Investigation on Commercial NH3 Sensing Ink Modified by SnO2-Au-PANI Composite Material and Its Properties
By dispensing printing technology,this paper prepared an ammonia ( NH3 ) sensor on a cotton substrate with interdigitated electrode using commercial ink ( kz-sense-103 ) and investigated the impact of interfinger elec-trode spacing and number of interdigital pairs on sensor performance.The results indicate that the sensor with 6 in-terdigital pairs and 1 mm electrode spacing exhibited the strongest response to NH3 .Additionally,a SnO2-Au-PA-NI compound was prepared to enhance the performance of the commercial ink for NH3 sensing through a mixed method.The modified ink demonstrated a significantly improved response to NH3 compared to the commercial ink,with a real detection limit of 5 × 10 -6 .The NH3 sensor prepared with the modified ink shows excellent stability for the changes of temperature and humidity,and can distinguish NH3 from H2 ,CO,SO2 and NH3 .These findings suggest that the modified sensing ink is suitable for monitoring NH3 in daily and industrial environments.