Nanocrystalline Cu-doped Zirconia Film-coated Long-period Fiber Grating for CO Monitoring at High Temperature


Dense nanocrystalline copper-doped zirconia (CDZ, Cu:Zr=16:84) thin film was coated on the surface of a 125 µm-diameter long-period fiber grating (LPFG) by a facile synthesis route involving polymeric precursor coating and subsequent thermal treatments. The CDZ film had a uniform thickness of ~100 nm and grain size of 20 to 35 nm after a brief annealing step at 700°C for 1 hour. This CDZ thin film coated LPFG (CDZ-LPFG) was evaluated at a high temperature of 550°C for its change of resonant wavelength (R) in response to the variation of carbon monoxide (CO) concentration in nitrogen (N2). The R was found to shift toward longer wavelength when increasing the CO concentration. The CDZ-LPFG sensor response was found to be reproducible and reversible at low level CO concentrations (<1,000 ppm) but became irreversible when the CO concentration was high (e.g. at 10,000 ppm). The high temperature stability of the CDZ material in CO-containing atmospheres was studied to understand the limit of CO measurement range.


Electrical and Computer Engineering

Keywords and Phrases

Copper-Doped Zirconia; Nanocrystalline; Carbon monoxide; Thin films

Document Type

Article - Conference proceedings

Document Version


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© 2009 SPIE, All rights reserved.

Publication Date

01 Apr 2009