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A highly sensitive NO2 gas sensor based on CeO2-doped ZnO heterojunction nanofibers
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DOI：10.1142/S0217984926400038.png)
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Abstract
En 中文
This experiment demonstrates the efficient synthesis of a CeO2-doped ZnO n-type heterojunction structure via sol-gel and electrospinning, resulting in a site-activated morphology with unique characteristics. The successful doping of CeO2 into the crystal structure of ZnO enhances the sensitivity to the target gas, due to the presence of large amounts of surface oxygen vacancies (V-o). The results showed that the 0.6 mol% CeO2-doped ZnO nanofibers (NFs) sample achieved optimal performance, with high response, good repeatability, and excellent selectivity. The 0.6 mol% CeO2-doped ZnO n-type heterojunction sensor has excellent sensitivity (158%) and selectivity to NO2 gas than that of the pure ZnO NFs sensor (28%) at 300(degrees)C under 1 ppm NO2 environment. The sensor still responds 18% even at an extremely low concentration of NO2 gas (0.2 ppm). Furthermore, the results clearly demonstrate that CeO2 incorporation significantly enhances the sensor's selectivity toward NO2, even in the presence of other interfering gases. The sensor exhibits good selectivity, repeatability, and long-term stability. These remarkable sensing properties indicate that the CeO2-doped ZnO n-type heterojunction structure has promising applications in detecting NO2 from human living environments.
Keywords:
Selectivity
electrospinning
heterojunction
ZnO
CeO2
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