Journal
RSC ADVANCES
Volume 10, Issue 14, Pages 8332-8339Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra10054g
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Funding
- National Natural Science Foundation of China [11704168, 11404158, 11674144, 11634007, 51431004]
- Natural Science Foundation of Shandong Province [JQ201602, ZR2018MA038, ZR2019MA033, ZR2016AL09]
- Shandong Colleges Science and Technology Program [J16LJ04]
- National College Students' Innovation and Entrepreneurship Training Program [201810452004, 201810452056]
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2D heterostructures are promising gas sensor materials due to their surface/interface effects and hybrid properties. In this research, Cu2O/Fe2O3 heterostructure ordered arrays were synthesized using an in situ electrodeposition method for H2S detection at low temperatures. These arrays possess a periodic long range ordered structure with horizontal multi-heterointerfaces, leading to superior gas sensitivity for synergistic effects at the heterointerfaces. The sensor based on the Cu2O/Fe2O3 heterostructure ordered arrays exhibits a dramatic improvement in H2S detection at low temperatures (even as low as -15 degrees C). The response is particularly significant at room and human body temperatures since the conductivity of the arrays can change by up to three orders of magnitude in a 10 ppm H2S atmosphere. These good performances are also attributed to the formation of metallic Cu2S conducting channels. Our results imply that the Cu2O/Fe2O3 heterostructure ordered arrays are promising candidates for high-performance H2S gas sensors that function at low temperatures as well as breath analysis systems for disease diagnosis.
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