Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 304, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.127347
Keywords
CuO-NiO nanotubes; Heterojunctions; Oxygen vacancy; Glycol; Gas sensors
Funding
- National Natural Science Foundation of China [61671299, 61971284, 61774102]
- Center of Hydrogen Science at SJTU
- Startup Fund for Youngman Research at SJTU
- Natural Science Foundation of Shaanxi Province Grant [2019JQ-291]
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The rapid development of p-type metal oxide semiconductors-based gas sensors for detecting glycol has recently attracted extensive attentions due to its huge hazard to human health. However, the poor sensitivity of the p-type gas sensor constraints its further application. In this work, novel p-p heterojunction CuO-NiO nanotubes have been controllably synthesized for high performance glycol gas sensors through one-pot synthesis approach combined with certain calcination treatment. In order to optimize element ratio of Cu to Ni for high performance gas sensors, the feeding ratio of Cu2+/Ni2+ in the synthesis process has been systematically studied. As a consequence, the gas sensor based on optimal hybrid nanotubes (CuO-NiO(13:7)) shows the highest sensitivity toward 100 ppm glycol at 110 degrees C with response/recovery time of 15 and 45 s. This hybrid sensor also shows excellent repeatability and long-term stability. The enhanced sensing properties to glycol are mainly attributed to the synergistic effects of CuO-NiO heterostructure and massively produced oxygen vacancies under the optimized element ratio of Cu to Ni. This work demonstrates the novel heterostructured CuO-NiO nanotubes have great potential for high performance gas sensor.
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