GMR in multilayered nanowires electrodeposited in track-etched polyester and polycarbonate membranes

Nasirpouri, Farzad; Southern, Pjd; Ghorbani, Mohammad; zad, Azam Iraji; Schwarzacher, Walther

doi:10.1016/j.jmmm.2006.04.035

Cited by 58 publications

(37 citation statements)

References 11 publications

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“…2,8,9,11 The electron and phonon properties of SLNWs can be manipulated by many parameters, such as segment length, wire diameter, crystal orientation, bilayer thickness, and so on. [16][17][18][19][20][21][22][23][24][25] However, all these SLNWs are synthesized by modulating direct electrodeposition, the crystallinity is relatively not very high, and the interfaces between segments are not distinct. The pulsed electrodeposition, with various processing parameters and higher instantaneous current density, exhibits marked advantages over dc electrodeposition in controlling the deposited grain size, surface morphology, and preferred orientation, and proved to be a viable technological tool in materials engineering.…”

mentioning

confidence: 99%

Template Epitaxial Growth of Thermoelectric Bi/BiSb Superlattice Nanowires by Charge-Controlled Pulse Electrodeposition

Dou

Lei

et al. 2009

J. Electrochem. Soc.

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Bi/BiSb superlattice nanowires ͑SLNWs͒ with a controllable and very small bilayer thickness and a sharp segment interface were grown by adopting a charge-controlled pulse electrodeposition. The deposition parameters were optimized to ensure an epitaxial growth of the SLNWs with a preferential orientation. The segment length and bilayer thickness of the SLNWs can be controlled simply by changing the modulating time, and the consistency of the segment length can be well maintained by our approach. The Bravais law in the electrodeposited nanowires is verified by the SLNW structure. Nanostructured thermoelectric materials can have dramatically higher efficiencies than their bulk counterparts. [1][2][3][4][5][6][7][8][9] The effectiveness of a thermoelectric material could be linked in an approximate way to the dimensionless thermoelectric figure of merit, ZT = S 2 T/, where S, , T, and are, respectively, the Seebeck coefficient, the electrical conductivity, the temperature, and the thermal conductivity.1 Compared to simple quantum wires, quantum dots, quantum wells, and two-dimensional superlattices, the quantum dot superlattices and superlattice nanowires ͑SLNWs͒ exhibit even greater advantages in the enhancement of the figure of merit ͑ZT͒. 3Because the heterogeneous interfaces between the nanodots can block the phonon conduction along the wire axis and thus reduce the lattice thermal conductivity, while the electrical conduction can be sustained and may benefit from the unusual electronic band structures, the SLNWs are especially attractive for thermoelectric applications.10 Recent studies further proved that the increased phonon scattering by grain boundaries would increase the ZT value. 2,8,9,11 The electron and phonon properties of SLNWs can be manipulated by many parameters, such as segment length, wire diameter, crystal orientation, bilayer thickness, and so on. [16][17][18][19][20][21][22][23][24][25] However, all these SLNWs are synthesized by modulating direct electrodeposition, the crystallinity is relatively not very high, and the interfaces between segments are not distinct. The pulsed electrodeposition, with various processing parameters and higher instantaneous current density, exhibits marked advantages over dc electrodeposition in controlling the deposited grain size, surface morphology, and preferred orientation, and proved to be a viable technological tool in materials engineering. 26,27 Bi is especially favorable for studying low dimensional systems and for low temperature thermoelectric applications due to its small electron effective mass and highly anisotropic Fermi surface.28 Calculations have proved that an unprecedented enhancement of the ZT value could be obtained in the Bi 1−x Sb x alloy nanowire system with the variation in x and the diameter of nanowires compared to pure Bi nanowires.29 Some promising work has been done on the Bi 1−x Sb x alloy 30-33 and other Bi-based 34,35 nanowire systems. As a result, the design and fabrication of SLNWs composed of Bi 1−x Sb x segment nanowires is...

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mentioning

confidence: 99%

Template Epitaxial Growth of Thermoelectric Bi/BiSb Superlattice Nanowires by Charge-Controlled Pulse Electrodeposition

Dou

Lei

et al. 2009

J. Electrochem. Soc.

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“…Metallic nanowires can be produced using templateassisted electrodeposition into porous alumina [6,7] or ion-track etched polycarbonate membranes [4,8,9]. This is simple and cost-effective method which enables the production of nanowires in high volume and on large area.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cu Layer Thickness on Morphology and Magnetic Properties of Co/Cu Nanowires

et al. 2018

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We studied changes of morphology and magnetic properties of Co/Cu multilayered nanowires, electrodeposited in polycarbonate membranes, as a function of Cu layer thickness. The morphology and structure of wire assemblies with an average diameter of 200 nm and length of 10 µm, investigated by X-ray diffraction and scanning electron microscopy techniques, revealed polycrystalline structure of Cu and Co layers with smooth lateral surface of nanowires. Overdeposited nanowires created caps which showed flower-like dendrites with shape changing as a function of Cu thickness and electrodeposition parameters. Chemical composition of Co and Cu nanowires analysed by energy dispersive spectroscopy and proton induced X-ray emission showed Cu nanowires free from Co atoms while in Co nanowires, Cu contamination with concentration below 10% was observed. The oxidation traces observed in single-component Cu nanowires did not appear in multilayered nanowires. Magnetic measurements indicated easy axis of magnetization in membrane plane for nanowires with Cu thickness smaller than 20 nm, whereas for larger Cu thicknesses isotropic orientation of magnetization was observed. The presence of Cu atoms in single-component Co nanowires resulted in the appearance of magnetic anisotropy with easy axis along nanowire axis and the increase of coercivity value.

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“…Generally speaking, to control the composition of Co-Ni nanowires, the deposition may be performed in a single electrolyte containing Co and Ni ions [1,2,8,9,11,12,[15][16][17][18][19][20][21]. Another way to control the deposition, which is less common, is to perform the deposition in alternating electrolytes containing either Co or Ni [4,6,22].…”

Section: Introductionmentioning

confidence: 99%

“…Another way to control the deposition, which is less common, is to perform the deposition in alternating electrolytes containing either Co or Ni [4,6,22]. Unlike the deposition in two electrolytes, the deposition in a single electrolyte results in an alloy whose composition can be modified by adjusting the electrolyte concentration [1,2,8,9,11,12,[15][16][17][18][19][20][21]. This method allows for a better control of the composition by managing the deposition protocol (i.e.…”

Section: Introductionmentioning

confidence: 99%

Potential Controlled Co-Ni Nanowires with Compositional Gradient

Tepes¹,

Vrânceanu²,

Cotruț³

et al. 2016

ARA 40th Congress Proceedings

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Co-Ni nanowires with composition gradient were grown by template assisted electrochemical deposition. Using PCTE membrane to grow nanowires makes the deposition of an alloy inside the pores more challenging because the growth is affected by the transport of the electroactive ions into the pores. A novel step-wise deposition-stripping strategy was used to grow NWs with controlled composition along the length of nanowire while maintaining constant the electrolyte composition. A detailed electrochemical analysis was performed to understand and control the Co stripping process, and to demonstrate the applicability of the proposed method. Redox reactions allow us to create custom deposition-stripping programs that enable us to better select and control the potential used to grow the nanowires of controlled composition. Samples were analyzed using scanning electron microscopy (SEM) and EDS. Quantitative analysis performed on samples has revealed that the designed stripping technique and selected potentials resulted in Co-Ni nanowires with up to 3 times more Ni then the samples obtained from similar electrolyte.

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GMR in multilayered nanowires electrodeposited in track-etched polyester and polycarbonate membranes

Cited by 58 publications

References 11 publications

Template Epitaxial Growth of Thermoelectric Bi/BiSb Superlattice Nanowires by Charge-Controlled Pulse Electrodeposition

Template Epitaxial Growth of Thermoelectric Bi/BiSb Superlattice Nanowires by Charge-Controlled Pulse Electrodeposition

Influence of Cu Layer Thickness on Morphology and Magnetic Properties of Co/Cu Nanowires

Potential Controlled Co-Ni Nanowires with Compositional Gradient

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