▎ 摘　　要

NOVELTY - The method involves dissolving ammonium molybdate and thiourea in deionized water and performing ultrasonic stirring to obtain a uniform mixed solution, where the mass ratio of ammonium molybdate, thiourea and deionized water is 1:1.8-2:30-35. The molybdenum disulfide (41) is collected, and the collected molybdenum disulfide is dried in a vacuum drying oven to obtain molybdenum disulfide nanoflower powder. The composite dispersion liquid of molybdenum disulfide, graphene oxide (42) and fullerol (43) is applied to the second electrode surface of the quartz crystal microbalance (QCM) substrate. A QCM substrate coated with a composite film (4) of molybdenum disulfide, graphene oxide and fullerol is obtained. The humidity is measured by the resonant frequency change of the QCM substrate coated with the composite thin film composed of molybdenum disulfide, graphene oxide and fullerol. The first electrode (2) and the second electrode (3) are gold or silver. USE - Kind of preparation method of fast quartz crystal microbalance (QCM) humidity sensor used for respiratory monitoring. Uses include but are not limited to industry, medical treatment, agriculture and human health. ADVANTAGE - The molybdenum disulfide, graphene oxide and fullerenol composite QCM humidity sensor has very fast response/recovery speed, high sensitivity, good repeatability, small humidity, stable performance, and is used for respiratory monitoring. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1. a kind of fast QCM humidity sensor; 2. an application of the humidity sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the preparation method of fast QCM humidity sensor. First electrode (2) Second electrode (3) Composite film (4) Molybdenum disulfide (41) Graphene oxide (42) Fullerol (43)