Carbon Nanotubes Field Emission Diode: Nanoelectronic Device

Product Description
A fully integrated field emission diode (FED) using carbon nanotubes as electron field emitter was constructed. The device was designed and fabricated on a glass substrate by screen-printing thick film technique. The FED was operated at 100 V for giving a forward current density of 180 mA/cm2. A leakage current of 1 pA was measured then a 1000 V reverse voltage was applied, indicating that a high voltage blocking capability was obtained from such a device. From theoretical calculation and experimental results, the FED can be operated in megahertz due to very high speed of electrons traveling through them vacuum gap on forward operation and a small residue capacitance as well as minimum the reverse recovery time on reverse operation. The high performance of the novel FED was fabricated by a cost effective process combined with nanomaterials which opens up a route to produce miniaturized vacuum devices and new applications for such kind of the integrated vacuum microelectronic device.

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Carbon Nanotubes: Angels Or Demons?

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The field of C-nanoparticles toxicity is, at present, fragmented and contradictory, oscillating between enthusiastic raptures and bitter disappointments. This important book presents an overall, unitary view of the carbon nanoparticle world, in which both the positive and negative aspects of these recently discovered nanomaterials are critically described and elucidated.

The book provides an exhaustive account of C-nanotubes toxicity, mechanisms of toxicity and biocompatibility towards human and animal organisms as well as the entire biological environment. The detailed description of the physicochemical properties of these nano-objects will help facilitate discussion on their future applications in the biomedical field.

This book is unique in its understanding, interpretation and analysis of the mechanisms related to the physicochemical behavior of C-nanotubes, as it aims is to let readers be in contact with C-nanoparticles in order for them to take the many advantages these nanostructures can offer in the aforesaid field. Contributors include experts in the study of materials biocompatibility and toxicity, mainly as it concerns Carbon-nanoparticles toxicity.

Contents: Carbon Nanotubes: A Basic Description (C Goze-Bac); Applications in Mechanics and Sensors (A Rubio); Applications in Biology and Medicine (G Rasi & C Matteucci); Carbon Nanotubes: Applications for Medical Devices (R Streicher); Toxicity of Carbon-Nanotubes (S Fiorito); Mechanisms of Toxicity of Carbon Nanotubes (S Fiorito & A Serafino).

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Carbon nanotubes paste electrodes as new detectors for capillary electrophoresis

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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Carbon nanotubes paste electrodes (CNTPE) prepared with short (1-5@mm length) and long carbon nanotubes (5-20@mm length) of 20-50nm diameter have demonstrated to be highly useful as detectors in flow injection analysis and capillary electrophoresis. Compared to the classical graphite paste electrode, CNTPE improved the detection limits of dopac, ascorbic acid, dopamine, norepinephrine and epinephrine. The content of agglutinant has shown to be an important variable in the preparation of these carbon nanotubes composites. Even when no substantial differences were observed between the electrodes, those prepared with long carbon nanotubes (55.0%, w/w) and mineral oil (45.0%, w/w) have allowed us to obtain less noisy and more reproducible signals. In this article we also report the successful use of a new electrochemical cell for the detection in capillary electrophoresis that allows an easier handling and more reproducible responses. Therefore, the combination of the carbon nanotubes electrocatalytic activity with the known advantages of composite materials, the efficiency of the new electrochemical cell and the excellent separative properties of capillary electrophoresis represents a very important alternative for new electroanalytical challenges.

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Determination of trace thiocyanate with nano-silver coated multi-walled carbon nanotubes modified glassy carbon electrode

Product Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Novel nano-silver coated multi-walled carbon nanotube composites were prepared and used to fabricate a modified electrode. The application of the nano-silver coated multi-walled carbon nanotube composites modified electrode for determination of trace thiocyanate is demonstrated for the first time. The influence of substrate, pH and interference of coexisting substances was investigated for response properties of the electrode. There was a linear relationship at the range 2.5×10^-^9 to 5×10^-^8molL^-^1 and 5×10^-^8 to 1×10^-^6molL^-^1 of thiocyanate with the decrement of anodic DPV peak currents. The limit of detection was 1×10^-^9molL^-^1(S/N=3). The constructed electrode showed excellent reproducibility and stability. Actual urine and saliva samples of smoker and non-smoker were analyzed and satisfactory results were obtained. This method provides a new way to construct any electrode for biological and environmental analysis.

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Application of carbon nanotube-matrix assistant native polyacrylamide gel electrophoresis to the separation of apolipoprotein A-I and complement C3

Product Description
This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
The application of carbon nanotube polyacrylamide gel electrophoresis (PAGE) is being reported so as to improve selectivity of analysis. A novel polyacrylamide gel was manufactured by adding multi-walled carbon nanotubes (MWNT) when producing the polyacrylamide gel. Carbon nanotube-matrix assistance was used to separate apolipoprotein A-I and complement C3 with native polyacrylamide gel electrophoresis. Significant improvement of the relative selectivity was achieved in the separation between apolipoprotein A-I and complement C3, because of the hydrophobic change of the carbon nanotube surface non-covalently functionalized by the surfactant Triton X-100. These two proteins were identified by MS/MS after electrophoresis. The change of the observed mobility can also be noticed using other nanomaterials such as nano-TiO”2 and nano-Al”2O”3″, but no significant improvement of relative selectivities could be observed with the latter nanoparticles.

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