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An ammonia gas sensor which has a high sensitivity in robust conditions has been investigated. A nanoporous thin film consisting of polyelectrolytes and sheet particulate α-ZrP was assembled by a layer-by-layer self assembly method on the electrode of a quartz crystal microbalance (QCM). This QCM sensor showed an eight times higher sensitivity than that of QCM deposited with α-ZrP by a casting method in low relative humidity. This means that the polyelectrolytes worked not only as a stabilizer to form a porous structure, but also as a material to keep moisture. Consequently, we considered that the gas sensitivity of the thin film is increased for other hydrophilic gases.