Enhanced room temperature NO2 response of NiO-SnO2 nanocomposites induced by interface bonds at the p-n heterojunction

Physical Chemistry Chemical Physics : PCCP
Jian ZhangChangsheng Xie

Abstract

Recently, heterostructured nanomaterials have attracted great attention in gas sensing applications. However, the sensing mechanism of the enhanced sensitivity of heterostructured nanomaterials remains unclear, which is not conducive to further improvements in their sensing performances. In order to detail the fundamental studies on the gas sensing mechanism of heterostructured nanomaterials and improve the room temperature NO2 sensing properties of NiO-based nanomaterials, NiO-SnO2 heterojunction nanocomposites were fabricated. It was found that the sensitivity of the nanocomposites was largely enhanced compared to the bare NiO. On the basis of the intrinsic characteristics of the p-n heterojunction and the band structure of the NiO-SnO2 heterojunction, the largely enhanced room temperature NO2 response of the nanocomposites could be attributed to two factors. One was the significantly decreased initial conductance, and the increase in the equivalent hole concentration of the nanocomposites after exposure to NO2, associated with the effective electron transfer via the interface bonds at the heterojunction. Another was that the variation of contact potential in the nanocomposites, before and after exposure to NO2, exerted a dra...Continue Reading

References

Oct 13, 2010·ACS Applied Materials & Interfaces·Zhenyi ZhangYichun Liu
Jul 9, 2011·Chemistry : a European Journal·Duc Hoa Nguyen, Sherif A El-Safty
Oct 3, 2012·ACS Applied Materials & Interfaces·Baochang WangRajeev Ahuja
May 9, 2015·ACS Applied Materials & Interfaces·Keng XuChangsheng Xie

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