“…Alcohol sensors with unique performance have numerous practical applications in the areas of wine quality monitoring, breath analysis, and the food and biomedical industries [13,14]. Semiconducting metal oxides, including SnO 2 nanofibers [15], branched SnO 2 nanowires [16], indium-doped SnO 2 nanowires [17], ZnO nanorods [18], porous ZnO nanoplates [19], ZnO nanotubes [20], TiO 2 nanoparticles [21], porous α-Fe 2 O 3 nanorods [22], α-Cr 2 O 3 nanotubes [23], porous ZnFe 2 O 4 nanorods [24], CdIn 2 O 4 nanocrystals [25], V 2 O 5 nanobelts [14], V 2 O 5 macroscopic fibers [26], SnO 2 /NASICON-type composites [27] and α-Fe 2 O 3 /SnO 2 core-shell nanorods [28], have been reported as efficient active elements for alcohol-detection applications. However, there are also some problems needing to be solved.…”