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A porous structure of the nanotubes, the conversion between Ce 3+ and Ce 4+ , and an n–p heterojunction between n-CeO 2 /p-ZnCo 2 O 4 , these are the potential reasons to the improvement in gas sensing performance of CeO 2 /ZnCo 2 O 4 nanotubes.
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Alali et al. (2016) studied this question.
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