. 2017 May 3;17(5):1011. doi: 10.3390/s17051011

Table 1.

List of samples with their corresponding doping methods and precipitation agents employed.

Name of the Sample	Doping Method	Precipitation Agent	Dopant
Cu:SnO₂_U_Chem	Chemical doping	Urea	Cu
Cu:SnO₂_A_Chem	Chemical doping	Ammonia
Cu:SnO₂_U_Impe	Impregnation	Urea
Cu:SnO₂_A_Impe	Impregnation	Ammonia
Pt:SnO₂_U_Chem	Chemical doping	Urea	Pt
Pt:SnO₂_A_Chem	Chemical doping	Ammonia
Pt:SnO₂_U_Impe	Impregnation	Urea
Pt:SnO₂_A_Impe	Impregnation	Ammonia
Pd:SnO₂_U_Chem	Chemical doping	Urea	Pd
Pd:SnO₂_A_Chem	Chemical doping	Ammonia
Pd:SnO₂_U_Impe	Impregnation	Urea
Pd:SnO₂_A_Impe	Impregnation	Ammonia