Nickel nanowires of 4 nm diameter in the cavity of carbon nanotubes

Pradhan, Bhabendra K.; Kyotani, Takashi; Tomita, Akira

doi:10.1039/a904157e

Cited by 121 publications

(71 citation statements)

References 21 publications

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“…It is worthy to note that the conversion of iron to iron oxide takes place when the Fe/C/AAO is exposed to air and during the removal of the AAO template, because of the high reactivity of the nanometer sized iron paticles. By using the MOCVD technique, nickel nanowires with a diameter of 4 nm were also filled into the cavity of CNTs with an inner diameter of 20 nm using cobaltocene as precursor [127]. Therefore, nanowires and nanoparticles can be selectively filled in CNTs using the sublimation method.…”

Section: Sublimation Methodsmentioning

confidence: 99%

“…The AAO-CNTs used can be either one-side open or both-side open. Foreign matters can be loaded into the carbon-deposited AAO template by using incipient wetness impregnation [40,42,[118][119][120][121], sublimation [122][123][124][125][126][127], or electrodeposition method [41,109,[128][129][130][131]. Since only the inner surface of the AAO-CNTs is exposed, the foreign matters would be selectively filled inside the hollow cores of CNTs.…”

Section: Filling Of Aao-cntsmentioning

confidence: 99%

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Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

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Section: Sublimation Methodsmentioning

confidence: 99%

Section: Filling Of Aao-cntsmentioning

confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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“…[6] However, little work on the preparation of Ni 1D nanostructures in aqueous solution has been reported to date. [7] Such a solution-phase approach may provide a more promising technique for preparing 1D nanostructures than conventional methods in terms of cost and potential for large-scale production.…”

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confidence: 99%

Complex‐Surfactant‐Assisted Hydrothermal Route to Ferromagnetic Nickel Nanobelts

et al. 2003

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Nickel is an important ferromagnetic material. Anisotropic magnetic nanoparticles are expected to exhibit interesting magnetic properties.[1] Nickel one-dimensional (1D) nanostructures have thus attracted much attention recently because of their potential applications in magnetic sensors and memory devices.[2] Different Ni 1D nanostructures have been successfully synthesized by various methods. [3±5] Currently, the fabrication of Ni nanowires mainly depends on a template technique that involves electrochemical deposition or metal± organic chemical vapor deposition (CVD) of metals into the nanopores of template materials, such as anodic alumina (AAO) film [3] and carbon nanotubes.[6] However, little work on the preparation of Ni 1D nanostructures in aqueous solution has been reported to date. [7] Such a solution-phase approach may provide a more promising technique for preparing 1D nanostructures than conventional methods in terms of cost and potential for large-scale production.[8] Here we report a complex-surfactant-assisted hydrothermal reduction method to synthesize single-crystal Ni nanobelts with high yield. Ni nanobelts were generated by reducing a Ni II -tartrate complex in alkaline solution and in the presence of a suitable surfactant at relatively low temperature (110 C). These nanobelts had typical widths of 500±1000 nm, a thickness of onlỹ 15 nm, and lengths of up to 50 lm. This new type of nanostructure of a ferromagnetic metal should be explored in physical property studies and for interesting applications as a new kind of nanoblock.Practically, the present approach to the synthesis of Ni nanobelts is similar to the process for electroless Ni plating. [9] In our study, sodium tartrate (Na 2 C 4 H 4 O 6 ) was used as the complexing reagent to form a complex, Ni(C 4 H 2 O 6 ) 2± . The formation of Ni II complex sharply decreased the free Ni 2+ concentration in the solution, which resulted in a relatively slow rate of generation of Ni atoms. A slow reaction rate was favorable for separating the growth step from the nucleation step. For this reason, we selected a high concentration of both tartrate and alkali. Nevertheless, we found that adjusting the concentrations of tartrate and NaOH was not sufficient for the formation of 1D nanostructures. In this case, only spongelike Ni particles were produced. In the solution-phase synthesis of nanocrystals, kinetically controlling the nucleation and growth rate could conceivably modulate the size and shape of the final products.[10] Some recent work has suggested that the shape of the nanocrystals can be effectively modulated by adding chemical capping reagents to the synthetic systems. It is believed that the selective interaction of the capping molecules on a facet of the first-formed nanoparticles is the key to anisotropic growth of nanoparticles. [4,11] In this work, in order to achieve the desired Ni nanobelts, the anion surfactant sodium dodecyl benzenesulfonate (SDBS) was introduced to the synthesis system. We found that SDBS had a remarkable effect o...

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“…Thus, the synthesis and application of these metal-filled CNTs is an important and challenging research area. For the synthesis of CNTs incorporating metals and metal oxides, various kinds of techniques have been developed, including capillary action [4][5][6] , arc-discharge method [7][8][9] , wet chemical method [10,11] , catalyzed hydrocarbon [12] and pyrolyzing carbon-metal composites in Ar atmosphere [13] . However, in those conventional synthesis methods, the growth temperatures higher than 500 o C are generally required for the metal-filled CNT growth.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Magnetic Properties of Fe-incorporated Carbon Nanofibers by Ion-irradiation Method

Wang

Zamri

Hihara

et al. 2010

Trans. Mat. Res. Soc. Japan

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The Fe-incorporated carbon nanofibers (Fe-CNFs) grew on the graphite plate surface irradiated by Ar + ions with a simultaneous Fe supply. The average diameter and length of the Fe-CNFs were in the range of 10-50 nm and 0.5-3 µm, respectively. As confirmed by TEM observation, the Fe-CNFs thus grown were characterized by amorphous-like or very fine crystalline nature. Compared with bulk Fe, they possessed higher coercivities for both parallel and perpendicular directions to the substrate at room temperature. In addition, magnetic properties of the Fe-CNFs strongly depended on the Fe content: The higher the Fe content, the stronger the saturation magnetization, whereas perpendicular coercivity was obtained for lower Fe supply rates.

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Nickel nanowires of 4 nm diameter in the cavity of carbon nanotubes

Cited by 121 publications

References 21 publications

Carbon nanotubes prepared by anodic aluminum oxide template method

Carbon nanotubes prepared by anodic aluminum oxide template method

Complex‐Surfactant‐Assisted Hydrothermal Route to Ferromagnetic Nickel Nanobelts

Synthesis and Magnetic Properties of Fe-incorporated Carbon Nanofibers by Ion-irradiation Method

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