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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.
Subjects (names):
Topics/Categories: Chemical Analysis
Nanotechnology--Materials
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

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