Highly selective room temperature ammonia sensors based on ZnO nanostructures decorated with graphene quantum dots (GQDs)

•ZnO nanostructures combined with GQDs enhance the sensor response and selectivity toward ammonia at room temperature.•Sensor response enhancement depend on the GQDs’ amount.•Humidity hugely improve the sensor response toward ammonia.•COOH group creation is due to the bonding between the oxygen in t...

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