▎ 摘　　要

NOVELTY - Present invention is related to a composite for detecting ammonia gas and application thereof. The composite comprises a graphene nano ribbon 0.1~49.9 wt%, a nano metallic oxide 0.1~49.9 wt% and a conductive polymer 50~99 wt%. The composite is in a core-shell structure with firstly covering the graphene nano ribbon with the nano metallic oxide and further covering the afore-structure with the polymer. When the present invention is produced as a detector, it is able to quickly and sensitively detect the presence of ammonia gas which is very suitable for applied to clinical use. Clinicians can fast screen patients for diabetes or similar urinary problems by simply asking them breathe to the detector. The present invention provides a painless, rapid and non-invasive screening method for diabetes or similar urinary problems.