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This study described relative humidity (RH) sensing using a graphene/128° YX LiNbO 3 surface acoustic wave (SAW) device. The resonant frequency of the device decreased in a two-stage manner as the RH increased. For a low RH range (RH<50%), a frequency downshift of 1.38kHz per 1% RH change was observed. This was attributed to mass loading of the SAW propagation surface due to the adsorption...
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