Journal
NANOMATERIALS
Volume 10, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano10061162
Keywords
CuO; WO3; CuS formation; H2S; n-ptype; molar ratio; weakening mode
Categories
Funding
- national Key R&D Program of China [2016YFA0202200]
- National Natural Science Foundation of China [11574335, 11933006, 51772213, 21677095]
- Shanghai Science and Technology Committee (Quantum Information Technology)
- Frontier Science Research Project (Key Programs) of the Chinese Academy of Sciences [QYZDJ-SSW-SLH018]
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In this work, the compositional optimization in copper oxide/tungsten trioxide (CuO/WO3) composites was systematically studied for hydrogen sulfide (H2S) sensing. The response of CuO/WO(3)composites changes fromp-type ton-type as the CuO content decreases. Furthermore, thep-type response weakens while then-type response strengthens as the Cu/W molar ratio decreases from 1:0 to 1:10. The optimal Cu/W molar ratio is 1:10, at which the sensor presents the ultrahighn-type response of 1.19 x 10(5)to 20 ppm H2S gas at 40 degrees C. Once the temperature rises from 40 degrees C to 250 degrees C, the CuO/WO3(1:1) sensor presents thep-nresponse transformation, and the CuO/WO3(1:1.5) sensor changes from no response ton-type response, because the increased temperature facilitates the Cu-S bonds break and weakens thep-type CuO contribution to the total response, such that the CuS bond decomposition by a thermal effect was verified by a Raman analysis. In addition, with a decrease in CuO content, the CuO is transformed from partly to completely converting to CuS, causing the resistance of CuO to decrease from increasing and, hence, a weakening mode ofp-CuO andn-WO(3)to the total response turns to a synergistic mode to it.
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