Synthesis of Nanosized Zinc-Doped Cobalt Oxyhydroxide Parties by a Dropping Method and Their Carbon Monoxide Gas Sensing Properties : Figure 3

(a)

(b)

Figure 3: Morphology of (a) CoOOH precursors and (b) nanosized CoOOH prepared by hydrothermal treatment at 40°C for 6 h.