检索结果-南通市图书馆

Electrical Conductivity and Current-Voltage Characteristics of Individual Conducting Polymer PEDOT Nanowires

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2008年第9期25卷 3474-3477页

作者：龙云泽 DUVAIL jean-Luc 陈兆甲金爱子顾长志 College of Physics Science Qingdao University Qingdao 266071 institut des materiaux jean rouxel Universite de Nantes CNRS 44322 Nantes Prance Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190

We report the current-voltage （Ⅰ-Ⅴ） characteristics and electrical conductivity of individual template-synthesized poly（3,4-ethylenedioxythiophene）（PEDOT） nanowires （190 ± 6 nm in diameter and δRT = 11.2 ± 2Ω^-1 cm^-1） over a wide temperature range from 300 to 10K. With lowering temperature, the Ⅰ - Ⅴ characteristics become nonlinear around 50K, and a clear Coulomb gap-like structure appears in the differential conductance （dI/dV） spectra. The temperature dependence of the resistance below 70 K follows In R α T^-1/2, which can be interpreted as Efros-Shklovskii hopping conduction in the presence of a Coulomb gap. In addition, the influences of measurement methods such as the applied bias voltage magnitude, the two-probe and four-probe techniques used in the resistance measurements are also reported and discussed.

关键词： FIELD-EFFECT TRANSISTORS JUNCTIONS Current--Voltage Characteristics

Current-voltage characteristics of individual conducting polymer nanotubes and nanowires

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第6期18卷 2514-2522页

作者：龙云泽尹志华李蒙蒙顾长志 Duvail jean-Luc 金爱子万梅香 College of Physics Science Qingdao University institute of Physics Chinese Academy of Sciences institut des Mat'eriaux jean rouxel Universit'e de Nantes institute of Chemistry Chinese Academy of Sciences

We report the current-voltage （I-V） characteristics of individual polypyrrole nanotubes and poly（3,4- ethylenedioxythiophene）（PEDOT） nanowires in a temperature range from 300 K to 2 K. Considering the complex structures of such quasi-one-dimensional systems with an array of ordered conductive regions separated by disordered barriers, we use the extended fluctuation-induced tunneling （FIT） and thermal excitation model （Kaiser expression） to fit the temperature and electric-field dependent I-V curves. It is found that the I-V data measured at higher temperatures or higher voltages can be well fitted by the Kaiser expression. However, the low-temperature data around the zero bias clearly deviate from those obtained from this model. The deviation （or zero-bias conductance suppression） could be possibly ascribed to the occurrence of the Coulomb-gap in the density of states near the Femi level and/or the enhancement of electron-electron interaction resulting from nanosize effects, which have been revealed in the previous studies on low-temperature electronic transport in conducting polymer films, pellets and nanostructures. In addition, similar I--V characteristics and deviation are also observed in an isolated K0.27MnO2 nanowire.

关键词： conducting polymers I-V curves nanotubes/wires

Modelling of photovoltaic production and electrochemical storage in an autonomous solar drone

在线全文

学校读者我要写书评

暂无评论

eScience 2022年第2期2卷 235-241页

作者： Mickael Cosson Benjamin David Ludovic Arzel Philippe Poizot Ahmed Rhallabi Nantes Universite CNRSInstitut des Materiaux de Nantes Jean Rouxel2 rue de la Houssiniere44322NantesFrance XSun 1 Route de la Croix Moriau44350GuerandeFrance

A simple,efficient simulator has been developed to predict the generation of photovoltaic energy and its storage in Li-ion batteries,for an autonomous drone with four wings covered by solar panels based on thin-film gallium arsenide photovoltaic cells(III–V).This simulator allows prediction of the effective photovoltaic power produced by the solar panels as well as the battery pack voltage when the drone is *** parameters such as irra-diance,sun inclination angles,and drone Euler angles are considered as input *** measured photovoltaic power and battery pack voltage are in good agreement with the simulated values,making practical use by the XSun company *** parametric study shows the effects of climatic and geographic conditions on drone *** optimal weather conditions on a sunny day,drone flight can last 12 h.

关键词： Unmanned aerial vehicle Drone flight simulator Simulation Energy storage Photovoltaic energy

Symmetric and Anti-Symmetric Lamb Waves in a Two-Dimensional Phononic Crystal Plate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第7期27卷 165-168页

作者：李勇侯志林傅秀军 Badreddine M Assouar Department of Physics South China University of Technology Guangzhou 510640 institut jean Lamour (UHP-CNRS) UMR 7198 Deartement Physique de la Matiere et des Materiaux (P2M) France

It is weft known that Lamb waves in a plate with a mirror plane can be separated into two uncoupled sets： symmetric and anti-symmetric modes. Based on this property, we present a revised plane wave expansion method （PWE） to calculate the band structure of a phononie crystal （PC） plate with a mirror plane. The developed PWE method can be used to calculate the band structure of symmetric and anti-symmetric modes separately, by which the depending relationship between the partial acoustic band gap （PABG）, which belongs to the symmetric and anti-symmetric modes alternatively, and the position of the scatterers can be determined. As an example of its application, the band structure of the Lamb modes in a two-dimensional PC plate with two layers of void circular inclusions is investigated. The results show that the band structure for the symmetric and anti-symmetric modes can be changed by the position of the scatterers drastically, and larger PABGs will be opened when the scatterers are inserted into the area of the plate, where the elastic potential energy is concentrated.

关键词： Separators Platanus Separating Lambs Parturition Computers Methods Broadcasting

Improved photoconductive properties of composite nanofibers based on aligned conjugated polymer and single-walled carbon nanotubes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2013年第2期6卷 149-158页

作者： Florian Massuyeau Yuanchun Zhao Abdel Aziz El Mel Abu Yaya Frederic Geschier Eric Gautron Serge Lefrant jean Yves Mevellec Chris Ewels Chain-Shu Hsu Eric Faulques Jany Wery jean Luc Duvail fnstitut des materiaux jean rouxel UMR6502 CNRS Universite de Nantes 2 rue de la Houssiniere F-44322 Nantes France Department of Applied Chemistry Chiao Tung University 1001 Ta Hsueh Road Hsin-Chu 30010 Taiwan China

We successfully address the challenge of aligning single-walled carbon nanotubes （SWNTs） and conjugated polymer chains in composite nanofibers for enhancing their opto-electrical properties. A pore-filling template strategy has been developed to prepare such nanocomposites from SWNTs and poly（para-phenylene vinylene）（PPV） chains, with both species well-oriented aligned along the pore axis. Addition of the SWNTs leads to a remarkable increase in photocurrent of four orders of magnitude as compared to equivalent pristine PPV nanofibers. Further analysis indicates that the strong photocurrent enhancement is not simply an effect of alignment, but additionally benefits from alignment-enhanced interaction of polymer chains with SWNTs, as supported by density functional theory （DFT） calculations.

关键词： Tubular nanocomposites single-walled carbonnanotube (SWNT) photoconductivity transport properties conjugated polymer density functional theory (DFT)calculation

Thin films of binary amorphous Zn-Zr alloys developed by magnetron co-sputtering for the production of degradable coronary stents:A preliminary study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2018年第4期3卷 385-388页

作者： Nathalie Annonay Fatiha Challali Marie-Noelle Labour Valerie Bockelee A.Garcia-Sanchez Florent Tetard Marie-Paule Besland Philippe Djemia Frederic Chaubet Laboratoire de Science des materiaux et des Procedes UPR CNRS 3407Universite Paris 13Sorbonne-Paris-CiteInstitut Galilee99 av J.B.Clement93430VilletaneuseFrance Laboratory for Vascular Translational Science Inserm U1148Universite Paris 13Universite Paris-DiderotSorbonne-Paris-CiteInstitut Galilee99 av J.B.Clement93430VilletaneuseFrance institut des materiaux jean rouxel(IMN)UMR CNRS 6502 Universite de Nantes2rue de la HoussiniereB.P.3222944322Nantes Cedex 3France

*** Vascular stents are endo-prostheses that allow the restoration of blood flow in case of obstruction of a vessel.A stent usually consists of a corrosion-resistant metal such as Nitinol,316L steel or a CoCr alloy[1].Many studies have been undertaken for the production of polymer degradable stents[2,3]or metallic stents[4,5]and,among these,devices made of pure zinc or crystallized alloy based on zinc obtained by molding and extrusion are promising in terms of biodegradability,biocompatibility and mechanical properties[6],but also concerning the degradation rate of the stent which should to be effective until arterial remodeling and tissue healing are complete[5].The objective of this preliminary study is the comparison of the degradation in simulated biological medium and the endothelial cytotoxicity of amorphous and crystallized thin ZnZr films according to their composition and *** this work,the thin layers were deposited on silicon substrates by magnetron *** technology is already used to make metal stents[7,8].

关键词： alloy alloys corrosion

Interest of molecular functionalization for electrochemical storage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2017年第12期10卷 4175-4200页

作者： Bihag Anothumakkool Dominique Guyomard Joel Gaubicher Lenaic Madec institut des materiaux jean rouxel (IMN) Universite de Nantes CNRS 2 rue de la Houssiniere BP32229 44322 Nantes Cedex 3 France IPREM-ECP CNRS UMR 5254 Universite de Pau Helioparc Pau Pyrenees 2 av. PierreAngot 64053 Pau Cedex 9 France Reseau sur le Stockage Electrochimique de I'Energie (RS2E) CNRS FR3459 33 Rue Saint Leu 80039 Amiens Cedex France

despite great interests in electrochemical energy storage systems for numerous applications, considerable challenges remain to be overcome. Among the various approaches to improving the stability, safety, performance, and cost of these systems, molecular functionalization has recently been proved an attractive method that allows the tuning of material surface reactivity while retaining the properties of the bulk material. For this purpose, the reduction of aryldiazonium salt, which is a versatile method, is considered suitable; it forms robust covalent bonds with the material surface, however, with the formation of multilayer structures and sp3 defects （for carbon substrate） that can be detrimental to the electronic conductivity. Alternatively, non-covalent molecular functionalization based on π-π interactions using aromatic ring units has been proposed. In this review, the various advances in molecular functionalization concerning the current limitations in lithium-ion batteries and electrochemical capacitors are discussed. According to the targeted applications and required properties, both covalent and non-covalent functionalizafion methods have proved to be very efficient and versatile. Fundamental aspects to achieve a better understanding of the funcfionalization reactions as well as molecular layer properties and their effects on the electrochemical performance are also discussed. Finally, perspectives are proposed for future implementation of molecular functionalization in the field of electrochemical storage.

关键词： electrochemical storage molecularfunctionalization covalent diazoniumchemistry non-covalent π-π interactions

Toward Rational Composite Electrodes for Improved Li Batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

复旦学报（自然科学版） 2007年第5期46卷 686-页

作者： B.Lestriez E.Ligneel D.Guyomard institut des Matériaux jean rouxel CNRS UMR 6502Université de Nantes

1 Results Although electrodes for lithium batteries are generally prepared with standard formulations and routine processing conditions,more and more studies report relationships between processing conditions,composite electrode morphology and electrochemical *** our previous work,we obtained a 50% increase of the cycling capacity of Li1.1V3O8 based electrodes after using a PEO binder which had been pre-plasticized by the solvent (ethylene carbonate (EC) + propylene carbonate (PC)) of the liq...

关键词： lithium battery composite material electrode processing

Origin of Capacity Fading for Nano-grains Based Electrodes of Li Rechargeable Batteries

在线全文

学校读者我要写书评

暂无评论

复旦学报（自然科学版） 2007年第5期46卷 683-页

作者： J.Gaubicuer F.Tanguy P.Soudan V.Mauchamp D.Guyomard institut des Matériaux jean rouxel 2 rue de la Houssinière 44322 Nantes France

1 Results Li1+xV3O8,has been extensively investigated as a positive electrode material for lithium metal polymer batteries and a great deal of interest has been focused on the structural characterization and cyclability of this compound[1-6].From the present work,Li1.1V3O8 nanograins synthesized at low temperature from original two component gel precursor suffer from strong capacity fading on *** latter is characterized by emergence of polarized redox processes at the expense of initial ***...

关键词： lithium batteries capacity fading interfacial reactions