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Synthesis and Sensing Application of LiFe0.99Ag0.01PO4 in Formaldehyde Gas Detection

[ Vol. 8 , Issue. 4 ]

Author(s):

Patima Nizamidin, Abliz Yimit and Ji De Wang   Pages 557 - 561 ( 5 )

Abstract:


Silver doped LiFePO4 powder was synthesized using the hydrothermal method, and was used as a sensing material. An Optical WaveGuide (OWG) sensor which reacted to Volatile Organic Compound (VOC) was developed by spin-coating a thin film of LiFe0.99Ag0.01PO4 onto a Tin-diffused glass optical waveguide. This OWG sensor was used to detect formaldehyde gas as a typical example of VOCs. The experimental result showed that the sensor easily and repeatedly detected 100ppt of formaldehyde, with a short response time (less than 2 s). At the low concentration (below 10ppm), the volatile organic compounds caused no interference with the detection of formaldehyde vapor. The sensor also had the characteristics of high sensitivity, a simple structure, and easy fabrication.

Keywords:

Formaldehyde, Gas detection, LiFe0.99Ag0.01PO4 thin film, Optical waveguide gas sensor, Output light intensity, Refractive index, Thickness, Transmittance

Affiliation:

College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, P.R. China.



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