Excellent ethanol sensing properties based on Er
2
O
3
-Fe
2
O
3
nanotubes
*
Liu Chang-Bai
a)
, He Ying
b)
, Wang Sheng-Lei
a)
Responses of Er
2
O
3
-Fe
2
O
3
nanotube sensors to 5 and 10 ppm ethanol every ten days at 240 °C.