Enhanced Gas Sensing of p-Type Co₃O₄ Nanoflowers by n-Type ZnO Nanowires

The
${p}$
-type amorphous structure Co
₃
O
₄
nanoflowers are synthesized on
${n}$
-type single crystal ZnO nanowires/glass substrate by chemical bath deposition. The humidity sensing of
p-n
nanocomposite was exhibited the
${p}$
-type characteristics in the lower 50% RH, and revealed n-type property when RH is higher 50% RH. The
p-n
nanocomposite sensor was revealed good sensing ability for various organic solvents gas. Among them, ethanol is the most sensitive.