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High resolution, binder-free investigation of the intrinsic activity of immobilized NiFe LDH nanoparticles on etched carbon nanoelectrodes

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Nano Research 2018年第11期11卷 6034-6044页

作者： Patrick Wilde Stefan Barwe Corina Andronescu Wolfgang Schuhmann Edgar Ventosa Analytical Chemistry - Center for Electroche.mical Sciences (CES) Ruhr-Universitat Bochum Universitasstr. 150 D-44780 Bochum Germany IMDEA Energy Avda. Ramo de la Sagra 3 28935 Motoles Spain

The determination of the intrinsic properties of nanomaterials is essential for their optimization as electrocatalysts, however it poses great challenges from the standpoint of analytical tools and methods. Herein, we report a novel methodology that allows for a binder-free investigation of electrocatalyst nanoparticles. The potential-assisted immobilization of a non-noble metal catalyst, i.e., nickel-iron layered double hydroxide (NiFe LDH) nanoparticles, was employed to directly attach small nanoparticle ensembles from a suspension to the surface of etched carbon nanoelectrodes. The dimensions of this type of electrodes allowed for the immobilization of the catalyst material below the picogram scale and resulted in a high resolution towards the faradaic current response. In addition the effect of the electrochemical aging on the intrinsic activity of the catalyst was investigated in alkaline media by means of continuous cyclic voltammetry. A change in the material properties could be observed, which was accompanied by a substantial decrease in its intrinsic activity.

关键词： oxygen evolution reaction nickel-iron layered double hydroxide (NiFe LDH) immobilization nanoelectrocatalysis nanoelectrodes nanoimpacts

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Fabrication and characteristic detection of graphene nanoelectrodes

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Science China(Technological Sciences) 2014年第10期57卷 1950-1955页

作者： XIE ShuangXi LIU ZengLei JIAO NianDong TUNG Steve LIU LianQing State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Mechanical Engineering University of Arkansas

Graphene has the advantages of high electrical conductivity,high heat conductivity,and low noise,which makes it a potential option for integrated circuits interconnection and *** this paper,we present a novel fabrication method for graphene nanoeletrodes with ***,graphene grown by chemical vapor deposition(CVD)is assembled to a chip with ***,an atomic force microscopy(AFM)based mechanical cutting method is developed to cut the graphene into nanoribbons and nanoeletrodes with *** the electronic property of a single nanodot is characterized using the garphene nanoelectrodes,demonstrating the effectiveness of the graphene *** fabricated graphene nanoeletrode pairs can be used as probes to detect single molecule in micro-environment,and show an attractive prospect for future molecular electronics applications.

关键词： atomic force microscopy graphene nanoelectrodes nanogap molecular electronics

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ChemFET gas nanosensor arrays with alignment windows for assembly of single nanowires

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Nano Research 2023年第7期16卷 10234-10244页

作者： Ondřej Chmela Imrich Gablech Jakub Sadílek Jan Brodský Stella Vallejos Central European Institute of Technology Brno University of TechnologyPurkyňova 12361200 BrnoCzech Republic Faculty of Electrical Engineering and Communication Brno University of TechnologyDepartment of MicroelectronicsTechnická3058/1061200 BrnoCzech Republic Instituto de Microelectrónica de Barcelona(IMB-CNM CSIC)Campus UABCarrer dels Til·lersCerdanyola del Vallès08193 BarcelonaSpain

This work focuses on the fabrication and characterization of Chemical Field-Effect Transistor(ChemFET)gas nanosensor arrays based on single nanowire(SNW).The fabrication processes include micro and nanofabrication techniques enabled by a combination of ultraviolet(UV)and e-beam lithography to build the ChemFET *** show the integration and connection of SNWs across the multiple pairs of nanoelectrodes in the ChemFET by dielectrophoresis process(DEP)thanks to the incorporation of alignment windows(200-300 nm)adapted to the diameter of the *** of the SNW ChemFET array's output and transfer characteristics prove the influence of gate bias on the drain current *** upon hydrogen(H_(2))and nitrogen dioxide(NO_(2))as analyte models of reducing and oxidizing gases show the ChemFET sensing ***,results demonstrate better response characteristics to H_(2)when the ChemFET operates in the subthreshold *** design concepts and methods proposed for fabricating the SNW-based ChemFET arrays are versatile,reproducible,and most likely adaptable to other systems where SNW arrays are required.

关键词： Chemical Field-Effect Transistor(ChemFET)nanosensors nanowires nanoelectrodes gas sensors

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