Highly sensitive moisture sensor with a hydrogel film coated on surface-textured stainless steel
2019
Abstract We here propose a highly-sensitive, simple moisture sensor based on
surface plasmon resonance. The moisture sensor was constructed by coating a hydrogel film onto a stainless steel (STS) plate having a one-dimensional surface texture with a pitch of 500 nm. The
refractive indexof the hydrogel film was modulated upon exposure to moisture, shifting the plasmonic resonance peak of the textured STS surface. The effective
refractive indexand water content of the film were deduced from the spectral shift of the resonance peak. The resonance position shifted from 748 to 720 nm as the water volume percentage increased from 48.8 to 86.6 vol%, corresponding to a moisture sensitivity of 0.74 nm per 1 vol%. The
refractive-indexsensitivity of the sensor was measured to be 593 nm/RIU, where RIU is
refractive indexunit.
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