Research Article

Hydrothermal Synthesis of Pt-, Fe-, and Zn-doped Nanospheres and Carbon Monoxide Sensing Properties

Figure 3

FESEM images of (a) pure, (b) Pt-, (c) Fe-, and (d) Zn-doped SnO2 nanospheres.
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(a)
578460.fig.003b
(b)
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(c)
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(d)