▎ 摘　　要

An innovative Ge15Sb20Se65 glass tapered fiber sensor functionalized by graphene oxide (GO) doped with plat-inum nanoparticles (Pt) for ethanol monitoring is proposed. As the tapered fiber region is immersed into ethanol solution, molecules of ethanol will be enriched in the Pt/GO coating. Sensing mechanism is based on the vari-ation of refractive index caused by charge transfer, enhancing the evanescent field intensity of tapered fiber surface react with ethanol molecule. The results of experiment indicate that an increment of coating time can elevate sensing sensitivity. Moreover, the existence of platinum (Pt) nanoparticles as photocatalyst can facilitate the electron transfer from the molecule into the GO layer, promoting the infrared (IR) absorption of the mole-cules of ethanol. The sensing sensitivity of tapered fiber evanescent wave sensor modified by Pt/GO to monitor ethanol is increased significantly to 2.45E-3 a.u./%, which is 2.43 times of GO-coated sensor, and 7 times of uncoated sensor. Further, the sensing properties of tapered fiber evanescent wave sensor deposited with Pt/GO and GO were numerically simulated.