Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/242315
Type: Artigo de periódico
Title: Dielectrophoretic Manipulation Of Individual Nickel Nanowires For Electrical Transport Measurements
Author: Puydinger dos Santos
Marcos V.; Lima
Lucas P. B.; Mayer
Rafael A.; Beron
Fanny; Pirota
Kleber R.; Diniz
Jose A.
Abstract: Nanowires (NW) have received much attention due to their high aspect ratio, shape anisotropy, relatively large surface area and particular electron transport properties. In addition, since NW present low current levels and high sensitivity, they can be used as sensor devices for several applications. One of the major challenges when dealing with transport measurements in NW is to trap them between electrodes, which allow electrical characterization and therefore fabrication of nanowire-based devices. Electrically neutral NW can be deposited by dielectrophoresis (DEP) method, which requires the application of an alternating electric field between electrodes. In this work, properly dispersed Ni nanowires (NiNW) (length = 4+/-1 mu m, diameter = 35+/-5 nm) were deposited on top of Pt electrodes using the DEP method. The effects of electrodes geometry and electric field frequency on DEP efficiency were evaluated. For optimized DEP parameters, the process efficiency is up to 85%. The deposited NiNW exhibit a Schottky-like current versus voltage behavior due to the high contact resistance between NiNW and electrode. Its reduction down to two orders of magnitude, reaching value less than the NiNW resistance (similar to 6k Omega), was achieved by depositing a 10 nm-thick Pt layer over the NW extremities. Therefore, this method presents a selection of adequate electrical DEP parameters and electrode geometry, making it a suitable process of NW deposition and electrical characterization. This can be used for investigation of electrical transport properties of individual NW and fabrication of NW-based devices, like sensors and field effect transistors. (C) 2015 American Vacuum Society.
Subject: Beam
Fabrication
Conductivity
Particles
Motion
Ni
Country: MELVILLE
Editor: A V S AMER INST PHYSICS
Citation: Dielectrophoretic Manipulation Of Individual Nickel Nanowires For Electrical Transport Measurements. A V S Amer Inst Physics, v. 33, p. MAY-2015.
Rights: aberto
Identifier DOI: 10.1116/1.4918732
Address: http://scitation.aip.org/content/avs/journal/jvstb/33/3/10.1116/1.4918732
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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