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Highly Sensitive and Selective amperometric sensor for Iodate Based on 9,10-Phenanthrenequinone Derived Graphene

Chemical Research in Chinese Universities 2013年第1期29卷 132-138页

作者： WANG Hong-juan CHENG Na-na YANG Xiao-yang LI Xiao-meng ZHU Lian-de Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

We reported on a new amperometric sensor for the sensitive and selective determination of iodate in table salt. The iodate sensor was constructed by the integration of a novel nanocomposite which was made from 9,10-phenanthrenequinone（PQ） and graphene（GP） with a glassy carbon electrode（GCE）. The synthesized graphene and the nanocomposite were well characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, Fourier transform infrared（FTIR） spectroscopy and Raman spectroscopy. We fully studied the electrochemical beha- vior and kinetic characteristics of the PQ/GP nanocomposite at GCE. The PQ/GP electrode shows a good electrochemical catalytic activity towards the reduction of iodate, which makes itself a sensitive and selective electrochemical sensor for iodate. The iodate sensor displays a high sensitivity（1.04 ***.L-1）, a low detection limit（1.0X 10-8 mol/L）, a rapid response（less than 2 s）, and a broad linear range（from 5.0X 10-8 mol/L to 6.0X 10-3 mol/L ）. In addition, the sensor is interference free. The practical application of the proposed sensor was tested by the detection of iodate in table salt.

关键词： 9,10-Phenanthrenequinone Graphene amperometric sensor Iodate

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An Enzyme-Free amperometric sensor Based on Self-Assembling Ferrocene-Conjugated Oligopeptide for Specific Determination of L-Arginine

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Chinese Journal of Chemistry 2021年第10期39卷 2755-2762页

作者： Kai-Jie Zhu Li Zhou Ling Wu Sai-Fei Feng Hui-Ying Hu Jing-Lin He Yu-Min He Ze-Meng Feng Yu-Long Yin Donghong Yu Zhong Cao Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation and Hunan Provincial Key Laboratory of CytochemistrySchool of Chemistry and Biological EngineeringChangsha University of Science and TechnologyChangshaHunan410114 China Institute of Subtropical Agriculture Chinese Academy of SciencesChangshaHunan 410125China Department of Chemistry and Bioscience Aalborg UniversityDK-9220 AalborgEastDenmark

Main observation and conclusion An enzyme-free amperometric sensor based on a heptadecapeptide possessing an electroactive ferrocene(Fc)linker as ferrocene-Gly-Gly-Gly-Gly-Phe-Gly-His-Ile-His-Glu-Gly-Tyr-Gly-Gly-Gly-Gly-Lys-(CH_(2))_(4)-dithiocyclopentane self-assembled on gold substrate was designed and fabricated for specific determination of L-arginine(L-Arg).The detection mechanism is based on conformational change of surface-immobilized peptide induced by the target L-Arg,which was confirmed via SEM,TEM,AFM,XPS,and SPR *** binding affinity and the recognition feasibility of immobilized specific and non-specific peptides were also assessed using electrochemical impedance spectroscopy(EIS),cyclic voltammetry(CV),and differential pulse voltammetry(DPV).The proposed method can serve as“signal-on”sensor for detection of L-Arg down to 31 pmol/L with broad linear range(0.0001 to 10μmol/L).Furthermore,the Fc-conjugated specific peptide sensor was successfully applied to the determination of L-Arg in pig serums with a recovery rate of 97.5%—106.9%,and its test results are in good agreement with that of chromatographic instrument,evidencing that the oligopeptide-based sensor can be served as a simple and enzyme-free biosensing platform towards L-Arg for future application.

关键词： L-Arginine Peptides Surface Analysis Enzyme-Free amperometric sensor

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A Novel amperometric Nitric Oxide sensor Based on Polythionine/Nation Modified Glassy Carbon Electrode

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Chinese Chemical Letters 2006年第4期17卷 496-498页

作者： Xiao Xia CHEN Fang WANG Yan Xia XU Sheng Shui HU Depatment of Chemistry Wuhan University Wuhan 430072 State Key Laboratory of Transducer Technology Chinese Academy of Sciences Beijing 100084

A novel amperometric sensor for the determination of nitric oxide was developed by coating polythionine / nation on a glassy carbon electrode. This sensor exhibited a great enhancement to the oxidation of nitric oxide. The oxidation peak currents were linear to the concentration of nitric oxide over the wide range from 3.6×10^-7 to 6.8×10^-5 mol·L^-1, and the detection limit was 7.2×10^-8 mol·L^-1. Experimental results showed that this nitric oxide sensor possessed excellent selectivity and longer stability. NO releasing from rat kidney was monitored by this sensor.

关键词： amperometric sensor nitric oxide thionine electrochemistry.

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A high precision CMOS weak current readout circuit

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Journal of Semiconductors 2009年第7期30卷 131-136页

作者：吴其松杨海钢尹韬张翀 Institute of Electronics Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences

This paper presents a high precision CMOS weak current readout *** circuit is capable of converting a weak current into a frequency signal for amperometric measurements with high precision and further delivering a 10-bit digital output.A fast stabilization-enhanced potentiostat has been proposed in the design, which is used to maintain a constant bias potential for amperometric biochemical sensors.A technique based on source voltage shifting that reduces the leakage current of the MOS transistor to the reverse diode leakage level at room temperature was employed in the *** chip was fabricated in the 0.35 μm chartered CMOS process, with a single 3.3 V power *** interface circuit maintains a dynamic range of more than 100 *** from 1 pA to 300 nA can be detected with a maximum nonlinearity of 0.3% over the full scale.

关键词： amperometric sensor current readout high precision potentiostat

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Fabrication of nanocomposite electrochemical sensors with poly(3,4-ethylenedioxythiophene)conductive polymer and Au nanoparticles adsorbed on carboxylated nanocrystalline cellulose

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Journal of Bioresources and Bioproducts 2018年第1期3卷 30-34页

作者： Jinshi Fan Shaoping Liang Mingming Zhang Guiyun Xu College of Marine Science and Biological Engineering Qingdao University of Science and TechnologyQingdao 266042China Key Laboratory of sensor Analysis of Tumor Marker Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China

Au nanoparticles(AuNPs)were prepared by reducing HAuCl4 with NaBH4,and then adsorbed uniformly on the surface of carboxylated nanocrystalline cellulose(CNCC).The obtained AuNPs/CNCC particles were doped into a conductive polymer of poly(3,4-ethylenedioxythiophene)(PEDOT)to yield a highly conductive nanocomposite,which was deposited onto a glassy carbon electrode(GCE)by an electrochemical *** PEDOT/AuNPs/CNCC nanocomposite showed low electrochemical impedance and good electrocatalytic activity toward ascorbic *** on this novel nanocomposite material,an amperometric sensor was developed for the detection of ascorbic acid with a detection limit as low as 0.29μ*** operated at-0.15 V,the sensor detected ascorbic acid in the range of 0.88μM to 15000μM.

关键词： Carboxylated nanocrystalline cellulose Au nanoparticles Poly(3,4-ethylenedioxythiophene) Electrochemical impedance spectroscopy amperometric sensor Ascorbic acid

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