Effects of calcination temperature on triethylamine gas-sensing performance of NiFe2O4 nanotubes

A facile electrospinning method was utilized to fabricate nickel ferrite (NiFe 2 O 4 ) nanotubes at different calcination temperatures (550 ℃, 600 ℃, 650 ℃, and 700 ℃). The structure of the nanotubes was characterized and analyzed using XRD, FE-SEM, and TEM. The results indicate that the surface of the NiFe 2 O 4 nanotubes gradually became rougher with increasing calcination temperature. When the calcination temperature reached 600 ℃, the NiFe 2 O 4 nanotubes exhibited the highest gas-sensing performance (R g /R a  = 16.1) toward 100 ppm triethylamine (TEA) at the operating temperature of 125 °C. Compared to other tested gases, the NiFe 2 O 4 nanotubes demonstrated significant selectivity for triethylamine. Furthermore, the influence of calcination temperature on the sensing performance of the NiFe 2 O 4 nanotubes was investigated.