Highly-sensitive ethanol gas sensor based on poly dimethylsiloxane coated micro-nano fiber

Polydimethylsiloxane (PDMS) was coated on the surface of a non-adiabatic micro-nano fiber, and highly-sensitive ethanol gas concentration measurement was realized based on in-line Mach-Zehnder interference. When the concentration of ethanol gas changes, the PDMS will swell due to the adsorption characteristic of the PDMS film to ethanol gas, so that the interference wavelength of the micro-nano fiber mode changes. By monitoring the shift of the resonance wavelength, the concentration of the ethanol gas can be obtained. Experimental results of the ethanol gas sensor in the concentration range of 0-140ppm show that the sensitivity of the sensor can reach 86.97pm/ppm.