Abstract
Produced in the process of meat spoilage, ammonia (NH3) is believed to be an important gas, as its concentration is a major indicator for evaluating freshness. A flexible NH3 sensor, based on novel polyaniline/Zn-porphyrin (PANI/Zn-tpps4) composite, was designed via a one-step electrodeposition method where a strong π-π conjugated system formed through the combination of the quinone ring of the PANI molecular chain and sulfate radical of the Zn-tpps4 molecule. The new sensor PANI/Zn-tpps4 film possesses outstanding sensing characteristics in terms of response value,enabling it to perform better than pure PANI film. To further explore the performance of PANI/Zn-tpps4 film, the gas-sensing properties, humidity and endurance tests were fully evaluated at low NH3 concentration. It was concluded that the sensing performance was dramatically improved, because the Zn-tpps4,acting as a “bridge”, facilitated the transfer of electrons from NH3 molecules to PANI molecular chains. It is expected that the PANI/Zn-tpps4 sensor can be attached to deformable packaging membrane to form an ideal device as meat freshness indicator.
| Original language | English |
|---|---|
| Article number | 128476 |
| Number of pages | 9 |
| Journal | Sensors and Actuators B: Chemical |
| Volume | 321 |
| Early online date | 20 Jun 2020 |
| DOIs | |
| Publication status | Published - 15 Oct 2020 |
| Externally published | Yes |
Bibliographical note
The authors are grateful for the financial support of this work by NSAF (Grant Nos. 51776143 and U1830127 ), the Fundamental Research Funds for Central Universities (Grant No. 2042018kf0238 ). The use of SEM, XPS, TEM and AFM funded by the Open Subsidies for large-scale Equipment of Wuhan University (Grant No. LF20181061 ).Keywords
- Flexible electronic device
- Freshness indicator
- NH3 sensor
- Polyaniline
- Zn-tpps4