shang,Y. Liu,S. Wang
A simple, economic, highly sensitive and highly selective electrochemiluminescence (ECL) sensor for the detection of tetrodotoxin (TTX) has been developed at Nafion-graphene-Ru(bpy)32+ composite modified glassy carbon electrode (GCE). Nafion can be used as a modified electrode material to achieve the one-step immobilization of graphene and Ru(bpy)32+ due to its good electrochemical stability and high ion selectivity. The modified glassy carbon electrode not only can be acted as a solid phase microextraction tool to perform the enrichment of TTX, but also can provide good stability of the ECL sensor. Under optimal conditions, the ECL intensity of the sensor increased proportionally to the logarithmic concentrations of TTX in the range of 0.5–5000 ng·mL−1 with a detection limit of 0.1 ng·mL−1. This one-step ECL sensor showed good performance in stability, reproducibility and precision.
研究领域:
分析化学
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毒理学
·
生物传感技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Wei Jia,Beibei Tang,Peiyi Wu
Nafion–boron nitride (NBN) nanocomposites with a Nafion-functionalized periphery are prepared via a convenient and ecofriendly Nafion-assisted water-phase exfoliation method. Nafion and the boron nitride nanosheet present strong interactions in the NBN nanocomposite. Then the NBN nanocomposites were blended with Nafion to prepare NBN Nafion composite proton exchange membranes (PEMs). NBN nanocomposites show good dispersibility and have a noticeable impact on the aggregation structure of the Nafion matrix. Connected long-range ionic nanochannels containing exaggerated (−SO3–)n ionic clusters are constructed during the membrane-forming process via the hydrophilic and H-bonding interactions between NBN nanocomposites and Nafion matrix. The addition of NBN nanocomposites with sulfonic groups also provides additional proton transportation spots and enhances the water uptake of the composite PEMs. The proton conductivity of the NBN Nafion composite PEMs is significantly increased under various conditions relative to that of recast Nafion. At 80 °C–95% relative humidity, the proton conductivity of 0.5 NBN Nafion is 0.33 S·cm–1, 6 times that of recast Nafion under the same conditions.
研究领域:
材料科学
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能源技术
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 43
·2303832
·
IF 19
Shuo Chen,Yongkang Lyu,Yang Sun,Qin Wei,Chuansong Chen,Lei Chen,Xinhao Zhang,Heqi Ma,Tianyu Sun,Wen Gao,Yazhe Xu,Baoyuan Man,Qingtian Meng,Cheng Yang
Graphene field-effect transistors (G-FETs) have attracted widespread attention in disease diagnosis, benefiting from these advantages of high sensitivity, label-free, easy integration, and direct detection of nucleic acids (NAs) in liquid environments. However, the problem of nonspecific signals in G-FETs is not fundamentally solved due to a lack of systematic theoretical research to support the development of effective solutions. Thus, researchers have to rely on speculative mechanisms to minimize nonspecific signals in experiments as much as possible. Herein, the nonspecific signal mechanism caused by eight types of π – π interaction paths mediated by aromatic rings is theoretically determined. Based on theoretical simulation results, the feasibility of blocking nonspecific signal paths through Nafion functionalization methods is experimentally verified. Experiments confirm that Nafion-modified G-FETs (NMG-FETs) have excellent performance in avoiding nonspecific signals compared to traditional G-FETs. Furthermore, the NMG-FET achieves ultra-sensitive detection of Down syndrome–related DNA down to 1 aM and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA down to 5 aM, and shows good specificity in base recognition. This study is expected to promote the theoretical advancement of the nonspecific signal mechanism in G-FET NA detection and offer a practical strategy for improving signal purity and accuracy.
研究领域:
生物传感器
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分子诊断
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理论模拟与实验验证
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Huili Luo,Yilu Huang,Yuhang Xiang,Ying Zhou,Jia Zhao,Lijuan Chen
Electrochemical detection has been used to measure heavy metals in food, but matrix interferences remain limited the rapid treatment-detection. This study developed a Nafion-Bi 2 O 3 coating modified graphite paper/sodium alginate gel electrode to amplify the electrical signal of Pb(II) and improve the anti-interference towards organic acids and metal ions. Although negatively charged organic acids were excluded by Nafion, interferences of exchangeable ions were amplified. In the mix drip coating, Bi 2 O 3 was chemical combined and electrostatic interacted with OH, SO 3 − and C-S in Nafion. This modification reduced diffusion resistance, enhanced surface hydrophobicity and provided additional reactive oxygen binding sites. The peak current of Pb(II) increased 56.62 % and the detection limit was lowered to 0.015 μg/L. The recoveries of Pb in matrices were 78.33 %–106.45 %. The easy field modified graphite paper electrode represents an innovation, and this study will propel the rapid detection of heavy metals based on acid-extraction.
研究领域:
分析化学
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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Hao Lu,Tanji Yin,Feng Luan,Yanhong Li,Wei Qin
Surfactants are a type of amphiphilic chemicals that comprise both hydrophilic and hydrophobic regions, and the presence of surfactants would bring a detrimental effect on the potential responses of the solid-contact ion-selective electrodes induced by their extraction from the aqueous solution into the polymeric membrane phase. Herein, an anti-surfactant solid-contact Ca 2+ -selective electrode is proposed based on tailoring the surface of the polymeric membrane with the thin-layer Nafion membrane. The extraction of surfactants into the polymeric membrane can be eliminated through using the hydrophobic group of Nafion acting as “a polymer brush”, while the Ca 2+ diffusion from the aqueous solution to the membrane phase is promoted by the hydrophilic group of Nafion based on the electrostatic interaction. The Nafion-functionalized solid-contact Ca 2+ -ISE shows an improved potential stability and an excellent potentiometric performance for detection of Ca 2+ in the presence of cationic and anionic surfactants as compared to the traditional solid-contact Ca 2+ -ISE. Moreover, the anti-surfactant solid-contact ion-selective electrode is feasible for in situ measurement of Ca 2+ at the interface between the seawater and the sediment. This work provides a general and facile strategy to eliminate the interferences of surfactants during the potentiometric measurements, and is favorable for in situ, on-site measurement with high accuracy and precision in the aquatic environment.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Parviz Sukhrobov,Sodik Numonov,Sanshuang Gao,Xamxikamar Mamat,Thomas Wagberg,Yufen Guo,Liwei Liu,Guangzhi Hu
This study describes a type of novel nickel nanoparticles (NiNPs) decorated on Nafion-graphene composite film by using the electrochemical deposition method. It was used to fabricate electrochemical biosensors for sensitive nonenzymatic glucose detection. Compared with the Nafion–graphene film and NiNPs-modified glassy carbon electrode (NiNPs-GCE), the NiNPs/Nafion/graphene/GCE showed the best electrocatalytic activity towards glucose oxidation in alkaline medium. The NiNPs/Nafion/graphene/GCE at an applied potential of + 0.55 V in a linear range of 1–200 μ M presented a high sensitivity of 3437.25 μ A ⋅ mM − 1 cm − 2 with coefficient of correlation R 2 = 0 . 9 9 9 ; and in a linear range of 200–10 800 μ M it performed the best sensitivity of 2848.6 μ A ⋅ mM − 1 cm − 2 with coefficient of correlation R 2 = 0 . 9 9 5 towards glucose oxidation. For a concentration up to 200 μ M, a linear range was obtained with a limit of detection of 0.6 μ M (signal to noise = 3) and as much as 10 800 μ M with a limit of detection of 0.82 μ M (signal to noise = 3). The time of responses was about 1–1.5 s with the addition of 0.1–1 mM glucose. In addition, NiNPs/Nafion/graphene/GCE also has a high anti-interference ability toward common oxidative interfering species, such as uric acid, ascorbic acid and dopamine. More importantly, NiNPs/Nafion/graphene/GCE was successfully used for the determination of glucose concentration in human serum samples in comparison with a local hospital. The NiNPs/Nafion/graphene/GCE exhibited high sensitivity, low working potential, good stability, excellent electrical properties, enhanced selectivity and fast amperometric responses to glucose oxidation. Thus, as a nonenzymatic sensor, it is promising for future glucose determination development.
研究领域:
分析化学
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生物传感器
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材料科学
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电化学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanju Wu,Jianyao Kou,Lijie Wang,Long Cheng,Kui Lu
In this work, Langmuir-Blodgett (LB) technique was proposed to fabricate the homogeneous and controlled films of Nafion-nitrogen doped carbon nanotubes (Nafion-NCNTs). Microstructure and electrochemical performance of LB films of Nafion-NCNTs was characterized by atomic force microscopy (AFM) images, scanning electron microscopy (SEM) images and electrochemical experiments. Moreover, the LB film of Nafion-NCNTs was transferred to the surface of glassy carbon (GC) electrode to fabricate the electrochemical sensor to apply for determination of caffeine. Electrochemical experiments show that the LB films of Nafion-NCNTs modified GC electrode can effectively increase electrochemical response of caffeine. Under the optimum conditions, the oxidation peak current of caffeine was proportional to its concentration in the range of 8.0 × 10 -8 ~ 4.0 x 10 -6 mol L -1 , with a detection limit of 2.0 × 10 -8 mol L -1 . And the modified GC electrode showed excellent selectivity, good stability and repeatability. It also was successfully used for determination of the content of caffeine in tea samples.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 5
·2127-2138
·
IF 2.817
Dai Jicui,Ding Tianlin,Dong Yichao,Teng Xiangguo
Nafion is currently the most stable ion exchange membrane for vanadium redox flow battery (VRB). In order to decrease the high vanadium permeability of Nafion while still keeping its high ionic conductivity and stability, in this study, solution atom transfer radical polymerization (ATRP) method is used with Nafion as initiator to prepare amphoteric Nafion membrane with tunable cationic and anionic ratios. Polymers of [2-(methacryloyloxy)ethyl] trimethylammonium chloride (METAC) and sodium 4-styrenesulfonate (NaSS) are chosen as cationic and anionic monomers, respectively. FT-IR (Fourier transform infrared) and 1 H NMR (nuclear magnetic resonance) tests prove that the METAC and NaSS have been successfully bonded on the Nafion molecules. The solution-casted amphoteric Nafion membrane M-1:1 has shown the highest ion selectivity among all the grafted Nafion membranes. The VRB with M-1:1 membrane has shown the highest average energy efficiency of 83.9% at current density of 40–80 mA cm −2 , which is 4.2% higher than that of Nafion 212 (79.7%). One hundred cycles dynamic charge-discharge test proves that the M-1:1 membrane possesses enough stability and good discharge capacity retention ability. On-line self-discharge test further proves that the M-1:1 membrane has lower vanadium ions permeation than that of Nafion 212 membrane. All the results prove that ATRP is an effective method for preparation of novel amphoteric materials for VRB application.
研究领域:
材料科学
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电化学
·
能源存储技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 36
·18546-18556
·
IF 7.443
Kai Feng,Beibei Tang,Peiyi Wu
For a proton exchange membrane (PEM), the ratio of its proton conductivity to its fuel permeability usually defines the membrane selectivity. Generally, a highly selective PEM is preferred for application in direct methanol fuel cells. Herein, sulfonated SiO2@polystyrene core–shell (SiO2@sPS) nanoparticles were synthesized and then imbedded into a Nafion membrane by a blending–casting method. SiO2@sPS partakes in strong interactions with the Nafion polymer, which benefits its dispersion in the membrane matrix. The as-prepared SiO2@sPS + Nafion composite PEM presents a large increase in its proton conductivity owing to the introduction of additional –SO3H groups and hence has optimized channels for proton transport. Meanwhile, a reduced methanol crossover was also observed for the SiO2@sPS + Nafion composite PEM because of the formation of obstructed transport channels for bulk methanol. Besides this, a deep investigation on further enhancement of the membrane’s performance was conducted by etching the SiO2 core and hence forming well-dispersed uniform hollow spheres inside the membrane matrix. The intact hollow sulfonated PS spheres (h-sPS) acted as water reservoirs which in turn could gradually release water to hydrate the membrane under high-temperature and low-humidity conditions. Therefore, compared to the SiO2@sPS + Nafion membrane, the h-sPS + Nafion one presented a further increased proton conductivity at 100 °C under 40% RH. Meanwhile, h-sPS further suppressed methanol penetration by trapping it inside the hollow spheres. Herein, a “H2O donating/methanol accepting” mechanism was proposed for the first time, providing a promising platform to alleviate critical disadvantages of Nafion membranes and thereby fabricate highly selective Nafion-based PEMs.
研究领域:
材料科学
·
化学工程
·
能源技术
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产品关联
DOI
高影响因子
ELECTROCHEMISTRY
·
2025
·
IF 1.7
Jin LI,Siyuan HAN,Yue CUI,Tong XING,Tingting ZHENG,Jing YANG,Yu FU,Jie LIAN,Fangyuan ZHAO,Weining ZHAO
Piroxicam is a common painkiller and anti-inflammatory drug. Precise monitoring of piroxicam levels can mitigate side effects, but current methods are often slow and complicated. An easily fabricated and highly sensitive voltammetric sensor for piroxicam was developed by drop-coating a composite of multi-walled carbon nanotubes (MWCNTs) and Nafion onto the electrode surface. The morphological and electrochemical characteristics of the Nafion-MWCNTs composite film were analyzed to reveal the synergistic effects of Nafion and MWCNTs. The composite film was then applied to modify a glassy carbon electrode (GCE), which served as a voltammetric sensor for the detection of piroxicam. When compared to previous reports, the sensor demonstrated efficient electrochemical oxidation of piroxicam with remarkable sensitivity, reproducibility, and stability. Under optimized conditions, the Nafion/MWCNTs/GCE exhibited a linear voltammetric response for piroxicam in the concentration range of 5 × 10−9 to 8 × 10−6 mol L−1 and 8 × 10−6 to 6 × 10−5 mol L−1 respectively, with a detection limit of 4 × 10−9 mol L−1. The sensor was successfully applied to detect piroxicam in real tablet samples, providing satisfactory recovery values. Furthermore, the composite film was applied to the surface of a platinum microelectrode, resulting in a micro-sensor for piroxicam detection. With the typical small size and the radial diffusion field, the micro-sensor of piroxicam exhibited increased sensitivity and possessed unique properties. Particularly, fast and accurate response across various piroxicam concentrations was achieved without the necessity of additional forced-convection for preconcentration, demonstrating its great potential for in vivo determination of piroxicam.
研究领域:
药物分析
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电化学传感
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生物医学工程
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药理学
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药物代谢
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即时检测
·
纳米生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2010
·Vol. 171
·期 3
·385-392
·
IF 2.648
Yin Huanshun,Zhou Yunlei,Liu Tao,Cui Lin,Ai Shiyun,Qiu Yanyan,Zhu Lusheng
An amperometric biosensor for nitrite was prepared by immobilizing cytochrome c (Cyt c) on a gold electrode that was modified with Nafion and a Cu-Mg-Al layered double hydroxide (Cu-LDH). The Cu-LDH was characterized by Fourier transform infrared spectroscopy and powder X-ray diffraction. The UV-visible spectrum suggests that Cyt c retains its native conformation in the modified film. The direct electrochemical investigation indicated that the composite film represents a good platform for the immobilization of Cyt c as well as an excellent promoter for the electron transfer between Cyt c and the gold electrode. Moreover, the biosensor showed a remarkable bioelectrocatalytic activity for the oxidation of nitrite with a linear range from 0.75 to 123 μM. The detection limit is 2 × 10 −7 M (S/ N = 3). The biosensor was successfully applied to the determination of nitrite in food samples.
研究领域:
生物分析化学
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电化学传感
·
食品分析
·
生物传感器
·
分子诊断
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）