Preparation of Flower-Like Cu-WO₃ Nanostructures and Their Acetone Gas Sensing Performance

Figure 2

SEM images of Cu-doped tungsten oxide samples calcined at different temperatures. (a) SEM image of urchin-like Cu-doped W₁₈O₄₉ at 300°C. (b) SEM image of flower-like Cu-doped WO₃ at 600°C. (c) High-magnification image of (b). (d) TEM image of flower-like Cu-doped WO₃ at 600°C. (e) High-resolution TEM (HRTEM) image of the flower-like sample. (f) Selected area electron diffraction (SAED) pattern of the sample in (e).

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