MICROCHIMICA ACTA
·
2011
·Vol. 173
·期 1
·241-247
·
IF 2.578
Fan Yang,Liu Jin-Hang,Lu Hai-Ting,Zhang Qin
We describe a glassy carbon electrode (GCE) modified with a film composed of Nafion and TiO 2 -graphene (TiO 2 -GR) nanocomposite, and its voltammetric response to the amino acids L-tryptophane (Trp) and L-tyrosine (Tyr). The incorporation of TiO 2 nanoparticles with graphene significantly improves the electrocatalytic activity and voltammetric response compared to electrodes modified with Nafion/graphene only. The Nafion/TiO 2 -GR modified electrode was used to determine Trp and Tyr with detection limits of 0.7 and 2.3 μM, and a sensitivity of 75.9 and 22.8 μA mM −1 for Trp and Tyr, respectively.
The electrochemical sensor based on Nafion/TiO 2 -GR composite film modified GCE was presented. The integration of TiO 2 nanoparticles with graphene provides an efficient microenvironment to promote the electrochemical reaction of amino acids Trp and Tyr. The fabricated electrochemical sensor exhibits favorable analytical performance for Trp and Tyr, with high sensitivity, low detection limit and good reproducibility.
研究领域:
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Yue Yuan,Jianfei Xia,Feifei Zhang,Zonghua Wang,Qingyun Liu
A novel Nafion/polyaniline/Zeolitic Imidazolate Framework-8 nanocomposite (Nafion/PANI/ZIF-8) has been fabricated on the surface of glassy carbon electrode (GCE) for the electrochemical determination of dopamine (DA). In this sensor, ZIF-8 provides large surface area and excellent electrocatalytic activity while PANI exhibits great electric conductivity. Surface morphology and structure of the modified electrode were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The eletrocatalytic properties of the modified electrode were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The Nafion/PANI/ZIF-8 modified electrode displayed a high catalytic performance towards DA oxidation in PBS, which can be attributed to the synergistic effects of PANI and ZIF-8. Under the optimized conditions, the linear range was from 1.0 × 10 −7 to 1.0 × 10 −4 mol L −1 and the limit of detection was 1.2 × 10 −8 mol L −1 . In addition, the developed sensor showed great selectivity, high reproducibility, excellent stability and applicability in real samples analysis.
研究领域:
电化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 18
·2000342
·
IF 4.948
Fei Jin,Ke Yan,Ying Zhao,Lijuan Du,Rui Li,Jie Zheng,Ting Wang,Zhang-Qi Feng
Construction of long-range interconnected ionic channels in proton exchange membranes (PEMs) is the key to realize anisotropic proton transportation. But, how to effectively modulate ionic channels at the molecular level still remains a great challenge for modern nanoenergy technology. Here, surface enriched sulfonic acid ionic clusters in Nafion (NF)/ZnO nanofibers are successfully designed and fabricated as long-range interconnected ionic channels, in which the ZnO nanofiller (nano-ZnO) act as an inducer to enable the spatial deformation and inversion of sulfonic acid groups in NF molecule from the inside to the surface of the NF/ZnO nanofibers, due to the strong intermolecular electrostatic interactions between nano-ZnO and the CF 2 of NF backbones. The phenomenon and molecular mechanism are visually confirmed by physicochemical analysis. Ultimately, the NF/ZnO nanofibers demonstrate the relative higher of proton conductivity up to 253.2 mS cm -1 and power density of 115.72 mW cm -2 than that of reported NF-based PEMs. This study, for the first time, reveals that the surface enrichment of sulfonic acid ionic clusters is an efficient strategy to construct long-range interconnected ionic channels in the NF-based PEMs, proves that the formation of the ionic channels could be efficiently modulated by controlling the molecular activity and morphology of nanofiller.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Jian Huang,Guolin Yuan,Dongliang Cheng,Fei Xie,Xianru Xia,Xiandong Li,He An,Chunyan Peng
Atherosclerotic coronary heart disease (CHD) is ischemic and a worldwide health issue. The soluble suppression of tumorigenicity 2 (sST2) is a novel biomarker for atherosclerotic coronary heart disease. This work develops an immunosensor with a nanocomposite consisting of polyaniline (PANI) and MXene-Nafion for the specific and sensitive determination of sST2. PANI was first electropolymerized on a glassy carbon electrode (GCE) to enhance electron transfer. Subsequently, MXene-Nafion dispersion was drop cast on the PANI/GCE substrate to further increase the electrical conductivity and immobilize anti-sST2 which captures sST2 for detection. The current response as a function of sST2 concentration was measured by differential pulse voltammetry (DPV). Under the optimal conditions, this immunosensor demonstrates a linear range from 1 pg mL−1 to 1 μg mL−1 and a detection limit of 0.149 pg mL−1. The device offers high sensitivity, excellent specificity, satisfactory reproducibility, good stability, and has significant potential for detecting clinical biomarkers. In addition, the immunosensor is able differentiate between serum of healthy people and CHD patients.
研究领域:
医学诊断
·
生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 23
·e2320012121
·
IF 9.4
Xin He,Youxuan Ni,Wenjiao Ma,Qiu Zhang,Zhenkun Hao,Yunpeng Hou,Haixia Li,Zhenhua Yan,Kai Zhang,Jun Chen
Rechargeable sodium-oxygen (Na–O2) battery is deemed as a promising high-energy storage device due to the abundant sodium resources and high theoretical energy density (1,108 Wh kg–1). A series of quasisolid electrolytes are constantly being designed to restrain the dendrites growth, the volatile and leaking risks of liquid electrolytes due to the open system of Na–O2 batteries. However, the ticklish problem about low operating current density for quasisolid electrolytes still hasn’t been conquered. Herein, we report a rechargeable Na–O2 battery with polyvinylidene fluoride-hexafluoropropylene recombination Nafion (PVDF–HFP@Nafion) based quasisolid polymer electrolyte (QPE) and MXene-based Na anode with gradient sodiophilic structure (M-GSS/Na). QPE displays good flame resistance, locking liquid and hydrophobic properties. The introduction of Nafion can lead to a high Na+ migration number (tNa+ = 0.68) by blocking the motion of anion and promote the formation of NaF-rich solid electrolyte interphase, resulting in excellent cycling stability at relatively high current density under quasisolid environment. In the meantime, the M-GSS/Na anode exhibits excellent dendrite inhibition ability and cycling stability. Therefore, with the synergistic effect of QPE and M-GSS/Na, constructed Na–O2 batteries run more stably and exhibit a low potential gap (0.166 V) after an initial 80 cycles at 1,000 mA g–1 and 1,000 mAh g–1. This work provides the reference basis for building quasisolid state Na–O2 batteries with long-term cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Results in Chemistry
·
2025
·
IF 4.2
Jiao Yu,Yang Zhang,Bochang Zhang,Yuhan Yang,Yuanyue Lu,Lin Liu,Yong Mei,Yingying Gu
The accumulation of lead (Pb 2+ ) and cadmium (Cd 2+ ) in the human body can lead to significant long-term health risks. Urine is an essential biological sample that reflects the accumulation of metals in the body, and an invaluable source of monitoring information. Consequently, it is crucial to develop methods that enable the highly sensitive and selective detection of Pb 2+ and Cd 2+ concentrations in urine. In this study, a composite material of carboxylated multi-walled carbon nanotubes (CMWCNTs) and Nafion was synthesised and used to fabricate a modified glassy carbon electrode (GCE) via drop-casting, followed by the potentiostatic deposition of an antimony (Sb) film. Differential pulse stripping voltammetry (DPSV) was used for the quantitative analysis of Pb 2+ and Cd 2+ in urine, with experimental conditions carefully optimised. The results showed a strong linear relationship between the peak current and the concentration of Pb 2+ /Cd 2+ within a 2–100 μg·L −1 range. The detection limits for Pb 2+ and Cd 2+ were 0.46 and 0.38 μg·L −1 , respectively. When applied to actual urine samples, the modified electrode demonstrated excellent performance, achieving spiked recovery rates of 96.53–103.35 % for Pb 2+ and 93.87–96.59 % for Cd 2+ . These findings indicated that the proposed method effectively detected trace amounts of Pb 2+ and Cd 2+ in urine, offering a promising tool to monitor Pb 2+ and Cd 2+ in biological specimens.
研究领域:
分析化学
·
环境毒理学
·
电化学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Lili Xiao,Hongbo Xu,Shenghai Zhou,Ting Song,Huanhuan Wang,Shouzhu Li,Wei Gan,Qunhui Yuan
Recently, metal-organic frameworks (MOFs) and their carbon derivates have been demonstrated as new electrode modifying materials for electrochemical sensing. In this work, the first example of the detection of heavy metal ions with a MOF-derived sensing platform was presented. The platform was based on a glassy carbon electrode (GCE) modified by Nafion-bismuth/nitrogen doped microporous carbon (NMC) composite, in which the NMC was derived from a zeolitic imidazolate framework-8 (ZIF-8). The good dispersibility, large specific surface area (941 m 2 g −1 ), high nitrogen content (25.0 at.%) and good electrical conductivity of the NMC materials, as well as the synergistic effects of Nafion and bismuth-film contributed to the enhanced signals of the electrode during the differential pulse anodic stripping voltammetry (DPASV) measurements for simultaneous detection of trace Cd(II) and Pb(II) in aqueous solution. The calibration curves for Cd(II) covered two linear ranges varying from 2 to 10 μg L −1 and 10 to 100 μg L −1 . As for Pb(II), the linear calibration curves ranged from 0.5 to 10 μg L −1 and 10 to 100 μg L −1 . The detection limits were estimated to be 1.5 μg L −1 (S/N = 3) for Cd(II) and 0.05 μg L −1 (S/N = 3) for Pb(II), which were 2 times and 200 times lower than the guideline values of drinking water given by the World Health Organization (WHO), for Cd(II) and Pb(II), respectively. In addition, the good reproducibility and stability of the modified electrode offered a promising perspective for the detection of trace metal ions in practice. Compared with other porous carbon modified electrodes that obtained by either drop-casting or screen-printing method, the proposed Nafion/Bi/NMC/GCE showed a much lower detection limit for Pb(II) and a lower or comparable detection limit for Cd(II). Moreover, the obtaining of uniformly ordered N-doped carbon polyhedron could shed light on the preparation of other heteroatom-doped electrode modifying materials for the detection of heavy metal ions .
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yujiao Hou,Nan Long,Qingbin Xu,Ying Li,Pengyue Song,Minghan Yang,Jiabo Wang,Lidong Zhou,Ping Sheng,Weijun Kong
Trace detection of ochratoxin A (OTA) in foods is essential to mitigate risks to human health. Herein, a label-free electrochemical (EC) aptasensor based on dual-signal amplification of Nafion dispersed multi-walled carbon nanotubes (Nafion-MWCNTs) and Au nanopopcorns was developed for ultrasensitive detection of OTA. Nafion solution prevented the leaching of MWCNTs, and the Nafion-MWCNTs modified screen-printed carbon electrode (SPCE) acted as the sensing substrate which facilitated the uniform distribution of the electrodeposited Au nanopopcorns. The in-situ generated Au nanopopcorns could not only load a large amount of aptamers for specific identification of OTA, but also promote the electron transfer of the sensing platform. The incorporation of Nafion-MWCNTs and Au nanopopcorns realized dual-amplification of the aptasensor due to the enhanced conductivity and the increased electroactive surface area of the electrode. The modified electrodes were characterized through scanning electron microscopy, X-ray photoelectron spectroscopy and EC evaluation. Under optimal conditions, the electrochemical impedance spectroscopy (EIS) was measured for the determination of OTA. The as-fabricated Au nanopopcorns/Nafion-MWCNTs impedimetric aptasensor displayed excellent sensitivity with a detection limit as low as 1 pg/mL and a wide linear range of 1 pg/mL-10 ng/mL for OTA. Practical application of the aptasensor in the spiked malt samples achieved satisfactory recoveries of 89.82–95.65 %, which was also successfully verified to detect OTA in eleven batches of actual malt samples collected from the local market. The creative aptasensor is simple, cost-effective, sensitive, and accurate, showing great promise for on-site monitoring of other trace contaminants in foods by simply replacing the aptamers.
研究领域:
分析化学
·
食品科学
·
纳米技术
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Gangfeng Li,Shaobiao Feng,Lili Yan,Lijuan Yang,Bei Huo,Liuliu Wang,Sheng Luo,Dexin Yang
Due to a small amount of Cu (Ⅱ) ions being beneficial and too much being harmful, it is necessary to establish a rapid and direct detection method. Herein, we reported a platform based on multiwalled carbon nanotubes (MWCNTs), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), and Nafion solution-modified glassy carbon electrode (GCE) for the direct electrochemical detection of Cu (II) ions. We used differential pulse anodic stripping voltammetry, including the electrodeposition of Cu (Ⅱ) ions on the modified GCE and subsequent anodic stripping. Under the optimum conditions, the linear range was 20 μg·L −1 ∼ 950 μg·L −1 , the limit of detection (LOD) was 16 μg·L −1 , and the limit of quantification (LOQ) was 54 μg·L −1 for Cu (II). We realized the quantitative detection of Cu (Ⅱ) ions in juice and tea beverage without tedious pretreatment. The result showed that the sensor had good anti-interference and practicability for actual food samples.
研究领域:
分析化学
·
电化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 26
·期 2
·801-811
·
IF 2.289
Dai Jicui,Zhang Hongqiang,Sui Zhaobin,Hu Huili,Gao Peng,Zhu Yongming,Dong Yichao,Teng Xiangguo
In order to reduce the vanadium ion permeability while still keep its high stability, atom radical polymerization (ATRP) method was used to introduce zwitterionic sulfobetaine methacrylate (SBMA) onto the Nafion matrix in homogenous solution. The Nafion-grafted poly SBMA (N-g-PSBMA) solution was then used to blend with common Nafion solution to prepare Nafion/Nafion-g-PSBMA (N/N-g-PSBMA) amphoteric membranes by solution casting method. The grafted resins and membranes were characterized by attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR), energy dispersive X-Ray spectroscopy (EDX), scanning electron microscopy (SEM), and water-contact angle analysis. The results prove that the SBMA has been successfully grafted onto the Nafion backbones. Furthermore, the N/N-g-PSBMA membranes have shown higher ion selectivity, coulombic efficiency, and energy efficiency than that of pure recast Nafion (r-Nafion) membrane for VRB application. At the current density of 40–80 mA cm −2 , the average energy efficiency of the VRB with N/N-g-PSBMA-20% membrane has reached up to 84.9%, which is 4.2% higher than that of the VRB with the r-Nafion membrane at the same current densities. Moreover, the 100-cycles charge-discharge test proves that the N/N-g-PSBMA-20% membrane possesses higher stability and capacity retention ability than that of r-Nafion membrane, confirming the great potential of such membranes for VRB application.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mingchao Cao,Shiteng Liu,Shusheng Liu,Zhaogang Tong,Xijun Wang,Xinhua Xu
In this study, monolayer titanium carbide (Ti 3 C 2 T x ) material was prepared, then the modified ZnO and Ti 3 C 2 T x were self-assembled to obtain the MXene based composite material. Finally, ZnO/Ti 3 C 2 T x /Nafion/Au electrodes were prepared to construct a dopamine electrochemical sensor for detection of dopamine. SEM, XRD measurements and so on verified the synthesis of monolayer Ti 3 C 2 T x and preparation of the MXene based composite material. Utilizing Chronoamperometry (I-t), we found the electrodes displayed a linear dynamic range from 0.1 to 1200 μM with a limit of detection of 0.076 μM (S/N = 3). Meanwhile, the sensitivity of the sensor is 96nA/μM and in the prepared biological samples, the recoveries of the sensor were 97.8%∼102.2%. Finally, the electrochemical sensor showed a good reproducibility and stability.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Jicui Dai,Yichao Dong,Cong Yu,Yaxin Liu,Xiangguo Teng
A novel N115-g-PSBMA membrane containing zwitterionic groups was successfully prepared by grafting the zwitterionic SBMA (sulfobetaine methacrylate) onto Nafion 115 (N115) via SI-ATRP (surface-initiated atom transfer radical polymerization) technique. The N115-g-PSBMA membrane has shown higher hydrophilicity , lower vanadium permeability, higher coulombic efficiency and energy efficiency than that of commercial N115 membrane for VRB (vanadium redox flow battery) application. At the current density of 40–80 mA cm −2 , the average energy efficiency of the VRB with N115-g-PSBMA membrane has reached up to 87.3%, which is 2.6% higher than that of the VRB with N115 membrane at the same current densities. The method is expected to present a new direction to prepare novel separators with both excellent performances and low cost for VRB application.
研究领域:
能源材料
·
高分子科学
·
电化学储能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）