Nanomaterials: A Membrane-Based Synthetic Approach

Martin, Charles R.

doi:10.1126/science.266.5193.1961

Cited by 4,037 publications

(2,615 citation statements)

References 56 publications

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“…Ion-track lithography technology is well known as a low-cost process to form deep vertical and high aspect ratio channels for nanowire growth. 26 In considering nanowire growth in templates for thermoelectric applications, the contribution of the host materials must be considered. Here we choose polyimide-based Kapton as a template for electroplating Bi 0.5 Sb 1.5 Te 3 nanowires.…”

Section: Introductionmentioning

confidence: 99%

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

Koukharenko

Nandhakumar

et al. 2009

Phys. Chem. Chem. Phys.

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High density p-type Bi 0.5 Sb 1.5 Te 3 nanowire arrays are produced by a combination of electrodeposition and ion-track lithography technology. Initially, the electrodeposition of p-type Bi 0.5 Sb 1.5 Te 3 films is investigated to find out the optimal conditions for the deposition of nanowires. Polyimide-based Kapton foils are chosen as a polymer for ion track irradiation and nanotemplating Bi 0.5 Sb 1.5 Te 3 nanowires. The obtained nanowires have average diameters of 80 nm and lengths of 20 mm, which are equivalent to the pore size and thickness of Kapton foils. The nanowires exhibit a preferential orientation along the {110} plane with a composition of 11.26 at.% Bi, 26.23 at.% Sb, and 62.51 at.% Te. Temperature dependence studies of the electrical resistance show the semiconducting nature of the nanowires with a negative temperature coefficient of resistance and band gap energy of 0.089 AE 0.006 eV.

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Section: Introductionmentioning

confidence: 99%

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

Koukharenko

Nandhakumar

et al. 2009

Phys. Chem. Chem. Phys.

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“…6 MnO 2 is one of the most popular electrochemical energy storage materials because of its high energy density, low cost, environmental friendliness, and natural abundance, 7 but it has poor conductivity. 4c PEDOT has merits of excellent conductivity, high stability, and mechanical flexibility, 8 but it provides low electrochemical energy density.…”

mentioning

confidence: 99%

MnO₂/Poly(3,4-ethylenedioxythiophene) Coaxial Nanowires by One-Step Coelectrodeposition for Electrochemical Energy Storage

2008

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One-dimensional (1D) nanostructured materials have been intensively investigated as building components in electrochemical energy storage 1 and solar energy conversion 2 devices because they provide short diffusion path lengths to ions and excitons, leading to high charge/discharge rates 1 and high solar energy conversion efficiency. 2 More recently, coaxial nanowires have attracted greater attention in this field due to their added synergic properties (e.g., high conductivity) 3a or functionalities (e.g., core/shell p-n junction) 3b,c arising from the combination of different materials. 3 Various materials such as semiconductor/semiconductor, metal/ metal oxide, and metal oxide/metal oxide, have been employed as core/shell in coaxial nanowires. 3 However, there have been few studies on the coaxial nanowires with transition metal oxide and conductive polymer, although both of them are important electroactive materials used in electrochemical energy storage. 4 The combination of these two materials at 1D nanostructures may exhibit excellent electrical, electrochemical, and mechanical properties for electrochemical energy storage. To date, only a few reports have been published on the synthesis of metal oxide/ conductive polymer with core/shell structures. 5 In all of these reports, a stepwise synthetic approach was adopted: metal oxide nanoparticles, 5a nanostrands, 5b or nanotubes 5c were first synthesized and subsequently coated chemically by conductive polymers as shells.In this paper, we introduce a simple one-step method to synthesize MnO 2 /poly(3,4-ethylenedioxythiophene) (PEDOT) coaxial nanowires by coelectrodeposition in a porous alumina template. 6 MnO 2 is one of the most popular electrochemical energy storage materials because of its high energy density, low cost, environmental friendliness, and natural abundance, 7 but it has poor conductivity. 4c PEDOT has merits of excellent conductivity, high stability, and mechanical flexibility, 8 but it provides low electrochemical energy density. Electrodeposition is used here because it is a simple yet versatile method in controlling structures and their composition by tuning applied potentials and electrolyte ingredients. 9 In this report, MnO 2 /PEDOT coaxial nanowires are found to be promising electrochemical energy storage materials. The core MnO 2 provides high energy storage capacity, while the highly conductive, porous, and flexible PEDOT shell facilitates the electron transport and ion diffusion into the core MnO 2 and protects it from structurally significant collapsing and breaking. These combined properties enable the coaxial nanowires to have very high specific capacitances at high current densities.Scheme 1 illustrates the growth of MnO 2 /PEDOT coaxial nanowires. Under a constant potential (typically 0.75 V vs Ag/ AgCl), Mn 2+ (10 mM manganese acetate) is converted to its higher oxidization state, which can readily undergo hydrolysis to yield MnO 2 . 7 Simultaneously, EDOT monomer (80 mM) is electropolymerized into PEDOT in the pores of t...

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“…Although the majority of early work focused on CNTs, several new techniques have been recently described which can produce nanotubes from a variety of other materials, including synthetic polymers, DNA, proteins, lipids, silicon, and glass (Martin 1994;Greiner et al 2006;Tsai et al 2006;Yuwono and Hartgerink 2007). These techniques include templating of nanotubes on porous templates, such as alumina or silica (Fig.…”

Section: Nanomaterials Scaffolds For Neuroregenerationmentioning

confidence: 99%

Novel Nanomaterials for Clinical Neuroscience

Gilmore

Xiang

Quan

et al. 2008

J Neuroimmune Pharmacol

213

123

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Neurodegenerative disorders including Alzheimer's and Parkinson's diseases, amyotrophic lateral sclerosis, and stroke are rapidly increasing as population ages. The field of nanomedicine is rapidly expanding and promises revolutionary advances to the diagnosis and treatment of devastating human diseases. This paper provides an overview of novel nanomaterials that have potential to improve diagnosis and therapy of neurodegenerative disorders. Examples include liposomes, nanoparticles, polymeric micelles, block ionomer complexes, nanogels, and dendrimers that have been tested clinically or in experimental models for delivery of drugs, genes, and imaging agents. More recently discovered nanotubes and nanofibers are evaluated as promising scaffolds for neuroregeneration. Novel experimental neuroprotective strategies also include nanomaterials, such as fullerenes, which have antioxidant properties to eliminate reactive oxygen species in the brain to mitigate oxidative stress. Novel technologies to enable these materials to cross the blood brain barrier will allow efficient systemic delivery of therapeutic and diagnostic agents to the brain. Furthermore, by combining such nanomaterials with cell-based delivery strategies, the outcomes of neurodegenerative disorders can be greatly improved.

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Nanomaterials: A Membrane-Based Synthetic Approach

Cited by 4,037 publications

References 56 publications

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

MnO₂/Poly(3,4-ethylenedioxythiophene) Coaxial Nanowires by One-Step Coelectrodeposition for Electrochemical Energy Storage

Novel Nanomaterials for Clinical Neuroscience

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Nanomaterials: A Membrane-Based Synthetic Approach

Cited by 4,037 publications

References 56 publications

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

High density p-type Bi0.5Sb1.5Te3 nanowires by electrochemical templating through ion-track lithography

MnO2/Poly(3,4-ethylenedioxythiophene) Coaxial Nanowires by One-Step Coelectrodeposition for Electrochemical Energy Storage

Novel Nanomaterials for Clinical Neuroscience

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Product

Resources

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MnO₂/Poly(3,4-ethylenedioxythiophene) Coaxial Nanowires by One-Step Coelectrodeposition for Electrochemical Energy Storage