Enhanced electrocatalytic nitrite determination using poly(diallyldimethylammonium chloride)-coated Fe1.833(OH)0.5O2.5-decorated N-doped graphene ternary hierarchical nanocomposite - ScienceDirect
Export JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page., May 2017, Pages 184-194Author links open overlay panelShow moreHighlightsoFe1.833(OH)0.5O2.5/N-doped graphene@PDDA hierarchical composite was synthesized.oThe ternary composite can be constructed by a facile one-pot hydrothermal method.oThe fabricated sensor exhibits the excellent analytical performance for nitrite.oThe synergistic effect can significantly enhance the electrochemical response.oThe nitrite sensor shows an excellent reproductivity and anti-interference ability.AbstractTo develop simple and sensitive electrocatalytic technique for toxic nitrite determination is significantly important. Electrochemical nitrite sensor has attracted tremendous attention owing to its high sensitivity, selectivity and short response time. Here, we report the highly sensitive nitrite sensor based on poly(diallyldimethylammonium chloride) (PDDA)-coated Fe1.833(OH)0.5O2.5-decorated N-doped graphene (NG) ternary hierarchical nanocomposite (Fe1.833(OH)0.5O2.5/NG@PDDA). Differing from complicated synthetic routes for the reported ternary systems, the Fe1.833(OH)0.5O2.5/NG@PDDA composite can be effectively constructed by a facile one-pot hydrothermal method. The electrochemical performance of Fe1.833(OH)0.5O2.5/NG@PDDA composite film modified glassy carbon electrode was investigated by cyclic voltammetry and amperometric techniques. The experimental results indicate that synergistic effect of Fe1.833(OH)0.5O2.5 as catalytic center, NG as conductive platform and PDDA as nitrite adsorbent can significantly enhance the electrochemical response. The fabricated sensor exhibits the excellent analytical performance for nitrite detection linearly over two different concentration ranges, which are from 0.1 to 347 μM and from 347 to 1275 μM with a detection limit of 0.027 μM (S/N = 3). The value is very much comparable to the recent literature ones. Moreover, the proposed electrochemical sensor also shows good stability, reproductivity and excellent anti-interference ability against metal ions and electroactive species, and exhibits satisfactory recovery for detecting nitrite in drinking water.Graphical abstractKeywordsNitriteGrapheneFe1.833(OH)0.5O2.5Poly(diallyldimethylammonium chloride)Electrochemical sensorsCheck if you have access through your login credentials or your institution.ororRecommended articlesCiting articles (0)VitaeMaoxiang Liu is now pursuing a Master Degree under the supervision of Associate Prof. Shupeng Zhang at Nanjing University of Science and Technology. He received his B.S. degree from the same university (2014). Recently, the main field of his research is the application of multicomponent nanocomposites in electrochemical sensors.Shupeng Zhang obtained his Doctor Degree from Sichuan University in 2009. As a visiting scholar, he joined Prof. Jianyong Ouyang’s group at National University of Singapore, Prof. Aimin Li’s group at Nanjing University in 2014 and 2016, respectively. Now he is an Associate Professor in School of Chemical Engineering, Nanjing University of Science and Technology. His current research interests are electrochemical determination and removal of pollutant utilizing carbon-based nanomaterials.Juanjuan Gao is currently studying for a Ph.D. degree at Nanjing University of Science and Technology. Her scientific interests focus on carbon-based hybrid nanomaterials for electrochemical applications.Yueyue Qian is a postgraduate student in Nanjing University of Science and Technology. She received his B.S. degree from the same university. Recently, the main field of his research is the fabrication and application of conductive polymer film sensor.Haiou Song obtained her Doctor Degree from Jilin University under the supervision of Prof. Vivian Wing-Wah YAM. As a Postdoctoral Fellow, she joined Prof. Aimin Li’s group at Nanjing University in 2010. Now she is an Associate Researcher in School of Environment, Nanjing University. Her current research interests are pollution control and resources reuse of toxic pollutant utilizing hybrid materials.Shuang Wang is a graduate student at Nanjing University of Science and Technology. She received her B.S. degree from Nanjing Forestry University. Her main research topic is the electrochemical sensors.Kangjun Xie is a graduate student at Nanjing University of Science and Technology. His research interest is the application of nanomaterials.Wei Jiang is a Professor, also the executive deputy director in National Special Superfine Powder Engineering and Research Center of China. His research interests involve the micro-nano functional composite materials.Aimin Li is a Professor in School of Environment at Nanjing University. He devotes on the research of pollution control and resources reuse of organic toxic substances well as environmental function materials, also has achieved breakthrough on the control and resources reuse of water-soluble and hard-degraded organic pollution.Anisotropy in magnetic and transport properties of Fe1-xCoxSb2_文档下载
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Anisotropy in magnetic and transport properties of Fe1-xCoxSb2
Anisotropic magnetic and electronic transport measurements were carried out on large single crystals of Fe1-xCoxSb2 (0<= x <=1). The semiconducting state of FeSb2 evolves into metallic and weakly ferromagnetic by substitution of Fe with Co for x<0.5. Furth
AnisotropyinmagneticandtransportpropertiesofFe1 xCoxSb2
RongweiHu,1,2V.F.Mitrovi&#180;c,2andC.Petrovi&#180;c1
CondensedMatterPhysicsandMaterialsScienceDepartment,BrookhavenNationalLaboratory,Upton,NY11973
DepartmentofPhysics,BrownUniversity,Providence,RI02912
(Dated:February2,2008)
AnisotropicmagneticandelectronictransportmeasurementswerecarriedoutonlargesinglecrystalsofFe1 xCoxSb2(0≤x≤1).ThesemiconductingstateofFeSb2evolvesintometallicandweaklyferromagneticbysubstitutionofFewithCoforx&0.5.FurtherdopinginducesstructuraltransformationfromorthorhombicPnnmstructureofFeSb2tomonoclinicP21/http://doc.docsou.comrgemagnetoresistanceand1
0anisotropyinelectronictransportwereobserved.
2 PACSnumbers:
anJ 1I.INTRODUCTION
Previousattemptstoexplaintheunusualmagnetic]landelectronicpropertiesofthenarrow-gapsemicon-eductorFeSi1,2werebasedoneithertheitinerantmag--rnetismmodel,theKondodescription,themixedvalencetsmodel,orthetwo-bandHubbardmodel,andstartedwith.tJaccarino’sinterpretationofanextremenarrow-band-aenergy-gapmodel.3 6Fromthisworktwodi erentview-mpointshave-3emerged.The rst,proposedbyTakahashidandMoriya,treatsFeSiasanearlyferromagneticsemi-nconductorinanitinerantelectronmodel.Thesecond,aspointedoutbyAeppliandFisk,4takesFeSiasatransi-cotionmetalversionoftheKondoinsulatorwithlocalized[ Femoments.Thisviewpointhastheorigininthenarrow 2gap/highdensityofstatesmodelthatJaccarinoconsid-eredandthenrejected.Experimentalcon rmationof0vthatmodelwasachievedbyMandrusetal7andPark5etal.8Otheranalogous3dmodelsystemsarehighlyde-3siredinordertostudythisproblem,particularlythose1ofnon-cubicandstronglyanisotropicstructures.
.1ThemagneticpropertiesofFeSb2stronglyresemble0thoseofFeSi.9,10PreviousinvestigationofFeSb2has8shownthatthemagnetismcanbedescribedbytwoef-0:fects:athermallyinducedPaulisusceptibilityandalowvspintohighspintransitionwithinthet2gmultipletofFeiXioninoctahedralcrystal eld.
InordertoshowthepossibleKondoinsulatortoraheavy-fermionmetaltransition,weperturbedtheFeSb2electronicsystembyelectrondoping.Wereporttheanisotropyinmagneticandelectronictransportproper-tiesofFe1 xCoxSb2asafunctionofCocontent.ThesemiconductinggroundstateofFeSb2evolvesintoametalliconebyx=0.1.FurtherCosubstitutioninducesweakferromagnetismfor0.2≤x&0.5.Beyondx=0.5thereisastructuraltransformationfromorthorhombicPnnmtothemonoclinicP21/cstructureofCoSb2andtherestorationoftheanisotropicsemiconductinggroundstatefor0.5≤x&1.TheweakferromagnetismandhightemperatureCurie-WeissbehaviorisduetothesmallportionoflocalizedCoions.Thelargepositivemagne-toresistancearisesintheFe1 xCoxSb2electronicsystem,
particularlyforxvaluesclosetothemetal-semiconduc-torcrossover.
EXPERIMENTALDETAILS
Singlecrystals,12weregrownwiththehightemperature uxmethod.11TheirstructureandcompositionweredeterminedbyanalyzingpowderX-raydi raction(XRD)spectratakenwithCuKαradiation(λ=1.5418 A)usingaRigakuMini exX-raymachine.Thelatticeparame-terswereobtainedby ttingtheXRDspectrausingtheRieticasoftware.13AJEOLJSM-6500SEMmicroprobewasusedforverifyingtheCoconcentration.CrystalswereorientedusingaLaueCameraandpolishedintorectangularbarsalongspeci ccrystallineaxes.Electri-calcontactsweremadewithEpotekH20Esilverepoxyforastandard4-wireresistancemeasurement.Thedi-mensionsofthesamplesweremeasuredbyahighpre-cisionopticalmicroscopewith10&#181;mresolution.Mag-netization,resistivity,andtransversemagnetoresistancemeasurementswerecarriedoutinaQuantumDesignMPMS-5andaPPMS-9varyingthetemperaturefrom1.8Kto350Kandapplyingamagnetic eldupto90kOe.PolycrystallineaverageswerecalculatedfromM/H≡χ=1/3[χa+χb+χc].HeatcapacitydatawascollectedinthePPMS-9instrumentusingarelaxationtechnique.
RESULTSANDDISCUSSIONA.
CrystalStructure
Fig.1showsthelatticeconstantsandunitcellvol-umeofFe1 xCoxSb2asafunctionofnominalCocon-tent,asdeterminedbypowderX-raydi raction.AscanbeseenfromFig.1,theendmemberstructuresofFe1 xCoxSb2areorthorhombicPnnmandmonoclinicP21/cforFeSb2andCoSb2,respectively.Botha and baxesshowasmoothlineardecreasewithincreasingxfor0≤x&0.5.Incontrast,thea&#184;xisexpandswithincreas-ingxinthesamedopingrange.Atx=0.5,thea&#184;xis
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shows pronounced anisotropy in transport properties..../SiGe heterostructures.8 2 [cm /coul] in Fe1?...x Cox Sb2 (x = 0 - 0.5).6,7 In this ...shows pronounced anisotropy in transport properties..../SiGe heterostructures.8 2 [cm /coul] in Fe1?...x Cox Sb2 (x = 0 - 0.5).6,7 In this ...
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\u\u91cd\u65b0\u8bbe\u7f6e\u8d26\u53f7\u5bc6\u7801"}]展开全部下一篇：机顶盒我们大家都不陌生，因为现在家家户户都有自己的机顶盒，而机顶盒的主要作用就是把数字信号转换为电视信号，并且通过电视的画面和声音显示出来。在我们生活电视变得越来越普及了，并且现在大部分朋友家里安装的都是数字电视，而实现数字电视的最基本设备就是机顶盒。在互联网的大背景下，电视娱乐也变得更加互联网化。今天小编要为大家介绍的这款手机依旧是华为出品的智能手机产品，今天要为大家介绍的这款产品叫做华为p8，这次的评测机型是p8的电信版。今天在办公室的时候偶然听到一个同事在问，华为c8813q电信版能用移动卡吗?这不肺话么?华为作为我国国内手机市场中的一大巨头，它生产出来的手机因为价格便宜而广为大众欢迎，同时因为它是国产手机，国民会在尽大程度上支持华为的发展，所华为可谓是我国国产手机的骄傲，在占领国内市场之后，华为稳扎稳打，尝试进入欧美市场。这几年华为在欧洲市场可谓是发展的风生水起。华为手机一直秉承着低价格、高配置、较高性价比的原则不断地为我们消费者推出性能优秀的手机产品。华为是市面上非常有名的一个手机品牌，该品牌旗下的手机定位大多都是商务手机，外观沉稳大方。华为手机近些年来专注创新，在创新出一个又一个新系列之后华为智能手机已经成为了我国国产智能手机中最著名的智能手机之一，而且华为手机在创新出一系您所在位置： &
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《1FE1 同步电机操作手册.》.pdf
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