Penetrating the Oxide Barrier in Situ and Separating Freestanding Porous Anodic Alumina Films in One Step

Tian, Mingliang; Xu, Shengyong; Wang, Jinguo; Kumar, Nitesh; Wertz, E.; Li, Qi; Campbell, Paul M.; Chan, Moses H. W.; Mallouk, Thomas E.

doi:10.1021/nl0501112

Cited by 140 publications

(129 citation statements)

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“…As a result, AAOCNTs with outer diameters ranging from 20 to 200 nm can be easily prepared [46,47,[79][80][81]. AAO film with channel size smaller than 20 nm can also be synthesized by selecting low voltage or in dilute sulfuric acid at low temperature (near 0°C) [76,82]. SEM images of the AAO-CNTs with outer diameters of 100, 30, and 10 nm are shown in Figure 5.…”

Section: Synthesis Of Cnts By the Aao Template Methodsmentioning

confidence: 99%

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: Synthesis Of Cnts By the Aao Template Methodsmentioning

confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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“…Very recently, Mallouk and coworkers (20) proposed a new method to penetrate and detach the barrier layer by applying a reverse bias voltage (Ϫ3.5 to Ϫ5V) immediately after the completion of the anodization; both anodization and reverse bias are carried out in the same 3% H 2 SO 4 solution. When H 2 bubbles are observed, the bias voltage is reduced until no more bubbles are detected; the process takes a few minutes.…”

Section: 2)mentioning

confidence: 99%

“…When H 2 bubbles are observed, the bias voltage is reduced until no more bubbles are detected; the process takes a few minutes. It was postulated (20) that the application of a reverse bias voltage in acidic solution results in an increase of the local H ϩ concentration, thus promoting the dissolution of the oxide barrier layer by the following reaction:…”

Section: 2)mentioning

confidence: 99%

Template Deposition of Metals

Ugo

Moretto

2007

Handbook of Electrochemistry

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Template synthesis is a relatively simple and easy procedure which has made the fabrication of rather sophisticated nanomaterials accessible to almost any laboratory. Template synthesis requires access to instrumentation capable of metal sputtering and electrochemical deposition. The characterization of the fabricated nanostructures can be done using instrumental techniques including spectrophotometry, voltammetry, optical microscopy, atomic force microscopy, and electronic microscopies (scanning electron microscopy (SEM) and transmission electron microscopy (TEM)).The method is based on the simple but effective idea that the pores of a host material can be used as a template to direct the growth of new materials. Historically, template synthesis was introduced by Possin (1) and refined by Williams and Giordano (2) who prepared different metallic nanowires with widths as small as 10 nm within the pores of etched nuclear damaged tracks in mica. It was further developed by Martin's group (3-5) and followed by others (6) with the number of examples and applications (7) continually increasing. The nanoporous membranes usually employed as templates are alumina or track-etched polymeric membranes which are widely used as ultrafiltration membranes. Recently, metal nanostructures have also been obtained using the pores created by self-assembly in block copolymer structures under the influence of electric fields and high temperatures (8, 9).The first part of this section focuses on the main characteristics and fabrication techniques used for obtaining templating membranes and depositing metal nanostructures by suitable electroless and electrochemical procedures. Methods such as sol-gel (10-12) or chemical vapor deposition (10, 13), which have been used primarily for the template deposition of carbon, oxides, or semiconducting-based materials, will not be considered here in detail. The second part of the section focuses on the electrochemical properties of the fabricated nanomaterials with emphasis on the characteristics and applications of nanoelectrode ensembles (NEEs). Templating membranes 16.2.2

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“…Regardless of the irregularity of the arrays formed with the "branched" side of the AAO membrane and the polycarbonate membrane, these experiments suggest that this evaporation technique is capable of replicating templates of almost arbitrarily small dimensions, shape, and composition (including AAO membranes with regular, cylindrical pores as small as 20 nm, which are not commercially available but have been produced using established anodization methods). 3,[27][28][29][30][31] Control of the Heights of the Nanotubes. The heights of the structures depended on the angle of evaporation (␣, the angle between the axis of rotation and a line between the www.acsnano.org source and the AAO membrane).…”

Section: Resultsmentioning

confidence: 99%