The results showed that the gas sensor based CuO/SnO2 doped by CNTs (CNTs-CuO/SnO2) has a low optimum operating temperature, 40 °C, good behavior in detecting low concentration H2S, short response and recovery time (8.3 and 11.5 s, respectively).  And at the same time, compared with other gases, 3 wt% CNTs-CuO/SnO2 composite nanomaterial had excellent selectivity to H2S at low concentrations. 
CNTs-CuO/SnO2
The results showed that the gas sensor based CuO/SnO2 doped by CNTs (CNTs-CuO/SnO2) has a low optimum operating temperature, 40 °C, good behavior in detecting low concentration H2S, short response and recovery time (8.3 and 11.5 s, respectively).  And at the same time, compared with other gases, 3 wt% CNTs-CuO/SnO2 composite nanomaterial had excellent selectivity to H2S at low concentrations. 
CNTs-CuO/SnO2
The results showed that the gas sensor based CuO/SnO2 doped by CNTs (CNTs-CuO/SnO2) has a low optimum operating temperature, 40 °C, good behavior in detecting low concentration H2S, short response and recovery time (8.3 and 11.5 s, respectively).  And at the same time, compared with other gases, 3 wt% CNTs-CuO/SnO2 composite nanomaterial had excellent selectivity to H2S at low concentrations. 
CNTs-CuO/SnO2
The results showed that the gas sensor based CuO/SnO2 doped by CNTs (CNTs-CuO/SnO2) has a low optimum operating temperature, 40 °C, good behavior in detecting low concentration H2S, short response and recovery time (8.3 and 11.5 s, respectively).  And at the same time, compared with other gases, 3 wt% CNTs-CuO/SnO2 composite nanomaterial had excellent selectivity to H2S at low concentrations. 
CNTs-CuO/SnO2
The results showed that the gas sensor based CuO/SnO2 doped by CNTs (CNTs-CuO/SnO2) has a low optimum operating temperature, 40 °C, good behavior in detecting low concentration H2S, short response and recovery time (8.3 and 11.5 s, respectively).  And at the same time, compared with other gases, 3 wt% CNTs-CuO/SnO2 composite nanomaterial had excellent selectivity to H2S at low concentrations. 
CNTs-CuO/SnO2