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WO3 nanoplates were synthesized by a hydrothermal method. Morphology and structure of the WO3 nanoplates were analyzed by SEM and XRD, respectively. Gas sensing properties of the as-prepared WO3 sensor were investigated by a static gas-sensing system. The results show that the WO3 nanoplates reveal good crystallinity with mean edge length of 200∼300 nm and wall thickness of about 50 nm. The optimal...