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The Bi₂O₃ nanowires are highly sensitive to low concentrations of NO₂ in ambient air and are almost insensitive to most other common gases. However, it still remains a challenge to enhance their sensing performance and detection limit. This study examined the influence of the encapsulation of β-Bi₂O₃ nanorods with In₂O₃ on the NO₂ gas sensing properties. β-Bi₂O₃-core/In₂O₃-shell nanorods were fabricated by a two-step process comprising the thermal evaporation of Bi₂O₃ powders and sputter-deposition of In₂O₃ . Multiple networked β-Bi₂O₃-core/In₂O₃-shell nanorod sensors showed the responses of 12-156% at 1-5 ppm NO₂ at 300∘C . These response values were 1.3-2.7 times larger than those of bare β-Bi₂O₃ nanorod sensors at 1-5 ppm NO₂ . The enhancement in the response of β-Bi₂O₃ nanorods to NO₂ gas by the encapsulation by In₂O₃ can be accounted for based on the space-charge model.
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Park et al. (2012) studied this question.
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