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Temperature-dependence adsorption and reaction of vapor molecules on miniaturized tin oxide sensors


EMSL Project ID
6702

Abstract

In the past two years, we have being working on the fabrication of miniaturized tin oxide chemical sensor using dip pen nanolithography (see attached). Such sensors can detect gas phase molecules with shorter response and response time, and could form the basis for electronic nose to recognize different kind of gaseous species, providing differently doped tin oxide elements are patterned on the same substrates. Now we are in the stage of optimizing the sensor process: the effect of dopant and temperature are studying. Preliminary results indicate a strong temperature dependent sensitivity change for acetic acid. Further study needs to show the influence of adsorption at different temperature, which can be studied ideally by temperature programmed desorption (TPD). I have done some work before concerning the TPD and understand the adsorption of different gas on zeolite, thus should be able to work seamless with the cooperators in the facility.

Project Details

Project type
Exploratory Research
Start Date
2004-02-10
End Date
2005-02-22
Status
Closed

Team

Principal Investigator

Ming Su
Institution
Northwestern University