Structure and Gas-sensitive Properties of ZnO-Bi2O3 Mixed Thick Films

Abstract

Abstract: Needle-shaped ZnO and ellipsoid-shaped Bi₂O₃ nanoparticles, as raw materials of thick films, were prepared by metallic vapour oxidation, and the obtained Bi₂O₃ is a mixture of δ and β phases.
The phase structure and surface morphology of the thick films based on ZnO, Bi₂O₃ and ZnO-Bi₂O₃ mixture were investigated by XRD and SEM, then the resistance and gas sensitivity of the thick films
were measured. The results indicate that Bi₂O₃ films show P-type conductivity and have sensitivity to alcohol and acetone more or less. Compared with ZnO, the sensitivity of ZnO-Bi₂O₃ to benzene,
toluene and xylene is lower, which is relative with the increase of granular sizes and barrier height located at grain boundaries of the thick films. But Bi₂O₃, maybe as a very low activity catalyst,
improves the gas sensitivity of the thick films to alcohol and acetone.

Key words: ZnO, Bi₂O₃, nanoparticles, conductivity, gas-sensitivity

CLC Number:

TB383
TN304

ZHU Bai-Lin,XIE Chang-Sheng,ZENG Da-Wen,WANG Ai-Hua,SONG Wu-Lin. Structure and Gas-sensitive Properties of ZnO-Bi₂O₃ Mixed Thick Films[J]. Journal of Inorganic Materials.

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Structure and Gas-sensitive Properties of ZnO-Bi₂O₃ Mixed Thick Films

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