In this paper, a kind of indirect-heating formaldehyde gas sensor based on SnO_2 is introduced, and we try to improve the performance of this gas sensor, such as sensitivity, selectivity and so on.
The fabricating processes of SnO_2 gas sensors without and with different dopants were described in this paper. Their basic gas sensing characteristics were tested. The sensitivity reached its max value when heating voltage was 4V for the undoped SnO_2 gas sensor, but it decreased to 3.5V for some dope...