SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Jin Zhang,Yanhui Niu,Shijie Li,Rongqin Luo,Chaoying Wang
In this work, we have proposed a sensitive and selective detection technique for 2-nonylphenol (2-NP) based on the differential pulse voltammetry at a molecularly imprinted film on a glassy carbon electrode (GCE). The imprinted film was immobilised on the GCE by electrodeposition of a molecularly imprinted polymer (MIP) sol–gel consisting of a multiwalled carbon nanotube (MWNT)–Nafion (NF) composite. The modification procedure was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM). The recognition between MIP sol–gel film and target molecule was observed by measuring the change in DPV response of the oxidation-reduction probe, K 3 Fe(CN) 6 on GCE. Under optimized operational conditions, a linear response was obtained covering the concentration range from 0.2 to 360 μmol L −1 with a detection limit of 0.06 μmol L −1 . The proposed sensor was applied to 2-NP determination in water and soil samples with the recoveries from 95.4 to 98.1%, showing a promising potential application in environment samples. Additionally, The imprinted sensor demonstrated higher affinity for target 2-NP than that of non-imprinted polymer (NIP) sensor.
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高影响因子
TALANTA
·
2016
·
IF 4.035
Xiaolong Ma,Xin Zhang,Xinli Guo,Qi Kang,Dazhong Shen,Guizheng Zou
Sensitive and selective determining bio-related molecule and enzyme play an important role in designing novel procedure for biological sensing and clinical diagnosis. Herein, we found that dual-stabilizers-capped CdSe quantum dots (QDs) in composite film of multi-walled carbon nanotubes (CNTs) and Nafion, displaying eye-visible monochromatic electrochemiluminescence (ECL) with fwhm of 37 nm, which offers promising ECL signal for detecting ascorbic acid (AA) as well as the activity of alkaline phosphatase (ALP) in biological samples. It was also shown that the dual-stabilizers-capped CdSe QDs can preserve their highly passivated surface states with prolonged lifetime of excited states in Nafion mixtures, and facilitate electron-transfer ability of Nafion film along with CNTs . Compared with the QDs/GCE, the ECL intensity is enhanced 1.8 times and triggering potential shifted to lower energy by 0.12 V on the CdSe-CNTs-Nafion/GCE. The ECL quenching degree increases with increasing concentration of AA in the range of 0.01–30 nM with a limit of detection (LOD) of 5 pM. The activity of ALP was determined indirectly according to the concentration of AA, generated in the hydrolysis reaction of l -ascorbic acid 2-phosphate sesquimagnesium (AA-P) in the presence of ALP as a catalyst, with an LOD of 1 μU/L. The proposed strategy is favorable for developing simple ECL sensor or device with high sensitivity, spectral resolution and less electrochemical interference.
研究领域:
分析化学
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生物医学工程
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临床诊断
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高影响因子
ANALYTICAL LETTERS
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2023
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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.
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高影响因子
Nature Communications
·
2018
·Vol. 9
·期 1
·1-7
·
IF 12.353
Ge Xiaolin,He Yubin,Liang Xian,Wu Liang,Zhu Yuan,Yang Zhengjin,Hu Min,Xu Tongwen
Synthetic polyelectrolytes, capable of fast transporting protons, represent a challenging target for membrane engineering in so many fields, for example, fuel cells, redox flow batteries, etc. Inspired by the fast advance in molecular machines, here we report a rotaxane based polymer entity assembled via host–guest interaction and prove that by exploiting the thermally triggered translational motion (although not in a controlled manner) of mechanically bonded rotaxane, exceptionally fast proton transfer can be fulfilled at an external thermal input. The relative motion of the sulfonated axle to the ring in rotaxane happens at ~60 °C in our cases and because of that a proton conductivity (indicating proton transfer rate) of 260.2 mS cm −1 , which is much higher than that in the state-of-the-art Nafion, is obtained at a relatively low ion-exchange capacity (representing the amount of proton transfer groups) of 0.73 mmol g −1 .
研究领域:
材料科学
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化学工程
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电化学
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分子机器
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PubMed
高影响因子
Nature Nanotechnology
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2022
·Vol. 17
·期 6
·613-621
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IF 40.523
Li Shimei,Huang Junlong,Cui Yin,Liu Shaohong,Chen Zirun,Huang Wen,Li Chuanfa,Liu Ruliang,Fu Ruowen,Wu Dingcai
The low cycling efficiency and uncontrolled dendrite growth resulting from an unstable and heterogeneous lithium–electrolyte interface have largely hindered the practical application of lithium metal batteries. In this study, a robust all-organic interfacial protective layer has been developed to achieve a highly efficient and dendrite-free lithium metal anode by the rational integration of porous polymer-based molecular brushes (poly(oligo(ethylene glycol) methyl ether methacrylate)-grafted, hypercrosslinked poly(4‐chloromethylstyrene) nanospheres, denoted as x PCMS- g -PEGMA) with single-ion-conductive lithiated Nafion. The porous x PCMS inner cores with rigid hypercrosslinked skeletons substantially increase mechanical robustness and provide adequate channels for rapid ionic conduction, while the flexible PEGMA and lithiated Nafion polymers enable the formation of a structurally stable artificial protective layer with uniform Li + diffusion and high Li + transference number. With such artificial solid electrolyte interphases, ultralong-term stable cycling at an ultrahigh current density of 10 mA cm −2 for over 9,100 h (>1 year) and unprecedented reversible lithium plating/stripping (over 2,800 h) at a large areal capacity (10 mAh cm −2 ) have been achieved for lithium metal anodes. Moreover, the protected anodes also show excellent cell stability when paired with high-loading cathodes (~4 mAh cm −2 ), demonstrating great prospects for the practical application of lithium metal batteries.
研究领域:
材料科学
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电化学
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储能技术
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电池技术
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PubMed
高影响因子
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