Template synthesis of water-dispersible and magnetically responsive carbon nano test tubes

Orikasa, Hironori; Inokuma, Nobuhiro; Ittisanronnachai, Somlak; Wang, Xiaohui; Kitakami, Osamu; Kyotani, Takashi

doi:10.1039/b800475g

Cited by 31 publications

(20 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 2c shows the XRD pattern of copper phyllosilicates after calcination. 26 , chemical vapour deposition 27,28 and electrochemical template synthesis 29 . On the basis of the reported synthesis procedure 27,30 , we proposed a twostep IWI method (see Methods and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

A copper-phyllosilicate core-sheath nanoreactor for carbon–oxygen hydrogenolysis reactions

et al. 2013

View full text Add to dashboard Cite

Hydrogenolysis of carbon-oxygen bonds is a versatile synthetic tool in organic synthesis. Copper-based catalysts have been intensively explored as the copper sites account for the highly selective hydrogenation of carbon-oxygen bonds. However, the inherent drawback of conventional copper-based catalysts is the deactivation by metal-particle growth and unstable surface Cu 0 and Cu þ active species in the strongly reducing hydrogen and oxidizing carbon-oxygen atmosphere. Here we report the superior reactivity of a core (copper)-sheath (copper phyllosilicate) nanoreactor for carbon-oxygen hydrogenolysis of dimethyl oxalate with high efficiency (an ethanol yield of 91%) and steady performance (4300 h at 553 K). This nanoreactor, which possesses balanced and stable Cu 0 and Cu þ active species, confinement effects, an intrinsically high surface area of Cu 0 and Cu þ and a unique tunable tubular morphology, has potential applications in high-temperature hydrogenation reactions.

show abstract

Section: Resultsmentioning

confidence: 99%

A copper-phyllosilicate core-sheath nanoreactor for carbon–oxygen hydrogenolysis reactions

et al. 2013

View full text Add to dashboard Cite

show abstract

“…At the same time, magnetic metal or alloy filled in the cavity of CNTs is responsive to magnetic field even after a long-term storage in water. Furthermore, the metal-filled CNTs can be water dispersible after a H 2 O 2 treatment [128].…”

Section: Electrodepositionmentioning

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%

“…When an electric field is applied, metal ions in the electrolyte solution migrate and are deposited onto an electrode by passing a current through an electrochemical cell. Therefore, metals can be filled into the cavity of AAOCNTs by using the electrodeposition method under a direct current [41,128,129] or alternating current [106]. In general, a layer of Au is first deposited on the surface of a both-side open AAO film using ion sputtering technique.…”

Section: Electrodepositionmentioning

confidence: 99%

See 1 more Smart Citation

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

View full text Add to dashboard Cite

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.

show abstract

“…17,18 Because of these unique characteristics, CNTs synthesized by the AAO template method (AAO-CNTs) are considered to be a promising candidate for systematically investigating the confinement effects of CNTs on the nanostructures loaded inside them. There are a few reports on controlling the length and diameter of AAO-CNTs, 19,20 however, the CNTs used usually have diameters larger than 10 nm. Since the smaller the CNT diameter, the more obvious the confinement effect, it is important to obtain CNTs with even smaller diameters.…”

Section: Introductionmentioning

confidence: 99%

Template synthesis of ultra-thin and short carbon nanotubes with two open ends

Hou

Shi

et al. 2012

J. Mater. Chem.

View full text Add to dashboard Cite

Anodic aluminium oxide (AAO) films containing small diameter channels with both ends open were prepared for use as a growth template for carbon nanotubes (CNTs). The smallest channel diameter was 7 nm and the smallest film thickness was 2 mm. The CNTs produced from the AAO template by chemical vapor deposition of acetylene had controllable outer and inner diameters and length, and open ends. The pore texture, structure and crystallinity of the CNTs were characterized by electron microscopy, nitrogen gas adsorption-desorption, and thermogravimetric analysis. The inner diameters of the CNTs were adjustable by selecting AAO templates with specific channel diameters and/or tuning the duration of chemical vapor deposition. CNTs with an outer diameter, inner diameter and length of 7 nm, 4.5 nm and 2 mm, respectively, were obtained, the narrowest and shortest ever reported for CNTs with two open ends. These thin, short, and open CNTs would render easy access, filling and transport of foreign matter into their one-dimensional cavity with prominent confinement effects.

show abstract

Template synthesis of water-dispersible and magnetically responsive carbon nano test tubes

Abstract: Water-dispersible and magneto-responsive carbon nano test tubes with a controlled length (1.3 microm) and diameter (35 nm) were synthesized by using the nanochannels of anodic aluminium oxide as a template.

Cited by 31 publications

References 7 publications

A copper-phyllosilicate core-sheath nanoreactor for carbon–oxygen hydrogenolysis reactions

A copper-phyllosilicate core-sheath nanoreactor for carbon–oxygen hydrogenolysis reactions

Carbon nanotubes prepared by anodic aluminum oxide template method

Template synthesis of ultra-thin and short carbon nanotubes with two open ends

Contact Info

Product

Resources

About