期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 7, 页码 8411-8421出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b19971
关键词
p-p heterojunction sensors; Cu3Mo2O9 micro/nanorods vertically grown on p-CuO layers; nitrogen dioxide; Schottky barrier; superior room-temperature performance
资金
- project Exploration of High Performance Nanosensors for Rapid Detection and Application Demonstration of the National Key Research and Development Program of China Fundamental Research on Nano Sensing Materials and High Performance Sensors Focused on Po [2017YEA0207104]
- Beijing Nova Program of Science and Technology [Z191100001119138]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09040101]
- Youth Innovation Promotion Association CAS [2015030]
- CAS Key Technology Talent Program [Y8482911ZX, Y7602921ZX]
High sensitivity, low limit of detection (LOD), and short response and recovery times at room temperature (RT) are critical for gas sensors. For NO2, different binary metal oxide-based sensors were developed to achieve superior performance at elevated temperatures instead of RT. Herein, we report on CuO@CuO and Cu3Mo2O9@CuO sensors with CuO and Cu3Mo2O9 micro/nanorods vertically aligned on the CuO layers, which were directly fabricated using a facile, low-cost, and catalyst-free chemical vapor deposition (CVD) technique. Their sensing performance tests revealed that the Cu3Mo2O9@CuO p-p heterojunction sensors exhibited a high response of 160% to 5 ppm NO2, an excellent sensitivity of 50% ppm(-1), a low LOD of 2.30 ppb, a short response time of 49 s, and a rapid recovery of 241 s at RT, obviously better than those for CuO@CuO sensors. The superior performance of Cu3Mo2O9@CuO sensors could be attributed to the Schottky heterojunction formed between p-Cu3Mo2O9 micro/nanorods and p-CuO films, the catalytic effect, and the anisotropic nature of Cu3Mo2O9 micro/nanorods. This study not only provides a simple, low-cost, and batchable fabrication method of homo/heterojunction sensors with micro/nanorods vertically aligned on films but also opens an avenue for sensor design by tuning the Schottky barrier height to enhance RT performance.
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