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300 DPI Image
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| Title: |
Metal-oxide nanotubes schematic |
| Description: |
A schematic diagram (not to scale) of the preparation and application of a nanotube gas sensor based on tungsten oxide deposited on a substrate of nanoporous aluminum oxide. Perforated with millions of nanoscale holes, the aluminum oxide sheet served as a template or mold for the creation of the nanotubes. Researchers dipped the sheet in a solution of tungsten ions, allowed the sheet to dry, and sintered (a baking process characterized by incremental temperature increases used to ensure that a coating will stick) it four times, building up a thin film of tungsten oxide on the walls of the pores. Nanotubes are an excellent structure for gas sensing applications because of their high surface-to-volume ratio. The NIST team estimates that devices based on their technique will be 100 to 1,000 times more sensitive than comparable film-based sensors and may be suitable for studying biological cell stress and cell communication.
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| Subjects (names): |
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| Topics/Categories: |
Chemical Analysis
Nanotechnology--Materials
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| Type: |
Graphic/illustration |
| Source: |
National Institute of Standards and Technology |
Credit Line as it should
appear in print: |
NIST |
| AV Number: |
009CSTL002 |
| Date Created: |
January 2009 |
| Date Entered: |
1/13/2009 |
