Fabrication and characterization of crystalline copper nanowires by electrochemical deposition inside anodic alumina template

Copper nanowires were fabricated by electrochemical deposition inside anodic alumina template anodized on aluminum substrate. The morphology, composition and structure of the copper nanowires were characterized by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive (EDS) and X-ray diffraction spectroscopy (XRD). The results revealed that copper nanowires were dense, continuous, highly-crystalline and uniform with diameters. The electrical properties of copper nanowires wrer characterized with two-terminal electrical measurements. Different current-voltage (I-V) characteristics of single copper nanowire were observed and possible conductive mechanisms were discussed. The crystalline copper nanowires are promising in application of future nanoelectronic devices and circuits. © 2013 The Author(s)

Fabrication and Electrical Characterization of Multiwalled Carbon Nanotube-Based Circuit at Room Temperature

Multiwalled carbon nanotube (MWCNT) deposited on a pair of predetermined aluminum electrodes treated with the (3-Aminopropyl)-triethoxysilane (APTES) self-assembled monolayers (SAMs). The MWCNT bridges electrodes and forms electrode/MWCNT/electrode circuit on silicon with 500 nm silicon dioxide. Then the Metal (Ti/Au) pads were fabricated on MWCNT to bury the MWCNT into metal electrodes. The electrical properties of MWCNT-based circuits before and after the fabrication of metal pads were characterized. Results indicate that metal pads on MWCNT improved the electrical properties MWCNT-based circuit largely

Fabrication of one-dimensional Ag/multiwalled carbon nanotube nano-composite

Composite made of multiwalled carbon nanotubes coated with silver was fabricated by an electroless deposition process. The thickness of silver layer is about 40 to 60 nm, characterized as nano-crystalline with (111) crystal orientation along the nanotube's axial direction. The characterization of silver/carbon nanotube [Ag/CNT] nanowire has shown the large current carrying capability, and the electric conductivity is similar to the pure silver nanowires that Ag/CNT would be promising as building blocks for integrated circuits

Simplified Fabrication And Electrical Analysis Of Crystalline Silver Nanowire

Silver nanowires have been fabricated using electrochemical deposition within the confined nanochannels of anodic alumina membrane on aluminum substrate. The characterization of structure, morphology, and composition indicates that the silver nanowires are uniform with about 50 nm diameter corresponding to the pore diameter of the anodic alumina membrane and almost single crystal with preferred growth along the [111] direction. Electrical measurements at room temperature showed that these silver nanowires were high conductive with a conductivity of approximately 0.13×10 5 S/cm. Also, individual silver nanowires were investigated by measuring current as a function of bias voltage until the point of failure. This study will be very useful for the development of future nanoelectronic devices and circuits that employ Ag nanowires. © 2011 Springer-Verlag

The Synthesis Of A Copper/Multi-Walled Carbon Nanotube Hybrid Nanowire In A Microfluidic Reactor

Metallic nanowires are promising as components in nanoscale systems including nanoelectronics. However, the application of nanowires made of a single material is limited by the properties of the material used. We report here an effort to fabricate a hybrid copper-coated carbon nanotube (CNT) - Cu/CNT nanowire, using a microfluidic reactor. The fabrication of copper/multi-walled carbon nanotube (MWCNT) hybrid nanowires was realized by an electroless copper deposition technique in which MWCNT templates and an electrolyte were introduced separately into the microfluidic reactor. The morphology and structure of the Cu/MWCNT hybrid nanowire were studied by means of transmission electron microscopy (TEM), selected-area electron diffraction (SAED), scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX), as well as XRD. Results reveal that the fabricated Cu/MWCNT hybrid nanowires are continuously covered by crystallized copper with a preferred crystal orientation along the (111) planes in the radial direction of the MWCNTs. These structural properties are attributed to the unique reaction environment including laminar flow and diffusion-controlled reaction. © 2009 IOP Publishing Ltd

Fabrication Of Copper/Multi-Walled Carbon Nanotube Hybrid Nanowires Using Electroless Copper Deposition Activated With Silver Nitrate

This study aims at developing new linear matrix inequality (LMI) conditions for robust D-stability and D-stabilisation of linear time-invariant uncertain systems in polytopic domains. An existing LMI condition for robust D-stability is lifted into those of larger dimensions that are given as functions of a certain integer κ. Based on the consequent conditions, new sufficient conditions for the existence of a state-feedback control law ensuring the robust D-stability of the closed-loop system is proposed in terms of LMIs. Finally, examples are given to illustrate the benefit of the proposed methods. © 2011 The Institution of Engineering and Technology

Ultrasonic-Assisted Fabrication Of Highly Dispersed Copper/Multi-Walled Carbon Nanotube Nanowires

Highly dispersed copper/multi-walled carbon nanotube (MWCNT) nanowires have been fabricated using ultrasonic-assisted electroless copper plating. The structures of the Cu/MWCNT nanowires were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX). The study clearly demonstrates the advantages of the ultrasonic technique on electroless copper plating on MWCNT, including an enhanced electroless copper deposition rate, improved interfacial bonding as well as preventing Cu/MWCNT nanowires from aggregating. © 2009 Elsevier B.V. All rights reserved

Effects of corundum-structured seeds on the low-temperature growth and hardness of the alumina-based films

The corundum-structured seeds have been introduced into alumina films using Al +  α -Al _2 O _3 composite and Al _100−x Cr _x (x = 10, 20, 30) alloy as targets by reactive magnetron sputtering. The effects of the seeds on the elemental composition, phase composition, structure characteristic, surface morphology and nano-hardness of the alumina-based films have been investigated. The Al target has also been sputtered to prepare the alumina film as reference. The film is composed of single-phase α -Al _2 O _3 by sputtering the Al +  α -Al _2 O _3 composite target at 550 °C, while the solid solution α -type (Al _0.7 Cr _0.3 ) _2 O _3 was detected in the film prepared with the Al _70 Cr _30 target at the same temperature. The nano-hardness of the pure α -Al _2 O _3 film and the α -(Al _0.7 Cr _0.3 ) _2 O _3 film were measured as ∼23.5 GPa and ∼28.5 GPa, respectively, which are much higher than that of the film deposited from Al target (∼16.3 GPa)