Enhanced Gas Sensing Properties of Bi 2 O 3 -Core/In 2 O 3 -Shell Nanorod Gas Sensors

The nanowires are highly sensitive to low concentrations of 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 nanorods with on the gas sensing properties. nanorods were fabricated by a two-step process comprising the thermal evaporation of powders and sputter-deposition of . Multiple networked nanorod sensors showed the responses of 12-156% at 1-5 ppm at . These response values were 1.3-2.7 times larger than those of bare nanorod sensors at 1-5 ppm . The enhancement in the response of nanorods to gas by the encapsulation by can be accounted for based on the space-charge model.

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