Facile synthesis of tortoise shell-like porous NiCo_2O_4 nanoplate with promising triethylamine gas sensing properties

摘要

Tortoise Shell-Like Porous NiCo_2O_4 nanoplates were synthesized and applied as sensing material to detect tri-methylamine. Spinel structure porous NiCo_2O_4 can be obtained by calcination at 500°C and showed best gas sensing properties of all as-prepared samples. The high specific surface area (102.6 m~2g~(-1)) provided sufficient active sites for gas sensing and the nature of the compound assured the high response of 2.58 at low operating temperature of 220°C to 10 ppm TEA. The increase of Ni (Ⅱ)/Ni (Ⅲ) ratio from 0.25 for fresh NiCo_2O_4-500 to 0.32 for TEA treated NiCo_2O_4-500 revealed that the gas sensing reaction occurred on the Ni site. This work provides an alternative approach for the production of porous functional materials and a new insight of the gas sensing mechanism.