Effect of Co2+ concentration on the crystal structure of electrodeposited Co nanowires

Mukhtar, Aiman; Mehmood, Tahir; Khan, Babar Shahzad; Tan, Ming

doi:10.1016/j.jcrysgro.2016.02.009

Cited by 20 publications

(13 citation statements)

References 21 publications

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“…(4) N c has an inverse relation with overpotential: higher overpotential smaller critical clusters can be formed. Higher potential of -3v in our case smaller critical clusters can be formed; smaller critical clusters favor the formation of fcc structure [22]. It is known [23] that the saturation nucleus density (N s ) is related to maximum value of current (i max ) and time (t m ) at which the current has maximum value, so smaller t m and larger i max can corresponds to larger N s .…”

Section: Discussionmentioning

confidence: 61%

Electrodeposition of Single Crystalline Co56.48Ni43.52 Alloy Nanowires in AAO Template

Mukhtar¹

2017

AJEA

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Abstract:Single crystalline cobalt nickel (Co-Ni) alloy nanowires are successfully fabricated using direct current (DC) electrodeposition with in the nanopore of highly ordered anodized aluminum oxide (AAO) template. SEM studies show that the average diameter of the alloy nanowires is approximately equal to 50 nm which corresponds to the pore size of the AAO template. Energy-dispersive X-ray (EDX) analysis confirmed that the Co-Ni alloy nanowires are deposited with 56.48:43.52 atomic ratios. We believe that at high potential the current density of Co nanowires is higher than depositing Ni nanowires which are clear by polarization curves, so content of Co increases in deposited Co 56.48 Ni 43.52 alloy nanowires. Single crystalline Co 56.48 Ni 43.52 alloys can be useful in future to compose and synthesize other metal nanostructures via template-based electrodeposition.

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Section: Discussionmentioning

confidence: 61%

Electrodeposition of Single Crystalline Co56.48Ni43.52 Alloy Nanowires in AAO Template

Mukhtar¹

2017

AJEA

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“…Electrodeposition is versatile and simple technique to synthesize the 1-D magnetic nano materials. [22][23][24][25][26][27][28][29] Fe and Mn materials are chosen based on the idea that, the nanometer Fe has very large magnetic susceptibility, and paramagnetic Mn has many unpaid electrons in their outer most shell, by combining the two materials as 1-D multilayer structure, the biocompatibility and high sensitivity can be obtain to provide the required MR images.…”

Section: Prepared Fe 3 O 4 @Gd 2 O 3 Core-shellmentioning

confidence: 99%

“…To address the above stated problems, one‐dimensional Fe/Mn multilayered NWs, and single component Fe and Mn NWs was prepared by electrodeposition in 30 nm diameter anodic aluminum oxide (AAO) template. Electrodeposition is versatile and simple technique to synthesize the 1‐D magnetic nano materials 22‐29 . Fe and Mn materials are chosen based on the idea that, the nanometer Fe has very large magnetic susceptibility, and paramagnetic Mn has many unpaid electrons in their outer most shell, by combining the two materials as 1‐D multilayer structure, the biocompatibility and high sensitivity can be obtain to provide the required MR images.…”

Section: Introductionmentioning

confidence: 99%

Fe/Mn multilayer nanowires as dual mode T₁–T₂ magnetic resonance imaging contrast agents

Cao

Mukhtar

et al. 2020

J Biomed Mater Res

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To overcome the negative contrast limitations, and to improve the sensitivity of the magnetic resonance signals, the mesoporous silica coated Fe/Mn multilayered nanowires (NWs) were used as a T1–T2 dual‐mode contrast agents (CAs). The single component Fe and Mn NWs, and Fe/Mn multilayer NWs were synthesized by electrodeposition in the homemade anodic aluminum oxide (AAO) templates with the aperture of about 30 nm. The structural characterization and morphology of single component and multisegmented NWs was done by X‐ray diffraction and transmission electron microscopy. The elemental composition of Fe/Mn multilayerd NWs was confirmed by energy‐dispersive X‐ray and energy‐dispersive spectrometer. Vibrating sample magnetometer was used to test the magnetic properties, and 1.5 T magnetic resonance imaging (MRI) scanner was used to measure the relaxation efficiency. Importantly, the MRI study indicated that the Fe/Mn multilayer NWs showed a significant T1–T2 imaging effect, and have longitudinal relaxivity (r1) value, that is, 1.25 ± 0.0329 × 10−4 μM−1 s−1 and transverse relaxivity (r2), that is, 5.13 ± 0.123 × 10−4 μM−1 s−1, which was two times of r1 value (0.654 ± 0.00899 × 10−4 μM−1 s−1) of Mn NWs, and r2 value (2.96 ± 0.0415 × 10−4 μM−1 s−1) of Fe NWs. Hence, Fe/Mn multilayer NWs have potential to be used as T1–T2 dual‐mode CAs.

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“…The reason for this is because the sites for dehydration on atomically rough planes are larger in number than smooth planes [119]. The change in phase transformation of Co NWs was seen (i.e., from hcp to fcc) by changing the deposition parameters [120,121,122], and a group of studies by Mukhtar et al [123,124,125,126,127] showed that the smaller grain size of Co favors the formation of fcc Co NWs, and larger grain size favors the formation of hcp Co NWs. Similarly, the mixture of hcp and fcc phases was observed in Co NWs, which seems to crystallize in early stage of deposition, and later with the increase in deposition time as the length of Co NWs increases, they crystallize into the hcp phase [128].…”

Section: Electrodeposition and Structure Of Multi-segmented Nws Inmentioning

confidence: 99%

Multi-Segmented Nanowires: A High Tech Bright Future

Wang

Mukhtar

et al. 2019

Materials

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In the last couple of decades, there has been a lot of progress in the synthesis methods of nano-structural materials, but still the field has a large number of puzzles to solve. Metal nanowires (NWs) and their alloys represent a sub category of the 1-D nano-materials and there is a large effort to study the microstructural, physical and chemical properties to use them for further industrial applications. Due to technical limitations of single component NWs, the hetero-structured materials gained attention recently. Among them, multi-segmented NWs are more diverse in applications, consisting of two or more segments that can perform multiple function at a time, which confer their unique properties. Recent advancement in characterization techniques has opened up new opportunities for understanding the physical properties of multi-segmented structures of 1-D nanomaterials. Since the multi-segmented NWs needs a reliable response from an external filed, numerous studies have been done on the synthesis of multi-segmented NWs to precisely control the physical properties of multi-segmented NWs. This paper highlights the electrochemical synthesis and physical properties of multi-segmented NWs, with a focus on the mechanical and magnetic properties by explaining the shape, microstructure, and composition of NWs.

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Effect of Co2+ concentration on the crystal structure of electrodeposited Co nanowires

Cited by 20 publications

References 21 publications

Electrodeposition of Single Crystalline Co<sub>56.48</sub>Ni<sub>43.52</sub> Alloy Nanowires in AAO Template

Electrodeposition of Single Crystalline Co<sub>56.48</sub>Ni<sub>43.52</sub> Alloy Nanowires in AAO Template

Fe/Mn multilayer nanowires as dual mode T₁–T₂ magnetic resonance imaging contrast agents

Multi-Segmented Nanowires: A High Tech Bright Future

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Effect of Co2+ concentration on the crystal structure of electrodeposited Co nanowires

Cited by 20 publications

References 21 publications

Electrodeposition of Single Crystalline Co&lt;sub&gt;56.48&lt;/sub&gt;Ni&lt;sub&gt;43.52&lt;/sub&gt; Alloy Nanowires in AAO Template

Electrodeposition of Single Crystalline Co&lt;sub&gt;56.48&lt;/sub&gt;Ni&lt;sub&gt;43.52&lt;/sub&gt; Alloy Nanowires in AAO Template

Fe/Mn multilayer nanowires as dual mode T1–T2 magnetic resonance imaging contrast agents

Multi-Segmented Nanowires: A High Tech Bright Future

Contact Info

Product

Resources

About

Electrodeposition of Single Crystalline Co<sub>56.48</sub>Ni<sub>43.52</sub> Alloy Nanowires in AAO Template

Electrodeposition of Single Crystalline Co<sub>56.48</sub>Ni<sub>43.52</sub> Alloy Nanowires in AAO Template

Fe/Mn multilayer nanowires as dual mode T₁–T₂ magnetic resonance imaging contrast agents