Optical Waveguide BTX Gas Sensor Based on Yttrium-Doped Lithium Iron Phosphate Thin Film

<table>Typical responses of LiFe<sub>0.99</sub>Y<sub>0.01</sub>PO<sub>4</sub> film/Tin-diffused glass OWG sensor, when it is exposed to xylene gas in air.</table>

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Figure 7

Figure 7: Optical Waveguide BTX Gas Sensor Based on Yttrium-Doped Lithium Iron Phosphate Thin Film 