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Poly(p-diethynylbenzene) (PDEB) with improved solubility was synthesized using anovel catalyst bis(triphenylphosphine)bis(p-diethnylbenzene) nickel complex (Ni-C). A surfaceacoustic wave (SAW) delay line oscillator was covered by Langmuir-Blodgett (LB) films of re-sulting PDEB to prepare a humidity sensor, which was found to have high sensitivity and goodrepeatability. PDEB shows promise as a good humidity-sensitive material.